Individual study: Amphibian biodiversity recovery in a large-scale ecosystem restoration
Brodman R., Parrish M., Kraus H. & Cortwright S. (2006) Amphibian biodiversity recovery in a large-scale ecosystem restoration. Herpetological Conservation and Biology, 1, 101-108
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A before-and-after study in 1998–2003 of a wetland landscape restoration project at Kankakee Sands, Indiana, USA (Brodman et al. 2006) found that numbers of amphibian breeding populations increased from 14 to 172 and species richness from seven to 10, three years after restoration began. Prior to restoration in 1998, there were 14 populations of seven species at seven breeding sites (> 200 m apart). By 2000, this increased to 33 populations of seven species at 14 sites and by 2003, 172 populations of 10 species at 44 sites. Average species richness/site increased from two in 1998 to four in 2003. Species became significantly more common and breeding occurred in every land management unit (vs 50% in 1998). However, apart from in wetter than average years (2002 and 2003), restored wetlands dried before larvae of most species metamorphosis. Restoration began in 1999 and comprised plugging and filling ditches, breaking drainage tiles and recontouring basins. Amphibians were monitored at restored and natural wetlands in April–July 1998, 2000–2003. Call surveys (3/year), seines, dip-nets, minnow traps (each 2/year), terrestrial searches and drift-fences with funnel traps were used.