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Biology and production of mass chironomid species in the Rybinsk Reservoir
Authors:G. Kh. Shcherbina
Affiliation:1. Papanin Institute of the Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, 152742, Russia
Abstract:The biology, distribution and production of the following four mass species of chironomids from the shallow zone of the Rybinsk Reservoir are studied: Chironomus agilis Shobanov et Djomin, Ch. muratensis Ryser et al., Lipiniella araenicola Shilova, and Stictochironomus crassiforceps (Kieffer). Although these species differ greatly in life cycles, production, trophic states of habitats, duration, and rate of growth, their average P/B aver coefficient values vary inconsiderably from 2.9 to 3.4; P/B max varies from 1.4 to 1.6. Mean values of P/B aver of 3.0 and of P/B max of 1.5 are recommended for calculating the production of monocyclic chironomid species in fresh waters while determining the fish productivity of a waterbody or assessing losses associated with dredging.
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