SciELO - Scientific Electronic Library Online

 
vol.19 número2Características físico-químicas del agua y composición de la ictiofauna del embalse Piedras Moras (Córdoba, Argentina)Asociación y estratificación de la entomofauna cadavérica a diferentes profundidades en el suelo como indicadores complementarios en largos intervalos post mortem índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

  • Não possue artigos citadosCitado por SciELO

Links relacionados

Compartilhar


Revista del Museo Argentino de Ciencias Naturales

versão On-line ISSN 1853-0400

Resumo

GARCIA, Mirta L; SOLARI, Lía C  e  GARCIA DE SOUZA, Javier R. Feeding ecology of the siluriform Pimelodella laticeps Eigenmann, 1917 in a Pampean stream from Argentina. Rev. Mus. Argent. Cienc. Nat. [online]. 2017, vol.19, n.2, pp.211-223. ISSN 1853-0400.

Pimelodella laticeps Eigenmann, 1917 is the most abundant siluriform in the El Pescado Stream, located in the depressed region known as pampean region (Buenos Aires, Argentina). To characterize its feeding habits in this environment, we analyzed the dietary contents on seasonal samplings from May 1991 through August 1993. To evaluate the relative contribution of the different dietary components, the index of relative importance (IRI) was used. Pimelodella laticeps preferred sectors with aquatic macrophytes, and predated mainly on organisms from the periphytic and benthic communities. The main food was cyclopoid copepods, which taxa usually have littoral or benthic habitats, and only to a lesser extent are components of the plankton community. The planktonic organisms available in the environment were analyzed by the Olmstead-Tukey-test, which diagram indicated that the dominant items were copepods, ostracods, and chironomids. Chydorid cladocerans, harpacticoid copepods, mayfly larvae, and amphipods also became dominant but less frequently. To understand the feeding strategies of P. laticeps, the fish diet was compared with the available plankton as analyzed by a nonparametric multivariate analysis (permutation-based one-way ANOSIM). Pimelodella laticeps consumed almost no phytoplankton, while the discriminating items from the latter assemblage were identified as having high values in the environment.

Palavras-chave : Feeding habits; Gray catfish; Dietary plasticity; Neotropical-plains stream; Pampean region.

        · resumo em Espanhol     · texto em Inglês

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons