The Pacific oyster Crassostrea gigas (Thunberg, 1793) in the Buenos Aires Province. Natural recruitments in the Samborombón Bay
Keywords:Benthos, , invasive species, oysters, diversity, macrofaunal, aquaculture
The pacific oyster Crassostrea gigas, one of the most successful invasive species worldwide, inhabits intertidal and shallow subtidal marine and mixohaline coastal waters. In Argentina the species colonized natural ecosystems of southern Buenos Aires and northern Patagonia. However, in the last years the presence of oysters in the coast of Punta Rasa, northern Buenos Aires, was reported. Therefore, with the aim of recognizing the identity of the species, an exploratory survey in the salt marshes close to San Clemente stream was carried out. Individuals were identified as C. gigas (shell height up to 37 mm, density up to ~390 ind. m-2). Oysters were found clumped in small reefs in muddy substrates mixed with shell debris, attached to the stems of Spartina alterniflora, plastic bags, wooden sticks or other mollusks shells. The origin of the oyster banks could be linked to the establishment of C. gigas experimental farms in Las Toninas (20 km away from the study area) in the late 90’s. Basic research on the species and its potential impact on local ecosystems should be undertaken in the short term.
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Copyright (c) 2012 Diego Giberto, Claudia Bremec, Laura Schejter, Mariana Escolar, Valeria Souto, Agustín Schiariti, Virginia Romero, Éder dos Santos
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