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Effects of the flood pulse on the isotopic composition (δ13C and δ15N) of the particulate organic carbon (POC) in the upper Paraná floodplain Biological Sciences
Fiori, Leandro Fabrício; Sacramento, Patricia Almeida; Corbetta, Daiany de Fátima; Pereira, Lucas Milani; Benedito, Evanilde.
The particulate organic carbon (POC) is an important energy source present in the food chain of detritivorous fish. Considering its importance, this study aimed to investigate the effect of the flood pulse on the composition of the POC in a neotropical floodplain. For this, we analyzed the seasonal variations of the carbon isotopic composition (δ13C) and nitrogen (δ15N) in two different hydrological periods in the years 2000 and 2009. Sampling of potential sources of primary producers, as well as the POC, was held in different subsystems of the floodplain of the upper Paraná river (subsystems of the rivers Parana, Baía and Ivinheima). In 2000, there were significant differences on isotopic signature (δ13C) of the POC, unlike what was seen in 2009, where...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.05.02.00-1 potamophase; Limnophase; Rivers; Water level; Wetlands Ecologia de Ecossistemas.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/20336
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Population structure of fishes from an urban stream Biological Sciences
Zanatta, Naiara; Pazianoto, Laryssa Helena Ribeiro; Cionek, Vivian de Mello; Sacramento, Patrícia Almeida; Benedito, Evanilde.
 The aim of this study was to identify the population structure of the ichthyofauna in an urban stream within an environmental protection area in southern Brazil. Quarterly samplings were conducted between October 2009 and August 2010. Poecilia reticulata was the most abundant species, followed by Hypostomus ancistroides and Rhamdia quelen. It was found a higher proportion of adults instead of juveniles from P. reticulata and R. quelen populations, while the opposite was recorded for H. ancistroides. Sex ratio of 1:1 was found for H. ancistroides, but differed significantly for P. reticulata and R. quelen. Females of P. reticulata and R. quelen reached higher length than males in the smaller and higher length-classes, while H. ancistroides females were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sex ratio; Reproduction; Population attributes..
Ano: 2017 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31899
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