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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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Author |
Aromov B. |
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Title |
The Biology of the Snow Leopard in the Hissar Nature Reserve |
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Miscellaneous |
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Year |
1995 |
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108-109 |
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Keywords |
Uzbekistan; snow leopard; Hissar ridge; Hissar nature reserve; number; diet; breeding.; 6070; Russian; work; Data; biology; snow; snow-leopard; leopard; nature; reserve; snow leopards; snow-leopards; leopards; times; tracks; pugmarks; Feed; ibex; kills; kill; Age; records; predation; Case; horses; horse; marmot; Himalayan; domestic; goat; wild; wild boar; sheep; Cattle; attack |
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The work contains data on biology snow leopard in Hissar nature reserve, Uzbekistan. The number of snow leopards in this reserve has increased from two or four in 1981 to between 13 and 17 individuals in 1994. Since 1981, snow leopards have been sighted 72 times and their tracks or pugmarks 223 times. In the Hissar Nature Reserve snow leopards largely feed on ibex. Over a period of 14 years, 92 kills and remains of ibex aged from one to thirteen years of age have been examined. Other records of predation, by the number of events observed, include 33 cases of juvenile and mature horses, 25 long-tailed marmot (Marmota caudata). 18 Himalayan snowcock (Tetraogallus himalayemis), 17 domestic goat, 13 wild boar (Sus scrofa), five domestic sheep and three incidents involving cattle. Twenty-two attacks on domestic flocks were reported, and these occurred during both the daytime and at night. Snow leopards usually mate between the 20th of February and March 20th. The offspring are born in late April to May, and there are usually two per litter (23 encounters), although a single litter of three has also been recorded. |
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Full text available in RussianJournal Title: Proceeding of 8th International Snow Leopard Symposium Islamabad. |
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SLN @ rana @ 586 |
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99 |
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Author |
Brunstein, L. |
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Title |
Handrearing Snow Leopards in the Cheyenne Mountain Zoo |
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Journal Article |
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1978 |
Publication |
Int.Ped.Book of Snow Leopards |
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1 |
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44-49 |
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hand-rearing; hand; rearing; cubs; bottle; feeding; diet; browse; 3580 |
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SLN @ rana @ 43 |
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200 |
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Author |
Burgener, N.; Gusset, M.; Schmid, H. |
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Title |
Frustrated appetitive foraging behavior, stereotypic pacing, and fecal glucocorticoid levels in snow leopards (Uncia uncia) in the Zurich Zoo |
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Miscellaneous |
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2008 |
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Journal of Applied Animal Welfare Science |
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11 |
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74-83 |
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behavior; captive; fecal; feeding strategy; physiological; snow leopard; zoo |
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This study hypothesized that permanently frustrated, appetitive-foraging behavior caused the stereotypic pacing regularly observed in captive carnivores. Using 2 adult female snow leopards (Uncia uncia), solitarily housed in the Zurich Zoo, the study tested this hypothesis experimentally with a novel feeding method: electronically controlled, time-regulated feeding boxes. The expected result of employing this active foraging device as a successful coping strategy was reduced behavioral and physiological measures of stress, compared with a control-feeding regime without feeding boxes. The study assessed this through behavioral observations and by evaluating glucocorticoid levels noninvasively from feces. Results indicated that the 2 snow leopards did not perform successful coping behavior through exercising active foraging behavior or through displaying the stereotypic pacing. The data support a possible explanation: The box-feeding method did not provide the 2 snow leopards with the external stimuli to satisfy their appetitive behavioral needs. Moreover, numerous other factors not necessarily or exclusively related to appetitive behavior could have caused and influenced the stereotypic pacing. |
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Call Number |
SLN @ rana @ 915 |
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202 |
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Author |
Christiansen, P. |
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Title |
Canine morphology in the larger Felidae: implications for feeding ecology |
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Journal Article |
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Year |
2007 |
Publication |
Biological Journal of the Linnean Society |
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91 |
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573-592 |
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Keywords |
bite force, canine, clouded leopard, feeding behaviour, felid, Homotherium serum, leopard, Megantereoncultridens, morphology, Neofelis nebulosa, paleontology, Panthera pardus, Panthera tigris, puma, Puma concolor, Smilodon fatalis, Smilodon populator, snow leopard, Uncia uncia |
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Canine morphology is analysed at seven intervals along the crown in both
anteroposterior and lateromedial perspective in seven species of large felids. The puma and the snow leopard have stout, rather conical canines, whereas those of lions, jaguars, and tigers bear substantial resemblance to each other, reflecting their phylogenetic relationships, and are less conical and large. The canines of the leopard are intermediate in morphology between those of the other species, probably reflecting its more generalized diet. The clouded leopard has very large and blade-like canines, which are different from the other analysed species. Canine bending strengths to estimated bite forces appear to differ less among the species than morphology,indicating that the evolution of canines has been constricted with respect to their strength in failure, probably owing to their being equally important for species fitness. However, the clouded leopard again stands out, having a high estimated bite force and rather weak canines in bending about the anteroposterior as well as lateromedial planes compared to the other species. Canine morphology to some extent reflects differences in killing mode, but also appears to be related to the phylogeny. The marked divergence of the clouded leopard is presently not understood. |
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SLN @ rana @ |
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1115 |
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Author |
Fox, J.L.; Chundawat, R.S. |
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Title |
Observations of snow leopard stalking, killing and feeding behavior |
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1988 |
Publication |
Mammalia |
