The influence of abundance on detectability

Michael A. McCarthy*, Joslin L. Moore, William K. Morris, Kirsten M. Parris, Georgia E. Garrard, Peter A. Vesk, Libby Rumpff, Kate M. Giljohann, James S. Camac, S. Sana Bau, Tessa Friend, Barnabas Harrison, Benita Yue

*Corresponding author for this work

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

Plant and animal survey detection rates are important for ecological surveys, environmental impact assessment, invasive species monitoring, and modeling species distributions. Species can be difficult to detect when rare but, in general, how detection probabilities vary with abundance is unknown. We developed a new detectability model based on the time to detection of the first individual of a species. Based on this model, the predicted detection rate is proportional to a power function of abundance with a scaling exponent between zero and one that depends on clustering of individuals. We estimated the model parameters with data from three independent datasets: searches for chenopod shrub species and coins, experimental searches for planted seedlings, and frog surveys at multiple sites in sub-tropical forests of eastern Australia. Analyses based on the detection time and detection probability suggest that detection rate increases with abundance as predicted. The model provides a way to scale detection rates to cases of low abundance when direct estimation of detection rates is often impractical.

Original languageEnglish
Pages (from-to)717-726
Number of pages10
JournalOikos
Volume122
Issue number5
DOIs
Publication statusPublished - May 2013

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    McCarthy, M. A., Moore, J. L., Morris, W. K., Parris, K. M., Garrard, G. E., Vesk, P. A., ... Yue, B. (2013). The influence of abundance on detectability. Oikos, 122(5), 717-726. https://doi.org/10.1111/j.1600-0706.2012.20781.x