Investigating the Paleoecological Consequences of Supercontinent Breakup: Sponges Clean Up in the Early Jurassic
Investigating the Paleoecological Consequences of Supercontinent Breakup: Sponges Clean Up in the Early Jurassic
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调查超大陆分裂的古生态后果：侏罗纪早期的海绵清理
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
D. Wilmeth
中科院分区：
文献类型：
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作者：
F. Corsetti;K. Ritterbush;D. Bottjer;S. Greene;Y. Ibarra;J. Yager;A. West;W. Berelson;S. Rosas;T. Becker;N. Levine;S. Loyd;R. Martindale;V. Petryshyn;Nathan R. Carroll;E. Petsios;C. Pietsch;J. Stellmann;J. Thompson;K. Washington;D. Wilmeth
今天，化石燃料碳不断释放到大气中，这意味着必须了解地球系统对二氧化碳上升的响应，而地质记录为研究这种行为提供了独特的机会。气孔和古土壤替代物表明，伴随着中大西洋岩浆省(CAMP)的喷发和侵位以及盘古大陆的分裂，三叠纪-侏罗纪(T-J)过渡时期大气PCO2发生了较大的变化。作为“五大”大灭绝之一--当时所谓的现代动物受到特别严重的打击--我们知道生物圈在这段时间受到了严重影响，但对细节了解相对较少，特别是从地球系统的角度来看。作为NSF地球生命过渡计划的一部分，我们的团队针对T-J进行了综合调查，以探索在大灭绝后可能存在的替代生态状态。初步的发现揭示了在持续了近200万年的物种灭绝之后，侏罗纪早期发生了一次全球性的“海绵接管”。海绵的接管可能与一系列不同寻常的因素有关，包括潜在的海洋酸化和营地进驻后强烈的硅酸盐风化。
The continued release of fossil fuel carbon into the atmosphere today means it is imperative to understand Earth system response to CO 2 rise, and the geologic record offers unique opportunities to investigate such behavior. Stomatal and paleosol proxies demonstrate a large change in atmospheric pCO 2 across the Triassic-Jurassic (T-J) transition, concomitant with the eruption and emplacement of the Central Atlantic Magmatic Province (CAMP) and the splitting of Pangea. As one of the “big 5” mass extinctions—when the so-called modern fauna was particularly hard hit—we know the biosphere was severely affected during this time, but the details are relatively poorly understood, particularly with respect to an Earth system perspective. As part of the NSF Earth Life Transitions initiative, our team has targeted the T-J for integrative investigation to explore, among other things, alternative ecological states that may exist in the aftermath of mass extinctions. The initial findings reveal a global “sponge takeover” in the Early Jurassic following the extinction that lasted nearly 2 million years. The sponge takeover may be linked to an unusual confluence of factors, including potential ocean acidification and intense silicate weathering following the emplacement of CAMP.