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Imposex in Hexaplex trunculus (Gastropoda: Muricidae): first results from biomonitoring of tributyltin contamination in the Mediterranean

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Abstract

Imposex (the occurrence of penis and vas deferens in females) in Hexaplex trunculus collected from Malta (Central Mediterranean) in 1992 is reported. This phenomenon is related to the levels of tributyltin (TBT) in the organisms as well as in sediments. Imposex indices (relative penis size and vas deferens sequence) are used to biomonitor coastal contamination by TBT for the first time in the Mediterranean. In its response to TBT, H. trunculus is ranked as one of the most sensitive neogastropod species studied so far. Accumulation of TBT and its metabolites in the digestive glands, gonads and the rest of the body are described, and sex-related differences are shown. No preferential female mortalities are recorded in populations exposed to high levels of TBT. However, a reported shift in the size frequency distribution of H. trunculus in contaminated sites, towards bigger snails, may suggest reduced reproductive potential.

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Authors and Affiliations

  1. Marine Ecotoxicology Laboratory, Department of Biology, University of Malta, Msida, Malta

    V. Axiak, D. Micallef & P. Chircop

  2. Department of Chemistry, University of Malta, Msida, Malta

    A. J. Vella & B. Mintoff

Authors
  1. V. Axiak
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  2. A. J. Vella
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  3. D. Micallef
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  4. P. Chircop
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  5. B. Mintoff
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Communicated by O. Kinne, Oldendorf/Luhe

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Axiak, V., Vella, A.J., Micallef, D. et al. Imposex in Hexaplex trunculus (Gastropoda: Muricidae): first results from biomonitoring of tributyltin contamination in the Mediterranean. Marine Biology 121, 685–691 (1995). https://doi.org/10.1007/BF00349304

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  • DOI: https://doi.org/10.1007/BF00349304

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