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• W2020485792 abstract "SUMMARY. 1 A marked gradient in water transparency along the 75 km longitudinal axis of Lake le Roux, a fjord-like reservoir on the Orange River, South Africa, was consistently evident over several years. On average, Secchi depth transparency doubled from approximately 18 cm at the turbid upper end (which is fed by sediment-laden Orange River water discharged from Lake Verwoerd), to 33 cm near the dam wall. A variety of changes in abiotic limn logical attributes (temperature, light attenuation, suspended solids and nutrient levels, etc.), and in the abundance and composition of planktonic biota accompany, and may be imposed by, this turbidity gradient. 2 On average, phytoplankton abundance (assessed as chlorophyll content), and total crustacean zooplankton biomass (per unit volume) were lowest at the very top of the lake, but reached maximal values within 15 km ‘downstream’, reflecting the rapid development of plankton. These variables subsequently declined downstream, in contrast to the apparent improvement in conditions for planktonic existence (increasing water transparency, longer water residence time, etc.). 3 The composition of crustacean zooplankton varied along the length of the reservoir. Both seasonal and inter-annual differences were evident. On average, however, cladocerans (Daphnia, Moina), despite their r-selected attributes, were especially sparse in the more turbid, uppermost reaches, where advective effects of river inflows were most pronounced. The large predatory copepod Lovenula was surprisingly most abundant in this region, where potential planktonic curstacean prey was scarce. The attainment of maximal zooplankton standing slocks some 15 km downstream was attributable to the proliferation particularly of the herbivorous copepod Metadiaptomus, along with minor increases in several ctadoceran components. The latter continued to increase downstream, in line with declining turbidity, although Daphnia and Moina reached their respective abundance maxima in central and lower reaches of the reservoir, reflecting slight disparities in response to turbidity or related gradients. By contrast." @default.
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• W2020485792 date "1990-10-01" @default.
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• W2020485792 title "Zooplankton distribution in relation to turbidity and related environmental gradients in a large subtropical reservoir: patterns and implications" @default.
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• W2020485792 doi "https://doi.org/10.1111/j.1365-2427.1990.tb00706.x" @default.
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