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Thursday, November 18, 2021

Conservation movement

From Wikipedia, the free encyclopedia
 
The conservation movement, also known as nature conservation, is a political, environmental, and social movement that seeks to manage and protect natural resources, including animal, fungus, and plant species as well as their habitat for the future. Conservationists are concerned with leaving the environment in a better state than the condition they found it in. Evidence-based conservation seeks to use high quality scientific evidence to make conservation efforts more effective.

The early conservation movement evolved out of necessity to maintain natural resources such as fisheries, wildlife management, water, soil, as well as conservation and sustainable forestry. The contemporary conservation movement has broadened from the early movement's emphasis on use of sustainable yield of natural resources and preservation of wilderness areas to include preservation of biodiversity. Some say the conservation movement is part of the broader and more far-reaching environmental movement, while others argue that they differ both in ideology and practice. Chiefly in the United States, conservation is seen as differing from environmentalism and it is generally a conservative school of thought which aims to preserve natural resources expressly for their continued sustainable use by humans. Outside the U.S., the term conservation more broadly includes environmentalism.

History

Early history

Sylva, or A Discourse of Forest-Trees and the Propagation of Timber in His Majesty's Dominions, title page of the first edition (1664).

The conservation movement can be traced back to John Evelyn's work Sylva, presented as a paper to the Royal Society in 1662. Published as a book two years later, it was one of the most highly influential texts on forestry ever published. Timbre resources in England were becoming dangerously depleted at the time, and Evelyn advocated the importance of conserving the forests by managing the rate of depletion and ensuring that the cut down trees get replenished.

The field developed during the 18th century, especially in Prussia and France where scientific forestry methods were developed. These methods were first applied rigorously in British India from the early-19th century. The government was interested in the use of forest produce and began managing the forests with measures to reduce the risk of wildfire in order to protect the "household" of nature, as it was then termed. This early ecological idea was in order to preserve the growth of delicate teak trees, which was an important resource for the Royal Navy. Concerns over teak depletion were raised as early as 1799 and 1805 when the Navy was undergoing a massive expansion during the Napoleonic Wars; this pressure led to the first formal conservation Act, which prohibited the felling of small teak trees. The first forestry officer was appointed in 1806 to regulate and preserve the trees necessary for shipbuilding. This promising start received a setback in the 1820s and 30s, when laissez-faire economics and complaints from private landowners brought these early conservation attempts to an end.

Origins of the modern conservation movement

Conservation was revived in the mid-19th century, with the first practical application of scientific conservation principles to the forests of India. The conservation ethic that began to evolve included three core principles: that human activity damaged the environment, that there was a civic duty to maintain the environment for future generations, and that scientific, empirically based methods should be applied to ensure this duty was carried out. Sir James Ranald Martin was prominent in promoting this ideology, publishing many medico-topographical reports that demonstrated the scale of damage wrought through large-scale deforestation and desiccation, and lobbying extensively for the institutionalization of forest conservation activities in British India through the establishment of Forest Departments. Edward Percy Stebbing warned of desertification of India. The Madras Board of Revenue started local conservation efforts in 1842, headed by Alexander Gibson, a professional botanist who systematically adopted a forest conservation program based on scientific principles. This was the first case of state management of forests in the world.

These local attempts gradually received more attention by the British government as the unregulated felling of trees continued unabated. In 1850, the British Association in Edinburgh formed a committee to study forest destruction at the behest of Dr. Hugh Cleghorn a pioneer in the nascent conservation movement.

He had become interested in forest conservation in Mysore in 1847 and gave several lectures at the Association on the failure of agriculture in India. These lectures influenced the government under Governor-General Lord Dalhousie to introduce the first permanent and large-scale forest conservation program in the world in 1855, a model that soon spread to other colonies, as well the United States. In the same year, Cleghorn organised the Madras Forest Department and in 1860 the Department banned the use shifting cultivation. Cleghorn's 1861 manual, The forests and gardens of South India, became the definitive work on the subject and was widely used by forest assistants in the subcontinent. In 1861, the Forest Department extended its remit into the Punjab.

Schlich, in the middle of the seated row, with students from the forestry school at Oxford, on a visit to the forests of Saxony in the year 1892.

Sir Dietrich Brandis, a German forester, joined the British service in 1856 as superintendent of the teak forests of Pegu division in eastern Burma. During that time Burma's teak forests were controlled by militant Karen tribals. He introduced the "taungya" system, in which Karen villagers provided labor for clearing, planting and weeding teak plantations. After seven years in Burma, Brandis was appointed Inspector General of Forests in India, a position he served in for 20 years. He formulated new forest legislation and helped establish research and training institutions. The Imperial Forest School at Dehradun was founded by him.

Germans were prominent in the forestry administration of British India. As well as Brandis, Berthold Ribbentrop and Sir William P.D. Schlich brought new methods to Indian conservation, the latter becoming the Inspector-General in 1883 after Brandis stepped down. Schlich helped to establish the journal Indian Forester in 1874, and became the founding director of the first forestry school in England at Cooper's Hill in 1885. He authored the five-volume Manual of Forestry (1889–96) on silviculture, forest management, forest protection, and forest utilization, which became the standard and enduring textbook for forestry students.

Conservation in the United States

The American movement received its inspiration from 19th century works that exalted the inherent value of nature, quite apart from human usage. Author Henry David Thoreau (1817-1862) made key philosophical contributions that exalted nature. Thoreau was interested in peoples' relationship with nature and studied this by living close to nature in a simple life. He published his experiences in the book Walden, which argued that people should become intimately close with nature. The ideas of Sir Brandis, Sir William P.D. Schlich and Carl A. Schenck were also very influential - Gifford Pinchot, the first chief of the USDA Forest Service, relied heavily upon Brandis' advice for introducing professional forest management in the U.S. and on how to structure the Forest Service.

Both conservationists and preservationists appeared in political debates during the Progressive Era (the 1890s—early 1920s). There were three main positions.

  • Laissez-faire: The laissez-faire position held that owners of private property—including lumber and mining companies, should be allowed to do anything they wished on their properties.
  • Conservationists: The conservationists, led by future President Theodore Roosevelt and his close ally George Bird Grinnell, were motivated by the wanton waste that was taking place at the hand of market forces, including logging and hunting. This practice resulted in placing a large number of North American game species on the edge of extinction. Roosevelt recognized that the laissez-faire approach of the U.S. Government was too wasteful and inefficient. In any case, they noted, most of the natural resources in the western states were already owned by the federal government. The best course of action, they argued, was a long-term plan devised by national experts to maximize the long-term economic benefits of natural resources. To accomplish the mission, Roosevelt and Grinnell formed the Boone and Crockett Club, whose members were some of the best minds and influential men of the day. Its contingency of conservationists, scientists, politicians, and intellectuals became Roosevelt's closest advisers during his march to preserve wildlife and habitat across North America.
  • Preservationists: Preservationists, led by John Muir (1838–1914), argued that the conservation policies were not strong enough to protect the interest of the natural world because they continued to focus on the natural world as a source of economic production.

