Allee Effects in Ecology and Conservation by Franck Courchamp

By Franck Courchamp

Allee results are (broadly) outlined as a decline in person health at low inhabitants dimension or density. they could bring about severe inhabitants thresholds less than which populations crash to extinction. As such, they're very appropriate to many conservation programmes, the place scientists and bosses are usually operating with populations which were decreased to low densities or small numbers. there are a selection of mechanisms which may create Allee results together with mating structures, predation, environmental amendment, and social interactions. The abrupt and unexpected collapses of many exploited populations is only one representation of the necessity to carry Allee results to the leading edge of conservation and administration concepts. Allee results in Ecology and Conservation offers a concise but authoritative evaluate of the subject, collating and integrating a broadly dispersed literature from quite a few fields - marine and terrestrial, plant and animal, theoretical and empirical, educational and utilized. This obtainable textual content, with its transparent and easy motives of either empirical observations and theoretical predications is very appropriate for pro and educational ecologists requiring an outline of the cutting-edge in Allee impact study, in addition to for graduate scholars in inhabitants ecology and conservation biology. it is going to even be of relevance to a large readership of execs in conservation and administration requiring a concise precis of the subject.

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It may, however, still suffer a reduction in pollination rate since the majority of pollen will not come from conspecifics. Likewise, a dense population in a small habitat patch may be less attractive to pollinators because of a scarcity of other attractive species. Overall, pollination rates will probably be greatest for a large population in a large fragment, lowest in a small population in a small fragment and intermediate for large populations in small fragments or vice versa. As ever the reader is warned to look carefully at the specific variables used in each study.

G. see Kolb and Lindhorst 2006). Pollinators are often generalists, and in this case will respond to the availability of a range of plant species, rather than just the species of interest to us. A small or sparse population may thus not suffer a reduction in pollinator visits if it is in a large habitat patch surrounded by other species attractive to pollinators. It may, however, still suffer a reduction in pollination rate since the majority of pollen will not come from conspecifics. Likewise, a dense population in a small habitat patch may be less attractive to pollinators because of a scarcity of other attractive species.

G. g. predation). Allee effects with 'general' mechanisms are potentially applicable to a wider range of taxa. g. presence of particular predators), and so may be present in some areas or time periods and absent in others. There are also mechanisms which act on population size and mechanisms which act on population density, or both. This means that Allee effects can arise in dense populations (if small), and in large populations (if sparse). Numerous Allee effect mechanisms exist, and there are many exciting studies which demonstrate these mechanisms and their impacts on natural populations.

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