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Ale, S.; Whelan, C. |
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Title |
Reappraisal of the role of big, fierce predators |
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Miscellaneous |
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2008 |
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Biodiversity Conservation |
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685-690 |
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Biodiversity ú Conservation ú Costs of predation ú Indirect effects ú Non-lethal effects ú Predators ú Top-down control; big; predators; predator |
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Abstract |
The suggestion in the early 20th century that top predators were a necessary component of ecosystems because they hold herbivore populations in check and promote biodiversity was at Wrst accepted and then largely rejected. With the advent of Evolutionary Ecology and a more full appreciation of direct and indirect effects of top predators, this role of top predators is again gaining acceptance. The previous views were predicated upon lethal effects of predators but largely overlooked their non-lethal effects. We suggest that
conceptual advances coupled with an increased use of experiments have convincingly demonstrated that prey experience costs that transcend the obvious cost of death. Prey species use adaptive behaviours to avoid predators, and these behaviours are not cost-free. With predation risk, prey species greatly restrict their use of available habitats and consumption of available food resources. Effects of top predators consequently cascade down to the trophic levels below them. Top predators, the biggies, are thus both the targets of and the means for conservation at the landscape scale. |
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SLN @ rana @ 885 |
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52 |
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Author |
Ale, S.; Brown, J. |
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Title |
The contingencies of group size and vigilance |
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Miscellaneous |
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Year |
2007 |
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Evolutionary Ecology Research, |
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9 |
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1263-1276 |
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attraction effect,contingency,dilution effect,fitness,group-size effect,many-eyes effect,predation risk,vigilance behaviour; predation; decline; potential; predators; predator; feeding; Animals; Animal; use; food; effects; Relationship; behaviour; methods; game; Interactions; interaction; factor; value; Energy |
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Background: Predation risk declines non-linearly with one's own vigilance and the vigilance of others in the group (the 'many-eyes' effect). Furthermore, as group size increases, the individual's risk of predation may decline through dilution with more potential victims, but may increase if larger groups attract more predators. These are known, respectively, as the dilution effect and the attraction effect.
Assumptions: Feeding animals use vigilance to trade-off food and safety. Net feeding rate declines linearly with vigilance.
Question: How do the many-eyes, dilution, and attraction effects interact to influence the relationship between group size and vigilance behaviour?
Mathematical methods: We use game theory and the fitness-generating function to determine the ESS level of vigilance of an individual within a group.
Predictions: Vigilance decreases with group size as a consequence of the many-eyes and dilution effects but increases with group size as a consequence of the attraction effect, when they act independent of each other. Their synergetic effects on vigilance depend upon the relative strengths of each and their interactions. Regardless, the influence of other factors on vigilance – such as encounter rate with predators, predator lethality, marginal value of energy, and value of vigilance – decline with group size. |
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SLN @ rana @ 886 |
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53 |
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Anonymous |
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International Specialists Discuss China's Threatened Cats |
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Miscellaneous |
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1992 |
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China; Iucn; habitat; predator; prey; livestock; herders; conflict; hunting; poaching; trapping; bones; medicine; trade; development; Slims; Cites; protected-areas; parks; preserves; reserves; refuge; browse; protected; areas; 3990 |
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Full text at URL |
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SLN @ rana @ 186 |
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80 |
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Anonymous |
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Livestock Predation Control Workshop |
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Miscellaneous |
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1999 |
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Lahul-Spiti; Ladakh; Hemis; parks; reserves; refuge; protected-area; argali; abix; blue-sheep; wolves; distribution; status; population; poaching; hunting; trade; skins; livestock; pelts; coat; fur; bones; medicine; prey-depletion; herders; habitat; habitat-degradation; tourism; Tmi; Islt; predator; prey; conflict; compensation; trekking; blue; sheep; browse; protected; area; depletion; degradation; international snow leopard trust; 3940 |
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Full Text at URLDate of Meeting: Ladakh (1999 Oct 6- Oct 10 ) |
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SLN @ rana @ 359 |
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86 |
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Anonymous |
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Title |
A snow leopard conservation plan for Mongolia |
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Report |
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2000 |
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1-8 |
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awareness; behaviour; biodiversity; conservation plan; decline; density; ecology; fund-raising; funding; habitat degradation; Himalayan; management; Mongolia; montane; pastoralists; pelt; predator; snow-leopard-conservation-plan; snow leopard; trade; Wwf |
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The snow leopard faces multiple threats in the Himalayan region, from habitat degradation, loss of prey, the trade in pelts, parts and live animals, and conflict with humans, primarily pastoralists. Consequently, the populations are considered to be in decline and the species is listed as Endangered in the IUCN's Red List. As a 'flagship' and 'umbrella' species the snow leopard can be a unifying biological feature to raise awareness of its plight and the need for conservation, which will benefit other facets of Himalayan biodiversity as well. Some studies of snow leopards have been conducted in the Himalayan region. But, because of its elusive nature and preference for remote and inaccessible habitat, knowledge of the ecology and behaviour of this mystical montane predator is scant. The available information, however, suggests that snow leopards occur at low densities and large areas of habitat are required to conserve a viable population. Thus, many researchers and conservationists have advocated landscape-scale approaches to conservation within a regional context, rather than focusing on individual protected areas.This regional strategy for WWF's snow leopard conservation program is built on such an approach. The following were identified as important regional issues: 1) international trade in snow leopards and parts; 2) the human-snow leopard conflict; 3) the need for a landscape approach to conservation to provide large spatial areas that can support demographically and ecologically viable snow leopard metapopulations; 4) research on snow leopard ecology to develop long-term, science-based conservation management plans; and 5) regional coordination and dialog. While the issues are regional, the WWF's in the region have developed 5-year strategic actions and activities, using the regional strategies as a touchstone, which will be implemented at national levels. The WWF's will develop proposals based on these strategic actions, with estimated budgets, for use by the network for funding and fund-raising. WWF also recognizes the need to collaborate and coordinate within the network and with other organizations in the region to achieve conservation goals in an efficient manner, and will form a working group to coordinate activities and monitor progress. |
