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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Oligochaeta (Annelida, Clitellata) in lotic environments in the state of São Paulo, Brazil

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Author(s):
Roberto da Gama Alves [1] ; Mercedes Rosa Marchese [2] ; Suzana Cunha Escarpinati [3]
Total Authors: 3
Affiliation:
[1] Universidade Federal de Juiz de Fora. Departamento de Zoologia
[2] Instituto Nacional de Limnologia - Argentina
[3] Universidade Federal de São Carlos. PPG-ERN
Total Affiliations: 3
Document type: Journal article
Source: IHERINGIA SERIE ZOOLOGIA; v. 96, n. 4, p. 431-435, 2006-12-30.
Abstract

Despite the importance of Oligochaeta to the dynamics of aquatic ecosystems and to studies of the biology of pollution, there is currently a dearth of information on this group's ecology in Brazil. The aim of this study was to describe the Oligochaeta fauna in four watercourses - three urban and one rural - in the state of São Paulo: the Pinheirinho stream, the Água Branca stream, the Monjolinho River and the Gouveia stream, respectively. Sediment samples were taken with a Van Veen grab in two areas from each watercourse, during the summer and winter of 2001. In all collection areas, measurements of the pH, electrical conductivity, dissolved oxygen and turbidity of the water were made with a Horiba U-10 device. Principal component analysis showed that axes 1 and 2 explained 68.18% of the results' variability, with the first axis predominantly associated with the granulometric data and the second one with the limnological data. Cluster analysis indicated that area II of the Monjolinho River differed from the other collection sites. In the present study, the Oligochaeta group was represented by Tubificidae, Naididae, Alluroididae, Narapidae and Enchytraeidae. Among the three species of Tubificidae, Limnodrilus hoffmeisteri Claparede, 1862, was the most abundant and most frequent species. The results provided important information on the ecology and distribution of limnic Oligochaeta. (AU)