Growth rate of <Emphasis Type="Italic">Daphnia</Emphasis> feeding on seston in a Siberian reservoir: the role of essential fatty acid |
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Authors: | Michail I Gladyshev Nadezhda N Sushchik Olga P Dubovskaya Olesia N Makhutova Galina S Kalachova |
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Institution: | (1) Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia;(2) Siberian Federal University, Svobodny av. 79, Krasnoyarsk, 660041, Russia |
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Abstract: | Specific growth rates (based on biomass increment in unit time) of Daphnia fed natural reservoir seston from a eutrophic Siberian reservoir were studied during four vegetation seasons in a laboratory
flow-through system. Concentrations of particulate C, N, and P in reservoir seston <115 μm were comparatively high, 1.9, 0.2,
and 0.05 mg l−1, respectively; maximum C:P ratio was 259 mol:mol. According to conventional thresholds, concentrations of elements and their
stoichiometry did not limit the growth rate of Daphnia. Eicosapentaenoic acid (EPA) in seston significantly effected the growth rates at concentrations up to ∼13 μg l−1 (regression ANOVAR F-test value was 7.91), but not above this concentration. Thus, we consider this concentration of EPA in seston <115 μm to
be the limiting concentration of EPA for the growth of Daphnia (longispina group), i.e., below this concentration EPA was the best single predictor of the growth of Daphnia. |
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Keywords: | Zooplankton Seston Eicosapentaenoic acid Predictor of growth rate |
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