Moluscos dos substratos inconsolidados do mediolitoral do estuÃrio do Rio JaboatÃo, Pernambuco - Brasil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Estuaries are high productivity ecosystems and very important to consumers of different throphic levels. In general, estuaries are under strong anthropogenic influence affecting the residents species. The JaboatÃo River is very important to the city of same name and also to other cities including Recife, as many families are dependent upon the fisheries, including the capture of fishes,crabs and bivalves mollusks. Besides this, it was criated in march 2001 by Pernambuco State the committee of Hydrographic basin of the JaboatÃo river, organization that will define the waters use, so this wish will that be used racionally by the following cities: VitÃria de Santo AntÃo, Moreno, Cabo de Santo Agostinho, Recife, SÃo LourenÃo da Mata and JaboatÃo dos Guararapes. Due to this, besides the lack of informationâs about the mollusks of this area, it was carried out the present research to assess the tidal infaunal mollusks emphasizing in the species of economic interest. Six areas of study were selected with a GPS, and a perpendicular profile from right to left borders were marked and a 10m2 area was marked as collection station with triplicate sampling, totaling 48 stations. In each station a 0.25m2 was used were the sediment was collect with 0.20 m2 of area. The collected material was dropped in plastic bags and fixed with 4% formaldehyde. The samples were carried to the Benthos Laboratory of the Federal University of Pernambuco to be later separated and the species identified. The samples were washed in sieves of 0.5 mm and 1.0 mm of mesh size. At laboratory the animals were counted, measured and identified. In each collection station sediment were collected to granulometric analysis. In each area of study the superficial salinity, temperature and dissolved oxygen were measured. It was registered 28 species belonging to 20 families. The most abundant families were Tellinidae, Veneridae and Lucinidae. The species with higher individuals number were Tagelus plebeius, Anomalocardia brasiliana and Macoma constricta; among the Gastropoda outranked: Neritina virginea, Solariorbis shumoi and Rissoina bryerea. The estuary right border presented higher density due to sediment composition (fine sand) favoring the presence of bivalve banks. Area I presented higher species diversity due marine influence. Among the environmental parameters salinity had great influence in species distribution, being observed that Tagelus plebeius were more abundant when salinity varied between 9.35 and 28,07; Anomalocardia brasiliana were more abundant when salinity varied between 24.76 and 31.82; Iphigenia brasiliana more abundant when salinity varied between 25.67 and 33.15 and Macoma constricta more abundant when salinity of 2.40 and 14.97. Our data allowed to separate the community in three groups: true estuarine, marine and those of both environments

ASSUNTO(S)

oceanografia malacologia-gastrÃpodes e bivalves espÃcies estuarinas mediolitoral-povoamentos-distribuiÃÃo das espÃcies estuÃrios-distribuiÃÃo ecolÃgica-salinidade e sedimentologia anÃlise de agrupamentos-associaÃÃo de espÃcies-impactos ambientais

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