Identification of food sources of invertebrates from the seagrass Zostera marina community using carbon and sulfur stable isotope ratio and fatty acid analyses

作者：VI Kharlamenko, SI Kiyashko, AB Imbs, DI Vyshkvartzev · 发表于：Marine Ecology Progress Series · 年份：2001 · DOI：10.3354/meps220103 · 被引用次数：357 · 研究领域：Isotope Analysis in Ecology、Marine Bivalve and Aquaculture Studies、Food Industry and Aquatic Biology

Carbon and sulfur stable isotope ratios, as well as fatty acid composition of tissues, of dominant consumer species were determined and compared to those of potential food sources in an isolated community of Zostera marina in a shallow, semi-enclosed inlet of the Sea of Japan.Of the 6 dominant species of invertebrates, 4 species were enriched in 13 C, compared to all sampled carbon sources alternative to Z. marina.Among them, the grazing gastropods Littorina squalida and Homalopoma sangarense exhibited the most enriched δ 13 C values.On the dual δ 13 C versus δ 34 S plot, these mollusks occupy an intermediate position between Z. marina and epiphytes, suggesting nearly equal proportions of organic carbon from both nutritional sources.In lipids of H. sangarense there was a high content of the 18:1(n-7) acid characteristic of aerobic bacteria; however, another grazer (L.squalida) showed the lowest content of bacterial fatty acids among all consumers.Other highly 13 C-enriched consumers were the surface-deposit-feeding mollusks, the gastropod Batillaria cumingii and the bivalve Macoma incongrua; however, their δ 34 S values were markedly lower than those of any of the primary producers sampled, including Z. marina.Although the high δ 13 C values of grazers and surface-deposit feeders are suggestive of a great contribution of Z. marina organic carbon, no substantial concentrations of seagrass marker fatty acids were detected.Significant interspecific variations of both the sulfur ...