The debate between conservation and preservation reached its peak in the public debates over the construction of California's Hetch Hetchy dam in Yosemite National Park which supplies the water supply of San Francisco. Muir, leading the Sierra Club, declared that the valley must be preserved for the sake of its beauty: "No holier temple has ever been consecrated by the heart of man."

President Roosevelt put conservationist issues high on the national agenda. He worked with all the major figures of the movement, especially his chief advisor on the matter, Gifford Pinchot and was deeply committed to conserving natural resources. He encouraged the Newlands Reclamation Act of 1902 to promote federal construction of dams to irrigate small farms and placed 230 million acres (360,000 mi2 or 930,000 km2) under federal protection. Roosevelt set aside more federal land for national parks and nature preserves than all of his predecessors combined.

Roosevelt was a leader in conservation, fighting to end the waste of natural resources

Roosevelt established the United States Forest Service, signed into law the creation of five national parks, and signed the year 1906 Antiquities Act, under which he proclaimed 18 new national monuments. He also established the first 51 bird reserves, four game preserves, and 150 national forests, including Shoshone National Forest, the nation's first. The area of the United States that he placed under public protection totals approximately 230,000,000 acres (930,000 km2).

Gifford Pinchot had been appointed by McKinley as chief of Division of Forestry in the Department of Agriculture. In 1905, his department gained control of the national forest reserves. Pinchot promoted private use (for a fee) under federal supervision. In 1907, Roosevelt designated 16 million acres (65,000 km2) of new national forests just minutes before a deadline.

In May 1908, Roosevelt sponsored the Conference of Governors held in the White House, with a focus on natural resources and their most efficient use. Roosevelt delivered the opening address: "Conservation as a National Duty".

In 1903 Roosevelt toured the Yosemite Valley with John Muir, who had a very different view of conservation, and tried to minimize commercial use of water resources and forests. Working through the Sierra Club he founded, Muir succeeded in 1905 in having Congress transfer the Mariposa Grove and Yosemite Valley to the federal government. While Muir wanted nature preserved for its own sake, Roosevelt subscribed to Pinchot's formulation, "to make the forest produce the largest amount of whatever crop or service will be most useful, and keep on producing it for generation after generation of men and trees."

Theodore Roosevelt's view on conservationism remained dominant for decades; - Franklin D. Roosevelt authorised the building of many large-scale dams and water projects, as well as the expansion of the National Forest System to buy out sub-marginal farms. In 1937, the Pittman–Robertson Federal Aid in Wildlife Restoration Act was signed into law, providing funding for state agencies to carry out their conservation efforts.

Since 1970

Environmental reemerged on the national agenda in 1970, with Republican Richard Nixon playing a major role, especially with his creation of the Environmental Protection Agency. The debates over the public lands and environmental politics played a supporting role in the decline of liberalism and the rise of modern environmentalism. Although Americans consistently rank environmental issues as "important", polling data indicates that in the voting booth voters rank the environmental issues low relative to other political concerns.

The growth of the Republican party's political power in the inland West (apart from the Pacific coast) was facilitated by the rise of popular opposition to public lands reform. Successful Democrats in the inland West and Alaska typically take more conservative positions on environmental issues than Democrats from the Coastal states. Conservatives drew on new organizational networks of think tanks, industry groups, and citizen-oriented organizations, and they began to deploy new strategies that affirmed the rights of individuals to their property, protection of extraction rights, to hunt and recreate, and to pursue happiness unencumbered by the federal government at the expense of resource conservation.

In 2019, convivial conservation was an idea proposed by Bram Büscher and Robert Fletcher. Convivial conservation draws on social movements and concepts like environmental justice and structural change to create a post-capitalist approach to conservation.

Conservation in Costa Rica

Figure 1. Costa Rica divided into different areas of conservation

Although the conservation movement developed in Europe in the 18th century, Costa Rica as a country has been heralded its champion in the current times. Costa Rica hosts an astonishing number of species, given its size, having more animal and plant species than the US and Canada combined while being only 250 miles long and 150 miles wide. A widely accepted theory for the origin of this unusual density of species is the free mixing of species from both North and South America occurring on this "inter-oceanic" and "inter-continental" landscape. Preserving the natural environment of this fragile landscape, therefore, has drawn the attention of many international scholars.

Costa Rica has made conservation a national priority, and has been at the forefront of preserving its natural environment with over a quarter of its land designated as protected in some form, which is under the administrative control of SINAC (National System of Conservation Areas)  a division of MINAE (Ministry of Environment, Energy and Telecommunications). SINAC has subdivided the country into various zones depending on the ecological diversity of that region - these zones are depicted in figure 1.

The country has used this ecological diversity to its economic advantage in the form of a thriving ecotourism industry, putting its commitment to nature, on display to visitors from across the globe. It is estimated that a record 2.6 million foreigners visited the country in 2015, almost half the population of Costa Rica itself. This tourism is facilitated by the fact that Costa Rica has a stable democracy and has a human development index of 0.776, the highest for any country in Latin America.

It is also the only country in the world that generates more than 99% of its electricity from renewable sources, relying on hydropower (78%), wind (10%), geothermal energy (10%), biomass and solar (1%). Critics have pointed out however, that in achieving this milestone, the country has built several dams (providing the bulk of its electricity) some of which have negatively impacted indigenous communities as well as the local flora and fauna.

World Wide Fund for Nature

You know, when we first set up WWF, our objective was to save endangered species from extinction. But we have failed completely; we haven’t managed to save a single one. If only we had put all that money into condoms, we might have done some good.

— Sir Peter Scott, Founder of the World Wide Fund for Nature, Cosmos Magazine, 2010

The World Wide Fund for Nature (WWF) is an international non-governmental organization founded in 1961, working in the field of the wilderness preservation, and the reduction of human impact on the environment. It was formerly named the "World Wildlife Fund", which remains its official name in Canada and the United States.

WWF is the world's largest conservation organization with over five million supporters worldwide, working in more than 100 countries, supporting around 1,300 conservation and environmental projects. They have invested over $1 billion in more than 12,000 conservation initiatives since 1995. WWF is a foundation with 55% of funding from individuals and bequests, 19% from government sources (such as the World Bank, DFID, USAID) and 8% from corporations in 2014.

WWF aims to "stop the degradation of the planet's natural environment and to build a future in which humans live in harmony with nature." The Living Planet Report is published every two years by WWF since 1998; it is based on a Living Planet Index and ecological footprint calculation. In addition, WWF has launched several notable worldwide campaigns including Earth Hour and Debt-for-Nature Swap, and its current work is organized around these six areas: food, climate, freshwater, wildlife, forests, and oceans.

