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Spatial Variation In Density, Mean Size And Physiological Condition Of The Holarctic Amphipod Diporeia Spp. In Lake Michigan, Thomas F. Nalepa, David J. Hartson, Jennifer Buchanan, Joann F. Cavaletto, Gregory A. Lang, Stephen J. Lozano

United States Department of Commerce: Staff Publications

1. We examined spatial patterns in population characteristics (density, biomass, mean body length) and physiological condition (lipid content, length-weight) of the amphipod Diporeia spp. in Lake Michigan by collecting samples at up to 85 sites in late summer 1994 and 1995. Variables were examined relative to water depth and three lake regions: south, central and north. Most major river systems are found in the south, and this region is more nutrient-enriched compared to the north.

2. Over all sites, mean density was 5240 m^-2, biomass was 4.1 g dry wt m^-2, and mean body length was …