Successful restoration of water level and surface area restored migrant bird populations in a Hungarian wetland |
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Authors: | József Gyurácz Péter Bánhidi and András Csuka |
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Institution: | (1) Institute for Environmental Studies, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands |
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Abstract: | Water level and water surface area fluctuations are important factors determining abundance of bird populations and bird assemblages
structure in a wetland habitat. The water level and water surface area of the Marsh T?m?rd (West Hungary) changed drastically
between 1998 and 2008, and the marsh dried out because of scarce rainfall in 2000 and 2001. A habitat restoration in winter
2001 repaired the waterholding capacity of the marsh. We analyzed changes in parameters of bird assemblages in investigated
wetland area in relation of environmental factors. We used full redundancy analysis (RDA) on number of caugth migratory birds
per year, species richness, diversity and evenness of bird assemblages to examine correlations among water level, water surface
area and vegetation core. Species like water rail, common snipe, river warbler, Savi’s warbler, great reed warbler, reed warbler,
marsh warbler, sedge warbler, reed bunting showed high and positive linear correlations with the water level and water surface
area in the postbreeding period. Some wetland species, sedge warbler, Savi’s warbler and reed bunting as well as total number
of caugth birds per year and total numbers of caugth species per year were clearly associated with thick marsh vegetation.
According to our results the bird species composition of the wetland might have returned to the prerestoration levels and
surface areas. |
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