"Conservation Far" Approach

A conservation-exploitation dichotomy has plagued a place many may not expect: Conservation institutions. Institutions such as the Worldwide Wildlife Fund (WWF) have historically been the cause of the displacement and divide between native populations and the land’s they love and inhabit. The overbearing reason behind this rather contradictory truth is because of the organization’s historically colonial, patronistic, and neoliberal approaches to conservation. Claus in his article, "Drawing the Sea Near: Satoumi and Coral Reef Conservation in Okinawa" expands on these approaches and their effectiveness, not as much in conservation, but in creating the value of and commercializing endangered flora and fauna. One way in which this has taken place is through a separation between people, even locals, and the nature spaces they aimed to protect. This is what Claus calls the “Conservation-Far'' method, in which access to lands is completely relinquished upon the locals and tourists, by an external, foreign entity. This entity is largely unaware of the customs and values held by those within the territory surrounding nature and their role within it.

Claus relays the history of an Island in Japan, Shiraho, in which the people’s traditional ways of tending to nature were lost due to modernization and the rise of a fast-paced lifestyle. It is the view of a “Conservation-Near'' approach that would suggest a regeneration of these customs within the local area. This engages those near in proximity to the lands in the conservation efforts and holds them accountable for their direct effects on it’s preservation. Unlike the hands-on, full sensory experience permitted by conservation-near methodologies, conservation-far drills visuals and sight as being the main interaction medium between people and the environment. An emphasis on observation only stems from a deeper association with intellect and observation. The alternative to this is more of a bodily or “primitive” consciousness which is associated with lower-intelligence and people of color. A new, integrated approach to conservation is being investigated in recent years by institutions such as WWF.

Evidence-based conservation

Areas of concern

A conservation area's sign in the Finnish forest. It says, "A conservation area protected by law".

Deforestation and overpopulation are issues affecting all regions of the world. The consequent destruction of wildlife habitat has prompted the creation of conservation groups in other countries, some founded by local hunters who have witnessed declining wildlife populations first hand. Also, it was highly important for the conservation movement to solve problems of living conditions in the cities and the overpopulation of such places.

Boreal forest and the Arctic

The idea of incentive conservation is a modern one but its practice has clearly defended some of the sub Arctic wildernesses and the wildlife in those regions for thousands of years, especially by indigenous peoples such as the Evenk, Yakut, Sami, Inuit and Cree. The fur trade and hunting by these peoples have preserved these regions for thousands of years. Ironically, the pressure now upon them comes from non-renewable resources such as oil, sometimes to make synthetic clothing which is advocated as a humane substitute for fur. (See Raccoon dog for case study of the conservation of an animal through fur trade.) Similarly, in the case of the beaver, hunting and fur trade were thought to bring about the animal's demise, when in fact they were an integral part of its conservation. For many years children's books stated and still do, that the decline in the beaver population was due to the fur trade. In reality however, the decline in beaver numbers was because of habitat destruction and deforestation, as well as its continued persecution as a pest (it causes flooding). In Cree lands however, where the population valued the animal for meat and fur, it continued to thrive. The Inuit defend their relationship with the seal in response to outside critics.

Latin America (Bolivia)

The Izoceño-Guaraní of Santa Cruz Department, Bolivia is a tribe of hunters who were influential in establishing the Capitania del Alto y Bajo Isoso (CABI). CABI promotes economic growth and survival of the Izoceno people while discouraging the rapid destruction of habitat within Bolivia's Gran Chaco. They are responsible for the creation of the 34,000 square kilometre Kaa-Iya del Gran Chaco National Park and Integrated Management Area (KINP). The KINP protects the most biodiverse portion of the Gran Chaco, an ecoregion shared with Argentina, Paraguay and Brazil. In 1996, the Wildlife Conservation Society joined forces with CABI to institute wildlife and hunting monitoring programs in 23 Izoceño communities. The partnership combines traditional beliefs and local knowledge with the political and administrative tools needed to effectively manage habitats. The programs rely solely on voluntary participation by local hunters who perform self-monitoring techniques and keep records of their hunts. The information obtained by the hunters participating in the program has provided CABI with important data required to make educated decisions about the use of the land. Hunters have been willing participants in this program because of pride in their traditional activities, encouragement by their communities and expectations of benefits to the area.

Africa (Botswana)

In order to discourage illegal South African hunting parties and ensure future local use and sustainability, indigenous hunters in Botswana began lobbying for and implementing conservation practices in the 1960s. The Fauna Preservation Society of Ngamiland (FPS) was formed in 1962 by the husband and wife team: Robert Kay and June Kay, environmentalists working in conjunction with the Batawana tribes to preserve wildlife habitat.

The FPS promotes habitat conservation and provides local education for preservation of wildlife. Conservation initiatives were met with strong opposition from the Botswana government because of the monies tied to big-game hunting. In the 1963, BaTawanga Chiefs and tribal hunter/adventurers in conjunction with the FPS founded Moremi National Park and Wildlife Refuge, the first area to be set aside by tribal people rather than governmental forces. Moremi National Park is home to a variety of wildlife, including lions, giraffes, elephants, buffalo, zebra, cheetahs and antelope, and covers an area of 3,000 square kilometers. Most of the groups involved with establishing this protected land were involved with hunting and were motivated by their personal observations of declining wildlife and habitat.

Ethnobiology

From Wikipedia, the free encyclopedia
 

Ethnobiology is the scientific study of the way living things are treated or used by different human cultures. It studies the dynamic relationships between people, biota, and environments, from the distant past to the immediate present.

"People-biota-environment" interactions around the world are documented and studied through time, across cultures, and across disciplines in a search for valid, reliable answers to two 'defining' questions: "How and in what ways do human societies use nature, and how and in what ways do human societies view nature?"

History

Beginnings (15th century–19th century)

The WrightMolyneux map of the world, showing the extent of English geographic knowledge c. 1600

Biologists have been interested in local biological knowledge since the time Europeans started colonising the world, from the 15th century onwards. Paul Sillitoe wrote that:

Europeans not only sought to understand the new regions they intruded into but also were on the look-out for resources that they might profitably exploit, engaging in practices that today we should consider tantamount to biopiracy. Many new crops .. entered into Europe during this period, such as the potato, tomato, pumpkin, maize, and tobacco. (Page 121)

Local biological knowledge, collected and sampled over these early centuries significantly informed the early development of modern biology:

Phase I (1900s–1940s)

Ethnobiology itself, as a distinctive practice, only emerged during the 20th century as part of the records then being made about other peoples, and other cultures. As a practice, it was nearly always ancillary to other pursuits when documenting others' languages, folklore, and natural resource use. Roy Ellen commented that:

At its earliest and most rudimentary, this comprised listing the names and uses of plants and animals in native non-Western or 'traditional' populations often in the context of salvage ethnography ..[ie] ethno-biology as the descriptive biological knowledge of 'primitive' peoples.