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52 |
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1 |
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137-140 |
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India; stalking; killing; feeding; behavior; observations; browse; 850 |
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Full Text at URLDocument Type: English |
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SLN @ rana @ 99 |
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292 |
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Gosselin, S.J.; Loudy, D.L.; Tarr, M.J.; Balistreri, W.F.; Setchell, K.D.; Johnston, J.O.; Kramer, L.W.; Dresser, B.L. |
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Title |
Veno-occlusive disease of the liver in captive cheetah |
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Journal Article |
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1988 |
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Vet Pathol |
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25 |
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1 |
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48-57 |
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Animal; Feed; analysis; Carnivora; Cheetahs; Female; Hepatic; Veno; Occlusive; Disease; pathology; veterinary; Histocytochemistry; Liver; ultrastructure; Male; Microscopy; Electron; Support; Non-U.S.Gov't; Vitamin A; browse; non; us; gov't; government; 280 |
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Liver tissues from 126 captive cheetah were evaluated by light microscopy and histochemistry; eight animals were evaluated by electron microscopy. The main hepatic lesion, a vascular lesion resembling veno- occlusive disease (VOD) of the liver and characterized by subendothelial fibrosis and proliferation of smooth muscle-like cells in the central veins, was seen in 60% of the sexually mature cheetah. Although this hepatic vascular lesion was seen in cheetah as young as 1 year of age, the most severe lesions, usually associated with liver failure, were found in cheetah between the ages of 6 and 11. There was no sex predisposition, and in approximately 40% of the VOD cases, liver disease was not suspected clinically or at necropsy. VOD was found in other felidae, especially in the snow leopard. High levels of vitamin A in livers, as well as in diets of the cheetah, could be a contributing factor in the development of VOD in some groups of cheetah. |
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0300-9858 |
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Document Type: Eng |
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SLN @ rana @ 127 |
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339 |
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Hongguang, H.; Yongfu, X. |
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Captive snow leopards in the Chongqing Zoo |
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1994 |
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191-193 |
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China; zoos; captivity; cage; food; feeding; diet; management; zoo; browse; 3390 |
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Islt |
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Usa |
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J.L.Fox; D.Jizeng |
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Full Text at URLTitle, Monographic: Seventh International Snow Leopard SymposiumPlace of Meeting: ChinaDate of Copyright: 1994 |
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Call Number |
SLN @ rana @ 228 |
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389 |
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Author |
Khan, A. |
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Title |
Snow Leopard Occurrence in Mankial Valley, Swat: Final report |
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Report |
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2004 |
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1-17 |
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snow; snow leopard; snow-leopard; leopard; valley; Report; project; International; international snow leopard trust; International-Snow-Leopard-Trust; trust; program; ecosystem; habitat; species; plants; plant; Animals; Animal; birds; research; action; study; survey; Support; Islt; community; Organization; surveys; winter; information; local; sign; pugmarks; feces; scrapes; scrape; prey; prey species; prey-species; recent; population; markhor; hunting; Culture; Pressure; areas; area; feeding; livestock; burning; decline |
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Mankial is a sub-valley of the Swat Kohistan. Temperate ecosystem of the valley is intact to a greater extent, which provides habitat to a variety of species of plants, animals and birds. Snow leopard is reported from the valley. To confirm its occurrence, the HUJRA (Holistic Understanding for Justified Research and Action), conducted the study titled “Snow Leopard Survey in Mankial Valley, district Swat, NWFP”. The author provided technical support, while ISLT (The International Snow Leopard Trust) funded the project under its small grants program. The World Wide Fund for Nature-Pakistan (WWF-Pakistan) and the Mankial Community Organization (MCO) facilitated surveys under the project. Surveys revealed that Snow leopard visits parts of the Mankial valley in winter months. Information from the local community shows that Snow leopard remains in the Serai (an off-shoot of the Mankial Valley) from early winter to early spring. Intensive surveys of the prime snow leopard winter habitat in the valley found several snow leopard signs including pugmarks, feces, and scrapes. The study also found occurrence of prey species through indirect evidence though. However, information from the local community confirmed that in the recent past there was a good population of markhor in the valley, which is now reduced to less than 50, mostly due to hunting and habitat disturbance. Hunting is part of the local culture and lifestyle. During winter months hunting pressure is low, as most of the local community migrates to warmer plain areas than Mankial Valley. However, those who live in the area lop oak branches for feeding their livestock and cut trees for burning, in addition to hunting prey species of snow leopard. This has resulted in stunted oak vegetation in most of the lower reaches of the valley and decline of the markhor population. |
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Project funded by International Snow Leopard Trust Small Grants Program, 2003. |
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SLN @ rana @ 1069 |
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530 |
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Author |
Lilin, Z. |
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Title |
Captive rearing of a wild snow leopard cub in the Xining Zoo, China |
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Conference Article |
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Year |
1994 |
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177-182 |
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zoos; captivity; zoo; husbandry; rearing; distribution; diet; food; feeding; young; cubs; reproduction; breeding; mating; China; browse; 3700 |
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Islt |
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Usa |
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J.L.Fox; D.Jizeng |
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Full text at URLTitle, Monographic: Seventh International Snow Leopard SymposiumPlace of Meeting: ChinaDate of Copyright: 1994 |
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Call Number |
SLN @ rana @ 245 |
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619 |
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