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  • Littorina littorea  (3)
  • biomonitoring  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Marisa cornuarietis (Gastropoda, prosobranchia): a potential TBT bioindicator for freshwater environments (1995)
    Springer
    Ecotoxicology 4 (1995), S. 372-384 
    Details
    ISSN: 1573-3017
    Keywords: Imposex ; TBT pollution ; biomonitoring ; reproduction ; Marisa cornuarietis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: The ramshorn snail Marisa cornuarietis (L., 1767) exhibits imposex (occurrence of male parts in addition to the female genital duct) under the influence of TBT (tributyltin) in laboratory experiments and accumulates this biocide in a time-and concentration-dependent manner. A comparison of BCF (bioconcentration factors) demonstrates that this limnic species accumulates more TBT than marine species. Evidence is given that TBT causes hormonal disorders which are responsible for imposex development. The testosterone/oestradiol quotient reflects the imposex development which can be described by a classification scheme differentiating four stages in Marisa cornuarietis. In the background of the constantly increasing organotin concentration in the limnic environment Marisa cornuarietis could be a well-suited bioindicator for TBT pollution. No other limnic species with a lower threshold concentration for measurable TBT effects is reported within the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00118872
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Imposex in Nucella lapillus and intersex in Littorina littorea: interspecific comparison of two TBT-induced effects and their geographical uniformity (1998)
    Springer
    Hydrobiologia 378 (1998), S. 199-213 
    Details
    ISSN: 1573-5117
    Keywords: Nucella lapillus ; Littorina littorea ; imposex ; intersex ; TBT effect monitoring ; geographical differences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two different tributyltin (TBT)-induced virilisation phenomena in prosobranch snails – intersex in Littorina littorea and imposex in Nucella lapillus – are compared in order to facilitate their simultaneous use in geographical large scale effect monitoring surveys. Imposex in dogwhelks is a more sensitive biomarker and should be used in areas that are only slightly or moderately contaminated with TBT (ambient TBT concentrations 〈 2.0 ng as Sn l-1). The assessment of intersex intensities in periwinkle populations has considerable advantages in areas with higher TBT concentrations and should be used also wherever dogwhelks are absent irrespective of the TBT exposure level. The intersex index (ISI) and vas deferens sequence (VDS) index are proposed as the most suited parameters for effect monitoring purposes. The geographical uniformity of intersex and imposex is analysed and proven for the coasts of Ireland, France, and Germany. A relative loss of TBT sensitivity in females can be found, but to a varying extent in both species. The implications of this result for biological TBT effect monitoring programmes are discussed in light of the fact that intersex and imposex have both been found to be irreversible. Because it is the objective of these programmes to assess current TBT contaminations and resulting biological effects, only relatively young specimens should be considered in the sampling strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003218411850
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  • 3
    Electronic Resource
    Electronic Resource
    Toxico-kinetic and -dynamic aspects of TBT-induced imposex in Hydrobia ulvae compared with intersex in Littorina littorea (Gastropoda, Prosobranchia) (1998)
    Springer
    Hydrobiologia 378 (1998), S. 215-225 
    Details
    ISSN: 1573-5117
    Keywords: Hydrobia ulvae ; Littorina littorea ; imposex ; intersex ; reproductive failure ; TBT biomonitoring ; TBT biomonitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A short description of the imposex condition in Hydrobia ulvae is presented. In this species four different imposex stages with two types of development were identified. In laboratory experiments the mud snail accumulates TBT in a time and concentration-dependent manner. Increasing biological indices e.g. VDSI (vas deferens sequence index), female penis length (FPL) and the imposex incidence are significantly correlated with increasing TBT body burden. The percentage of sterile females depends on the TBT contamination of sediments. An interspecific comparison of the mud snail H. ulvae and the periwinkle Littorina littorea elucidates that the mud snail is the more sensitive species at lower environmental TBT concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003270528688
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure of prostate gland tissue in males and females with intersex phenomena of Littorina littorea L. (1998)
    Springer
    Hydrobiologia 378 (1998), S. 227-233 
    Details
    ISSN: 1573-5117
    Keywords: Littorina littorea ; prostate gland ; histology ; intersex ; female stage 3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the prosobranch snail Littorina littorea (L., 1758) the ultrastructure of the prostate gland cells (pgc) in males and the altered glandular epithelium of the pallial oviduct of females in intersex stage 3 is compared. Regarding form, structure, organelles and secretory products the pgc in males are identical with the corresponding gland cells of the females. Consequently these results demonstrate that in females of intersex stage 3 the epithelium of the pallial oviduct, which originally consists of several (3) glandular parts, is transformed into a male prostate gland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003222629596
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