Ref ID : 6628
Karen Jenderedjian; Energy budget of Oligochaeta and its relationship with the primary production of Lake Sevan, Armenia. Hydrobiologia 334:133-140, 1996
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From 1928 to 1991 the following oligochaete enegy budget quantitative values: biomass (B), production (P), respiration (R), assimilation (A), ration (C) changed 8 to 12 times. With increasing depth the ratios of enegy budget decreased: P/B ratio from 3.4 to 0.1, R/B ratio from 4.5 to 0.5, net production efficiency from 43 to 18%. A relationship was revealed between oligochaete biomass and the primary production (PP) of the lake. There is a delay in the response in oligochaete biomass to primary production. In Lake Sevan the 'delay' is 2 years in the littoral, 4 years in the sublittoral and 11 years in the profundal zone. The closest correlation was revealed between oligochaete enegy budget quantitative values and the values of primary production of the preceding 10 years, which enables a prediction of the quantitative indices of the community of Oligochaeta. The values of enegy budget ratios depend on temperature and oxygen regimes but not on the trophic status of the reservoir and were comparatively stable during the observed period.