Abstract
Populations of dogwhelks Nucella lapillus in areas of high boating activity on the Northumbrian coast had severe symptoms of imposex when they were sampled in 1986. They had high RPSI scores, male-biased sex ratios (probably due to high female mortality) and poor reproductive performance. There has however been marked recovery of these populations since the partial ban on the use of anti-fouling paints containing triorganotin compounds in 1987. RPSI values are lower, recruitment has improved and there is evidence of better survivorship of females.
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