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THE STATUS OF DIPOREIA SPP. IN LAKE ONTARIO, 1994-1997
Citation:
Lozano, S J. AND J. V. Scharold. THE STATUS OF DIPOREIA SPP. IN LAKE ONTARIO, 1994-1997. The Lake Whitefish-Diporeia Workshop, Ann Arbor, MI, February 26 - 27, 2002. Great Lakes Fishery Commission, Ann Arbor, MI, 233-246, (2003).
Impact/Purpose:
To explore the causes of population densities and biomass in Diporeia spp.
Description:
Surveys of microinvertebrates conducted in Lake Ontario between 1994 and 1998 revealed a recent decline in Diporeia spp. (Amphipoda) abundance. The lowest population densities and summer biomass are located in the eastern basin of the lake at all depths. Densities and biomass declined in the shallowest (10-50 m) depth zone between 1994 and 1998...The shift of total biomass from shallow to deeper sediments will have a profound effect on organisms that depend upon Diporeia for food. Because of the importance of benthic macroinvertebrates and particularly Diporeia in fish diets, changes in the status of Diporeia could have dramatic effects on fish production in Lake Ontario.