硫化物衍生硫对大型淡水湖底栖生物食物网的主要贡献

IF 2.7 2区 地球科学 Q2 BIOLOGY
Geobiology Pub Date : 2023-07-11 DOI:10.1111/gbi.12569
Yuji Onishi, Toshiro Yamanaka, Keisuke Koba
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引用次数: 0

摘要

在淡水系统中,沉积物中硫氧化细菌的化学合成产物作为底栖生物食物网的营养资源的贡献尚不清楚,尽管化学合成产物可能是深海热液喷口和浅海系统中底栖生物食物网的重要营养资源。为了研究这一营养途径的地球化学方面,我们在日本最大的淡水(中营养型)湖泊琵浪湖的两个地点(90米和50米深)取样了沉积物岩心和底栖动物。通过测量沉积物和动物的稳定碳、氮和硫同位素,通过计算硫化物衍生硫对生物量的贡献以及支持硫营养资源的生物地球化学硫循环的贡献,精确地阐明了底栖生物食物网的硫营养资源。沉积物岩心在5 cm沉积物深度处34s贫硫化物含量增加,在较深层表现为低硫化物浓度和高δ34S,表明沉积物中微生物活动与硫酸盐还原和硫化物氧化有关。硫氧化细菌可能对底栖动物生物量有贡献。根据组成底栖生物食物网的每种动物的生物量、硫含量和对硫化物衍生硫的贡献计算,琵琶湖底栖生物食物网中总生物量硫的58%-67%被硫化物衍生硫占据。如此大的贡献意味着硫氧化细菌的化学合成产物是支持湖泊生态系统中底栖生物食物网的重要营养资源,至少在硫方面。结果表明,在低硫酸盐浓度的湖泊生态系统中,硫的营养途径一直被忽视。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Major contribution of sulfide-derived sulfur to the benthic food web in a large freshwater lake

In freshwater systems, contributions of chemosynthetic products by sulfur-oxidizing bacteria in sediments as nutritional resources in benthic food webs remain unclear, even though chemosynthetic products might be an important nutritional resource for benthic food webs in deep-sea hydrothermal vents and shallow marine systems. To study geochemical aspects of this trophic pathway, we sampled sediment cores and benthic animals at two sites (90 and 50 m water depths) in the largest freshwater (mesotrophic) lake in Japan: Lake Biwa. Stable carbon, nitrogen, and sulfur isotopes of the sediments and animals were measured to elucidate the sulfur nutritional resources for the benthic food web precisely by calculating the contributions of the incorporation of sulfide-derived sulfur to the biomass and of the biogeochemical sulfur cycle supporting the sulfur nutritional resource. The recovered sediment cores showed increases in 34S-depleted sulfide at 5 cm sediment depth and showed low sulfide concentration with high δ34S in deeper layers, suggesting an association of microbial activities with sulfate reduction and sulfide oxidation in the sediments. The sulfur-oxidizing bacteria may contribute to benthic animal biomass. Calculations based on the biomass, sulfur content, and contribution to sulfide-derived sulfur of each animal comprising the benthic food web revealed that 58%–67% of the total biomass sulfur in the benthic food web of Lake Biwa is occupied by sulfide-derived sulfur. Such a large contribution implies that the chemosynthetic products of sulfur-oxidizing bacteria are important nutritional resources supporting benthic food webs in the lake ecosystems, at least in terms of sulfur. The results present a new trophic pathway for sulfur that has been overlooked in lake ecosystems with low-sulfate concentrations.

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来源期刊
Geobiology
Geobiology 生物-地球科学综合
CiteScore
6.80
自引率
5.40%
发文量
56
审稿时长
3 months
期刊介绍: The field of geobiology explores the relationship between life and the Earth''s physical and chemical environment. Geobiology, launched in 2003, aims to provide a natural home for geobiological research, allowing the cross-fertilization of critical ideas, and promoting cooperation and advancement in this emerging field. We also aim to provide you with a forum for the rapid publication of your results in an international journal of high standing. We are particularly interested in papers crossing disciplines and containing both geological and biological elements, emphasizing the co-evolutionary interactions between life and its physical environment over geological time. Geobiology invites submission of high-quality articles in the following areas: Origins and evolution of life Co-evolution of the atmosphere, hydrosphere and biosphere The sedimentary rock record and geobiology of critical intervals Paleobiology and evolutionary ecology Biogeochemistry and global elemental cycles Microbe-mineral interactions Biomarkers Molecular ecology and phylogenetics.
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