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1 Polish Journal of Ecology

1 2007

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Sinanodonta woodiana (Lea, 1834) (Mollusca) - a new mussel species in Poland: occurence and habitat preferences in a heated lake system

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Kraszewski A. , Zdanowski B.

tom Vol. 55, nr 2

337-356

In the mid 1980s the southeast Asian mussel Sinanodonta woodiana (Lea, 1834) was introduced into a lake system that is heated by power plant discharge waters (near Konin in central Poland) along with fish stocking material from Hungary. Currently, this species is abundant in the littoral zones of the five lakes in the system, the initial water cooling reservoir, as well as most of the intake and discharge canals. This species prefers a habitat with a moderate water flow rate (0.05-0.30 m s[^-1]) and a relatively high water temperature (10-30 [degree]C), and it usually forms aggregations. It avoids strong water turbulence and coarse sediments, although it does occur sporadically in the direct vicinity of water intake pumps and water discharge as well as on gravel substrates. The largest aggregation of Sinanodonta woodiana occurred at depths of 1.5-2.5 m. The highest number and biomass of this species was noted in the discharge canal and initial cool.ing reservoir where the water was thee warmest. Population density sometimes exceeded 60 ind m[^-2], while mussel biomass (including the shell) reached as much as 25 kg m[^-2].