Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/78546
Type: Artigo de periódico
Title: Temporal variation of annelids in the intertidal zone of beaches of the Sao Sebastiao Channel, southern Brazil
Author: Rizzo, AE
Amaral, ACZ
Abstract: Monthly collections were made for one year (August 1995 to July 1996) in the intertidal zone of two beaches (Engenho d'Agua and Sao Francisco) located in the Sao Sebastiao Channel, State of Sao Paulo, Brazil, in order to establish the seasonal fluctuations of the species and the factors determining these fluctuations. On each beach, a 10 m wide sector of varying width was established, from which 15 samples/month were collected with a cylindrical corer (0.01 m(2)). The salinity of the interstitial water and the temperature of the sediment were measured monthly, while the granulometric parameters and calcium carbonate and organic matter concentrations were recorded seasonally The temporal distribution of the species was more homogeneous at Engenho d'Agua, where the highest diversity and evenness values were also found, although the number of individuals was lower. At Sao Francisco, the monthly abundance was higher, but the richness, diversity, and evenness values were lower, showing some heterogeneity in the temporal distribution patterns of the species. Most species at Engenho d'Agua reached their peak of abundance in summer and autumn. The most abundant and frequent species at Engenho d'Agua were Nematonereis hebes, Cirriformia filigera (summer), Scyphoproctus djiboutiensis (spring), Owenia fusiformis and Isolda pulchella (winter). At Sao Francisco, the capitellids Capitella capitata, Heteromastus filiformis, and Capitomastus minimus, and the tubificid oligochaetes dominated in the summer, and Laeonereis acuta and Scolelepis squamata in the winter. The log-normal distribution of the species was used to group those species that are sensitive to and those that are tolerant of organic enrichment, over the four seasons of the year.
Country: EUA
Editor: Cambridge Univ Press
Rights: embargo
Identifier DOI: 10.1017/S0025315400003076
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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