Spread and distribution pattern of Sinanodonta woodiana in Lake Balaton

摘要: The exotic Chinese pond mussel (Sinanodonta woodiana ) is the biggest bivalve in Europe, it was first reported from Lake Balaton 2006. In 2011 summer relative abundance and biomass of S. native unionids were recorded at 21 sampling sites, order to analyse speed dispersion reveal its possible ecological impacts on unionids. GPS coordinates sites recorded, spatial distribution data shows that high abundances are characteristic along northern shore lake. western part lake, Keszthely Basin, may amount as much 50–80% total unionid biomass. this basin, comparing these measured 1992/93, impact seems high, A. cygnea has been replaced by ratio anatina reduced 17.8% 8.6%. Taking into consideration so rapidly developed close supposed source introduction a spread potential future increase population size (and dominance) can be expected.