Synopsis
Following the introduction of roach, Rutilus rutilus, to a large eutrophic lake in ca. 1973, a subsequent increase in the abundance of this cyprinid through the 1970s was accompanied by a decline in the numbers of one of the lake’s most abundant overwintering waterfowl, the tufted duck, Aythya fuligula, and an increase in overwintering piscivorous great crested grebes, Podiceps cristatus. We suggest that these contrasting trends are causally related and that competition for benthos and increased prey availability are the mechanisms responsible for the changes in the tufted duck and grebe populations respectively. In agreement with these hypotheses, a reduction in the roach population during the mid 1980s was accompanied by a recovery of tufted ducks and a decline of grebes.
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Winfield, I.J., Winfield, D.K., Tobin, C.M. (1992). Interactions between the roach, Rutilus rutilus, and waterfowl populations of Lough Neagh, Northern Ireland. In: Wieser, W., Schiemer, F., Goldschmidt, A., Kotrschal, K. (eds) Environmental biology of European cyprinids. Developments in environmental biology of fishes, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2544-4_18
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