Diet of Cnesterodon decemmaculatus (Poeciliidae) and Jenynsia multidentata (Anablepidae) in a hypertrophic shallow lake of Uruguay

Diet of Cnesterodon decemmaculatus (Poeciliidae) and Jenynsia multidentata (Anablepidae) in a hypertrophic shallow lake of Uruguay

Diet of Cnesterodon decemmaculatus (Jenyns, 1842) and Jenynsia multidentata (Jenyns, 1842) were analysed in Lake Rodó, an urban hypertrophic lake from Montevideo, Uruguay. Both species displayed omnivory. The most consumed items for C. decemmaculatus were zooplankton, periphyton, phytoplankton and d...

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Published in:Iheringia. Série zoologia Vol. 99; no. 1; pp. 99 - 105
Main Authors: Quintans, Federico(Universidad de la República Faculty of Sciences Limnology Section), Scasso, Flavio(Universidad de la República Faculty of Sciences Limnology Section), Loureiro, Marcelo(Universidad de la República Faculty of Sciences Vertebrates Section), Yafe, Alejandro(Universidad de la República Faculty of Sciences Vertebrates Section)
Format: Journal Article
Language:English
Portuguese
Published: Fundação Zoobotânica do Rio Grande do Sul 01-03-2009
Subjects:
Alimentación de peces
Anablepidae
Cnesterodon decemmaculatus
eutrofización
eutrophication
facultative planktivores
Fish feeding
Freshwater
Jenynsia multidentata
planctívoros facultativos
Poeciliidae
Uruguay
Uruguay, Rodo L
Uruguay, Montevideo
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Summary:Diet of Cnesterodon decemmaculatus (Jenyns, 1842) and Jenynsia multidentata (Jenyns, 1842) were analysed in Lake Rodó, an urban hypertrophic lake from Montevideo, Uruguay. Both species displayed omnivory. The most consumed items for C. decemmaculatus were zooplankton, periphyton, phytoplankton and detritus; the diet of J. multidentata included zooplankton, insects, crustaceans and juvenile fish. Our results suggest that both species could be acting as facultative planktivores. The fish community of this lake is characterised by the dominance of C. decemmaculatus and J. multidentata. Under this condition, predation on large-bodied zooplankton could indirectly be contributing to maintain a high phytoplankton abundance and a low water transparency. Se analizaron las dietas de Cnesterodon decemmaculatus (Jenyns, 1842) y Jenynsia multidentata (Jenyns, 1842) en el Lago Rodó, un lago urbano hipereutrófico de Montevideo, Uruguay. Ambas especies mostraron un comportamiento omnívoro. Los ítems más consumidos por C. decemmaculatus fueron zooplancton, perifiton, fitoplancton y detritos; la dieta de J. multidentata incluyó zooplancton, insectos, crustáceos y peces juveniles. Estos resultados sugieren que ambas especies pueden actuar como planctívoros facultativos. La comunidad de peces de este lago se caracteriza por la dominancia de C. decemmaculatus y J. multidentata. Bajo esta condición, la depredación sobre el zooplancton de gran tamaño podría indirectamente estar contribuyendo a una alta abundancia de fitoplancton y una baja transparencia del agua.
Bibliography:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000100014&lng=en&nrm=iso&tlng=en
ObjectType-Article-1
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ISSN:0073-4721
0073-4721
DOI:10.1590/S0073-47212009000100014