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Breeding durations as estimators of adult sex ratios and population size

Citation

Payne, NL and Gillanders, BM and Semmens, JM, Breeding durations as estimators of adult sex ratios and population size, Oecologia, 165, (2) pp. 341-347. ISSN 0029-8549 (2011) [Refereed Article]


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Copyright Statement

Copyright © Springer-Verlag 2010. The final publication is available at http://www.springerlink.com

DOI: doi:10.1007/s00442-010-1729-7

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.

Item Details

Item Type:Refereed Article
Keywords:Acoustic telemetry Breeding aggregation Operational sex ratio Sepia apama Viability analysis
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Sciences not elsewhere classified
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Semmens, JM (Associate Professor Jayson Semmens)
ID Code:72015
Year Published:2011
Web of Science® Times Cited:13
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2011-08-18
Last Modified:2012-04-05
Downloads:0

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