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dc.contributor.authorHerrando-Perez, S.en
dc.contributor.authorDelean, J.en
dc.contributor.authorBrook, B.en
dc.contributor.authorBradshaw, C.en
dc.identifier.citationEcology, 2012; 93(7):1728-1740en
dc.description.abstractA component density feedback represents the effect of change in population size on single demographic rates, whereas an ensemble density feedback captures that effect on the overall growth rate of a population. Given that a population's growth rate is a synthesis of the interplay of all demographic rates operating in a population, we test the hypothesis that the strength of ensemble density feedback must augment with increasing strength of component density feedback, using long-term censuses of population size, fertility, and survival rates of 109 bird and mammal populations (97 species). We found that compensatory and depensatory component feedbacks were common (each detected in 50% of the demographic rates). However, component feedback strength only explained <10% of the variation in ensemble feedback strength. To explain why, we illustrate the different sources of decoupling between component and ensemble feedbacks. We argue that the management of anthropogenic impacts on populations using component feedbacks alone is ill-advised, just as managing on the basis of ensemble feedbacks without a mechanistic understanding of the contributions made by its components and environmental variability can lead to suboptimal decisions.en
dc.description.statementofresponsibilitySalvador Herrando-Perez, Steven Delean, Barry W. Brook, and Corey J. A. Bradshawen
dc.publisherEcological Soc Ameren
dc.rights© 2012 by the Ecological Society of Americaen
dc.subjectcompensation; conservation; density dependence; depensation; fertility; management; mortality; population regulation; recruitment; survival.en
dc.titleDecoupling of component and ensemble density feedbacks in birds and mammalsen
dc.typeJournal articleen
pubs.library.collectionEarth and Environmental Sciences publicationsen
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications
Environment Institute publications

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