Trophic structure of fish assemblages from Mamoré River floodplain lakes (Bolivia)

Pouilly, Marc; Yunoki, Takayuki; Rosales, Claudio; Torres, L.

doi:10.1111/j.1600-0633.2004.00055.x

Cited by 52 publications

(53 citation statements)

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“…The importance of BM as an autochthonous food resource for fishes in rivers and streams is well documented in the literature (PREJS & PREJS 1987, LOBON-CERVIÁ & BENNEMANN 2000, ABELHA et al 2001, ABES et al 2001, CALLISTO et al 2002b, CASATTI 2002, WILLIAMS et al 2003, POUILLY et al 2004.…”

Section: Discussionmentioning

confidence: 91%

“…The ability of these organisms to transform vegetal matter and detritus into animal tissues is important for the aquatic food web (VANNOTE et al 1980, MCCAFFERTY 1981, ALLAN 1995, GRAÇA 2001. Several benthic macroinvertebrates (BM) taxa, mainly Diptera, are important food items in the diet of the fish fauna (PREJS & PREJS 1987, ABELHA et al 2001, WILLIAMS et al 2003, POUILLY et al 2004.…”

Section: Ecological Conditions and Habitat Diversitymentioning

confidence: 99%

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Benthic macroinvertebrate assemblages structure in two headwater streams, south-eastern Brazil

2007

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From December 2003 to September 2004, benthic macroinvertebrates (BM), fishes, water and sediment were collected quarterly at six stations in two streams of the upper São Francisco River basin, south-eastern Brazil. We evaluated the ecological conditions, habitat diversity, water quality, composition and structure of BM communities, as well as the food habits of the local fish fauna. By applying a protocol for rapid characterization of ecological conditions and habitat diversity, three of the sampled localities were classified as "pristine" while the others stations were considered "altered". A well oxygenated water with near neutral pH and low electric conductivity (< 0.01 mS/cm) and nutrient concentrations (< 0.08 mg/l total P and < 0.90 mg/l total N) was found for both streams. Sediment analysis revealed the dominance of medium, fine and very fine sand fractions in all sampled areas. The organic matter content in the sediment was higher in the lotic and well preserved area. We found 45 BM taxa, and Chironomidae (68%), Oligochaeta (10%) and Elmidae (8.5%) showed the highest abundances. From the stomach contents analysis of 13 fish species, 26 BM taxa were found, including four that were not collected in the sediment samples, being Chironomidae the dominant group (> 60%). Our results show that human activities such as forest clearing, agriculture and cattle rising have altered the habitat diversity in freshwater ecosystems in a process that affects the aquatic biota and thus the food availability to the fish fauna. The results also highlight the importance of the fish stomach contents analysis as a complementary tool in BM inventories.

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Section: Discussionmentioning

confidence: 91%

Section: Ecological Conditions and Habitat Diversitymentioning

confidence: 99%

Benthic macroinvertebrate assemblages structure in two headwater streams, south-eastern Brazil

2007

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“…Assim, o predomínio e a constância na lagoa de consumidores dos níveis superiores (piscívoras e invertívoras) nas águas altas e de níveis basais (detritívoras) nas águas baixas devem estar associados às elevadas diversidade e abundância de peixes-presa, ao farto suprimento de invertebrados aquáticos e à disponibilidade de detrito orgânico (característico dos ambientes produtivos associados às planícies de inundação) (SOARES et al, 1986;RESENDE, 2000;POUILLY et al, 2004). A elevada abundância de indivíduos na categoria invertívora, juntamente com a detritívora, corroborou as observações feitas em outros sistemas hidrologicamente íntegros, como o rio Mamoré (POUILLY et al, 2004), e diferiu daqueles fortemente alterados pela regulação da vazão hidrológica exercida por barragens, tais como o alto rio Paraná . Tendências similares para a biomassa, no entanto, não foram verificadas, uma vez que a maior parte das espécies dessas categorias não ultrapassou 5 cm de comprimento.…”

Section: Discussionunclassified

Influência do ciclo hidrológico na dieta e estrutura trófica da ictiofauna do Rio Cuiabá, Pantanal Mato-Grossense

Corrêa

Petry

Hahn

2009

Iheringia, Sér. Zool.

