Individual study: Anuran call surveys on small wetlands in Prince Edward Island, Canada restored by dredging of sediments
Stevens C.E., Diamond A.W. & Gabor T.S. (2002) Anuran call surveys on small wetlands in Prince Edward Island, Canada restored by dredging of sediments. Wetlands, 22, 90-99
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A replicated, controlled study in 1998–1999 of 22 restored wetlands on Prince Edward Island, Canada (Stevens, Diamond & Gabor 2002) found that restored wetlands had significantly higher numbers of amphibian species than non-restored wetlands (2.7 vs 1.8). All five species present on the islands were recorded in both wetland types. Abundance was significantly higher in restored wetlands for spring peeper Pseudacris crucifer (2.7 vs 2.1), northern leopard frog Rana pipiens (0.5 vs 0.2) and green frog Rana clamitans (0.7 vs 0.2). There was no difference in abundance of wood frog Rana sylvatica or American toad Bufo americanus in restored and non-restored wetlands. Wetlands were 0.3–0.6 ha and had been restored by dredging (30–95% of area) two to seven years before the study. Amphibians were monitored at 22 dredged and 24 undredged wetlands during monthly call surveys in May-July 1998 and/or 1999.