Population parameters of Pleopis polyphemoides (Crustacea, Cladocera) in a tropical bay |
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| Authors: | Andrea Marazzo Jean Louis Valentin |
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| Institution: | Laboratório de Zooplâncton, Departamento de Biologia Marinha, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Ilha do Fundao, Rio de Janeiro, RJ 21949-900, Brazil |
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| Abstract: | Populations of Pleopis polyphemoides were studied in Guanabara Bay, southeastern Brazil, to assess temporal variations in density and population parameters. The abundance of P. polyphemoides varied widely during summer, and collapsed in fall–winter. These variations probably resulted from the combined effects of water temperature and predation pressure. It is assumed that the planktonic population began by hatching from resting eggs, while the collapse of the planktonic population in April seemed to be related to lower temperatures and high densities of predatory chaetognaths. |
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| Keywords: | zooplankton marine cladocerans Pleopis polyphemoides population dynamics short-term variations tropical bay Guanabara Bay Brazil |
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