摇蚊调节长链多不饱和脂肪酸的含量,不受湖泊营养物质或溶解有机碳浓度的影响

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY
Oikos Pub Date : 2024-08-27 DOI:10.1111/oik.10816
Matthias Pilecky, Aatu Turunen, Mohammad S. Sohrabi, Sadikshya Ghimire, Timo Ilo, Petri Kesti, Simon Vitecek, Lena Fehlinger, Jarkko Akkanen, Sami J. Taipale, Anssi Vainikka, Kimmo K. Kahilainen, Martin J. Kainz, Ursula Strandberg
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引用次数: 0

摘要

摇蚊是具有半水生生命周期的关键性初级底栖消费者。它们通过输送食物营养物质(如脂肪酸)来支持更高营养级的水生和陆生消费者。在这项研究中,我们结合实地取样和实验室实验,考察了环境参数(包括食物)对摇蚊幼虫和想象体脂肪酸组成和新陈代谢的影响。53个湖泊的研究结果表明,湖泊大小、深度、溶解有机碳(DOC)浓度和营养状态对摇蚊体内长链多不饱和脂肪酸(LC-PUFA)含量的影响微乎其微。特定化合物的稳定氢同位素分析证实,在所有湖泊类型中,摇蚊都能积极地将食物中的脂肪酸前体生物转化为LC-PUFA,这与营养物质或DOC浓度无关。此外,脂肪酸特异性稳定碳同位素数据表明,摇蚊的食物得到了陆地 C18 脂肪酸前体转化为 LC-PUFA 的补充,尤其是在春季的低营养湖泊中。摄食实验数据进一步证实,膳食中低聚磷酸的减少会促进膳食中短链脂肪酸前体向低聚磷酸的转化。这些结果表明,摇蚊是一种 PUFA 调节器,可以在不同的环境条件下维持 LC-PUFA 的水平。此外,我们的研究结果表明,摇蚊能将陆地上的低质量物质生物转化为高质量资源,并通过摇蚊的出现支持陆地食物网。摇蚊数量众多,分布广泛,因此,低碳-PUFA的营养转移对水生和陆生生态系统中上层营养级消费者的适应性和生产具有重要影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Chironomids regulate long‐chain polyunsaturated fatty acid levels independent of lake nutrient or dissolved organic carbon concentrations
Chironomids are keystone primary benthic consumers with semi‐aquatic life cycles. They support aquatic and terrestrial consumers at higher trophic levels by conveying dietary nutrients, such as fatty acids. In this study, we combined field sampling and laboratory experiments to examine the effects of environmental parameters, including diet, on fatty acid composition and metabolism in chironomid larvae and imagines. Results from 53 lakes showed that lake size, depth, dissolved organic carbon (DOC) concentrations, and trophic state had only marginal effects on the content of long‐chain polyunsaturated fatty acids (LC‐PUFA) in chironomids. Compound‐specific stable hydrogen isotope analyses confirmed that chironomids actively bioconvert dietary fatty acid precursors to LC‐PUFA in all lake types, independent of nutrient or DOC concentrations. Moreover, fatty acid‐specific stable carbon isotope data indicated that the diet of chironomids was subsidized, particularly in oligotrophic lakes in spring, by terrestrial C18 fatty acid precursors that were converted to LC‐PUFA. Data from feeding experiments further confirmed that decreased dietary availability of LC‐PUFA enhanced the conversion of dietary short‐chain precursors to LC‐PUFA. These results suggest that chironomids are PUFA regulators that can sustain LC‐PUFA levels under varying environmental conditions. Furthermore, our results indicate that they bioconvert terrestrial low‐quality material to high‐quality resources, which, via chironomid emergence, support terrestrial food webs. Chironomids are abundant and widespread, and thus, the trophic transfer of LC‐PUFA can have significant implications for the fitness and production of upper trophic level consumers in both aquatic and terrestrial ecosystems.
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来源期刊
Oikos
Oikos 环境科学-生态学
CiteScore
6.20
自引率
5.90%
发文量
152
审稿时长
6-12 weeks
期刊介绍: Oikos publishes original and innovative research on all aspects of ecology, defined as organism-environment interactions at various spatiotemporal scales, so including macroecology and evolutionary ecology. Emphasis is on theoretical and empirical work aimed at generalization and synthesis across taxa, systems and ecological disciplines. Papers can contribute to new developments in ecology by reporting novel theory or critical empirical results, and "synthesis" can include developing new theory, tests of general hypotheses, or bringing together established or emerging areas of ecology. Confirming or extending the established literature, by for example showing results that are novel for a new taxon, or purely applied research, is given low priority.
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