The impact of anoxia on pelagic macrofauna during the Toarcian Oceanic Anoxic Event (Early Jurassic)
The impact of anoxia on pelagic macrofauna during the Toarcian Oceanic Anoxic Event (Early Jurassic)
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DOI：
10.1016/j.pgeola.2014.06.001
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发表时间：
2014-09-01
影响因子：
1.2
通讯作者：
Coe, Angela L.
中科院分区：
文献类型：
--
作者：
Caswell, Bryony A.;Coe, Angela L.
托尔西亚海洋缺氧事件期间的极端环境变化对海洋生物群产生了广泛的影响。这项来自英国约克郡海岸的研究提供了新的证据，表明这一事件与鱼类和菊石死亡率上升时期有关。综合远洋大型动物的变化、底栖动物资料和地球化学指标，我们发现：(1)远洋大型动物的范围和丰度，(2)底栖大型动物的丰度，和(3)指示去氧的地球化学指标之间存在着地层相关性。我们确定了8个不同性质的地层段。结果提示有两个主要阶段的相对持续的脱氧与光带Euxinia。旋回地层学时间标尺表明，每个阶段至少持续了数万年。贝伦尼石在这次事件中的迁移可能是由于海水温度升高和食物供应不足造成的，与今天海洋中观察到的包括鱿鱼在内的许多海洋类群类似。(C)2014年地质学家协会。爱思唯尔有限公司出版。保留所有权利。
Extreme environmental change during the Toarcian Oceanic Anoxic Event had widespread impacts on marine biota. This study provides new evidence, from the Yorkshire coast sections, UK, that the event was associated with periods of elevated fish and ammonite mortality. Using a synthesis of pelagic macrofaunal changes, benthic macrofaunal data and geochemical proxies we show that there are stratigraphical correlations between: (1) pelagic macrofaunal ranges and abundance, (2) benthic macrofaunal abundance, and (3) geochemical proxies that indicate deoxygenation. We identify eight stratigraphical intervals of differing character. Results suggest two major phases of relatively persistent deoxygenation with photic zone euxinia. The cyclostratigraphic timescale indicates that each phase lasted at least tens of thousands of years. Belemnite migration during the event probably resulted from increased seawater temperatures and low food supply similar to that observed for many marine taxa, including squid, within the present-day oceans. (C) 2014 The Geologists' Association. Published by Elsevier Ltd. All rights reserved.