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

Iheringia. Série Zoologia

Federico Quintans²  Flavio Scasso²  Marcelo Loureiro¹  Alejandro Yafe¹ 

[1] ,Universidad de la República Faculty of Sciences Limnology SectionMontevideo,Uruguay

关键词: Fish feeding;    facultative planktivores;    eutrophication;    Alimentación de peces;    planctívoros facultativos;    eutrofización;   

DOI  :  10.1590/S0073-47212009000100014

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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