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Table 1 The vas deferens sequence index (VDSI) in female B. areolata during the 6 months of exposure to different nominal TBT concentrations

From: Ultrastructure of oogenesis in imposex females of Babylonia areolata (Caenogastropoda: Buccinidae)

TBT concentrations (ng as Sn/l) Vas deferens sequence index (mean ± SE)
Exposure time (months)
1 2 3 4 5 6
0 (control) 0 0 0 0 0 0
1 1.0 ± 0.2 1.2 ± 0.2 1.4 ± 0.3 1.2 ± 0.2 1.7 ± 0.7 1.0 ± 0.2
10 1.3 ± 0.3 1.4 ± 0.4 2.3 ± 0.5 1.9 ± 0.4 2.0 ± 0.4 1.8 ± 0.4
50 1.0 ± 0.2 1.7 ± 0.4 1.9 ± 0.4 1.4 ± 0.3 2.3 ± 0.4 1.5 ± 0.3
100 1.2 ± 0.2 1.8 ± 0.4 1.8 ± 0.3 2.2 ± 0.3 2.6 ± 0.4 2.1 ± 0.3
500 1.2 ± 0.2 1.7 ± 0.3 2.0 ± 0.3 2.2 ± 0.4 2.4 ± 0.3 3.0 ± 0.3