Emergence of Chironomidae from Findley Lake and two ponds in the Cascade Mountains,U.S.A. |
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| Authors: | Truman Sherk Greg Rau |
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| Institution: | (1) Department of Zoology and College of Forest Resources, University of Washington, 98195 Seattle, Washington, U.S.A.;(2) Present address: P.O. Box 331, 06405 Branford, Connecticut, U.S.A.;(3) Present address: Institute of Marine Sciences, University of California, 95064 Santa Cruz, California, U.S.A. |
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| Abstract: | From Findley Lake and two ponds in the Cascade Mountains (U.S.A.) Chironomidae started to emerge as soon as the ice thawed in 1972 and 1973. The 1051 Chironomidae that emerged per m2 from Findley Lake included 307 individuals ofTanytarsus and 358 ofProcladius. Tanytarsus outnumberedChironomus at all depths from 0 to 19.3 m. The 1506 Chironomidae that emerged per m2 from the 4.5 m deep pond included 997 individuals ofTanytarsus. The 1490 Chironomidae that emerged per m2 from the 2 m deep pond included 1363 Tanytarsus. The emerging biomass was 216 and 186 mg dry weight per m2 in Findley Lake and the 4.5 m deep pond, respectively, and only 78 mg in the 2 m deep pond. Most species had their maximum emergence where there was organic detritus from the surrounding forest.Orthocladius emerged from sand bottom at 2.7 to 5.2 m depth.Stictochironomus emerged from mud and sand at 8.4 m depth.Chironomus emerged from soft mud at 15 to 27.5 m depth. |
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| Keywords: | emergence chironomids U S A |
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