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Type: Journal article
Title: Breeding durations as estimators of adult sex ratios and population size
Author: Payne, N.
Gillanders, B.
Semmens, J.
Citation: Oecologia, 2011; 165(2):341-347
Publisher: Springer
Issue Date: 2011
ISSN: 0029-8549
Statement of
Nicholas Leslie Payne, Bronwyn May Gillanders and Jayson Semmens
Abstract: Adult sex ratios (ASRs) and population size are two of the most fundamental parameters in population biology, as they are the main determinants of genetic and demographic viability, and vulnerability of a population to stochastic events. Underpinning the application of population viability analysis for predicting the extinction risk of populations is the need to accurately estimate parameters that determine the viability of populations (i.e. the ASR and population size). Here we demonstrate that a lack of temporal information can confound estimation of both parameters. Using acoustic telemetry, we compared differences in breeding durations of both sexes for a giant Australian cuttlefish Sepia apama breeding aggregation to the strongly male-biased operational sex ratio (4:1), in order to estimate the population ASR. The ratio of breeding durations between sexes was equal to the operational sex ratio, suggesting that the ASR is not strongly male-biased, but balanced. Furthermore, the short residence times of individuals at the breeding aggregation suggests that previous density-based abundance estimates have significantly underestimated population size. With the current wide application of population viability analysis for predicting the extinction risk of populations, tools to improve the accuracy of such predictions are vital. Here we provide a new approach to estimating the fundamental ASR parameter, and call for temporal considerations when estimating population size.
Keywords: Acoustic telemetry
Breeding aggregation
Operational sex ratio
Sepia apama
Viability analysis
Rights: Copyright Springer-Verlag 2010
DOI: 10.1007/s00442-010-1729-7
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Appears in Collections:Aurora harvest 5
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