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    <dct:description>Wetland habitat loss is a significant threat to marshbird populations Tacha and Braun 1994. Declines in Virginia rails Rallus limicola 2.2 annually from 1982 to 1991 and soras Porzana carolina 3.3 annually from 1966 to 1991 are proportional to wetland habitat loss during the same period Conway et al. 1994. A common management technique to offset wetland habitat loss is the impoundment of aquatic areas to lengthen the duration of wetland flooding for waterfowl use Frederickson and Taylor 1982, Greer et al. 2007. Impoundment management generally increases inundation duration during the summer or varies water levels in early spring or late fall to increase seed production for waterfowl consumption Frederickson and Taylor 1982. We identified the mechanisms of nest failure nestscale, reproductive success wetlandscale,and rail density wetlandscale and also compared hydrologic variation and railproductivity on wetlands with and without waterfowlmanagement impoundments.</dct:description>
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