| Records |
Author  |
Baldi, R.; Pelliza-Sbriller, A.; Elston, D.; Albon, S. |
| Title |
High Potential For Competition Between Guanacos And Sheep In Patagonia |
Type |
Journal Article |
| Year |
2004 |
Publication |
Journal of Wildlife Management |
Abbreviated Journal |
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| Volume |
68 |
Issue |
4 |
Pages |
924-938 |
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| Abstract |
Guanacos (Lama guanicoe) are the largest native Artiodactyl in South America and the most widely distributed. In arid Patagonia, densities are low and negatively related to domestic sheep numbers in space and time consistent with interspecific competition theory. Although guanacos and domestic sheep have been described as intermediate feeders sharing food resources, no studies have been conducted to compare their diets in sympatric conditions and explore whether the potential exists for direct interspecific competition. We assessed the diet of both species across 9 different sites and 2 seasons by microhistological analysis of fecal samples. We found that (1) guanacos and sheep are generalist herbivores feeding on a wide range of plant species; (2) both are intermediate feeders able to include both monocotyledoneous and dicotyledoneous plants in their diet; (3) both are able to change their diets seasonally; and (4) food niche overlap is high, particularly in summer when food resources are more scarce than in spring. We conclude that the potential for competition between guanacos and sheep is high and could have played a major role in the demise of guanacos. Consequently, current management practices focused on maximizing sheep numbers are not compatible with the recovery of guanaco populations. |
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Equine Behaviour @ team @ |
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4253 |
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Clutton-Brock, T.H.; Albon, S.D.; Gibson, R.M.; Guinness, F.E. |
| Title |
The logical stag: Adaptive aspects of fighting in red deer (Cervus elaphus L.) |
Type |
Journal Article |
| Year |
1979 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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27 |
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Part 1 |
Pages |
211-225 |
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For red deer stags, fighting both has appreciable costs and yields considerable benefits. Up to 6% of rutting stags are permanently injured each year, while fighting success and reproductive success are closely related, within age groups as well as across them. Fighting behaviour is sensitive to changes in the potential benefits of fighting: stags fight most frequently and most intensely where potential benefits are high and tend to avoid fighting with individuals they are unlikely to beat. The relevance of these findings to theoretical models of fighting behaviour is discussed. |
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refbase @ user @ |
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860 |
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Clutton-Brock, T.H.; Green, D.; Hiraiwa-Hasegawa, M.; Albon, S.D. |
| Title |
Passing the buck: resource defence, lek breeding and mate choice in fallow deer |
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Journal Article |
| Year |
1988 |
Publication |
Behav. Ecol. Sociobiol. |
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23 |
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281-296 |
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lsquoLekrsquo breeding systems, where males defend small, clustered mating territories, are thought to occur where the distribution of females is heavily clumped but males are unable to defend resources used by females. In this paper, we describe a breeding system in fallow deer where males are able to defend resources used by females but the most successful bucks instead defend small territories on a traditional mating ground; where the lek is sited in an area not heavily used by females at other times of year and is visited primarily by females in or close to oestrus; and where mating success on the lek is related to territory position and to male phenotype but not to the resources available on different lek territories. Comparisons with other ungulates suggest that lek breeding species fall into two groups: those where leks are regularly visited by herds of females many of which are not in oestrus and those, like fallow deer, where leks are visited primarily by oestrous females. In the latter species, it is unlikely that females visit the lek for ecological reasons. |
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10.1007/Bf00300575 |
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Equine Behaviour @ team @ |
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4882 |
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| Author |
Clutton-Brock, T.H.; Guinness, F.E.; Albon, S.D. |
| Title |
Red Deer: The Behavior and Ecology of Two Sexes |
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Miscellaneous |
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1982 |
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Equine Behaviour @ team @ |
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4886 |
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