, Volume 165, Issue 2, pp 341–347 | Cite as

Breeding durations as estimators of adult sex ratios and population size

  • Nicholas Leslie PayneEmail author
  • Bronwyn May Gillanders
  • Jayson Semmens
Population ecology - Original Paper


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.


Acoustic telemetry Breeding aggregation Operational sex ratio Sepia apama Viability analysis 



We thank Jim Mitchell (Santos Limited) for infrastructure support, and all volunteers for field assistance. Financial support was provided by The Field Naturalists Society of South Australia, Australian Geographic Society, Santos Limited., Mark Mitchell Foundation, and the ANZ Holsworth Foundation.


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Nicholas Leslie Payne
    • 1
    Email author
  • Bronwyn May Gillanders
    • 1
  • Jayson Semmens
    • 2
  1. 1.Southern Seas Ecology Laboratories, DX 650 418, School of Earth and Environmental SciencesUniversity of AdelaideAdelaideAustralia
  2. 2.Tasmanian Aquaculture and Fisheries InstituteUniversity of TasmaniaTaroonaAustralia

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