Ecologia alimentar da corvina, Pachyurus bonariensis (Perciformes, Sciaenidae) em duas baías do Pantanal, Mato Grosso, Brasil

Abstract

ABSTRACT. Feeding ecology ofTo express diet results, were used occurrence and volumetric methods. The individuals consumed expressive amount of Chironomidae and Ephemeroptera larvae, in both bays and periods (dry and wet). Ontogenetic analysis showed that small individuals (Standard length = 1.6 to 7.2 cm) ate mainly Chironomidae, whereas larger ones (Standard length = 13.0 to 18.6 cm) consumed mainly Ephemeroptera. Then it is possible to infer that P. bonariensis is benthic-feeding fish with specialized diet. This characteristic was attributed because its narrow niche breadth allied with position and form of its mouth adapted to feed on the bottom. KEYWORDS.Feeding, fishes, bays, Pantanal. A dieta foi composta essencialmente por larvas bentônicas de Chironomidae e Ephemeroptera, independente do local e período (seca e cheia) analisados. Entretanto, nota-se marcante diferença na composição alimentar de acordo com o tamanho do peixe. Os menores exemplares (comprimento padrão = 1,6 a 7,2 cm) consumiram preferencialmente Chironomidae e os maiores (comprimento padrão = 13,0 a 18,6 cm) Ephemeroptera. Conclui-se que P. bonariensis tem hábito alimentar bentívoro e especializado, devido principalmente ao restrito espectro alimentar aliado à posição e forma da boca adaptada a explorar o substrato. RESUMO. Foi investigada a dieta de Pachyurus bonariensis

Early development of two tropical fishes (Perciformes: Sciaenidae) from the Pantanal of Mato Grosso, Brazil

“…Pachyurus bonariensis and P. ternetzi are initially zooplanktivorous and obtain food resources directly in the water column (M. Santin, unpublished data, 2007). However, P. bonariensis explores the substrate throughout its development, and the young feed mainly on Chironomidae and Ephemeroptera larvae (Fugi, Hahn, Novakowski, & Balassa, 2007). This shift in habitat and food resources is therefore favored by changes in mouth position (from terminal to sub-terminal in the postflexion stage).…”

Feeding ecology of Pachyurus bonariensis Steindachner, 1879 (Sciaenidae: Perciformes) in the Ibicuí River, Southern Brazil: ontogenetic, seasonal and spatial variations

“…The most common differences are ontogenetic, seasonal and spatial, and are reported for a large number of species (Aranha et al, 2000;Lucena et al, 2000;Abelha et al, 2001;Mazzoni and Rezende, 2003;Araújo et al, 2005;Barreto and Aranha, 2006;Rezende and Mazzoni, 2006;Viana et al, 2006;Fugi et al, 2007;Pacheco et al, 2008). The two last sources of variations, seasonal and spatial, are primarily related to changes in food resource composition and availability, which are associated with productivity variations and physicochemical changes in aquatic ecosystems.…”

“…The two last sources of variations, seasonal and spatial, are primarily related to changes in food resource composition and availability, which are associated with productivity variations and physicochemical changes in aquatic ecosystems. On the other hand the ontogenetic variations are usually related to morphological changes that lead to shifts in prey selection and capture (Abelha et al, 2001;Vitule and Aranha, 2002;Araújo et al, 2005;Rezende and Mazzoni, 2006;Fugi et al, 2007).…”

“…For this, the dietary composition and the feeding activity were studied, and its ontogenetic, seasonal and spatial variations. The dietary composition was analysed to investigate, in Ibicuí River, its insectivorous specialised diet (Fugi et al, 2007). The ontogenetic, seasonal and spatial variations in trophic spectrum were also investigated to confirm its specialised diet at different situations and to analyse what is the mainly source of dietary variations, those principally due to food availability, seasonal and spatial, or the ontogenetic variation.…”

Dieta de Pachyurus bonariensis (Steindachner, 1879) (Perciformes, Sciaenidae) en Mocoreta, río Uruguay, Argentina

“…1) Devincenzi & Teague (1942), las plantas acuáticas y las sustancias orgánicas del barro no fueron los principales ítems consumidos por esta especie. Sin embargo, a partir de estos resultados se muestra que P. bonariensis, se alimenta principalmente de insectos acuáticos, corroborando los resultados obtenidos por López & Castello (1968), Fugi et al (2007) y Lima & Behr (2010).…”