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Population Ecology

, Volume 50, Issue 1, pp 17–23 | Cite as

Is relative abundance a good indicator of population size? Evidence from fragmented populations of a specialist butterfly (Lepidoptera: Lycaenidae)

  • Neil Collier
  • Duncan A. Mackay
  • Kirsten Benkendorff
Original Article

Abstract

A common task for conservation biologists and ecologists is to establish how many individuals there are in a population, usually within a defined area of habitat. Estimates of both absolute and relative population sizes are widely used in many aspects of population conservation and management. Mark–recapture studies are appropriate for estimating the absolute population sizes of a wide range of animals, in both open and closed populations, while relative abundances can be estimated from a variety of survey methods. Relative abundances are often used in a comparative way to compare both population size and fluctuations in abundance. Here, we used transect counts and capture–recapture studies to estimate the relative abundances and population sizes of a specialist butterfly, Theclinesthes albocincta (Lycaenidae) in three habitat fragments, over two consecutive years. The sizes of the three populations differed significantly between sites and were highly variable between years. One population was extremely small and is likely to become locally extinct. We found that estimates of relative abundance were highly correlated with estimates of population size (r 2 = 0.88, P = 0.017) derived from the open population models. The combination of transect counts and capture–recapture studies used in this study appears to be a very informative tool for the conservation and management of this butterfly species and could be extended to other insects.

Keywords

Mark–recapture Transect Population models Monitoring Landscape 

Notes

Acknowledgements

We would like to thank the Australian Research Council and the Nature Foundation (South Australia) for providing generous financial support for the study. We would also like to thank TRU Energy Australia for their cooperation and help in accessing the Torrens Island study site. Two anonymous referees provided constructive criticism that improved the quality of the paper.

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Copyright information

© The Society of Population Ecology and Springer 2007

Authors and Affiliations

  • Neil Collier
    • 1
    • 2
  • Duncan A. Mackay
    • 1
  • Kirsten Benkendorff
    • 1
  1. 1.School of Biological SciencesFlinders University of South AustraliaAdelaideAustralia
  2. 2.School for Environmental Research, Institute of Advanced StudiesCharles Darwin UniversityDarwinAustralia

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