Bioturbation Shapes Marine Biogeochemical Cycling Following the End-Permian Mass Extinction in Northern Pangea

IF 3.4 2区 地球科学 Q2 BIOLOGY
Geobiology Pub Date : 2025-09-19 DOI:10.1111/gbi.70032
Brian Beaty, William J. Foster, Valentin Zuchuat, Spencer R. Moller, Stella Z. Buchwald, Hannah Brooks, Sofia Rauzi, Terry Isson, Sverre Planke, Francisco J. Rodríguez-Tovar, Kim Senger, Noah Planavsky, Lidya Tarhan
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Abstract

During the end-Permian mass extinction, a global decline in seafloor sediment mixing and burrowing (bioturbation) provides critical evidence for the collapse of marine ecosystems, likely triggered by rapid ocean warming and deoxygenation. However, the decline and subsequent recovery of bioturbation after the extinction event may not only have been a symptom of environmental change but also a driver, influencing nutrient exchange and reductant burial across the sediment–water interface and thus water column oxygen availability and seafloor habitability more broadly. Here we test this hypothesis through combined analyses of bioturbation and sedimentary geochemistry, focusing on marine siliciclastic records of the Permian–Triassic transition from Svalbard. We find that total organic carbon, total sulfur, and organic phosphorus decrease with increasing bioturbation intensity, whereas inorganic reactive phosphorus phases (authigenic and iron oxide-bound phosphorus) increase. These differences are most strongly associated with biodiffusion (particle mixing) rather than bioirrigation (solute exchange). Our findings suggest that bioturbation primarily influenced sediment chemistry by enhancing organic matter oxidation, in contrast to some modern settings where downward mixing may promote organic matter preservation within the anoxic portion of seafloor sediments. The early return of shallow-tier bioturbators in this region < 200 kyr after the extinction event likely promoted a rapid restoration of efficient carbon and sulfur cycling within benthic ecosystems. In contrast, efficient phosphorus burial via sink-switching may not have resumed until deeper-tier bioturbators achieved pre-extinction levels of sediment mixing > 1 Myr after the mass extinction.

生物扰动塑造了盘古大陆北部二叠纪末大灭绝后的海洋生物地球化学循环。
在二叠纪末大灭绝期间,海底沉积物混合和挖洞(生物扰动)的全球减少为海洋生态系统的崩溃提供了重要证据,这可能是由海洋快速变暖和脱氧引发的。然而,灭绝事件后生物扰动的减少和随后的恢复可能不仅是环境变化的一个症状,也是一个驱动因素,影响沉积物-水界面上的营养交换和还原剂埋藏,从而更广泛地影响水柱氧可用性和海底可居住性。在这里,我们通过生物扰动和沉积地球化学的综合分析来验证这一假设,重点是斯瓦尔巴群岛二叠纪-三叠纪过渡的海洋硅屑记录。我们发现总有机碳、总硫和有机磷随着生物扰动强度的增加而减少,而无机活性磷相(自生磷和氧化铁结合磷)增加。这些差异与生物扩散(颗粒混合)而非生物灌溉(溶质交换)密切相关。我们的研究结果表明,生物扰动主要通过增强有机物氧化来影响沉积物的化学性质,而在一些现代环境中,向下混合可能促进海底沉积物缺氧部分的有机物保存。该地区浅层生物扰流器早在大灭绝后1万年返回。
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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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