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The spatial distribution and long-term dynamics of occurrence and abundance, as well as features of the seasonal life cycle of two species of Cladocera, an alien species D. orghidani and a native species D. brachyurum, were studied in 2005–2011 in the Rybinsk reservoir. It was found that, during a seven-year period, the successful coexistence of the species is favored by the differences in a seasonal...
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