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Carbon and nitrogen stable isotope ratios were measured in skin and muscle tissues of stranded and by-caught dolphins from six geographical areas in the Mediterranean Sea and Atlantic Ocean. Variation in \u03b4<jats:sup>15<\/jats:sup>N in relation to dolphin size is attributed to changes in diet. Nursing calves have a higher trophic level than weaned animals and their \u03b4<jats:sup>15<\/jats:sup>N values decrease progressively until weaning, estimated to be at a body length of around 155\u00a0cm. \u03b4<jats:sup>15<\/jats:sup>N values then increased for larger individuals which suggests changes in diet for mature dolphins. Geographical differences in diet were apparent between the Atlantic and the Mediterranean, although no clear differences were apparent between the five Mediterranean areas. Comparisons of the nitrogen isotope ratios of skin and muscle highlighted a higher fractionation in skin compared to the muscle tissue. Values of \u03b4<jats:sup>13<\/jats:sup>C also increased with body length although it appears that this is not only driven by trophic level enrichment. \u03b4<jats:sup>13<\/jats:sup>C increases before weaning and the difference in trophic level between newly-weaned and mature dolphins was twice as high for carbon as for nitrogen. Ontogenetic changes in carbon isotope composition may therefore be driven by feeding on deep water prey and dolphin movements outside the coastal feeding grounds. Indeed, seasonal variations in \u03b4<jats:sup>13<\/jats:sup>C are suspected to be driven by migration within the Mediterranean basin.<\/jats:p>","DOI":"10.1017\/s0025315411001457","type":"journal-article","created":{"date-parts":[[2011,9,13]],"date-time":"2011-09-13T10:00:43Z","timestamp":1315908043000},"page":"1677-1687","source":"Crossref","is-referenced-by-count":36,"title":["Feeding ecology of striped dolphins, <i>Stenella coeruleoalba<\/i>, in the north-western Mediterranean Sea based on stable isotope analyses"],"prefix":"10.1017","volume":"92","author":[{"given":"A.M.","family":"Meissner","sequence":"first","affiliation":[]},{"given":"C.D.","family":"MacLeod","sequence":"additional","affiliation":[]},{"given":"P.","family":"Richard","sequence":"additional","affiliation":[]},{"given":"V.","family":"Ridoux","sequence":"additional","affiliation":[]},{"given":"G.","family":"Pierce","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2011,9,13]]},"reference":[{"key":"S0025315411001457_ref11","doi-asserted-by":"publisher","DOI":"10.1007\/s003000050245"},{"key":"S0025315411001457_ref22","doi-asserted-by":"publisher","DOI":"10.1007\/s00227-011-1629-3"},{"key":"S0025315411001457_ref65","first-page":"137","volume-title":"The status and distribution of cetaceans in the Black Sea and Mediterranean Sea","author":"Reeves","year":"2006"},{"key":"S0025315411001457_ref59","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.es.18.110187.001453"},{"key":"S0025315411001457_ref21","unstructured":"Desportes G. 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