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Type: Journal article
Title: Too few data and not enough time: Approaches to detecting Allee effects in threatened species
Author: Gilroy, J.
Virzi, T.
Boulton, R.
Lockwood, J.
Citation: Conservation Letters, 2012; 5(4):313-322
Publisher: Wiley-Blackwell Publishing Ltd
Issue Date: 2012
ISSN: 1755-263X
Statement of
James J. Gilroy, Thomas Virzi, Rebecca L. Boulton, & Julie L. Lockwood
Abstract: The detection of Allee effects is critical in assessing extinction risk, but is extremely difficult when sampling small, low-density populations. Failure to detect true Allee effects could lead to overoptimistic assessments of threat status, as well as the development of inappropriate species recovery plans. We outline a broadly applicable approach for evaluating Allee effect likelihood in analyses of sparse demographic data, explicitly acknowledging the uncertainties associated with detecting subtle Allee effects among the suite of factors that can influence demographic variability. Detailed information on the probability of Allee effects will empower conservation decision makers to balance extinction risks against the political and economic costs associated with management action. We use an illustrative case study involving demographic analyses of the endangered Cape Sable seaside sparrow, highlighting the value of information on Allee effect likelihood for the development of restoration measures within species recovery plans.
Keywords: Demographic analysis
positive density dependence
extinction risk
prediction bootstrap
survival modeling
Cape Sable seaside sparrow
Rights: © 2012 Wiley Periodicals, Inc.
DOI: 10.1111/j.1755-263X.2012.00245.x
Appears in Collections:Aurora harvest 4
Earth and Environmental Sciences publications

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