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Providing evidence to improve practice

Individual study: Invasive species shifts ontogenetic resource partitioning and microhabitat use of a threatened native amphibian

Published source details

D’Amore A., Kirby E. & McNicholas M. (2009) Invasive species shifts ontogenetic resource partitioning and microhabitat use of a threatened native amphibian. Aquatic Conservation: Marine and Freshwater Ecosystems, 19, 534–541


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Remove or control invasive bullfrogs Amphibian Conservation

A replicated, before-and-after study in 2004–2007 of 12 ponds in California, USA (D’Amore, Kirby & McNicholas 2009) found that there was a significant increase in adult California red-legged frogs Rana draytonii in ponds in the two years after American bullfrog Rana catesbeiana removal. Counts increased from eight to 11 frogs in removal ponds. Numbers did not change in control ponds. Adult frogs were less visible when bullfrogs were present. Frogs used willows significantly less as cover, and were found on bare shores twice as much when adult bullfrogs were absent. Invasive American bullfrogs were removed from 12 ponds in 2004–2007. They were captured by hand, Hawaiian slings (spears) and seine netting (for tadpoles). Six ponds without bullfrogs in an adjacent field were monitored for comparison. Amphibians were monitored three times each week until October 2007.