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Type: Artigo de periódico
Title: Intertidal macrofauna in Brazilian subtropical tide-dominated sandy beaches
Author: Amaral, ACZ
Denadai, MR
Turra, A
Rizzo, AE
Abstract: An integrated program "Fauna de Praia" (Sandy Beach Fauna) was conducted to investigate the macrofauna of the inter-tidal sandy beaches in S (a) over tildeo Sebasti (a) over tildeo Channel (S (a) over tildeo Paulo State, Brazil). This region has a wide variety of unconsolidated intertidal environments, which is reflected in the composition of the local fauna. Ten-meter wide strips with widths corresponding to the tidal range were marked and sampled on each sandy beach. Samples were taken monthly between August 1995 and July 1997, using,two corers (0.01 and 0.16 m(2)). Mean grain size and sorting coefficient, silt, calcium. carbonate and organic matter contents, and salinity were recorded to characterize each study site. Six environmental types were recognized among the 13 study sites, grouped in relation to environmental variables and species composition: (1) fine sand and gravel; (2) sandy-muddy; (3) sand flat - very fine sand; (4) fine and very fine sand; (5) medium and coarse sand; and (6) sand and rock fragments. Polychaetes dominated in richness and abundance, followed by molluscs and crustaceans. Greater richness and abundance were observed in areas with low tide terraces (1 to 3) and in the more heterogeneous environmental type (6). Organic enrichment in some areas of S (a) over tildeo Sebasti (a) over tildeo Channel was evidenced by the presence of indicator species but the organic matter content was showed to not influence species composition. Higher richness was positively related to higher values of salinity and coarser sand grains, while calcium carbonate content has a positive influence on density. Environmental type identification is an important instrument available for decision-making in S (a) over tildeo Sebasti (a) over tildeo Channel and other similar seascape's. However, consistent conservationist proposes should be applied to the entire channel once its circulation pattern integrated these environmental. types and may quickly spread local impacts.
Subject: annelida
abiotic factors
Sao Sebastiao Channel
Country: EUA
Editor: Coastal Education & Research Foundation
Rights: fechado
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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