Study

Population monitoring and recovery of the northern leopard frog (Rana pipiens) in southeast British Columbia

  • Published source details Adama D.B. & Beaucher M.A. (2006) Population monitoring and recovery of the northern leopard frog (Rana pipiens) in southeast British Columbia. Columbia Basin Fish and Wildlife Compensation Program, Nelson, B.C. report, 28pp.

Actions

This study is summarised as evidence for the following.

Action Category

Head-start amphibians for release

Action Link
Amphibian Conservation
  1. Head-start amphibians for release

    A replicated study in 2000–2005 at two wetlands in British Columbia, Canada (Adama & Beaucher 2006) found that captive-reared and released northern leopard frog Rana pipiens tadpoles and metamorphs survived over winter and bred successfully. At one site, seven juveniles, three adults and 13 unmarked young of the year were recorded the year after release. At the other site three egg masses and numerous young-of-year were recorded in one area, but no frogs were caught in the second area. In 2005, population estimates for young of the year/site were 1,361 and 3,874 respectively. Wild young were significantly larger than captive-reared young in all but two years (13 vs 8 g). Average survival in captivity was 82%. An increased protein diet resulted in increased size at metamorphosis and decreased time to metamorphosis (reduced 75 days). In 2001–2005, 30,065 hatchlings from 27 egg masses were collected and reared in captivity. In total, 10,147 tadpoles and 14,487 metamorphs were marked and released back to the source population and at two restoration sites. Monitoring was undertaken using visual encounter and call surveys.

     

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust