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Fréquence et degré d'expression du pseudohermaphrodisme chez quelques prosobranches stenoglosses des côtes françcaises (surtout de la baie de Morlaix et de la Manche) 2. Situation jusqu'au printemps 1992 = Imposex of some Meso and Neogastropods living on the French coasts (Morlaix Bay and English Channel). 2. Situation to spring 1992
Oehlmann, J.; Stroben, E.; Fioroni, P. (1993). Fréquence et degré d'expression du pseudohermaphrodisme chez quelques prosobranches stenoglosses des côtes françcaises (surtout de la baie de Morlaix et de la Manche) 2. Situation jusqu'au printemps 1992 = Imposex of some Meso and Neogastropods living on the French coasts (Morlaix Bay and English Channel). 2. Situation to spring 1992. Cah. Biol. Mar. 34(3): 343-362
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Oehlmann, J.
  • Stroben, E.
  • Fioroni, P.

Abstract
    The further development of imposex on the French coasts (namely Brittany and Normandy) is analysed for 10 species of Meso- and Neogastropods (20,560 individuals). Beside the species already mentioned in 1988 (Fioroni et al., 1991a) our description includes also Lamellaria perspicua, Trivia arctica, T. monacha, Ocinebrina aciculata and Colus gracilis. New stages/types of imposex (Fig. 2) allow a new evolutionary system of imposex valid in all species. The frequency of imposex attains mostly 100%; the VDS index is the best parameter for its intensity. Despite the official restrictions in the use of TBT (tributyltin), imposex has still more advanced namely in the Muricidae and attains in several species sterility and a shift of the sex ratio in favour of males (Ocinebrina aciculata, Nucella lapillus). Despite the general increase of imposex, the localities distant from harbours have conserved their favoured position.

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