Action: Translocate wood frogs
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- Two studies (including one replicated study) in the USA found that translocated wood frog eggs established breeding populations in 25–50% of created ponds.
- One replicated study in the USA found that translocated wood frog eggs hatched and up to 57% survived as tadpoles in enclosures in restored ponds.
Supporting evidence from individual studies
A before-and-after study in 1965–1986 of two created ponds in Missouri, USA (Sexton & Phillips 1986) found that translocated wood frog Rana sylvatica eggs established a breeding population in one of two created ponds. At the second pond wood frogs did not establish. In 1980, wood frog eggs were translocated to two newly constructed ponds. Ponds were monitored until 1986.
A replicated, before-and-after study in 1974–1995 in Missouri, USA (Sexton et al. 1998) found that one of four wood frog Rana sylvatica egg translocations established a breeding population. The population was stable between 1987 (311 captured) and 1995 (364). Wood frogs also colonized four other created ponds (0.9–2.4 km). In 1980, 11 wood frog egg masses were translocated 50 km into four created ponds. Monitoring was undertaken using drift-fencing with pitfall traps around ponds and by egg mass counts and call surveys.
A replicated study in 2005–2008 in a restored forested wetland in Lake County, Illinois, USA (Sacerdote 2009) found that translocated wood frog Lithobates sylvaticus eggs hatched and survived as tadpoles in enclosures in restored ponds. Tadpole survival in restored ponds was 6–57%. In 2008, two translocated wood frog egg masses were placed in separate mesh enclosures (56 x 36 x 36 cm) in each of five restored ponds. Tadpoles were monitored 2–3 times/week until metamorphosis. Tadpoles were moved if ponds dried.
- Sexton 0.J. & Phillips C. (1986) A qualitative study of fish-amphibian interactions in 3 Missouri ponds. Transactions of the Missouri Academy of Science, 20, 25-35
- Sexton O.J., Phillips C.A., Bergman T.J., Wattenberg E.W. & Preston R.E. (1998) Abandon not hope: status of repatriated populations of spotted salamanders and wood frogs at the Tyson Research Center, St.Louis County, Mo 1998. Pages 340-344 in: Status and Conservation of Midwestern Amphibians. Universiity of Iowa Press, Iowa City, Iowa.
- Sacerdote A.B. (2009) Reintroduction of extirpated flatwoods amphibians into restored forested wetlands in northern Illinois: feasibility assessment, implementation, habitat restoration and conservation implications. PhD thesis. Department of Biological Sciences. Northern Illinois University.