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- W2004103256 abstract "Rotifers were the most dominant herbivores in Lake Ontario in 1970 and 1982. In 1982, they accounted for 65 to 80% of the total zooplankton biomass collected with 64-μm plankton nets and were two to three times higher in abundance when collected on 30-μm screens. The composition of rotifers changed between 1970 and 1982. In 1970, Synchaeta and Keratella were more abundant than Polyarthra and “other rotifers” (mainly Conochilus and Trichocera) as a group. In 1982, the order of abundance shifted to “other rotifers” predominating followed by Keratella and Polyarthra. Synchaeta was virtually absent. In the mesozooplankton group (> 200 μm), the cyclopoid copepod (Diacyclops thomasi) contributed 50 to 60% of mesozooplankton abundance in 1970, but this increased to 90% in 1982. Large herbivores like Daphnia, Ceriodaphnia and Diaptomus were common only during September and October in 1982, but in 1970 they were abundant during July through October. From these observations, we developed a tentative foodweb model for 1982 which suggests that energy is inefficiently transferred from the primary producers to piscivorous fish. Algae are consumed principally by rotifers which are eaten by cyclopoid copepods that are food for mysids. Planktivorous fish eat mysids and other zooplankton and play a pivotal role in controlling not only the structure of zooplankton community but also provide the principal food for the rapidly growing salmonid population. The validity of previous foodweb models of Lake Ontario is questionable because the models were based only on crustacean zooplankton which constituted less than 25% of the zooplankton biomass." @default.
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- W2004103256 date "1992-01-01" @default.
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- W2004103256 title "Dominance of Small Filter Feeding Zooplankton in the Lake Ontario Foodweb" @default.
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- W2004103256 doi "https://doi.org/10.1016/s0380-1330(92)71311-2" @default.
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