This 'first phase' in the development of ethnobiology as a practice has been described as still having an essentially utilitarian purpose, often focusing on identifying those 'native' plants, animals and technologies of some potential use and value within increasingly dominant western economic systems

Phase II (1950s–1970s)

Arising out of practices in Phase I (above) came a 'second phase' in the development of 'ethnobiology', with researchers now striving to better document and better understand how other peoples' themselves "conceptualize and categorize" the natural world around them. In Sillitoe's words:

By the mid-20th century .. utilitarian-focussed studies started to give way to more cognitively framed ones, notably studies that centred on elucidating classificatory schemes. (Page 122)

Some Mangyan (who count the Hanunóo among their members) men, on Mindoro island, Philippines, where Harold Conklin did his ethnobiological work

This 'second' phase is marked:

Present (1980s–2000s)

By the turn of the 21st century ethnobiological practices, research, and findings have had a significant impact and influence across a number of fields of biological inquiry including ecology, conservation biology, development studies, and political ecology.

The Society of Ethnobiology advises on its web page:

Ethnobiology is a rapidly growing field of research, gaining professional, student, and public interest .. internationally

Ethnobiology has come out from its place as an ancillary practice in the shadows of other core pursuits, to arise as a whole field of inquiry and research in its own right: taught within many tertiary institutions and educational programs around the world; with its own methods manuals, its own readers, and its own textbooks.

Subjects of inquiry

Usage

All societies make use of the biological world in which they are situated, but there are wide differences in use, informed by perceived need, available technology, and the culture's sense of morality and sustainability.[citation needed] Ethnobiologists investigate what lifeforms are used for what purposes, the particular techniques of use, the reasons for these choices, and symbolic and spiritual implications of them.

Taxonomy

Different societies divide the living world up in different ways. Ethnobiologists attempt to record the words used in particular cultures for living things, from the most specific terms (analogous to species names in Linnean biology) to more general terms (such as 'tree' and even more generally 'plant'). They also try to understand the overall structure or hierarchy of the classification system (if there is one; there is ongoing debate as to whether there must always be an implied hierarchy.

Cosmological, moral and spiritual significance

Societies invest themselves and their world with meaning partly through their answers to questions like "how did the world happen?", "how and why did people come to be?", "what are proper practices, and why?", and "what realities exist beyond or behind our physical experience?" Understanding these elements of a societies' perspective is important to cultural research in general, and ethnobiologists investigate how a societies' view of the natural world informs and is informed by them.

Traditional ecological knowledge

In order to live effectively in a given place, a people needs to understand the particulars of their environment, and many traditional societies have complex and subtle understandings of the places in which they live. Ethnobiologists seek to share in these understandings, subject to ethical concerns regarding intellectual property and cultural appropriation.

Cross-cultural ethnobiology

In cross cultural ethnobiology research, two or more communities participate simultaneously. This enables the researcher to compare how a bio-resource is used by different communities.

Subdisciplines

Ethnobotany

Ethnobotany investigates the relationship between human societies and plants: how humans use plants – as food, technology, medicine, and in ritual contexts; how they view and understand them; and their symbolic and spiritual role in a culture.

Ethnozoology

The subfield ethnozoology focuses on the relationship between animals and humans throughout human history. It studies human practices such as hunting, fishing and animal husbandry in space and time, and human perspectives about animals such as their place in the moral and spiritual realms.

Ethnoecology

Ethnoecology refers to an increasingly dominant 'ethnobiological' research paradigm focused, primarily, on documenting, describing, and understanding how other peoples perceive, manage, and use whole ecosystems.

Other disciplines

Studies and writings within ethnobiology draw upon research from fields including archaeology, geography, linguistics, systematics, population biology, ecology, cultural anthropology, ethnography, pharmacology, nutrition, conservation, and sustainable development.

Ethics

Through much of the history of ethnobiology, its practitioners were primarily from dominant cultures, and the benefit of their work often accrued to the dominant culture, with little control or benefit invested in the indigenous peoples whose practice and knowledge they recorded.

Just as many of those indigenous societies work to assert legitimate control over physical resources such as traditional lands or artistic and ritual objects, many work to assert legitimate control over their intellectual property.

In an age when the potential exists for large profits from the discovery of, for example, new food crops or medicinal plants, modern ethnobiologists must consider intellectual property rights, the need for informed consent, the potential for harm to informants, and their "debt to the societies in which they work".

Furthermore, these questions must be considered not only in light of western industrialized nations' common understanding of ethics and law, but also in light of the ethical and legal standards of the societies from which the ethnobiologist draws information.

 

Animal psychopathology

From Wikipedia, the free encyclopedia

Animal psychopathology is the study of mental or behavioral disorders in animals.

Historically, there has been an anthropocentric tendency to emphasize the study of animal psychopathologies as models for human mental illnesses. But animal psychopathologies can, from an evolutionary point of view, be more properly regarded as non-adaptive behaviors due to some sort of a cognitive disability, emotional impairment or distress. This article provides a non-exhaustive list of animal psychopathologies.

Eating disorders

Animals in the wild appear to be relatively free from eating disorders although their body composition fluctuates depending on seasonal and reproductive cycles. However, domesticated animals including farm, laboratory, and pet animals are prone to disorders. Evolutionary fitness drives feeding behavior in wild animals. The expectation is that farm animals also display this behavior, but questions arise if the same principles apply to laboratory and pet animals.

Activity anorexia

Activity anorexia (AA) is a condition where rats begin to exercise excessively while simultaneously cutting down on their food intake, similar to human anorexia nervosa or hypergymnasia. When given free access to food and an exercise wheel, rats normally develop a balanced routine between exercise and food intake, which turns them into fit rats. However, if food intake is restricted and wheel access is unrestricted, rats begin to exercise more and eat less, resulting in excessive weight loss and, ultimately, death. The running cycles shift so that most of the running is done in hours before feeding is scheduled. In other conditions, AA does not develop. Unrestricted food access and restricted wheel access will not cause any significant change in either feeding or exercise routine. Also, if rats are restricted both in food intake and wheel access, they will adjust accordingly. In fact, if rats are first trained to the feeding schedule and then given unrestricted access to a running wheel, they will not develop AA behavior. Results support the notion that the running interferes with adaptation to the new feeding schedule and is associated with the reward system in the brain. One theory is that running simulates foraging, a natural behavior in wild rats. Laboratory rats therefore run (forage) more in response to food shortages. The effect of semi-starvation on activity has also been studied in primates. Rhesus macaque males become hyperactive in response to long-term chronic food restriction.

