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image of Crustaceana

The fatty acid composition of the barnacles Hesperibalanus hesperius and Balanus rostratus, taken from the epibiosis of the bivalve mollusc Patinopecten (Mizuhopecten) yessoensis, collected at two different sites in the Sea of Japan, was analysed. Fatty acid markers were used to determine the food sources of these barnacles. Differences in the fatty acid contents of barnacles of different sizes (ages) arise from the increasing variety of food sources. The distribution of fatty acid markers in the young of both species reflects the detrital origin of their food and additionally indicates that small barnacles are predominantly scavengers (necrophagous). With increasing size of the small species H. hesperius, the proportion of the fatty acids, which are characteristic for diatoms, increases. Adult B. rostratus contained large amounts of fatty acids, typical of diatoms, indicating a strong evidence of a dietary input of diatoms. The resemblance of the fatty acid compositions of both species of similar size and from the same environment, thus is the result of the similarity of the food supplied.

La composition en acides gras des balanes Hesperibalanus hesperius et Balanus rostratus, prélevées sur des épibioses du mollusque bivalve Patinopecten (Mizuhopecten) yessoensis collecté en différents sites de la mer du Japon, a été analysée. Des marqueurs en acides gras ont été utilisés pour déterminer les sources alimentaires de ces balanes. Les différences dans les teneurs en acides gras chez les balanes de différentes tailles (âges) résultent de la variété croissante des sources de nourriture. La distributions des marqueurs en acides gras chez les jeunes des deux espèces reflète l'origine détritique de leur nourriture et, de plus, que les petites balanes sont surtout détritivores (nécrophages). Avec l'accroissement de taille de la petite espèce, H. hesperius, la proportion d'acides gras, typiques des diatomées, s'accroît. Les B. rostratus adultes contenaient de fortes proportions d'acides gras, typiques des diatomées, ce qui indique manifestement une consommation alimentaire de diatomées. La ressemblance des compositions en acides gras chez les deux espèces, à taille similaire et dans le même environnement, résulte le plus probablement de la similarité des nourritures.

Affiliations: 1: Institute of Marine Biology, Far East Branch, Russian Academy of Sciences, Palchevskogo 17, Vladivostok 690041, Russia


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