Predatory impact of the mosquitofish (Gambusia holbrooki Girard) on zooplanktonic populations in a pond at Tenuta di Castelporziano (Rome, Central Italy)

Fiorenza G. MARGARITORA, Ornella FERRARA, Daria VAGAGGINI
  • Ornella FERRARA
    Affiliation not present
  • Daria VAGAGGINI
    Affiliation not present

Abstract

A study of a permanent pond located in a nature reserve in Central Italy was carried out over two periods (1985-87; 1995-98) to determine the structure and dynamics of planktonic biocoenosis. The composition of the zooplankton community was quite different in the two periods of study: in the first period, rotifers, small-bodied cladocerans and larval copepods were the dominant groups; in the second there was a shift from rotifers and microcrustaceans to dominance by large-bodied Daphnidae and adult copepods. The possibility is stressed that Gambusia holbrooki, present in 1985 and absent in 1995, may be responsible for the changes in the planktonic community.

Keywords

zooplankton, fish predation, Gambusia holbrooki, pond

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Submitted: 2011-12-09 12:32:19
Published: 2001-08-01 00:00:00
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