Imposex

Imposex is a disorder in sea snails caused by the toxic effects of certain marine pollutants. These pollutants cause female sea snails (marine gastropod molluscs) to develop male sex organs such as a penis and a vas deferens.

Imposex inducing substances
Tributyltin (TBT) hydride model

It was believed that the only inducer of imposex was tributyltin (TBT),[1] which can be active in extremely low concentrations, but recent studies reported other substances as inducers, such as triphenyltin[2] and ethanol.[3] Tributyltin is used as an anti-fouling agent for boats which affects females of the species Nucella lapillus (dog whelk), Voluta ebraea (the Hebrew volute),[4] Olivancillaria vesica,[5] Stramonita haemastoma[6] (red-mouthed rock shell) and more than 200 other marine gastropods.

Abnormalities

In the dog whelk, the growth of a penis in imposex females gradually blocks the oviduct, although ovule production continues. An imposex female dog whelk passes through several stages of penis growth before it becomes unable to maintain a constant production of ovules. Later stages of imposex lead to sterility and the premature death of the females of reproductive age, which can adversely affect the entire population.[4]

In 1993, Scientists from the Plymouth Marine Laboratory found a thriving dog-whelk population in the Dumpton Gap, near Ramsgate in the UK despite high levels of TBT in the water.[7] In the Dumpton Gap population, only 25% of females showed any significant signs of imposex, while 10% of males were characterized by the absence of a penis or an undersized penis, with incomplete development of the vas deferens and prostate. After further experiments, scientists concluded that "Dumpton Syndrome" was a genetic selection caused by high TBT levels. TBT-resistance was improved at the cost of lower reproductive fitness.

Biomonitoring

The imposex stages of female dog whelks and other molluscs (including Nucella lima) are used in the United Kingdom and worldwide to monitor levels of tributyltin. The RPSI (Relative Penis Size Index) of females to males, and the VDSI (Vas Deferens Sequence Index) are used to monitor levels of tributyltin in marine environments.

A ban on tributyltin was implemented in Canada in 2003, however, in 2006, dog whelks with imposex could still be found on the shores of Halifax Harbour in Nova Scotia.[8]

See also

References
  1. Ruiz JM, Quintela M, Barreiro R (1998) Tributyltin and imposex: no uncertainty shown. Mar Ecol Prog Ser 170: 293–294
  2. Horiguchi, T.; et al. (1995). "Imposex in Japanese gastropods (Neogastropoda and Mesogastropoda): effects of tributyltin and triphenyltin from anti-fouling paints". Marine Pollution Bulletin. Oxford. 31 (4–12): 402–405. doi:10.1016/0025-326X(95)00133-8.
  3. Davies, I. M.; et al. (1997). "Sublethal effects of tributyltin oxide on thedog whelk Nucella lapillus". Marine Ecology Progress Series. 158: 191–204. Bibcode:1997MEPS..158..191D. doi:10.3354/meps158191.
  4. Castro, Í. B.; et al. (2008). "Imposex in endemic volutid from Northeast Brazil (Mollusca: Gastropoda)" (PDF). Brazilian Archives of Biology and Technology. Brazil. 51 (5): 1065–1069. doi:10.1590/s1516-89132008000500024. ISSN 1516-8913.
  5. Caetano, C. H. S.; Absalão, R. S. (2002). "Imposex in Olivancillaria vesica vesica (Gmelin) (Gastropoda, Olividae) trom a Southeastern Brazilian sandy beach" (PDF). Revista Brasileira de Zoologia. Brazil: Sociedade Brasileira de Zoologia. 19 (2): 215–218. doi:10.1590/S0101-81752002000600022. ISSN 0101-8175.
  6. Fernandez, M. A.; et al. (2002). "Occurrence of imposex in Thais haemastoma: possible evidence of environmental contamination derived from organotin compounds in Rio de Janeiro and Fortaleza, Brazil". Cadernos de Saúde Pública. Rio de Janeiro, Brazil: Fundação Oswaldo Cruz. 18 (2): 463–476. doi:10.1590/S0102-311X2002000200011. ISSN 0102-311X. PMID 11923888.
  7. Gibbs, Journal of the Marine Biological Association, 1993, vol 73, p 667
  8. Coray, Camille; Bard, Shannon M. (1 May 2007). "Persistence of Tributyltin-Induced Imposex in Dogwhelks (Nucella lapillus) and Intersex in Periwinkles (Littorina littorea) in Atlantic Canada". Water Quality Research Journal. 42 (2): 111–122. doi:10.2166/wqrj.2007.014.
  • Gibbs, P.E., Bryan, G.W. (1986). Reproductive failure in populations of the dog-whelk Nucella lapillus, caused by imposex induced by tributyltin from antifouling paints. J. Mar. Biol. Assoc. U. K. 66: 767–777.
  • "Occurrence of Imposex." Natural Resource Management. 2006.
  • Wirzinger, G., Vogt, C., Bachmann, J., Hasenbank, M., Liers, C., Stark, C., Ziebard, S. & Oehlmann, J. (2007). Imposex of the netted whelk Nassarius reticulatus (Prosobranchia) in Brittany along a transect from a point source. Cah. Biol. Mar. 48(1): 85–94.
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