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Providing evidence to improve practice

Individual study: Wetland mitigation and amphibians: preliminary observations at a southwestern Illinois bottomland hardwood forest restoration site

Published source details

Mierzwa K.S. (2000) Wetland mitigation and amphibians: preliminary observations at a southwestern Illinois bottomland hardwood forest restoration site. Journal of the Iowa Academy of Science, 107, 191-194


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Restore wetland Amphibian Conservation

A before-and-after, site comparison study in 1995–1998 of a wetland restoration site in St. Clair County, Illinois, USA (Mierzwa 2000) found that by the end of the study, all seven species of amphibians previously found at the site were recorded within the restored area. An eighth species, not present in the adjacent forest, had also colonized the site by 1997. Abundance was higher at the restored site compared to the adjacent forest (5 vs 4 amphibians/man-hour of survey). Restoration of the 95 ha area included removal of low embankments to restore water levels and planting native hardwood trees. Amphibians were monitored at the restoration area and an adjacent forest in May–June 1995–1996. Drift-fences (15 m long) with pitfall and funnel traps at the centre and ends were used. In 1997–1998, visual encounter surveys were carried out twice in March–May.