Thin sow syndrome

Thin sow syndrome (TSS) is a behavior observed in stalled sows that is similar to AA where some sows after early pregnancy are extremely active, eat little, and waste away, resulting very often in death. They suffer from emaciation, hypothermia, a depraved appetite, restlessness, and hyperactivity. The syndrome may mainly be related to social and environmental stressors. Stress in stalled sows is often perceived as the consequence of the restraint of animals that happens in intensive production units. The sows that suffer the most restraining conditions are those lactating or pregnant as they have very little room to move around because they are kept in barred gestation crates or tethered for the 16 weeks of pregnancy which prevents natural and social behaviors. However, increased movement and freedom is also stressful for adult sows, which is usually the case after weaning. When placed into groups they fight vigorously, with one dominant sow emerging that eats voraciously. It is also likely that two subordinate sows make up part of the group who actively avoid competitive feeding situations and are bullied by the dominant sow. Affected sows have poor appetite but often show pica, excessive water intake (polydipsia) and are anemic.

Studies on the effects of overcrowding were conducted in the 1940s by placing pregnant Norway rats in a room with plenty of water and food and observing the population growth. The population reached a number of individuals and did not grow thereafter; overcrowding produced stress and psychopathologies. Even though there was plenty of water and food, the rats stopped eating and reproducing.

Similar effects have also been observed in dense populations of beetles. When overcrowding occurs, female beetles destroy their eggs and turn cannibalistic, eating each other. Male beetles lose interest in the females and although there is plenty of water and food, there is no population growth. Similar effects have been observed in overcrowded situations in jack rabbits and deer.

Pica

Pica is the ingestion of non-nutritive substances and has so far been poorly documented. In non-human animals in the laboratory it has been examined through the ingestion of kaolin (a clay mineral) by rats. Rats were induced to intake kaolin by administering various emetic stimuli such as copper sulfate, apomorphine, cisplatin, and motion. Rats are unable to vomit when they ingest a substance that is harmful thus pica in rats is analogous to vomiting in other species; it is a way for rats to relieve digestive distress. In some animals pica seems to be an adaptive trait but in others it seems to be a true psychopathology like in the case of some chickens. Chickens can display a type of pica when they are feed-deprived (feeding restriction has been adopted by the egg industry to induce molting). They increase their non-nutritive pecking, such as pecking structural features of their environment like wood or wire on fences or the feathers of other birds. It is a typical response that occurs when feeding is restricted or is completely withdrawn. Some of the non-nutritive pecking may be due to a redirection of foraging related behavior. Another animal that has displayed a more complex pica example are cattle. Cattle eat bones when they have a phosphorus deficiency. However, in some cases they persist on eating bones even after their phosphorus levels have stabilized and they are getting adequate doses of phosphorus in their diet. In this case evidence supports both a physical and psychological adaptive response. Cattle that continue to eat bones after their phosphorus levels are adequate do it because of a psychological reinforcer. "The persistence of pica in the seeming absence of a physiological cause might be due to the fortuitous acquisition of a conditioned illness during the period of physiological insult."

Cats also display pica behavior in their natural environments and there is evidence to support that this behavior has a psychological aspect to it. Some breeds (such as the Siamese cat) are more predisposed to showing this type of behavior than other breeds, but several types of breeds have been documented to show pica. Cats have been observed to start by chewing and sucking on non-nutritive substances like wool, cotton, rubber, plastic and even cardboard and then progress into ingestion of these substances. This type of behavior occurs through the first four years of a cat's life but it is primarily observed during the first two months of life when cats are introduced into new homes is most common. Theories explaining why this behavior becomes active during this time suggest that early weaning and stress as a consequence of separation from the mother and litter-mates and exposure to a new environment are to blame. Eating wool or other substances may be a soothing mechanism that cats develops to cope with the changes. Pica is also observed predominately during 6–8 months of a cat's life when territorial and sexual behaviors emerge. Pica may be induced by these social stressors. Other theories contemplated include pica as a redirection of prey-catching/ingestion behavior as a result of indoor confinement, especially common among oriental breeds due to risk of theft. In natural environments pica has been observed in parrots (such as macaws) and other birds and mammals. Charles Munn has been studying Amazon macaws lick clay from riverbeds in the Amazon to detoxify the seeds they eat. Amazon macaws spend two to three hours a day licking clay. Munn has found that clay helps counter the tannin and alkaloid in the seeds the macaws ingest, a strategy that is also used by native cultures in the Andes Mountains in Peru.

Pica also affects domesticated animals. While drugs like Prozac are often able to diminish troublesome behaviors in pet dogs, they don't seem to help with this eating disorder. The following story about Bumbley, a wire fox terrier who appeared on 20/20 as a result of his eating disorder, is taken from a book by Dr. Nicholas Dodman:

This dog's presenting problem was light chasing (otherwise known as shadow chasing). It chased shadows for hours on end, even excavating through plasterboard walls to pursue its will-o'-the-wisp illusions ... The one thing that didn't come across clearly in the show was that Bumbley ate everything in sight and the house had to be "Bumbley-proofed" against his relentless ingestion of anything his owners left around ... He had already had surgery to relieve intestinal obstructions resulting from his habit and, each day, his owners reentered their house with trepidation after work, fearing that Bumbley might have eaten something else.

Dodman talks about new research relating bulimia and compulsive overeating to seizural behavior in human patients. He suggests that anti-epileptic medication might be a possible treatment for some cases of pica in animals.

Behavioral disorders

Behavioral disorders are difficult to study in animal models because it is difficult to know what animals are thinking and because animal models used to assess psychopathologies are experimental preparations developed to study a condition. Can a monkey effectively communicate that he is sad or that he feels overwhelmed? Lacking the ability to use language to study behavioral disorders like depression and stress questions the validity of those studies conducted. It can be difficult to attribute human afflictions to non-human animals.

Obsessive compulsive disorder (OCD)

Obsessive-compulsive behavior in animals, often called "stereotypy" or "stereotypical behavior" can be defined as a specific, unnecessary action (or series of actions) repeated more often than would normally be expected. It is unknown whether animals are able to 'obsess' in the same way as humans, and because the motivation for compulsive acts in non-human animals is unknown, the term "abnormal repetitive behavior" is less misleading.

A wide variety of animals exhibit behaviors that can be considered abnormally repetitive.

Ritualized and stereotyped behaviors

Though obsessive-compulsive behaviors are often considered to be pathological or maladaptive, some ritualized and stereotyped behaviors are beneficial. These are usually known as "fixed action patterns". These behaviors sometimes share characteristics with obsessive-compulsive behavior, including a high degree of similarity in form and use among many individuals and a repetitive dimension.

There are many observable animal behaviors with characteristic, highly conserved patterns. One example is grooming behavior in rats. This behavior is defined by a specific sequence of actions that does not normally differ between individual rats. The rat first begins by stroking its whiskers, then expands the stroking motion to include the eyes and the ears, finally moving on to lick both sides of its body. Other behaviors may be added to the end of this chain, but these four actions themselves are fixed. Its ubiquity and high degree of stereotypy suggest that this is a beneficial behavior pattern which has been maintained throughout evolutionary history.

