Intersex in the clam Scrobicularia plana (Da Costa): Widespread occurrence in English Channel estuaries and surrounding areas
| Autor: | K.M. Langston, Katherine Childs, P.L. Pascoe, M. Davey, E. Shortridge, Christophe Minier, C. Dang, ND Pope, W.J. Langston, S.C.M. O'Hara |
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| Rok vydání: | 2014 |
| Předmět: |
Male
endocrine system animal structures Disorders of Sex Development Intertidal zone Parasitism Aquatic Science Oceanography Animals Sex Ratio Scrobicularia plana geography geography.geographical_feature_category biology Ovotestis Incidence (epidemiology) Estuary biology.organism_classification Pollution United Kingdom Bivalvia Fishery Female France Estuaries Channel (geography) Sex ratio Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Marine pollution bulletin. 95(2) |
| ISSN: | 1879-3363 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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