Intersex in the clam Scrobicularia plana (Da Costa): Widespread occurrence in English Channel estuaries and surrounding areas

Pope, ND; Childs, K; Dang, C; Davey, MS; O'Hara, SCM; Langston, K; Minier, C; Pascoe, PL; Shortridge, E; Langston, WJ. 2015 Intersex in the clam Scrobicularia plana (Da Costa): Widespread occurrence in English Channel estuaries and surrounding areas [in special issue: The English Channel and it's Catchments: Status and Responses to Contaminants] Marine Pollution Bulletin, 95 (2). 598-609. 10.1016/j.marpolbul.2015.02.039

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Abstract/Summary

Estuarine clams Scrobicularia plana were sampled from 108 intertidal locations around the English Channel and adjacent areas. Although S. plana is believed to be a strict gonochorist, 58% of the populations sampled included intersexed individuals (described as male clams exhibiting ovotestis). Over the entire region, on average, 8.6% of male clams exhibited intersex, although proportions of affected males ranged from 0% to 53% depending on location. The severity of intersex was assessed using a simple classification scale, with the majority of individuals showing low levels of impact. Sex ratios were significantly skewed at some sites. There were no significant relationships between the incidence and severity of intersex; or of associations with size or parasitism of individual clams. Intersex in S. plana is a useful tool to assess endocrine disruptive effects in estuaries, although mechanisms of impact and causative agents remain uncertain.

Item Type: Publication - Article
Divisions: Marine Biological Association of the UK > Ecosystems and Environmental Change > Behaviour and effects of contaminants
Depositing User: Dr Nick Pope
Date made live: 10 Sep 2015 09:32
Last Modified: 06 Jun 2017 16:13
URI: http://plymsea.ac.uk/id/eprint/6533

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