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| Author | Ale, S.; Brown, J. | ||||
| Title | The contingencies of group size and vigilance | Type | Miscellaneous | ||
| Year | 2007 | Publication | Evolutionary Ecology Research, | Abbreviated Journal | |
| Volume | 9 | Issue | Pages | 1263-1276 | |
| Keywords | 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 | ||||
| Abstract | 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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| Language | English | Summary Language | Original Title | ||
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Approved | no | |||
| Call Number | SLN @ rana @ 886 | Serial | 53 | ||
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| Author | Jackson, R.; Roe, J.; Wangchuk, R.; Hunter, D. | ||||
| Title | Camera-Trapping of Snow Leopards | Type | Journal Article | ||
| Year | 2005 | Publication | Cat News | Abbreviated Journal | |
| Volume | 42 | Issue | Spring | Pages | 19-21 |
| Keywords | camera trapping; snow; snow leopards; snow leopard; snow-leopards; snow-leopard; leopards; leopard; felids; tigers; tiger; techniques; surveys; survey; information; factor; marking; behavior; Ahlborn; Jackson; habitat; status; range; census; India; Hemis; High; national; national park; National-park; park; Ladakh; leh | ||||
| Abstract | Solitary felids like tigers and snow leopards are notoriously difficult to enumerate, and indirect techniques like pugmark surveys often produce ambiguous information that is difficult to interpret because many factors influence marking behavior and frequency (Ahlborn & Jackson 1988). Considering the snow leopard's rugged habitat, it is not surprising then that information on its current status and occupied range is very limited. We adapted the camera-trapping techniques pioneered by Ullas Karanth and his associates for counting Bengal tigers to the census taking of snow leopards in the Rumbak watershed of the India's Hemis High Altitude National Park (HNP), located in Ladakh near Leh (76ø 50' to 77ø 45' East; 33ø 15' to 34ø 20'North). | ||||
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Approved | no | |||
| Call Number | SLN @ rana @ 1017 | Serial | 475 | ||
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| Author | Kitchener, S.L.; Meritt; Rosenthal, M. | ||||
| Title | Observations on the breeding and husbandry of snow leopards, Panthera uncia | Type | Journal Article | ||
| Year | 1975 | Publication | Int.Zoo Yearbook | Abbreviated Journal | |
| Volume | 15 | Issue | Pages | 212-217 | |
| Keywords | breeding; husbandry; behavior; captivity; zoos; zoo; browse; 3640; Adult; care; biology; growth; mortality; factor; young; snow; snow leopards; snow leopard; snow-leopards; snow-leopard; leopards; leopard; program; park | ||||
| Abstract | Describes adult care and breeding biology, and the care, growth, and mortality factors of young snow leopards in a successful breeding program in the Lincon Park Zoo, Chicago, Illinois. | ||||
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Approved | no | |||
| Call Number | SLN @ rana @ 31 | Serial | 535 | ||
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| Author | Wahlberg, C.; Tarkkanen, A.; Blomqvist, L. | ||||
| Title | Further observations on the multiple ocular coloboma (MOC) in the snow leopard, Panthers uncia | Type | Book Chapter | ||
| Year | 1982 | Publication | International Pedigree Book of Snow Leopards | Abbreviated Journal | |
| Volume | 3 | Issue | Pages | 139-144 | |
| Keywords | observations; multiple; Coloboma; snow; snow leopard; snow-leopard; leopard; uncia; International; pedigree; snow leopards; snow-leopards; leopards; Syndrome; eye; colobomatous; retinal; Retinal-Dysplasia; dysplasia; Case; zoo; factor | ||||
| Abstract | The first observation of the occurrence of multiple ocular coloboma (MOC) in a snow leopard was reported in the International Pedigree Book of Snow Leopards Volume I in 1978 (1). The lesions in this syndrome consist of coloboma of the upper eye lid and uveal coloboma of the globe. Even colobomatous retinal cysts and retinal dysplasia have been noted. The ethiology of in all ten cases of MOC in the snow leopards kept at the Helsinki Zoo were described and discussed in detail in Volume II of the International Pedigree Book of Snow Leopards (2,3). Three cases of MOC in the snow leopards kept at Henry Doorly Zoo, Omaha, Ne., have been described by Phillips (4), one case is known of in Amsterdam (van Bree, personal communication), and two cases in Zoo Zurich (Isenbugel and Weilenmann, pers. comm.) The ethiology of the defect is still not known although various theories ranging from genetic to exogenous factors have been presented. | ||||
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| Publisher | Helsinki Zoo | Place of Publication | Helsinki | Editor | Blomqvist, L. |
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Approved | no | |||
| Call Number | SLN @ rana @ 982 | Serial | 1000 | ||
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