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Flores-Lopes,Fábio; Cetra,Mauricio; Malabarba,Luiz Roberto. |
Este trabalho utiliza índices ecológicos em taxocenoses de peixes (constância de ocorrência, diversidade de espécies, riqueza, equitabilidade, índice de qualidade integrado (IQ)) como instrumento de avaliação da degradação ambiental. As amostragens foram padronizadas e realizadas sazonalmente durante dois anos, com rede de arrasto do tipo picaré, em onze pontos da bacia hidrográfica do lago Guaíba. Os pontos que apresentaram maior regularidade sazonal nos índices coincidem com locais de melhor qualidade ambiental indicados por outros fatores (frequência de anomalias, DBO5, temperatura, coliformes totais, oxigênio dissolvido). O cálculo do índice de qualidade integrado (IQ), entretanto, foi extremamente influenciado pela abundância e riqueza de espécies,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Impacto ambiental; Índice de qualidade; Lago Guaíba. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400024 |
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Cetra,Mauricio; Mattox,George Mendes Taliaferro; Ferreira,Fabio Cop; Guinato,Rayssa Bernardi; Silva,Fernando Vieira; Pedrosa,Marina. |
Abstract The Paraná River basin has about 600 fish species. In the Upper Paraná, 310 fish species were recorded, with 52 species were registered in the streams and headwaters of the Paranapanema River. The aim of this study was to characterize the stream fish communities in the Upper Paranapanema River basin. Samplings were conducted with electrofishing during the dry season in the year of 2014. The collection effort consisted of 30 streams stretches. As a result, 41 species of stream fish were recorded in the Upper Paranapanema River basin, distributed in 26 genera, 11 families and 7 orders. Thirty-nine percent of the species can be considered rare, 41% intermediate and 20% common. We captured approximately eight species by stream stretch and the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish communities; Estimated richness; Rare species. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000300304 |
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Cruz,Bruna Botti; Teshima,Fernanda Ayumi; Cetra,Mauricio. |
Studies that investigate the relationship patterns between environmental structure complexity and fish fauna provide crucial information to stream restoration efforts. In order to test the hypothesis that streams with more complex environmental structure sustain more diverse and functionally more complex fish communities we sampled fish fauna from Sorocaba River headwater stream reaches (SE - Brazil). Reaches represented two distinct treatments: (1) a simplified reach, characterized by unstable fine substrate, clay, deeper channel and higher water velocity and (2) structurally complex reaches, characterized by coarse substrate, with gravel, pebble, rock, stems and branches and leaves inside the channel, producing a diverse pattern of microhabitat,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioindicators; Environmental heterogeneity; Functional group. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100171 |
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Romero,Renato M.; Moraes,Leonardo E.; Santos,Marcella N.; Rocha,Gecely R. A.; Cetra,Mauricio. |
Trawling is the most common method of shrimp harvesting. This technique causes a negative impact on the fauna due to the high bycatch rates and to the animals that are accidentally caught and generally returned to the sea dead. The consequences of this technique and the biological aspects of the involved species are poorly studied, specially in the Brazilian northeast. The objective of this study was to show some aspects of the population biology of Isopisthus parvipinnis (Bigtooth corvina) captured as bycatch during sea-bob (Xiphopenaeus kroyeri) shrimp fishing in the region of Ilhéus, in the state of Bahia in Brazil. A total of 1290 individuals were caught in a monthly sampling at three different stations, from March, 2003 to February, 2005. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biometric relationships; Inner shelf; Brazilian northeast. |
Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100008 |
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Caló,Camilla Fahning Ferreira; Schiavetti,Alexandre; Cetra,Mauricio. |
Local Ecological and Taxonomic Knowledge (LEK) of fish held by fishermen in the municipality of Ilhéus, Bahia, Brazil, known as the snapper ("vermelho") was examined from August 2005 to November 2006. Semi-structured interviews and tests were made with fishermen selected under the criteria of "specialists". The data analysis followed the union model of the different individual competences. Grouping analysis was performed on data referring to the localities of the occurrence of these fish, depth, coloration, and morphological characteristics of the species using the Pearson correlation coefficient (UPGMA). A total of 19 species were named within the snapper group, although three of them could not be scientifically identified. The Lutjanidae family presented... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lutjanidade; Ethnozoology; Traditional fishing. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300007 |
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Peressin,Alexandre; Casarim,Ruanny; Prado,Ivo Gavião; Cetra,Mauricio. |
ABSTRACT Trophic structure of fish assemblages is one of the most sensitive indicators of changes in streams environments. Since it is crucial to understand the response of trophic groups to habitat alteration, our study aimed to address this research gap by assessing the influence of substrate composition, meso-habitat variability, and bank stability, on the richness, biomass, and number of individuals of carnivores, invertivores, omnivores, and herbivorous-detritivores. Using an electrofishing device, we sampled 13 Atlantic rainforest streams reaches in a degradation gradient, located in the upper Paranapanema river basin. Sample points were ranked using a physical habitat index. More pristine streams had high availability of twigs, trunks, rocks and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abundance; Environmental Assessment; Invertivores; Richness; Substrate. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200205 |
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