Individual study: Rehabilitation of a heavily modified river section of the Danube in Vienna (Austria): biological assessment of landscape linkages on different scales
Chovanec A., Schiemer F., Waidbacher H. & Spolwind R. (2002) Rehabilitation of a heavily modified river section of the Danube in Vienna (Austria): biological assessment of landscape linkages on different scales. International Review of Hydrobiology, 87, 183–195
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Create ponds for amphibians
A continuation of a before-and-after study (Chovanec et al. 2000) of nine created inshore zones and ponds and restructured shoreline of the constructed Danube Island, Austria (Chovanec et al. 2002) found that in the first two years, 10 of 12 species found on the island colonized and bred in most of the inshore water bodies. Eight species were recorded in the first year and an additional two were found in the second year. Common toad Bufo bufo disappeared in the second year. Green toad Bufo viridis was found at six sites in 1998 but due to successional processes in 1999 it was only found at three sites. Numbers of species and breeding species remained higher at inshore sites compared to those connected to the Danube River. Monitoring was undertaken during 20–32 visits in 1998 and 16–39 visits in 1999 by visual surveys, audio strip transects and hand-netting.