Abstract
The composition and spatial and temporal variation of oligochaete community were analyzed in Patos Lake and Ivinhema River, a tributary of the Paraná River Brazil, during the period March 1993 to February 1994. Lentic and lotic environments were studied, with the objective of analyzing species association and temporal changes in the function of the abiotic variables at nine sites studied. Seventeen species of oligochaetes were identified. Oligochaete association was analyzed by Detrended Correspondence Analysis (DCA) and abiotic variables, by Principal Components Analysis (PCA). This method showed that Aulodrilus pigueti predominated in Patos Lake, probably because it has adapted to mud with high organic matter in low currents. Brinkhurstia americanus predominated at the right bank of the Ivinhema River while Paranadrilus descolei predominated at the left bank. Temporal variation of organism density was influenced by hydrological cycle, and spatial variation was determined by grain size and quantities of organic matter in the sediments.
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Montanholi-Martins, M.C., Takeda, A.M. Spatial and temporal variations of oligochaetes of the Ivinhema River and Patos Lake in the Upper Paraná River Basin, Brazil. Hydrobiologia 463, 197–205 (2001). https://doi.org/10.1023/A:1013163927814
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DOI: https://doi.org/10.1023/A:1013163927814