Individual study: Plant diversity and species richness decreased and waterfowl and amphibian communities stayed the same as wetlands matured over 12 years in Wisconsin, USA
Nedland T.S., Wolf A. & Reed T. (2007) A reexamination of restored wetlands in Manitowoc County, Wisconsin. Wetlands, 27, 999-1015
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A replicated study in 1992–2004 of 16 restored wetlands in Wisconsin, USA (Nedland, Wolf & Reed 2007) found that amphibian communities stayed the same as wetlands matured over 12 years. The six amphibian species and overall amphibian abundance did not change between 1992 and 2004 (13–14 calls/wetland). Overall wetland species and coefficients of conservation values increased over time (coefficient: 3.6 vs 3.9). Restoration occurred between 1988 and 1991. Amphibians were monitored at eight wetlands. Four amphibian call surveys were undertaken at each in April–July. Plants and birds were also monitored.