Although humans and animals both have pathological stereotyped behaviors, they do not necessarily provide a similar model of OCD. Feather picking in orange-winged amazon parrots has both a genetic component, with the behavior being more likely in one sibling if the other does it, and more common in parrots close to a door when they were housed in groups. The same study found that feather picking was more common in females and that there was no social transmission of the behavior; neighbors of feather picking birds were only more likely to show the behavior as well if they were related.

An evolutionary basis

Some researchers believe that disadvantageous obsessive compulsive behaviors can be thought of as a normally beneficial process gone too far. Brüne (2006) suggests that change of various origin in striatal and frontal brain circuits, which play a role in predicting needs and threats that may arise in the future, may result in a hyperactive cognitive harm avoidance system, in which a person becomes consciously and unreasonably fearful of an unlikely or impossible event. This may also be true in other animals.

Genetic factors

Canine compulsions are more common in some breeds and behavioral dispositions are often shared within the same litter. This suggests that there is a genetic factor to the disorder. A questionnaire to dog owners and a blood sample of 181 dogs from four breeds, miniature and standard bull terriers, German shepherds, and Staffordshire bull terriers showed these to be more susceptible to compulsive and repetitive behaviors. It is suggested that the more we learn through studying OCD in dogs, the more we can to understand human biology and the genetics involved in the heredity of susceptibility to disorders such as OCD. A chromosome has been located in dogs that confers a high risk of susceptibility to OCD. Canine chromosome 7 has been found to be most significantly associated with obsessive compulsive disorder in dogs, or more specifically, canine compulsive disorder (CCD). This breakthrough helped further relate OCD in humans to CCD in canines. Canine chromosome 7 is expressed in the hippocampus of the brain, the same area that Obsessive Compulsive Disorder is expressed in human patients. Similar pathways are involved in drug treatment responses for both humans and dogs, offering more research that the two creatures exhibit symptoms and respond to treatment in similar ways. This data can help scientists to discover more effective and efficient ways to treat OCD in humans through the information they find by studying CCD in dogs.

Animal models

Animals exhibiting obsessive and compulsive behaviors that resemble OCD in humans have been used as a tool for elucidating possible genetic influences on the disease, potential treatments, and to better understand the pathology of this behavior in general. While such models are useful, they are also limited; it is unclear whether the behavior is ego dystonic in animals. That is, it is difficult to evaluate whether an animal is aware that its behavior is excessive and unreasonable and whether this awareness is a source of anxiety.

One study done by Simon Vermeier used neuroimaging to investigate serotonergic and dopaminergic neurotransmission in 9 dogs with Canine Compulsive Disorder (CCD) to measure the serotonin 2A receptor availability. When compared to the 15 non-compulsive dogs used as a control group, the dogs with CCD were found to have lower receptor availability as well as lower subcortical perfusion and hypothalamic availability. The results of this study provide evidence that there are imbalanced serotonergic and dopaminergic pathways in dogs. Similarities between other studies about human OCD provide construct validity for this study, which suggests that the research will be valid and useful in continuing to investigate brain activity and drug treatment in Obsessive Compulsive Disorder.

Some treatment has been given to dogs with CCD to observe their reactions and how they are similar or different from how humans would react to the same pharmaceutical or behavioral treatment. A combination of the two approaches has been found to be most effective in lowering the intensity and regularity of OCD in both canines and humans. Pharmaceutically, clomipramine was found to be more effective than an alternative chemical, amitriptyline, in treatments for dogs. One study by Karen Overall discovered that by combining behavioral therapy with the more effective clomipramine, the symptoms of Canine Compulsive Disorder decreased by over 50% for all of the dogs involved in the study. Overall acknowledges that OCD is not something that can be completely cured, but studies like this are still important because Obsessive Compulsive Disorder can be controlled effectively enough so it does not interfere with one's life, a valuable and commonly sought after thing for those who suffer from the disorder.

Alicia Graef's article  makes several bold claims that dogs are the future in understanding how to better diagnose, recognize, and treat Obsessive Compulsive Disorder in humans. There is evidence supporting her statements, but the connection between CCD and OCD is not clearly understood. So far, studies have proved that effective treatments in dogs are similarly effective for humans, but there are still so many things unknown. Obsessive Compulsive Disorder is a unique mental disorder that cannot be fully cured. It can be controlled and understood, and one possible way of better doing that might be through studying CCD in canines. Studying dogs that exhibit compulsive behaviors has led scientists to genetic breakthroughs in understanding more how biology and genetics factor into Obsessive Compulsive Disorder. By observing and studying how CCD manifests in the brain activity, behaviors, and genes of diagnosed canines, scientists have been able to use their newfound information to develop better diagnostic tests and more readily recognize symptoms and susceptible humans. The similar brain functions and behaviors of dogs with CCD and humans with OCD suggests they have a connection, not only in behavior and symptoms, but in reacting to treatments. Understanding Canine Compulsive Disorder in dogs has helped scientists to better understand and apply their learning to developing new and more effective ways to treat Obsessive Compulsive Disorder in humans.

Some examples of ways in which rats and mice, two of the most common animal models, have been used to represent human OCD are provided below.

Lever pressing in rats

Certain laboratory rat strains that have been created by controlled breeding for many generations show a higher tendency towards compulsive behaviors than other strains. Lewis rats show more compulsive lever pressing behavior than Sprague Dawley or Wistar rats and are less responsive to the anti-compulsive drug paroxetine. In this study, rats were taught to press a lever to receive food in an operant conditioning task. Once food was no longer provided when they pressed the lever, rats were expected to stop pressing it. Lewis rats pressed the lever more often than the other two types, even though they had presumably learned that they would not receive food, and continued to press it more often even after treatment with the drug. An analysis of the genetic differences between the three rat strains might help to identify genes that might be responsible for the compulsive behavior.

Rats have also been used to test the possibility of a problem with dopamine levels in the brains of animals that exhibit compulsive checking behavior. After treating rats with quinpirole, a chemical that specifically blocks dopamine D2/D3 receptors, compulsive checking of certain locations in an open field increased. Some components of the checking behavior, such as the level of stereotypy in the path animals took to checked locations, the number of checks, and the length of the checks indicated an increase in compulsivity as doses of quinpirole increased; other components, such as the time taken to return from the checked location to the starting point and the time taken to make that trip remained constant after the initial injection throughout the experiment. This means that there might be both an all-or-none and a sensitization aspect in the biology of the dopamine deficiency model of OCD. In addition, quinpirole might reduce a sense of satisfaction in the rats after they check a location, causing them to return to that location again and again.

