Dreissenid veliger dynamics along a nearshore to offshore transect in Lake Michigan

摘要: Abstract Dreissenid mussel veligers compose a substantial component of pelagic biomass in the Great Lakes, yet their dynamics are poorly understood. To evaluate seasonal, spatial, and inter-annual variation veliger density, we used 64-μm mesh plankton net (2008, 2013–2016) 153-μm (2007–2016) to collect dreissenid at nearshore (15–25 m depth), transitional (45 m) offshore (93–110 m) sites southeast Lake Michigan during March–December. We also evaluated trends density recently settled mussels relative abundance standing stock adult mussels. Veliger peaked both summer fall all sites, but peak densities were generally higher nearshore, whereas offshore. The was overall 28% that net, there high variability this comparison among months. Smaller much more abundant little difference size distribution between nets for 210–300 μm classes. Thus, could still be useful tool assessing larger just prior settlement. Newly (≤2 mm) most or nearly absent site despite there. Factors other than must play an important role recruitment.