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The Summer Standing Crop, Growth And Distribution Of Chironomus Plumosus, In Lake Itasca, Minnesota, James C. Underhill, Gerald A. Cole
The Summer Standing Crop, Growth And Distribution Of Chironomus Plumosus, In Lake Itasca, Minnesota, James C. Underhill, Gerald A. Cole
Journal of the Minnesota Academy of Science
During the period 15 June to 3 September 1965, 626 Ekman dredge hauls were made in Lake Itasca, Minnesota. The numbers and weights of Chironomus plumosus L. at 6 m, 7 m, 8 m, Siefert's Hole (9.5 - l 0.4 m), and Peace Pipe Vista (11.5 - 13.7 m) depression were determined. In addition, the numbers and weights of several other benthic dipteran larvae, Cryptochironomus, Palpomyia, and Procladius, normal associates of C. plumosus, were determined. A loss of 98,407 larvae/ha/day occurred in the 6-9 m stratum during the 12 weeks. There was a decrease in numbers of larvae of 79.3% …