Arid
DOI10.1890/09-0286.1
Predator-mediated Allee effects in multi-prey systems
McLellan, Bruce N.2; Serrouya, Robert2,3; Wittmer, Heiko U.1; Boutin, Stan3
通讯作者Wittmer, Heiko U.
来源期刊ECOLOGY
ISSN0012-9658
EISSN1939-9170
出版年2010
卷号91期号:1页码:286-292
英文摘要

Allee effects Call have significant consequences for small populations and understanding the Causal Mechanisms for such effects is important for guiding conservation actions. One proposed mechanism is through predation, in which a type II functional response leads to increasing predation rates as prey numbers decline. However, models to support this mechanism have incorporated only a single declining prey species in the functional response, which is probably all oversimplification. We reevaluated the potential for predator-mediated Allee effects in a multi-prey system using Holling’s disc equation. We also used empirical data oil a large herbivore to examine how grouping behavior may influence the potential for predation-mediated Allee effects. Results based oil a multi-prey expression of the functional response predict that Allee effects caused by predation oil relatively rare secondary prey may not occur because handling time of the abundant prey dominates the functional response such that secondary prey are largely "bycatch." However. a predator-mediated Allee effect can occur if secondary Prey live in groups and if, as the population declines, their average group size declines (a relationship seen in several species). In such a case, the rate at which the number of groups declines is less than the rate at which the Population declines. Thus the rate at which a predator encounters a group remains relatively stable, but when a predator kills one animal front smaller groups the predation rate increases. These results highlight the need to evaluate risks associated with potential changes in group size as populations decline.


英文关键词Allee effect apparent competition conservation functional response mountain ecotype woodland caribou predator-prey interactions Rangifer tarandus caribou social organization southeastern British Columbia, Canada
类型Article
语种英语
国家USA ; Canada
收录类别SCI-E
WOS记录号WOS:000275458500031
WOS关键词FUNCTIONAL-RESPONSE ; BRITISH-COLUMBIA ; WOODLAND CARIBOU ; GROUP-SIZE ; POPULATION ; WOLVES ; DYNAMICS ; CONSEQUENCES ; DENSITY ; DESERT
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/163915
作者单位1.Univ Calif Davis, Davis, CA 95616 USA;
2.British Columbia Minist Forests & Range, Revelstoke, BC V0E 3K0, Canada;
3.Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada
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McLellan, Bruce N.,Serrouya, Robert,Wittmer, Heiko U.,et al. Predator-mediated Allee effects in multi-prey systems[J]. University of California, Davis,2010,91(1):286-292.
APA McLellan, Bruce N.,Serrouya, Robert,Wittmer, Heiko U.,&Boutin, Stan.(2010).Predator-mediated Allee effects in multi-prey systems.ECOLOGY,91(1),286-292.
MLA McLellan, Bruce N.,et al."Predator-mediated Allee effects in multi-prey systems".ECOLOGY 91.1(2010):286-292.
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