Estrogen deficiency in male mice

Based on findings of changes in OCD symptoms in menstruating women and differences in the development of the disease between men and women, Hill and colleagues set out to research the effect of estrogen deprivation on the development of compulsive behavior in mice. Male mice with an aromatase gene knockout who were unable to produce estrogen showed excessive grooming and wheel running behaviors, but female mice did not. When treated with 17β-estradiol, which replaced estrogen in these mice, the behaviors disappeared. This study also found that COMT protein levels decreased in mice that did not produce estrogen and increased in the hypothalamus after estrogen-replacement treatment. Briefly, the COMT protein is involved in degrading some neurotransmitters, including dopamine, norepinephrine and epinephrine. This data suggests that there may be a hormonal component and a hormone-gene interaction effect that may contribute to obsessive behaviors.

Pets

Lick granuloma from excessive licking

Dr. Nicholas Dodman describes a wide variety of OCD-like behaviors in his book Dogs Behaving Badly. Such behaviors typically appear when the dog is placed in a stressful situation, including an environment that is not very stimulating, or in dogs with a history of abuse. Different breeds of dog seem to display different compulsions. Lick granuloma, or licking repeatedly until ulcers form on the skin, affects more large dogs, like Labradors, golden retrievers, Great Danes, and Dobermans, while bull terriers, German shepherds, Old English sheepdogs, Rottweilers, and wire-haired fox terriers, and springer spaniels are more likely to snap at imaginary flies or chase light and shadows. These associations probably have an evolutionary basis, although Dodman does not clearly explain that aspect of the behaviors.

Louis Shuster and Nicholas Dodman noticed that dogs often demonstrate obsessive and compulsive behaviors similar to humans. Canine Compulsive Disorder (CCD) is not only specific to certain breeds of dogs, but the breed may affect the specific types of compulsions. For example, bull terriers frequently exhibit obsessively predatory or aggressive behaviors. Breed may factor into the types of compulsions, but some behaviors are more common across the canine spectrum. Most commonly, CCD is seen in canines as they repeat behaviors such as chasing their tails, compulsively chewing on objects, or licking their paws excessively, similar to the common hand-washing compulsion many people with Obsessive Compulsive Disorder have. Hallucinating and attacking the air around their head, as if there were a bug there, is another compulsion that has been seen in some dogs. Circling, hair biting, staring, and sometimes even barking are other examples of behaviors that are considered compulsions in dogs when taken to extreme, repetitive actions.

Treatment (pharmaceutical)

Dodman advocates the use of exercise, an enriched environment (like providing noises for dogs to listen to while owners are at work), and often Prozac (an SSRI used to treat OCD in humans) as treatments.

Shuster and Dodman tested pharmaceutical treatment on canines with CCD to see if it would work as effectively as it does in humans. They used glutamate receptor blockers (memantine) and fluoxetine, commonly known as the antidepressant Prozac, to treat and observe the reactions of 11 dogs with compulsions. Seven of the 11 dogs significantly reduced their compulsions in intensity and frequency after receiving medication.

Dodman includes a story about Hogan, a castrated deaf male Dalmatian, and his compulsive behavior. Hogan had a history of neglect and abuse before he was adopted by Connie and Jim, who attempted to improve his behavior by teaching him to respond to American Sign Language. The following are some excerpts from Hogan's file:

All was well for a year and a half when suddenly, one March morning, he woke up and started pawing everything in sight, and just wouldn't stop. He pawed rugs and blankets, hardwood floors and linoleum, grass and dirt surfaces ... The similarity between what he was doing and prey-seeking behavior was remarkable.

I do believe ... that Hogan was under some kind of psychological pressure at the time the compulsive pawing behavior developed. ... Connie and Jim were compelled to leave him for some eight hours a day while they went to work. ... The pendulum was set and ready to swing. The actual compulsion that develops under such circumstances is less relevant than the fact that one "does" develop.

The "three R's" of rehabilitation are exercise, nutrition, and communication. First, I advised Connie to step up Hogan's exercise to a minimum of thirty minutes of aerobic activity a day. In addition, I advised that Hogan should be fed a low-protein, preservative-free diet. Completing the rehabilitation checklist, I exhorted Connie to work even harder with the sign-language and instructed her on a new sign to use when Hogan started digging. The sign was a piece of card with the letter "H" written on it in thick black pen. Connie was to show Hogan this sign as soon as possible after he engaged in a bout of unwanted pawing and then leave the room. The idea was to let him know that the behavior was not wanted by signaling to him that Connie was about to leave the room. ... Call me a coward, but I didn't think that alone would cut it because of previous experiences with canine compulsive disorders so, employing a belt-and-suspenders strategy, I also advised medicating Hogan with the tricyclic antidepressant Elavil. Theoretically, Elavil wouldn't be that good in obsessive-compulsive behavior but, limited for reasons of expense, and bearing in mind the possible contribution of separation anxiety, Elavil was my best shot.

It took six months before Hogan was over the hump of treatment success. ... At this time Hogan only engaged in occasional pawing of significantly reduced intensity, and the pawing only occurred in moments of stress. Connie reported that stresses particularly likely to induce pawing included being unable to find her and sensing that he was about to be left alone. ... Hogan continued to improve and reached a point at which he was almost pawing-free - but not quite. That seems to be the way with compulsive disorders in man and beast. They can be reduced to the level of permitting affectees to lead relatively normal lives, but there are occasional relapses.

Addiction

Sugar addiction has been examined in laboratory rats and it develops in the same way that drug addiction develops. Eating sugary foods causes the brain to release natural chemicals called opioids and dopamine in the limbic system. Tasty food can activate opioid receptors in the ventral tegmental area and thereby stimulate cells that release dopamine in the nucleus accumbens (NAc). The brain recognizes the intense pleasure derived from the dopamine and opioids release and learns to crave more sugar. Dependence is created through these natural rewards, the sugary treats, and the opioid and dopamine released into the synapses of the mesolimbic system. The hippocampus, the insula and the caudate activate when rats crave sugar, which are the same areas that become active when drug addicts crave the drug. Sugar is good because it provides energy, but if the nervous system goes through a change and the body becomes dependent on the sugar intake, somatic signs of withdrawal begin to appear like chattering teeth, forepaw tremors and head shakes when sugar is not ingested. Morphine tolerance, a measure of addiction, was observed in rats and their tolerance on Morphine was attributed to environmental cues and the systemic effects of the drug. Morphine tolerance does not depend merely on the frequency of pharmacological stimulation, but rather on both the number of pairings of a drug-predictive cue with the systemic effects of the drug. Rats became significantly more tolerant to morphine when they had been exposed to a paired administration than those rats that were not administered a drug-predictive cue along with the morphine.

