Annual production by a stream brook charr population and by its principal invertebrate food |
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Authors: | Thomas F. Waters |
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Affiliation: | (1) Department of Entomology, Fisheries, and Wildlife, University of Minnesota, St. Paul, Minnesota 55108, USA |
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Abstract: | Synopsis Annual production by the brook charr (Salvelinus fontinalis) population in Valley Creek, Minnesota, over the five-year period 1968–1972, was closely correlated to production by its main invertebrate food, Gammarus pseudolimnaeus, which had been reduced by siltation. Annual production was 163–191 kg ha–1 (wet weight) in 1968–1969, respectively, and then dropped to a mininum of 79 kg ha–1 in 1971, the year most seriously affected by decreased invertebrate production and siltation; year-class strength, standing stock, and total year-class (cohort) production followed approximately the same pattern. Total year-class production was highest for the 1968–1969 year classes at 211–178 kg ha–1, respectively, and lowest for the 1971 year class at 76 kg ha–1. Annual P/B ratios ranged from 1.0 to 1.9; cohort P/B ratios, for the 1968–1972 year classes, ranged from 5.6 to 7.2.Paper No. 11,384, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul, Minnesota 55108, U.S.A. |
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Keywords: | Stream fishes Cohort production Benthos production Fish production Salvelinus fontinalis Gammarus pseudolimnaeus Siltation P/B ratio Valley Creek |
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