Imposex occurrence in the changeable nassa Nassarius (Sphaeronassa) mutabilis (Linnaeus, 1758) was confirmed in the present study. Advanced imposex stages were discovered for the first time in this nassarid starting from the initial appearance of the vas deference sequence or the bud penis (VDS1), to the point where this duct reaches the vaginal opening (VDS4). Three types of imposex pathways were found for stage 1 (VDS1a, VDS1b and VDS1d), two for stage 2 (VDS2a and VDS2d) and stage 3 (VDS3a and VDS3b). Affected females were found in the three studied stations with imposex frequency ranging from 10.5 to 47.2%, VDSI from 0.1 to 0.8, FPL from 0 to 0.1 mm, RPLI from 0 to 0.9, and VDL from 0.2 to 1.3 mm. Organotins body burden ranged from 0.8 to 16 ng/g d.w. for MBT, 2.5–14.9 for DBT, and 3.7–14.4 for TBT. To our knowledge, this is the first detailed report on imposex in N. mutabilis suggests its inclusion to list of imposex-affected gastropods.
Russian Journal of Marine Biology – Springer Journals
Published: Mar 25, 2013
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