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Continental ichthyofauna from the Paraíba do Norte River basin pre-transposition of the São Francisco River, Northeastern Brazil Biota Neotropica
Ramos,Telton Pedro Anselmo; Lima,Jéssica Alcoforado de Sena; Costa,Silvia Yasmin Lustosa; Silva,Márcio Joaquim da; Avellar,Raizze da Costa; Oliveira-Silva,Leonardo.
Abstract: Freshwater ichthyofauna from Brazil Northeast region was considered as being poorly known until recent years, with a considerable number of publications becoming available in the last decade. The present study provides an inventory of freshwater fish species from the Paraíba do Norte River basin located in Paraíba State, Brazil. This inventory is intended to contribute to the of knowledge to the regional fish diversity, pre-transposition of the São Francisco River. Collecting data was obtained from ichthyological databases of both national and foreign institutions. A total of 47 freshwater fish species are registered within the Paraíba do Norte River basin, represented by 38 genera, 20 families and six orders. Characiformes, comprising 47% (22...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Freshwater fishes; Neotropical Region; Diversity; Identification key.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000400207
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Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil Biota Neotropica
Farias,Rafaela Lima de; Alencar,Thuanny Fernanda Braga; Lima,Jéssica Alcoforado de Sena; Medeiros,Elvio Sergio Figueredo.
Chironomidae is a common family in freshwaters, often occurring at high densities, which hinders the processing of large samples, given that time and labor are usually limited. The present study aims at evaluating the extent of the error related with the subsampling of Chironomidae from a larger sample with regard to the size of the individuals between a sample and the subsample. A total of 9195 chironomids were collected from three sites in an intermittent stream. Samples were taken using a D-shaped net (250 µm) on eight occasions. Individuals from each sample were homogenized in a gridded Petri dish and coordinates from lines and columns were randomly drawn. Individuals from the assigned coordinates were selected until 100 individuals or 10% of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Temporary pools; Sampling effort; Aquatic insects.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100402
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