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Imposex in populations of dogwhelks Thais spp. in relation to shipping intensity and mariculture activity in east Asia

Lookup NU author(s): Emeritus Professor Stewart Evans

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Abstract

Imposex was recorded in samples of dogwhelks Thais spp. from each of the sites surveyed in Hong Kong and Singapore, and the majority of those in Phuket and Penang. There was no imposex in samples from Langkawi. The most advanced symptoms were those from shores close to commercial harbours, marinas and mariculture sites, suggesting that tributyltin (TBT) is a primary cause of the condition. All females were categorised as sterile from four sites on Hong Kong. In these cases recruitment has probably occurred as a result of the dispersal of larvae from fecund populations elsewhere. However, severe imposex was surprisingly localised, even in Hong Kong. There was evidence of decreasing symptoms of imposex with increasing distance from centres of shipping activity.

Publication metadata

Author(s): Evans SM, Bech M, Hawkins ST, Smith R, Stewart A

Publication type: Article

Publication status: Published

Journal: Invertebrate Reproduction and Development

Year: 2001

Volume: 39

Issue: 3

Pages: 231-237

Print publication date: 01/01/2001

ISSN (print): 0792-4259

ISSN (electronic):

Publisher: Balaban Publishers International Science Services

URL: http://dx.doi.org/10.1080/07924259.2001.9652487

DOI: 10.1080/07924259.2001.9652487

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