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Publication date unknown but must be at least from 2000. |
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SLN @ rana @ 995 |
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92 |
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Author |
Baidavletov R.J. |
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Title |
Large predators of the Kazakhstan Altai and their importance for hunting industry |
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Miscellaneous |
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2002 |
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79-81 |
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Kazakhstan; Altai; large predators; snow leopard; distribution; number; preys.; 6110; Russian |
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Fauna of large predatory mammals in the Kazakhstan Altai is represented by five species: wolf, bear, glutton, lynx, and snow leopard. Snow leopard inhabits the Sarymsakty and Tarbagai ridges and South Altai. This species is observed to regularly penetrate into the Kutun and Kurchum ridges. Its habitat covers an area of 1,800 sq. km, its population being 14-16 animals. The population density is 0.7 1.0 animals per 100 sq. km. A hunting area of a female animal with two cubs is 45 85 sq. km; a male 120 sq. km. Snow leopard main preys on ibex (41.1 percent), roe-deer (31.0 percent), and moral (13.8 percent); in summer on gray marmot (28.6 percent). Snow leopard is also known to prey on hares, birds, argali, and elks. |
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Full text available in RussianJournal Title: Zoological studies in Kazakhstan. |
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SLN @ rana @ 590 |
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107 |
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Author |
Chundawat, R.S.; Rawat G.S. |
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Title |
Food Habits of Snow Leopard in Ladakh, India |
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Miscellaneous |
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1990 |
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11 |
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India; Ladakh; behavior; predator; prey; livestock; blue-sheep; ibex; ungulates; marmots; parks; refuge; protected-area; reserves; diet; habitat; scat; kills; blue; sheep; browse; protected; area; 970 |
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The snow leopard has remained little studied in the past, and most of the information available is either in the form of natural history or anecdotal notes. The inaccessibility of the terrain and its secretive habits make this one of the more difficult animals to study in the wild. In the past decade, several ecological surveys were conducted in India, Nepal, China and Mongolia, which gave us information on the status and distribution of snow leopard (Jackson, Mallon, Fox, Schaller, Chundawat) A detailed study in Nepal through light on its secretive habits ( Jackson and Ahlborn, 1989). Even then little is known about its feeding habits. The present paper discusses this aspect from a study which was part of a detailed study conducted on the ecology of snow leopard in India from October 1987 to Feburary 1990. |
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full text available at URL |
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SLN @ rana @ 305 |
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223 |
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Chundawat, R.S. |
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Title |
Ecological Studies of Snow Leopard and its Associated Prey Species in Hemis High Altitude Park, Ladakh (J&K) |
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1992 |
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90 pages |
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India; Ladakh; snow-leopard; predator; prey; herder; blue-sheep; habitat; herders; Hemis; parks; reserves; refuge; protected-area; snow leopard; blue; sheep; browse; protected; area; 980 |
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Ph.D. thesis |
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University of Rajasthan |
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Snow Leopard Trust holds one copyPlace of Publication: Indira Gandhi Centre for Human Ecology, Environmental and Population Studies, University of Rajastan, Jaipur-302 004, IndiaDate of Copyright: 1992 |
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SLN @ rana @ 188 |
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224 |
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Author |
Egorov O.V. |
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Title |
Enemies, infections, parasites and mortality rate of ibex |
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Miscellaneous |
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1955 |
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Vol. 42. |
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37-50 |
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Ussr; ungulates; predators; snow leopard.; 6520; Russian |
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Reasons for ibex and argali mortality from natural enemies, parasites, infections, accidents, and hunters are analyzed. Snow leopard is one of the most dangerous enemies of ibex and argali, preying equally on both young and mature animals (mostly males). Snow leopard feeds upon ibex all year round. Unlike wolf, snow leopard would never kill several animals at a time, but only one selected victim. The food remains left by these predators are different in terms of the skull gnawing. Nasal bones and eye-sockets on the skull of ibex killed by snow leopard remain undamaged, while wolf gnaws off nasal part of the skull, breaks eye-sockets, eats lower jaw, widens occipital hole and pulls out brains. Snow leopard leaves large pieces of skin around the skeleton of the victim, whereas wolf tears it to shreds or eats up fully. Sometimes parts of the victim left by snow leopard are eaten by wolf. It is easy to mix the remains of snow leopard's or griffon vulture's food. The remains differ in skin being turned inside out rather than torn to large pieces. |
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Full text available in RussianJournal Title: Proceedings of ZIN of the Academy of Science of the USSR. |
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SLN @ rana @ 630 |
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251 |
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Esipov A.V. |
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Distribution and Numbers of the Siberian Ibex in the Hissar Nature Reserve, Uzbekistan |
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2002 |
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76-78 |
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Uzbekistan; Hisssar nature reserve; wild ibex; distribution; number; predators; snow leopard.; 6640; Russian |
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It describes distribution and number of ibex in four parts of the Hissar nature reserve in Uzbekistan. The total number of ibex is estimated to be 1,500 animals. The natural enemies of ibex are snow leopard, wolf, and lynx. Data about ibex's food, seasonal migrations, and threats are given. Decreasing forage reserve and poaching are considered as the most serious threats. A buffer zone is suggested to be established in the areas adjacent to Tajikistan and the Surkhandarya region of Uzbekistan. |
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Full text available in RussianJournal Title: Necessity of nature protection in South Uzbekistan. |
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SLN @ rana @ 642 |
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258 |
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