Demography and ecological impacts of the invading mollusc Dreissena polymorpha

摘要: The bivalve mollusc Dreissena polymorpha colonized Lake St. Clair in 1986 as a result of ballast water discharge. present study shows that since initiating reproduction 1988, its population density at all the sites originally has increased more than 1000-fold. species has, well, expanded range dramatically. and increase is not yet complete, populations most remain dominated by juveniles. Densities excess 5000 individuals/m2 seem likely to be achieved within 5 years. It appears D. will have significant impact on composition benthos. Shells individual unionids carry 10 000 polymorpha, lipid reserves such are only half those unaffected individuals. Aside from direct interactions with benthic organisms, filtering activity may sufficient turbidity o...