Biologia populacional de Pachyurus bonariensis Steindachner, 1879 (Perciformes, Sciaenidae), uma espécie alóctone no sistema hidrográfico da laguna dos patos, Brasil

Dufech, Ana Paula Sassanovicz; Fialho, Clarice Bernhardt

doi:10.1590/s1676-06032007000100015

Cited by 13 publications

(12 citation statements)

References 21 publications

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“…Some of the Neotropical non-natives were probably unintentionally introduced via inter-basin man-made connections resulting from land management for agriculture (rice fields), and eventually dispersed rapidly and reached high abundances in different parts of the Patos Lagoon basin (e.g. Pachyurus bonariensis and Trachelyopterus lucenai, see Becker, 2002;SaccolPereira et al, 2006;Becker et al, 2007;Dufech and Fialho, 2007). We found museum records (MCP) for Tilapia rendalli collected in fish ponds in the late 1970s, however there was no record of this species in natural waters at the Taquari-Antas basin.…”

Section: Trichomycterus Tropeiromentioning

confidence: 99%

Fishes of the Taquari-Antas river basin (Patos Lagoon basin), southern Brazil

Becker

Ferrer

et al. 2013

Braz. J. Biol.

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The aquatic habitats of the Taquari-Antas river basin (in the Patos Lagoon basin, southern Brazil) are under marked environmental transformation because of river damming for hydropower production. In order to provide an information baseline on the fish fauna of the Taquari-Antas basin, we provide a comprehensive survey of fish species based on primary and secondary data. We found 5,299 valid records of fish species in the basin, representing 119 species and 519 sampling sites. There are 13 non-native species, six of which are native to other Neotropical river basins. About 24% of the total native species are still lacking a taxonomic description at the species level. Three native long-distance migratory species were recorded (Leporinus obtusidens, Prochilodus lineatus, Salminus brasiliensis), as well as two potential mid-distance migrators (Parapimelodus nigribarbis and Pimelodus pintado). Although there is only one officially endangered species in the basin (S. brasiliensis), restricted range species (21.7% of total species) should be considered in conservation efforts.Keywords: ichthyofauna, biodiversity, survey, neotropical, Rio Grande do Sul. Peixes da bacia do rio Taquari-Antas (sistema da Laguna dos Patos), sul do Brasil ResumoOs ambientes aquáticos da Bacia do rio Taquari-Antas (Bacia da Laguna dos Patos, sul do Brasil) vêm sofrendo considerável transformação, principalmente em razão da implantação de barragens para geração de energia elétrica. Com o objetivo de estabelecer um diagnóstico amplo da ictiofauna da Bacia do Taquari-Antas, realizou-se um inventário das espécies dessa bacia a partir de dados primários e secundários. Foram obtidos 5.299 registros válidos de espécies de peixe na bacia, representando 119 espécies e 519 localidades amostradas. Ocorrem, na bacia, 13 espécies não nativas, seis das quais são oriundas de outras bacias neotropicais. Cerca de 24% de todas as espécies carecem de descrição taxonômica no nível específico. Foram registradas três espécies nativas migradoras de longa distância (Leporinus obtusidens, Prochilodus lineatus e Salminus brasiliensis) e duas potenciais migradoras de média distância (Parapimelodus nigribarbis e Pimelodus pintado). O fato de uma espécie ser oficialmente reconhecida como ameaçada na bacia (S. brasiliensis) e a grande proporção de espécies de distribuição restrita (21,7% do total) devem ser levados em consideração nos esforços de conservação.Palavras-chave: ictiofauna, biodiversidade, inventário, neotropical, Rio Grande do Sul.

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Section: Trichomycterus Tropeiromentioning

confidence: 99%

Fishes of the Taquari-Antas river basin (Patos Lagoon basin), southern Brazil

Becker

Ferrer

et al. 2013

Braz. J. Biol.

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“…The year seasons did not make (Hahn et al, 1997;Bennemann et al, 2000;Braga, 2005;Branco et al, 2005;Barreto and Aranha, 2006;Viana et al, 2006). This situation may be related to lower food availability -decrease of prey populations, less reproductive activity (Dufech and Fialho, 2006) or decreased metabolic activity of the predators (Viana et al, 2006). Previously, the diet of P. bonariesis had been approached just in descriptive works of the Uruguay River, without empiric observations.…”

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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“…From a historical view, it is also interesting to identify the gradual appearance of species from the Uruguay basin in the Patos drainage. These new invaders are Pachyurus bonariensis Steindachner 1879 (Dufech & Fialho, ; Milani & Fontoura, ), Acestrorhynchus pantaneiro Menezes 1992 (Saccol‐Pereira et al ., ) and Pseudoplatystoma corruscans (Spix & Agassiz 1829) (unpubl. data).…”

Section: Exotic Speciesmentioning

confidence: 99%

Aspects of fish conservation in the upper Patos Lagoon basin

Fontoura

Vieira

Becker

et al. 2016

Journal of Fish Biology

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The Patos Lagoon basin is a large (201 626 km(2) ) and complex drainage system in southern Brazil. The lagoon is 250 km long and 60 km wide, covering an area of 10 360 km(2) . The exchange of water with the Atlantic Ocean occurs through a 0·8 km wide and 15 m deep inlet, fixed by 4 km long jetties, at the southernmost part of the Patos Lagoon. The estuarine area is restricted to its southern portion (10%), although the upper limit of saline waters migrates seasonally and year to year, influenced by the wind regime and river discharge. The known number of recorded limnetic fish species is 200, but this number is expected to increase. A higher endemism is observed in fish species occurring in upper tributaries. The basin suffers from the direct impact of almost 7 million inhabitants, concentrated in small to large cities, most with untreated domestic effluents. There are at least 16 non-native species recorded in natural habitats of the Patos Lagoon basin, about half of these being from other South American river basins. Concerning the fishery, although sport and commercial fisheries are widespread throughout the Patos Lagoon basin, the lagoon itself and the estuarine area are the main fishing areas. Landing statistics are not available on a regular basis or for the whole basin. The fishery in the northern Patos Lagoon captures 31 different species, nine of which are responsible for most of the commercial catches, but only three species are actually sustaining the artisanal fishery: the viola Loricariichthys anus: 455 kg per 10 000 m(2) gillnet per day, the mullet Mugil liza: 123 kg per 10 000 m(2) gillnet per day and the marine catfish Genidens barbus: 50 kg per 10 000 m(2) gillnet per day. A decline of the fish stocks can be attributed to inadequate fishery surveillance, which leads to overfishing and mortality of juveniles, or to decreasing water quality because of urban and industrial activities and power production. Global climatic changes also represent a major threat to the Patos system by changing the frequency of El Niño-La Niña-Southern Oscillation (ENSO).

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Biologia populacional de Pachyurus bonariensis Steindachner, 1879 (Perciformes, Sciaenidae), uma espécie alóctone no sistema hidrográfico da laguna dos patos, Brasil

Cited by 13 publications

References 21 publications

Fishes of the Taquari-Antas river basin (Patos Lagoon basin), southern Brazil

Fishes of the Taquari-Antas river basin (Patos Lagoon basin), southern Brazil

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

Aspects of fish conservation in the upper Patos Lagoon basin

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