Data/hora: 03/06/2024 06:02:38

Provedor de dados: | 76
País: | Brazil
Título: | Diet of Astyanax paranae (Characidae) in streams with different riparian land covers in the Passa-Cinco River basin, southeastern Brazil
Autores: | Ferreira,Anderson; Gerhard,Pedro; Cyrino,José E. P.
Data: | 2012-03-01
Ano: | 2012
Palavras-chave: | Feeding ecology; Characiformes; Insectivorous fishes; Habitat features.
Resumo: | An analysis of the diet of Astyanax paranae Eigenmann, 1914 in nine streams located in the Passa-Cinco River basin (upper Paraná River system) was performed to investigate the feeding habits of this species, check for possible spatial variations in diet and to investigate the influence of riparian vegetation in the composition of the diet. Stomach contents of 243 specimens were analyzed by the methods of relative frequency of occurrence and volume, and the diet was characterized by the alimentary index (AIi). The species showed insectivorous feeding habits, with a predominance of terrestrial and aquatic insects in the diet, varying by location. In most streams, resources of allochthonous origin were the most consumed. The participation of aquatic insects and terrestrial plants were high in most streams, while terrestrial insects and invertebrates were highest in streams with a greater presence of riparian forest. The two streams located draining pasture fields were the only places were A. paranae consumed algae and macrophyte fragments. These results were corroborated by the analysis of similarity (ANOSIM): the descriptor "percentage of riparian forest" was the highest environmental influence on the diet of A. paranae. The study shows that riparian forest percentage on the stream reach determines the species diet composition, but A. paranae is also able to gather enough food resources in a variety of severely degraded environments.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000100011
Editor: | Museu de Ciências Naturais
Relação: | 10.1590/S0073-47212012000100011
Formato: | text/html
Fonte: | Iheringia. Série Zoologia  v.102 n.1 2012
Fonte: | info:eu-repo/semantics/openAccess