The relationship between water velocity,energetic costs,and microhabitat use in four North American stream fishes |
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Authors: | D E Facey G D Grossman |
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Institution: | (1) Department of Zoology, University of Dublin, Trinity College, Dublin 2, Ireland |
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Abstract: | Freshwater crayfish are key members of aquatic communities due to their large size and abundance. Although most commonly regarded
as herbivores and detritivores, they are also selective predators. The crayfish plague fungus Aphanomyces astaci (Schikora) led to the elimination of a stock of white-clawed crayfish, Austropotamobius pallipes (Lereboullet) from Lough Lene, Co. Westmeath, in 1987. Samples taken of the flora and benthic communities of two Irish lakes,
one (Lough Bane) formerly containing crayfish and the other (Lough Lene) immediately following a plague outbreak, were compared
to similar samples taken a year later and ecological shifts were noted and compared to laboratory feeding results. Over time,
Chara strands increased in mean length, and molluscs became more abundant. |
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Keywords: | Crayfish Austropotamobius Chara grazing vegetation |
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