Intersex in the clam Scrobicularia plana (Da Costa): Widespread occurrence in English Channel estuaries and surrounding areas.
Identifieur interne : 000168 ( France/Analysis ); précédent : 000167; suivant : 000169Intersex in the clam Scrobicularia plana (Da Costa): Widespread occurrence in English Channel estuaries and surrounding areas.
Auteurs : N D Pope [Royaume-Uni] ; K. Childs [Royaume-Uni] ; C. Dang [France] ; M S Davey [Royaume-Uni] ; S C M. O'Hara [Royaume-Uni] ; K. Langston [Royaume-Uni] ; C. Minier [France] ; P L Pascoe [Royaume-Uni] ; E. Shortridge [Royaume-Uni] ; W J Langston [Royaume-Uni]Source :
- Marine pollution bulletin [ 1879-3363 ] ; 2015.
Descripteurs français
- Wicri :
- geographic : France.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Water Pollutants, Chemical.
- chemical , metabolism : Water Pollutants, Chemical.
- chemical , toxicity : Water Pollutants, Chemical.
- geographic : France, Great Britain.
- physiology : Bivalvia.
- Animals, Disorders of Sex Development, Environmental Monitoring, Estuaries, Female, Male, Sex Ratio.
Abstract
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 incidence or severity of intersex; or 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.
DOI: 10.1016/j.marpolbul.2015.02.039
PubMed: 25837773
Affiliations:
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pubmed:25837773Le document en format XML
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<term>Estuaries</term>
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<front><div type="abstract" xml:lang="en">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 incidence or severity of intersex; or 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.</div>
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