Chironomid Larval Density at Various Depths in a Southern California Water-Percolation Reservoir 1

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Abstract
In a southern California reservoir, benthic larval density of chironomid midges was assessed 10 times between Aug. 1974 and July 1975, at >1 m, 3–4 m, and 6–8 m water depths. Larvae belonging to 9 midge genera were taken. Tanytarsus spp., Chironomus spp., and Procladius spp. were predominant, forming more than 85% of the total chironomid larvae recovered on any sampling occasion from the entire basin. The monthly qualitative composition of midge fauna differed slightly between the 3 depth levels, but the quantitative composition changed markedly from one level to the next. Midge density was consistently higher in the >1 m deep areas than in the 3–4 m and the 6–8 m deep levels. Tanytarsus spp. were predominant at the >1 m depths. Chironomus spp. and Procladius spp. were more prevalent in the other 2 deeper regions.

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