National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690041, Russian Federation.
Lipids. 2020 May;55(3):291-296. doi: 10.1002/lipd.12227. Epub 2020 Feb 26.
Fatty acids (FA) of two species of abyssal Echinodermata-the sea star (Asteroidea) Eremicaster vicinus and the sea urchin (Echinoidea) Kamptosoma abyssale-from the Kuril-Kamchatka Trench, collected at depths of 5210 and 6183 m, were analyzed. Lipids of these deposit-feeding animals showed similar FA compositions: 20.05-16.08% saturated, 42.20-39.50% monoenoic, and 37.75-44.42% polyunsaturated FA, respectively. The contents of odd- and branched-chain FA were 17.35% and 8.80%, respectively. A significant part of FA was represented by uncommon FA such as 21:4(n-7), 22:4(n-8), 22:5(n-5), and 23:4(n-9), earlier discovered in deep-sea foraminifera. Also, the newly found acid, related to the ω2 family, Δ5,8,11,14,17,20-22:6(n-2), amounted 1.60% and 0.33% of total FA, respectively, for the two species. Such unusual FA composition of these abyssal species can be explained by the transfer and modification of FA from consumed foraminifera, which in turn, feed on bacteria.
分析了来自库页-堪察加海沟（水深分别为 5210 和 6183 米）的两种深海棘皮动物（海星纲的 Eremicaster vicinus 和海胆纲的 Kamptosoma abyssale）的脂肪酸（FA）。这些滤食性动物的脂质具有相似的 FA 组成：饱和 FA 分别为 20.05-16.08%、单烯 FA 为 42.20-39.50%和多不饱和 FA 为 37.75-44.42%。奇数和支链 FA 的含量分别为 17.35%和 8.80%。相当一部分 FA 由不常见的 FA 组成，如 21:4(n-7)、22:4(n-8)、22:5(n-5)和 23:4(n-9)，这些 FA 早些时候在深海有孔虫中被发现。此外，两种物种的 FA 中分别有 1.60%和 0.33%属于新发现的酸，属于ω2 家族，Δ5,8,11,14,17,20-22:6(n-2)。这些深海物种如此不寻常的 FA 组成可以通过从消耗的有孔虫中转移和修饰 FA 来解释，而有孔虫则反过来以细菌为食。
