ダウンロード数: 29
このアイテムのファイル:
ファイル | 記述 | サイズ | フォーマット | |
---|---|---|---|---|
gbi.12569.pdf | 1.37 MB | Adobe PDF | 見る/開く |
タイトル: | Major contribution of sulfide‐derived sulfur to the benthic food web in a large freshwater lake |
著者: | Onishi, Yuji Yamanaka, Toshiro Koba, Keisuke https://orcid.org/0000-0003-1942-9811 (unconfirmed) |
著者名の別形: | 大西, 雄二 木庭, 啓介 |
キーワード: | chemosynthesis Lake Biwa microbial sulfate reduction organic matter decomposition stable isotopes |
発行日: | Sep-2023 |
出版者: | Wiley |
誌名: | Geobiology |
巻: | 21 |
号: | 5 |
開始ページ: | 671 |
終了ページ: | 685 |
抄録: | 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. |
著作権等: | © 2023 The Authors. Geobiology published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
URI: | http://hdl.handle.net/2433/285247 |
DOI(出版社版): | 10.1111/gbi.12569 |
PubMed ID: | 37434444 |
出現コレクション: | 学術雑誌掲載論文等 |
このアイテムは次のライセンスが設定されています: クリエイティブ・コモンズ・ライセンス