The Stonefly Isoperla bilineata in Lake Superior

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Large numbers of nymphs of the stonefly Isoperla bilineata were found on gill nets set on the bottom off the west shore of the Keweenaw Peninsula in May, 1978. A fisherman said they were common there every year, but extensive Ponar grab sampling in the area in 1974 yielded no stoneflies. Similar sampling experience in the Apostle Islands by Selgeby (1974) suggests that grab samplers do not capture this species. Observations of stonefly nymphs on gill nets at three well-separated locations indicate a wide distribution of this species in Lake Superior. © 1980, International Association for Great Lakes Research. All rights reserved.

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Journal of Great Lakes Research