Predator-free short-hydroperiod wetlands enhance metamorph output in a threatened amphibian: insights into frog breeding behaviour evolution and conservation management
Chad T. Beranek
A B C , Samantha Sanders A , John Clulow A B and Michael Mahony A
+ Author Affiliations
- Author Affiliations
A School of Environmental and life Sciences, Biology Building, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.
B FAUNA Research Alliance, PO Box 5092, Kahibah, NSW 2290, Australia.
C Corresponding author. Email: chad.beranek@uon.edu.au
Wildlife Research 49(4) 360-371 https://doi.org/10.1071/WR21049
Submitted: 7 March 2021 Accepted: 12 October 2021 Published: 30 October 2021
Journal Compilation © CSIRO 2022 Open Access CC BY-NC-ND
Abstract
Context: Knowledge on the drivers of breeding behaviour is vital to understand amphibian ecology and conservation. Proposed drivers of amphibian reproductive behaviour include selection of optimum water quality, and avoidance of tadpole predators and competition. These hypotheses are underpinned by the logic that amphibians will choose breeding habitat that will result in enhanced metamorph output.
Aims: We aimed to infer key drivers that influence metamorph output in the threatened green and golden bell frog (Litoria aurea). We hypothesised that (1) metamorph output would be higher in recently refilled wetlands than in wetlands with a longer hydroperiod, (2) metamorph output would be negatively correlated with tadpole predator abundance, and (3) waterbodies with long hydroperiods would have higher abundances of aquatic predators and lower abundances of L. aurea tadpoles.
Methods: We tested these hypotheses by monitoring breeding, tadpole and predator abundances in a wild population of L. aurea. We coupled this with metamorph counts that were adjusted to represent per capita numbers via genetic means. We also ruled out the influence of detection probability in explaining the results with a manipulative experiment.
Key results: We found support for all three hypotheses and hence provide evidence that the adaptive behaviour of L. aurea to preference recently refilled wetlands is governed by the abundance of tadpole predators. We found metamorph counts per clutch to be 8.2-fold greater in short-hydroperiod wetlands (26 ± 15–44 95% CI) than in long-hydroperiod wetlands (3 ± 2–5 95% CI). Four predator taxa were associated with low metamorph output and two of these occurred in higher abundances in longer-hydroperiod wetlands.
Conclusions and implications: These results have provided evidence that the behavioural adaptation of L. aurea to select recently refilled wetlands has evolved in response to tadpole predation pressure. We recommend practitioners to conduct tadpole releases in newly refilled wetlands to enhance survival to metamorphosis in future reintroductions.
Keywords: amphibian ecology, wetland hydrology, predation, freshwater macroinvertebrates, tadpoles, reintroduction.
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