Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/73088
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Type: Journal article
Title: Decoupling of component and ensemble density feedbacks in birds and mammals
Author: Herrando-Perez, S.
Delean, J.
Brook, B.
Bradshaw, C.
Citation: Ecology, 2012; 93(7):1728-1740
Publisher: Ecological Soc Amer
Issue Date: 2012
ISSN: 0012-9658
1939-9170
Statement of
Responsibility: 
Salvador Herrando-Perez, Steven Delean, Barry W. Brook, and Corey J. A. Bradshaw
Abstract: A 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.
Keywords: compensation; conservation; density dependence; depensation; fertility; management; mortality; population regulation; recruitment; survival.
Rights: © 2012 by the Ecological Society of America
RMID: 0020121068
DOI: 10.1890/11-1415.1
Grant ID: http://purl.org/au-research/grants/arc/DP0878582
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications
Environment Institute publications

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