Oligochaeta aquáticos em diferentes ambientes da planície aluvial do alto rio Paraná.
In the upper Paraná River plain, the distribution of benthic organisms is directly affected by the variation in the flow of the main channel and geomorphological aspects that influence the physical and chemical characteristics of the environment. Oligochaeta is one of the most abundant zoobênticos groups of the upper Paraná River plain, and recorded in different environments that plain. The samples were collected every three months between February 2000 and November 2002 in different types of environments Ivinhema and Parana rivers. In lotic, it was found higher percentages of sandy sediment, ponds, mud percentages and higher organic matter, especially lakes without communication. These studies were analyzed 10,250 individuals Oligochaeta. Through the indicator value analysis (IndVal) allowed the classification indicator species from different environments: Haplotaxis aedochaeta as indicator species of the main channel Ivinhema, Narapa bonettoi for the primary and secondary channels, while for ponds with communication and without communication direct with Ivinhema, indicator species were Pristina osborni and Branchiura sowerbyi respectively. The dynamic factors of the water flow and the degree of connectivity of the lakes with the main channel, influenced the composition and abundance of Oligochaeta. Temporal variations in density and dominance of species of Oligochaeta of the Parana River, seem to be controlling the impact of the consequences of the hydrological regime of the river, exercised by dams located upstream. These results underscore the need for specific knowledge of Oligochaeta in benthic macroinvertebrate studies because they are good indicators of specific environments and environmental change.
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| Format: | Thesis/Dissertation biblioteca |
| Language: | Portuguese |
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Universidade Estadual de Maringá. Departamento de Biologia. Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais.
2005
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| Subjects: | Ivinhema River, Hydrological regime, Brazil, Upper Paraná River, Alto rio Paraná, Planície de inundação, Oligochaeta, Brasil, Indicadores ambientais, Rio Ivinhema, Regime hidrológico, Lagoons, Floodplain, Ciências Ambientais, |
| Online Access: | http://hdl.handle.net/1834/10035 |
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