Availability of sedimentary organic matter for benthic fishes of the upper Paraná river floodplain - DOI: 10.4025/actascibiolsci.v26i2.1634

• Autor(a) principal: Gimenes, Michele de Faveri
• Data de Publicação: 2008
• Outros Autores: Benedito-Cecilio, Evanilde, Takeda, Alice Michiyo, Vismara, Melina Rizzato
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum Biological Sciences
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1634
• topic: planície de inundação; rio Paraná; sedimento; matéria orgânica; 2.01.00.00-0 Biologia Geral

This work aims to investigate the hypothesis that sedimentary organic matter presents concentration variations in accordance to the size of sediment particles and to proximity with the river's margin. This organic matter is known as a feeding source for benthonic fishes. Sampling of the sediment was carried out in dry and rainy periods, at three Paraná River floodplain subsystems. Three sampling points were established: right margin, center and left margin. The samples (n = 88) were submitted to granulometric fractionation (< 70&micro;m; between 70 and 200&micro;m; > 200&micro;m). Low variability in organic matter concentration was observed for samples from the center of the subsystems. Particles, smaller than 70&micro;m, had high variability in organic matter concentration. The rainy period was shown to affect concentration of organic matter adhered to the sediment fractions in transversal section at the sampled environments. With support of literature, the experiment lead to the conclusion that fish species which ingest particles of detritus < 70&micro;m obtain more organic matter of sediment