Relations among zooplankton abundance, biomass, community structure, and lake trophic state in selected Midwestern waterbodies
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"The objectives of this study were to describe abundance, biomass, and community structure of zooplankton in selected midwestern waterbodies and to evaluate several of the accepted empirical generalizations concerning the response of zooplankton communities to lake trophic state with data from midwest waterbodies. The empirical generalizations examined in this thesis are that as lakes become more productive: (1) total zooplankton abundance increases (Brooks 1969; Patalas 1972; Patalas and Saiki 1973; O ’Brien and de Noyelles 1974; Beaver and Crisman 1982) ; (2) total zooplankton biomass increases (McCauley and Kalff 1981; Mills and Schiavone 1982; Hanson and Peters 1984; Yan 1986); (3) ecological efficiency by which energy is transfered from the primary producers to the zooplankton decreases (Hillbricht-Ilkowska et al. 1972, as cited in Pederson et al. 1976; McCauley and Kalff 1981); (4) zooplankton mean length shifts toward smaller individuals (Brooks 1969; McNaught 1975); and (5) large grazing zooplankton can potentially reduce the amount of chlorophyll a per unit of total phosphorus (Edmondson and Litt 1982; Pace 1984; Shapiro and Wright 1984)."--Page 2.
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