J. F. Ocock, A. Walcott, J. Spencer, S. Karunaratne, R. F. Thomas, J. T. Heath, D. Preston
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Managing flows for frogs: wetland inundation extent and duration promote wetland-dependent amphibian breeding success
Context
River regulation is a key threat to amphibian communities that continue to face global declines. Prior work in regulated river catchments has indicated that wetland inundation from connecting river flows supports breeding in some frog species more than others.
Aims
Our aim was to identify flow metrics influencing breeding and recruitment success in flow-dependent frogs, to derive flow–ecology relationships.
Methods
We conducted repeat surveys of frog communities between 2015 and 2020 across two important wetlands in the northern Murray–Darling Basin, Australia. Using random forest analyses, we investigated the influence of 22 explanatory variables on breeding activity and success.
Key results
Inundation extent was the most important driver of calling activity by flow-dependent species (increasing breeding attempts), whereas the volume of river flows in the preceding months was most important for increasing breeding success.
Conclusions
Two key features of the flow pulse are linked to breeding success for amphibians in floodplain wetland systems: (1) the size of the pulse as it relates to area of wetland inundated; and (2) the duration of connecting flows as a measure of wetland duration.
Implications
By establishing amphibian flow–ecology relationships, these species can be included in governmental environmental water objectives and management.
期刊介绍：
Marine and Freshwater Research is an international and interdisciplinary journal publishing contributions on all aquatic environments. The journal’s content addresses broad conceptual questions and investigations about the ecology and management of aquatic environments. Environments range from groundwaters, wetlands and streams to estuaries, rocky shores, reefs and the open ocean. Subject areas include, but are not limited to: aquatic ecosystem processes, such as nutrient cycling; biology; ecology; biogeochemistry; biogeography and phylogeography; hydrology; limnology; oceanography; toxicology; conservation and management; and ecosystem services. Contributions that are interdisciplinary and of wide interest and consider the social-ecological and institutional issues associated with managing marine and freshwater ecosystems are welcomed.
Marine and Freshwater Research is a valuable resource for researchers in industry and academia, resource managers, environmental consultants, students and amateurs who are interested in any aspect of the aquatic sciences.
Marine and Freshwater Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
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