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  • intersex  (3)
  • 1995-1999  (3)
  • 1990-1994
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  • 1995-1999  (3)
  • 1990-1994
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Littorina littorea ; prostate gland ; histology ; intersex ; female stage 3
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003222629596
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Nucella lapillus ; Littorina littorea ; imposex ; intersex ; TBT effect monitoring ; geographical differences
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003218411850
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Hydrobia ulvae ; Littorina littorea ; imposex ; intersex ; reproductive failure ; TBT biomonitoring ; TBT biomonitoring
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003270528688
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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