Macrofauna de substratos inconsolidados da zona entre-mares em duas localidades do canal de santa cruz (forte orange e itapissuma) Pernambuco, Brasil. 01/08/2002

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In May of 2001 (corresponding to the rainy period), 60 sediment samples were collected inside two areas of 100 m2 size located in the intertidal zone of the Santa Cruz Channel (Forte Orange and Itapissuma), Pernambuco state, Brazil. A PVC tube with 10 cm of diameter and 25 cm of length was buried in the sediment for the collection of the macrofauna and of the samples for sedimentological analyses (grain size and organic matter). In the opportunity, intersticial water temperature and salinity values were taken. This study aimed to characterize the macrofauna with emphasis in MOLLUSCA, POLYCHAETA and CRUSTACEA, relating its occurrence to some abiotic parameters, such as interstitial water salinity and temperature, granulometry and amount of organic matter in the sediment. The differences of temperature of intersticial water among the two stations were not important factors for the communities, unlike sediment granulometry and of salinity of intersticial water which were important. At Forte Orange station, the prevalence of MOLLUSCA was observed: Anomalocardia brasiliana (Gmelin, 1791) (juvenile), Neritina virginea (Linnaeus, 1758) (juvenile) and Odostomia laevigata (Orbigny, 1842) (juvenile), while POLYCHAETA and CRUSTACEA were not as important. These mollusks presented a frequency of occurrence 100% and a density of 7.432 org.m-2, 3.857 org.m-2 and 3.164 org.m-2, respectively. Anomalocardia brasiliana (Gmelin, 1791) (juvenile) was considered abundant, with a total index of 47,53%; the diversity by sample varied from low to average. Analysis of pricipal components associated Spio sp. and Nereis oligohalina (Rioja, 1946) to very coarse sands and coarse sand, and inversely to fine sand; it evidenced that Odostomia laevigata (Orbigny, 1842) (juvenile) and Sigambra sp. were correlated directly; and Anomalocardia brasiliana (Gmelin, 1791) was inversely proportional to Diopatra cuprea (Bosc, 1802). In the Itapissuma station, POLYCHAETA were more abundant than MOLLUSCA, even so with densities inferior to those found in the Forte Orange station. The POLYCHAETA Glycinde sp. and Haploscoloplos sp. were not considered very abundant, with total indexes of 23,08%; frequency of occurrence of 50% and 40%, respectively, and a density of 91 org.m-2 for both. The diversity varied from low to very low. In the principal component analysis, it was evidenced that the sediment conditioned the enviroment, and that Sigambra sp. was correlated to the salinity and to fine sand, while Haploscoloplos sp., was correlated to medium sand. The POLYCHAETA Spio sp. Haploscoloplos sp., Sigambra sp., Magelona sp., Nereis oligohalina (Rioja, 1946) e Marphysa sebastiane (Steiner &Amaral, 2000) were the first occurrence citations to the state of Pernambuco

ASSUNTO(S)

substratos inconsolidados zona entre-mares - canal de santa cruz (forte orange e itapissuma) pernambuco oceanografia macrofauna

ACESSO AO ARTIGO

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