Depression

Using dogs, Martin Seligman and his colleagues pioneered the study of depression in the animal model of learned helplessness at the University of Pennsylvania. Dogs were separated into three groups, the control group, group A had control over when they were being shocked and group B had no control over when they were being electrocuted. After the shocking condition, the dogs were tested in a shuttle box where they could escape shock by jumping over a partition. To eliminate an interference effect – that the dogs did not learn responses while being shocked that would interfere with their normal escape behavior – the dogs were immobilized using curare, a paralyzing drug while they were being shocked. Both the control group and group A tended to jump over the partition to escape shock while group B dogs did not jump and would passively take the shock. The dogs in group B perceived that the outcome was not related to their efforts. Consequently, a theory emerged that attributed the behavior of the animals to the effects of the shock as a stressor so extreme that it depleted a neurochemical needed by the animals for movement. After the dogs study the effects of helplessness have been tested in species from fish to cats. Most recently learned helplessness has been studied in rhesus macaques using inescapable shock, evoked through stress situations like forced swimming, behavioral despair tasks, tails suspension and pinch induced catalepsy; situations that render the monkey incapable of controlling the environment.

Depression and low mood were found to be of a communicative nature. They signal yielding in a hierarchy conflict or a need for help. Low mood or extreme low mood (also known as depression) can regulate a pattern of engagement and foster disengagement from unattainable goals. "Low mood increases an organism's ability to cope with the adaptive challenges characteristic of unpropitious situations in which effort to pursue a major goal will likely result in danger, loss, bodily damage, or wasted effort." Being apathetic can have a fitness advantage for the organism. Depression has also been studied as a behavioral strategy used by vertebrates to increase their personal or inclusive fitness in the threat of parasites and pathogens.

The lack of neurogenesis has been linked to depression. Animals with stress (isolated, cortisol levels) show a decrease in neurogenesis and antidepressants have been discovered to promote neurogenesis. Rene Hen and his colleagues at Columbia University ran a study on rats in which they blocked neurogenesis by applying radiation to the hippocampal area to test the efficacy of antidepressants. Results suggested that antidepressants failed to work when neurogenesis was inhibited.

Stress

Robert Sapolsky has extensively studied baboons in their natural environment in the Serengeti in Africa. He noticed that baboons have very similar hierarchies in their society as do humans. They spend very few hours searching for food and fulfilling their primary needs, leaving them with time to develop their social network. In primates, mental stresses show up in the body. Primates experience psychological stresses that can elicit physiological responses that, over time, can make them sick. Sapolsky observed the baboons' ranks, personalities and social affiliations, then collected blood samples of the baboons to control the cortisol (stress hormone) levels of the baboons, then matched social position to cortisol levels. Most of the data have been collected from male baboons, because at any given time 80 percent of the females were pregnant. Three factors influenced a baboon's cortisol levels: friendships, perspective, and rank. Baboons had lower levels of cortisol if they 1. played with infants and cultivated friendships, 2. could tell if a situation was a real threat and could tell if they were going to win or lose, and 3. were top ranking.

Cortisol levels rise with age and hippocampal cells express fewer hormone receptors on their surface to protect themselves from excess, making it harder to control stress levels. Cortisol levels are elevated in half of people suffering from major depression, it is the hippocampal region that is affected by both. Stress can have negative effects on gastrointestinal function causing ulcers, and it can also decrease sex drive, affect sleeping patterns and elevate blood pressure but it can also stimulate and motivate. When animals experience stress, they are generally more alert than when they are not stressed. It may help them be better aware of unfamiliar environments and possible threats to their life in these environments. Yerkes and Dodson developed a law that explains the empirical relationship between arousal and performance illustrated by an inverted U-shape graph. According to the Yerkes-Dodson Law, performance increases, as does cognitive arousal, but only to a certain point. The downward part of the U-shape is caused by stress and as stress increases so does efficiency and performance, but only to a certain point. When stress becomes too great, performance and efficiency decline.

Sapolsky has also studied stress in rats and his results indicate that early experiences in young rats have strong, lasting effects. Rats that were exposed to human handling (a stressful situation) had finely-tuned stress responses that may have lowered their lifetime exposure to stress hormones compared to those that were not handled. In short: stress can be adaptive. The more exposure to stressful situations, the better the rat can handle that situation.

Stereotypies

Stereotypies are repetitive, sometimes abnormal behaviors like pacing on the perch for birds. There are adaptive stereotypic behaviors such as grooming in cats and preening in birds. Captive parrots commonly perform a range of stereotypies. These behaviors are repeated identically and lack any function or goal. Captive parrots perform striking oral and locomotor stereotypies like pacing on the perch or repetitive play with a certain toy. Feather picking and loud vocalizations can be stereotypies but are not as rigid and may be reactions to confinement, stress, boredom and loneliness as studies have shown that parrots that are in cages closest to the door are the most prone to feather pick or scream. Feather picking is not a true stereotypy and is more like hair pulling in human and loud vocalizations or screaming can be a stereotypy but vocalization is part of a parrot's natural behavior. Captive parrots lack sufficient stimulation. Presumably they suffer from lack of companionship and opportunities to forage. Stereotypies can evolve from the social environment for example the presence or absence of certain social stimuli, social isolation, low feeder space and high stocking density (especially for tail biting in pigs). These behaviors can also be transmitted through social learning. Bank voles, pigeons and pigs when housed next to animals that show stereotypies, pick them up as well as through stimulus enhancement which is what happens in tail biting in pigs and feather pecking by hens.

Stereotypies may be coping mechanisms as results suggest from study on tethered and stalled sows. Sows that are tethered and stalled exhibited more stereotypies like licking and rubbing than sows that are in groups outdoors. This abnormal behavior seems to be related to opioid (related to the reward system) receptor density. In sows, prolonged confinement, being tethered or being in gestation crates, results in abnormal behaviors and stereotypies. mu and kappa receptors are associated with aversion behaviors and Mu receptor density is greater in tethered sows than sows that are in groups outdoors. However, sows with stereotypy behaviors experienced a decrease both in Mu and Kappa receptor density in the brain suggesting that inactivity increases Mu receptor density and stereotypy development decrease both kappa and Mu receptor density.

Self-aggression

Rhesus macaques have been observed to display self-aggression (SA) including self-biting, self-clasping, self-slapping, self-rubbing and threatening of body parts. The rhesus macaques observed were individually caged and free of disease. Their self-aggression level rose in stressful and stimulating conditions such as moving from one cage to another. Stump-tailed macaques were studied to examine the source of their SA. SA increased in an impoverished environment and results support that SA may increase sensory input in poor environments. Captive macaques do not socialize the way wild macaques do which may affect SA. When allowed to socialize by putting another macaque in the cage or not putting them in a cage, SA levels in macaques decrease. Results indicate that SA is a form of redirected social aggression. SA is related to frustration and social status, especially in macaques that have an intermediate dominance rank.

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