Environmental controls on Jurassic marine ecosystems during global warming
Environmental controls on Jurassic marine ecosystems during global warming
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DOI：
10.1130/g36390.1
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发表时间：
2015-03-01
期刊：
影响因子：
5.8
通讯作者：
Little, Crispin T. S.
中科院分区：
文献类型：
--
作者：
Danise, Silvia;Twitchett, Richard J.;Little, Crispin T. S.
如果古生物学数据与适当的环境变化指标相结合，化石记录有可能为物种对过去气候变化的反应提供有价值的见解。在这里，我们使用一种新的、多变量的方法，将一套地球化学指标与高分辨率的定量大型无脊椎动物化石数据相结合，来研究对托尔西早期(约183 Ma)变暖的响应。我们发现，在变暖过程中，底栖生态系统和底栖生态系统变得解耦，并受到不同环境变量的驱动。底栖动物的更替主要是由海水溶解氧浓度的变化驱动的，而营养体头足类之间的更替主要受风化、营养物质径流和初级生产力的变化控制。尽管快速变暖被认为是这一事件的主要触发因素，但古温度替代指标不能很好地预测海洋群落动态，与温度间接相关的非生物因素更重要。鉴于类似的环境变化是全球变暖的其他事件的特点，并正在影响当今的海洋群落，我们预测，在过去的其他事件中也发生了类似的生态反应，这可能是当前变化的结果。
The fossil record has the potential to provide valuable insights into species response to past climate change if paleontological data are combined with appropriate proxies of environmental change. Here we use a novel, multivariate approach that combines a suite of geochemical proxies with high-resolution quantitative macroinvertebrate fossil data to study responses to early Toarcian warming (ca. 183 Ma). We show that benthic and nektonic ecosystems became decoupled during warming and were driven by different environmental variables. Benthic turnover was mostly driven by variations in seawater dissolved oxygen concentration, whereas turnover among the nektonic cephalopods was primarily controlled by variations in weathering, nutrient runoff, and primary productivity. Although rapid warming has been invoked as the main trigger of this event, the paleotemperature proxy was a poor predictor of marine community dynamics, and abiotic factors indirectly linked to temperature were more important. Given that similar environmental changes characterize other episodes of global warming and are impacting present-day marine communities, we predict that similar ecological responses occurred during other past events and are a probable outcome of current changes.