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Título: Trophic structure of macroinvertebrate communities in the Jau River system
Bruce Rider Forsberg
Assunto: rio
ISSN: 1516-5868
Revista: Brazilian Journal of Ecology
Volume: 3
Resumo: The River Continuum Concept (RCC) provides a holistic theoretical framework for understanding the trophic structure and functioning of fluvial ecosystems. Macroinvertebrate functional feeding groups (FFGs) play a key role in these systems, processing specific sizes classes and types of organic resources in similar ways. The RCC makes specific predictions about the spatial distributions of FFGs along the river size-continuum. We present here the first test of these predictions in a neotropical fluvial ecosystem, the Jaú River. Distributions of aquatic macroinvertebrate FFGs, determined along a continuum of river size within the Jaú basin, were compared to those predicted by the RCC. Aquatic macroinvertebrates were collected in 1st, 2nd, 3rd, 4th and 7th order tributaries of the Jaú using an optimized sampling scheme on four distinct occasions between March and November of 1995. As expected by the RCC, the relative abundances of most FFGs varied significantly with stream size. The specific patterns encountered for several FFGs though were quite distinct from those predicted by the RCC. The communities in headwater streams, which according to the RCC should be dominated by shredders and benthic particle collectors, were dominated by scrapers and omnivores, apparently feeding on fungi. The relative abundance of predators, which is expected to be relatively constant in the RCC, varied considerably between tributaries in the Jaú, due primarily to differences in prey availability. Two distinct pathways for the processing of allochthonous particulate organic matter were identified in the Jaú river system: 1) a dominant pathway beginning with the colonization and consumption of leaf litter by fungi and 2) a minor pathway, initiating with the consumption of submerged leaves by shredders.
ISSN: 1516-5868
Local de publicação: Brasil
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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