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10 October 2011 Breeding Chorus Indices Are Weakly Related to Estimated Abundance of Boreal Chorus Frogs
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Abstract

Call surveys used to monitor breeding choruses of anuran amphibians generate index values that are frequently used to represent the number of male frogs present, but few studies have quantified this relationship. We compared abundance of male Boreal Chorus Frogs (Pseudacris maculata), estimated using capture–recapture methods in two populations in Colorado, to call index values derived from automated recordings. Single index values, such as might result from large monitoring efforts, were unrelated to population size. A synthetic call saturation index (CSI), the daily proportion of the maximum possible sum of index values derived from multiple recordings, was greater in larger populations, but the relationship was not highly predictive.

2011 by the American Society of Ichthyologists and Herpetologists
Paul Stephen Corn, Erin Muths, Amanda M. Kissel, and Rick D. Scherer "Breeding Chorus Indices Are Weakly Related to Estimated Abundance of Boreal Chorus Frogs," Copeia 2011(3), 365-371, (10 October 2011). https://doi.org/10.1643/CH-10-190
Received: 8 December 2010; Accepted: 1 May 2011; Published: 10 October 2011
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