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Fatty acid stable isotopes add clarity, but also complexity, to tracing energy pathways in aquatic food webs
Ecosphere ( IF 2.7 ) Pub Date : 2021-02-07 , DOI: 10.1002/ecs2.3360
Ariana M Chiapella 1, 2 , Martin J Kainz 3, 4 , Angela L Strecker 1, 5, 6
Affiliation  

Tracing the flow of dietary energy sources, especially in systems with a high degree of omnivory, is an ongoing challenge in ecology. In aquatic systems, one of the persistent challenges is in differentiating between autochthonous and allochthonous energy sources to top consumers. Bulk carbon stable isotope values of aquatic and terrestrial prey often overlap, making it difficult to delineate dietary energy pathways in food webs with high allochthonous prey subsidies, such as in many northern temperate waterbodies. We conducted a feeding experiment to explore how fatty acid stable isotopes may overcome the challenge of partitioning autochthonous and allochthonous energy pathways in aquatic consumers. We fed hatchery‐reared Arctic Char (Salvelinus alpinus) diets of either benthic invertebrates, terrestrial earthworms, or a mixture of both. We then compared how the stable carbon isotopes of fatty acids (δ13CFA) distinguished between diet items and respective treatments in S. alpinus liver and muscle tissues, relative to bulk stable isotopes and fatty acid profiles. Although a high degree of variability of fatty acid stable carbon isotope values was present in all three measures, our results suggest that the ability of this method to overcome the challenges of bulk stable isotopes may be overstated. Finally, our study highlights the importance of further experimental investigation, and consideration of physiological and biochemical processes when employing this emerging method.

中文翻译:

脂肪酸稳定同位素为追踪水生食物网中的能量途径增加了清晰度,但也增加了复杂性

追踪膳食能量来源的流动,尤其是在高度杂食的系统中,是生态学中一个持续的挑战。在水生系统中,持续存在的挑战之一是区分本地和外来能源给顶级消费者。水生和陆生猎物的散装碳稳定同位素值经常重叠,这使得很难描绘具有高外来猎物补贴的食物网中的膳食能量途径,例如在许多北温带水体中。我们进行了一项喂养实验,以探索脂肪酸稳定同位素如何克服水生消费者中本地和异地能量途径划分的挑战。我们喂养孵化场饲养的北极红点鲑 ( Salvelinus alpinus) 底栖无脊椎动物、陆生蚯蚓或两者混合的饮食。然后,我们比较了脂肪酸的稳定碳同位素 (δ 13 C FA ) 如何区分高山雪貂肝脏和肌肉组织中的饮食项目和各自的治疗,相对于整体稳定同位素和脂肪酸谱。尽管脂肪酸稳定碳同位素值在所有三个测量中都存在高度可变性,但我们的结果表明,这种方法克服本体稳定同位素挑战的能力可能被夸大了。最后,我们的研究强调了进一步实验研究的重要性,以及在采用这种新兴方法时考虑生理和生化过程的重要性。
更新日期:2021-02-08
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