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espanolLa almeja asiatica, Corbicula fluminea, es una de las once especies bentonicas de mayor impacto segun la lista DAISIE (DAISIE – Delivering Alien Invasive Species Inventories for Europe), debido a su impacto tanto ambiental como socioecono- mico. Este articulo describe la distribucion y la dinamica de una poblacion bien establecida del bivalvo exotico Corbicula fluminea en el arroyo Vernavola, un afluente de la parte derecha del rio Ticino (Pavia, norte de Italia). Ademas, se realizo un experimento de laboratorio para investigar la preferencia de sustrato de este bivalvo, probando tres tipos diferentes: grava media, grava fina y arena media. La mayor densidad de la almeja asiatica se registro en las partes del arroyo donde el fondo estaba compuesto principalmente de arena mezclada con grava fina. Los resultados del experimento indicaron una fuerte preferencia por la arena sobre otros sustratos. Con el fin de evaluar en el futuro la contaminacion biologica de la almeja asiatica Corbicula fluminea, seria util conocer mas su autoecologia y controlar constantemente la dinamica de su poblacion. EnglishThe Asiatic clam, Corbicula fluminea, is among the eleven benthic species with the highest impact in the DAISIE list (DAISIE – Delivering Alien Invasive Species Inventories for Europe) because it has both environmental and socio-economic impacts. This paper reports the distribution and the dynamics of a well-established population of the alien bivalve Corbicula fluminea in the Vernavola Stream, a left-side tributary of the sub-lacustrine Ticino River (Pavia, Northern Italy). Additionally, we performed a laboratory experiment to investigate the substrate preference of the invasive bivalve, testing three different types of substrate: medium gravel, fine gravel and medium sand. The highest density of the Asiatic clam was registered in the parts of the stream where the bottom was mainly composed of sand mixed with fine gravel. The results of the experiment indicated a strong preference for sand over other substrates. In order to assess the future development of biological pollution from the Asiatic clam Corbicula fluminea, it would be useful to increase our knowledge of its autoecology and to constantly monitor its population dynamics

limnética/limnética

Case study of the Vernavola Stream (sub-lacustrine Ticino River basin, Northern Italy): the biological pollution of the Asiatic clam Corbicula fluminea (Müller, 1774)