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ABSTRACT. Influence of the hydrological cycle on the diet and trophic structure of the ichthyofauna from the Cuiabá River, Pantanal of Mato Grosso, Brazil. This paper evaluate the influence of the hydrological cycle on the diet and trophic structure of the ichthyofauna from the Pantanal. Samplings were carried out monthly between March 2000 and February 2001, in the Cuiabá River and the Chacororé Lagoon. Analysis of the stomach contents of 58 species determined eight trophic categories. Species of the piscivore, detritivore and lepidophage trophic categories presented little variation in the intake food items and, therefore, they did not contribute to the variation in the composition of the diet in both environments, independently of the hydrological cycle. The effects of the flood pulse were more pronounced in the numerical abundance and biomass of detritivore and omnivore trophic categories and were depended on the environment for piscivore, invertivore, and insectivore. Apparently, specificity of the food items along with the probable high availability of food resources in the studied environments contributed to the low variation due to the hydrological seasonality in the trophic organization of the ichthyofauna. By the increment of the hydrological connectivity, the flood pulse of the Cuiabá River allows the exchange of organisms throughout the system, thus determining the variability in the structure of the trophic categories. KEYWORDS.Feeding, trophic structure, flood pulse, Neotropical fishes. RESUMO.Este estudo teve como objetivo avaliar a influência do ciclo hidrológico sobre a dieta e estrutura trófica da ictiofauna no Pantanal. Foram realizadas amostragens mensais entre março de 2000 e fevereiro de 2001, no rio Cuiabá e na lagoa Chacororé. A análise dos conteúdos estomacais de 58 espécies permitiu o reconhecimento de oito categorias tróficas. Peixes das categorias piscívora, detritívora e lepidófaga foram os que apresentaram menor variação na composição da dieta em ambos os ambientes, independente do período hidrológico. Os efeitos do pulso de inundação foram pronunciados na abundância numérica e na biomassa das categorias detritívora e omnívora, enquanto variações nestes parâmetros apresentaram-se relacionadas ao tipo de ambiente para as categorias piscívora, invertívora e insetívora. Os resultados sugeriram que tanto a especialização por alguns itens alimentares quanto a provável elevada disponibilidade de recursos alimentares nos ambientes investigados contribuíram para o fraco efeito do ciclo hidrológico na organização trófica da ictiofauna. Através do aumento da conectividade hidrológica, o pulso de inundação do rio Cuiabá possibilita o deslocamento dos organismos pelo sistema, que deve determinar a variabilidade na estrutura das categorias tróficas. PALAVRAS-CHAVE.Alimentação, estrutura trófica, pulso de inundação, peixes neotropicais.Estudos sobre alimentação da ictiofauna permitem reconhecer categorias tróficas distintas e inferir sobre a estrutura e o grau de importância dos diferentes níveis...

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“…paucirastrus Aguilera, 1983. The predominance of aquatic insects in the food of fish is common in freshwater communities (Sabino and Castro, 1990;Aranha et al, 2000;Abes et al, 2001;Andrade and Braga, 2005;Pouilly et al, 2004;Braga, 2005;Fugi et al, 2007;Pacheco et al, 2008), making the insect larvae a very important food category for fish (Zavala-Camin, 1996). Certain benthic insects, such as Diptera larvae and Ephemeroptera, are abundant in rivers with sandy bottoms (Braga, 2005) such as the Ibicuí River.…”

Section: Discussionmentioning

confidence: 99%

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

Lima

2010

Braz. J. Biol.

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Knowledge of the feeding ecology of fish is essential for understanding the functioning of freshwater communities. Here we report on an analysis of the diet of Pachyurus bonariensis Steindachner, 1879, a freshwater sciaenid. Fish were collected bimonthly from December 1999 to January 2002 at three locations along the Ibicuí River in the Rio Grande do Sul State, Brazil. At each location, the specimens were collected in both lentic and lotic environments. The stomachs of 324 fish were analysed for contents and fullness. The main items were Ephemeroptera, Diptera (larvae), Trichoptera and Odonata. Annelida, plant matter, Decapoda, Diptera (pupae), Coleoptera and Mollusca were present in small amounts. The fish consumed smaller amounts of food in winter than in other seasons. The most important source of dietary variation for P. bonariensis was the ontogenetic, related to intrinsic biological characters. However, spatial variation was also found, suggesting that this species can adapt its diet to environmental changes. Although P. bonariensis showed ontogenetic and spatial variations in the main items consumed, the main items were always insects, characterising P. bonariensis as a fish with an insectivorous feeding habit in the Ibicuí River.Keywords: feeding activity, diet composition, trophic ecology, insects, fishes. Biol., 2010, vol. 70, no. 3, p. 503-509 the dominant species (Behr, 2005). 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. Its feeding activity was analysed to investigate the influence of year seasons and spatial heterogeneity on food ingestion. Ecologia trófica de Pachyurus bonariensis

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Trophic structure of fish assemblages from Mamoré River floodplain lakes (Bolivia)

Abstract: Un resumen en españ ol se incluye detrás del texto principal de este artículo.

Cited by 52 publications

References 11 publications

Benthic macroinvertebrate assemblages structure in two headwater streams, south-eastern Brazil

Benthic macroinvertebrate assemblages structure in two headwater streams, south-eastern Brazil

Influência do ciclo hidrológico na dieta e estrutura trófica da ictiofauna do Rio Cuiabá, Pantanal Mato-Grossense

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

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