assemblage structure in a marginal lake disconnected from the submedium São Francisco River, Pernambuco. Biota Neotrop., 9(3): http://www. biotaneotropica.org.br/v9n3/en/abstract?article+bn01809032009.Abstract: Samplings with various fishing devices were undertaken between March 2007 and February 2008, in the Curralinho lake, a marginal pond located in the submedium São Francisco river, aiming at evaluating the fish fauna composition after its isolation from the river channel and water depletion. A total of 4,638 specimens was collected, with a biomass of 129,782.84 g, distributed in 16 families and 47 species from the Orders Characiformes, Cyprinodontiformes, Siluriformes, Perciformes, Gymnotiformes and Clupeiformes. Characiformes were most abundant and 87.3% of the specimens were small (<100 mm) or medium-sized (<200 mm). Among the species collected, 26.7% were constant, 35.6% accessory and 37.8% accidental. Characidae encompasses most of the species and individuals, followed by Acestrorhynchidae. Moenkhausia costae, Triportheus guentheri, Pygocentrus piraya and Prochilodus argenteus were present in all samples. Invertivores and piscivores dominated quantitatively and their biomass indicate a predominance of predators, with detritivores presenting the second greatest biomass. Resident species prevailed, with few individuals of migratory fish belonging to Anostomidae and Prochilodontidae families and Salminus franciscanus. Fish richness, diversity and equitability were relatively high throughout the period of study. It may be concluded that the Curralinho lake is an important shelter, feeding and resting ground for the ichthyofauna, mainly for forage fish that serve as the basis of the trophic chain and fisheries´ sustainability. Therefore, there is an urgent need of environmental policy and management practices development that would preserve habitat integrity and functionability of their role in the conservation of ichthyodiversity of this stretch of the São Francisco basin. Keywords: Curralinho, San Francisco, fish, ichthyodiversity. LUZ, S.C.S., EL-DEIR, A.C.A., FRANÇA, E.J. & SEVERI, W. Estrutura da assembléia de peixes de uma lagoa marginal desconectada do rio, no submédio Rio São Francisco, Pernambuco. Biota Neotrop., 9(3): http://www.biotaneotropica.org.br/v9n3/pt/abstract?article+bn01809032009.Resumo: Foram realizadas coletas utilizando vários apetrechos de pesca, entre os meses de março/07 e fevereiro/08, na lagoa Curralinho, uma lagoa marginal no trecho submédio do rio São Francisco, com o objetivo de avaliar a composição ictiofaunística após seu isolamento da calha principal do rio e deplecionamento de água. Foi coletado um total de 4.638 espécimes, com uma biomassa de 129.782,84 g, distribuídos em 16 famílias e 47 espécies das ordens Characiformes, Cyprinodontiformes, Siluriformes, Perciformes, Gymnotiformes e Clupeiformes. Observou-se que os Characiformes foram os mais abundantes, com 87,3% dos exemplares de pequeno (<100 mm) e médio porte (<200 mm). Dentre as espécies encontradas, 26,7% são con...
Composição da ictiofauna em ambientes marginais e tributários do médio-submédio rio São Francisco RESUMO Os trechos médio e submédio do rio São Francisco são os mais afetados pela construção de barragens hidrelétricas na bacia, com mais de 550 km represados. Apesar do impacto de represamentos sobre a composição e distribuição de peixes, a ictiofauna destes trechos é a menos conhecida de toda a bacia. O presente trabalho teve como objetivo caracterizar as assembleias de peixes de nove lagoas marginais, três lagoas temporárias e 12 rios e riachos, localizados entre os municípios de Barra (BA) e Belém do São Francisco (PE), durante os períodos seco e chuvoso, entre setembro/2006 e setembro/2009. Foram identificadas 61 espécies, distribuídas dentre Characiformes (39 espécies), Siluriformes (8), Perciformes (7), Cyprinodontiformes (3); Gymnotiformes (2); Clupeiformes e Synbranchiformes (1 cada). As assembleias de peixes foram constituídas por indivíduos de pequeno porte, 76% deles com CP < 100 mm, e os demais com CP entre 100 e 180 mm. Apesar de ambientes alagáveis serem importantes para peixes reofílicos, foram registradas 12 espécies migradoras. A ictiofauna dos ambientes estudados é composta predominantemente por invertívoros de pequeno porte e hábito residente, tendo invertívoros e onívoros ocorrido em todos os tributários, enquanto a maioria dos herbívoros foi registrada nas lagoas.
Several species of Cichla successfully colonized lakes and reservoirs of Brazil, since the 1960’s, causing serious damage to local wildlife. In this study, 135 peacock bass were collected in a reservoir complex in order to identify if they represented a single dominant species or multiple ones, as several Cichla species have been reported in the basin. Specimens were identified by color pattern, morphometric and meristic data, and using mitochondrial markers COI, 16S rDNA and Control Region (CR). Overlapping morphological data and similar coloration patterns prevented their identification using the taxonomic keys to species identification available in the literature. However, Bayesian and maximum likelihood from sequencing data demonstrated the occurrence of a single species, Cichla kelberi. A single haplotype was observed for the 16S and CR, while three were detected for COI, with a dominant haplotype present in 98.5% of the samples. The extreme low diversity of the transplanted C. kelberi evidenced a limited number of founding maternal lineages. The success of this colonization seems to rely mainly on abiotic factors, such as increased water transparency of lentic environments that favor visual predators that along with the absence of predators, have made C. kelberi a successful invader of these reservoirs.
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