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- Publisher
- CSIRO Publishing
- Copyright
- Copyright © The Author(s). Published by CSIRO Publishing
- ISSN
- 0004-959X
- eISSN
- 1446-5698
- DOI
- 10.1071/ZO20101
- Publisher site
- See Article on Publisher Site
Abstract
Population monitoring is required to guide conservation programs. We conducted a capturemarkrecapture study of a population of the vulnerable green and golden bell frog (Litoria aurea) at the northern end of its range. Frogs were captured and marked over three breeding seasons (2015/16, 2016/17, 2017/18) in a large coastal lagoon. We aimed to: (1) produce annual estimates of population size to describe population trajectory, and (2) investigate monthly variation in abundance, capture probability, and temporary emigration to understand how these factors change at a finer temporal scale. Frog abundance varied across the three annual breeding seasons: 60280 adult males, 120190 adult females, and 90420 subadults. We infer that the population is stable because adult abundance estimates were higher after 2015/16. Because our study sampled only half the available breeding habitat, the overall population may number 350850 adults. Our modelling revealed >40 males but <20 females were detected in the sample area in our monthly samples. Estimates of temporary emigration were high (males: 0.54 females: 0.79), suggesting behaviour that made frogs unavailable for capture between months. Our results suggest that monitoring at greater than annual intervals should be adequate to monitor the future trend of this population.
Journal
Australian Journal of Zoology – CSIRO Publishing
Published: Jul 13, 2021