The study of fatty acid biomarkers in trophic structures at sub-polar latitudes is fundamental in describing energy fluxes across ecosystems characterized by complex inter-specific interactions. Due to the presence of certain essential fatty acids obtained exclusively from predator–prey interactions, fatty acid biomarkers are widely used to identify trophic interactions. This study analyzed fatty acid compositions in three species inhabiting a relatively pristine Patagonian fjord. This fjord is geographically difficult to access, so there are very little sampling opportunities, biological and oceanographic information. In the three species collected ( Ctenodiscus australis (Loven in Lütken 1871) (Echinodermata, Asteroidea, Ctenodiscidae); Munida gregaria (Fabricius 1793) (Arthropoda, Malacostraca, Munididae); Eleginops maclovinus (Cuvier 1830) (Chordata, Actinopterygii, Eleginopsidae)) along this remote area were evaluated their fatty acid trophic markers as a tool to differentiate dietary components and dietary habits. The study reported significant differences in the amount of saturated fatty acids (SFA), monounsaturated fatty acids (MUFA), and polyunsaturated fatty acids (PUFA), with the highest concentrations of all fatty acids in M. gregaria . The last suggests that M. gregaria is considered as a good quality food source or biological component that might support the fjord trophic web in the Southern Hemisphere. The results describe diet compositions in sampled species, and differences among species for fatty acid compositions and proportions. This provides an initial basis for future modeling or projecting how benthic ecosystems of fjords and Patagonian channels respond to food intake, particularly in environments associated with glacial systems characterized by a low phytoplankton biomass and greater sensitivity to climate variability.

中文翻译：

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居住在高纬度巴塔哥尼亚峡湾（智利 Yendegaia 峡湾）的三个物种的脂肪酸生物标志物

亚极纬度营养结构中脂肪酸生物标志物的研究对于描述以复杂的种间相互作用为特征的生态系统中的能量通量至关重要。由于存在某些完全从捕食者-猎物相互作用中获得的必需脂肪酸，脂肪酸生物标志物被广泛用于识别营养相互作用。这项研究分析了居住在相对原始的巴塔哥尼亚峡湾的三个物种的脂肪酸组成。这个峡湾在地理上很难进入，因此采样机会、生物和海洋学信息很少。在收集的三个物种中（ Ctenodiscus australis (Loven in Lütken 1871) (Echinodermata, Asteroidea, Ctenodiscidae); Munida gregaria (Fabricius 1793) (Arthropoda, Malacostraca, Munididae); 沿着这个偏远地区的 Eleginops maclovinus (Cuvier 1830) (Chordata, Actinopterygii, Eleginopsidae)) 评估了它们的脂肪酸营养标记，作为区分饮食成分和饮食习惯的工具。该研究报告了饱和脂肪酸 (SFA)、单不饱和脂肪酸 (MUFA) 和多不饱和脂肪酸 (PUFA) 的含量存在显着差异，其中 M. gregaria 中所有脂肪酸的浓度最高。最后一个表明 M. gregaria 被认为是一种优质的食物来源或生物成分，可能支持南半球的峡湾营养网。结果描述了采样物种的饮食组成，以及物种之间脂肪酸组成和比例的差异。