L'Imposex: el seu estudi i evolució en Bolinus brandaris

Authors

  • Maria José Amor
  • Montserrat Ramón Herrero
  • Alexandra Richter
  • Mercè Durfort i Coll

Abstract

The present work represent a case study of the evolution of the imposex phenomena in the Mediterranean sea. The presence of males secondary sexual characters in females caused by the TBT pollution of the sea water has been monitored during the last 11 years in the gastropod Bolinus brandaris, a commercially exploited neogastropod species with a distribution area extending along the whole Mediterranean sea and nearby Eastern Atlantic coast. The provenience of the monitored animals were from St. Carles de la Ràpita (Tarragona, Northeast coast of Spain). During the first seven years, females with imposex made up more than 90% of the population, in spite of the application of restrictive laws prohibiting the extensive usage of antifouling paints with TBT. The results of the study reveal the existence of some differences among functional males and imposex affected females in the histology and ultrastructural organization of the penis and vas deferent. The results also show a trend in the decrease of the percentage of females exhibiting imposex in the last three years. Besides, available data from the present year point to its almost complete disappearance in St. Carles de la Ràpita.

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Published

2009-04-24