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SPATIAL VARIATION IN DENSITY, MEAN SIZE, AND PHYSIOLOGICAL CONDITION OF THE HOLARCTIC AMPHIPOD DIPOREIA SPP. IN LAKE MICHIGAN
Citation:
Nalepa, T. F., D. J. Hartson, J. Buchanan, J. F. Cavaletto, AND S J. Lozano. SPATIAL VARIATION IN DENSITY, MEAN SIZE, AND PHYSIOLOGICAL CONDITION OF THE HOLARCTIC AMPHIPOD DIPOREIA SPP. IN LAKE MICHIGAN. FRESHWATER BIOLOGY 43:107-119, (2000).
Description:
We examined spatial patterns in population characteristics and physiological condition 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.... Lipid content, weight per unit length, and mean length declined with decreased water depth, but depth-related trends were most evident in the south. . . Mean lipid content and weight per unit length of Diporeia in the south were lower than values found in the late 1980s prior to the establishment of Dreissena. Mean lipid content of mature individuals is now at levels considered a minimum for successful reproduction.