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Three new interstitial dorvilleids (Annelida: Polychaeta) from the Cymodocea nodosa meadows of the Canary Islands
Authors:María del Carmen Brito  Jorge Núñez
Institution:(1) Department of Biology, University of Minnesota Duluth, Duluth, MN, 55812, U.S.A.;(2) Fisheries Research Institute, P.O. Box 343, Jinja, Uganda
Abstract:Resource–consumer relationships in Lake Victoria were investigated by use of stable isotope data. delta13C and delta15N signatures were determined for organisms at a deep (22 m) and a littoral (5 m) site in the Napoleon Gulf near Jinja, Uganda. Results suggest that two food chains operate at the deep site, one leading from a shrimp (Caridina nilotica) to juvenile Nile perch (Lates niloticus), the second leading from zooplankton (copepods and cladocerans) to a cyprinid (Rastrineobola argentea) and lake flies (Chaoborus). Isotopic evidence suggests that shrimp eat suspended particulates and benthos, not crustacean zooplankton or water hyacinth (Eichhornia crassipes). Resource–consumer relationships revealed in this study have implications for understanding future yields of the economically important Nile perch fishery.
Keywords:Lake Victoria  Caridina nilotica  Lates niloticus  stable isotopes
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