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| Identifier |
000397314 |
| Title |
Το φαινόμενο του imposex και η συσχέτιση του με τη συγκέντρωση των οργανοκασσιτερικών ενώσεων στα θαλάσσια γαστερόποδα Hexaplex trunculus και Nassarius nitidus |
| Alternative Title |
Imposex and organotin compounds in marine gastropods Hexaplex trunculus and Nassarius nitidus |
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Author
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Αναστασίου, Θεοκλητεία Ι.
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Thesis advisor
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Αρβανιτίδης, Χρήστος
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Reviewer
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Καρακάσης, Ιωάννης
Κωτούλας, Γεώργιος
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| Abstract |
Organotin compounds are toxic substances released into the marine environment through antifouling paints. Sixty two years following their first application, the negative impacts caused on molluscs are still evident, as illustrated by imposex, which is the masculinization of female prosobranch gastropods. This phenomenon is widely used as a biomarker of tributyltin (TBT) pollution. Hexaplex trunculus and Nassarius nitidus are gastropods that show significant sensitivity against organotin pollution and are, therefore, used as bionidicators for monitoring TBT pollution in coastal waters. In the present study sediment samples and specimens of H. trunculus collected from Sardinia, Tunisia and Portugal were used for the assessment of the intensity of imposex and the organotin contamination of these areas. At the same time, individuals of the species N. nitidus from Portugal were studied, in order to determine which one is the most sensitive gastropod featuring imposex as a response to TBT contamination. Morphological and chemical analyses revealed that, despite its complete ban, TBT continues to be present in the marine environment and to cause imposex. Its intensity is related to the degree of shipping activities. Moreover, the results suggested a possible synergistic effect of TPhT in the development of imposex. In H. trunculus the first sign of imposex is the appearance of a penis or a penis duct in females and may lead to sterility in the final stage. Furthermore, genital track malformations can be developed in both sexes. The positive correlation of penis length with the organotin compounds concentration in gastropods' tissues enables a rapid assessment of their accumulation in the tissues of organisms. However, more detailed studies are necessary in order to determine which one of the two species would be the most sensitive bioindicator to TBT exposure.
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| Language |
Greek |
| Subject |
Οργανοκασσιτερικές ενώσεις |
| Issue date |
2015-11-20 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
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Type of Work--Post-graduate theses
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| Views |
295 |
Το φαινόμενο του imposex και η συσχέτιση του με τη συγκέντρωση των οργανοκασσιτερικών ενώσεων στα θαλάσσια γαστερόποδα Hexaplex trunculus και Nassarius nitidus
