TAFONOMÍA DE UNA CONCENTRACIÓN DE VALVAS DEL BIVALVO INVASOR Corbicula fluminea (MÜLLER, 1774), RÍO DE LA PLATA SUPERIOR, URUGUAY

The bioinvader bivalve Corbicula fluminea (Müller, 1774) is known in the Río de la Plata River since about 35 years ago. This time lapse fills a gap taphonomical studies, that comprises usually strictly contemporaneous or at best centuries-old phenomena. We sampled shells of this species one locality two occasions with same methodology. Fragmentation, presence periostracum, corrasion, bioerosion and bioencrustation were studied externally four sectors valve: umbonal, anterior, central, posterior. tested differences frequencies attributes between samples by means Χ2, resulting only significantly different corrasion umbonal sector fragmentation central posterior areas.The area was most affected sector, it attributed to higher exposition corrasive agents (i.e., moving clasts) compared other areas valve. Neither nor recorded, being less prevalence these taphonomic features low salinity conditions study area.