Land-sea ecological connectivity during a Jurassic warming event
Land-sea ecological connectivity during a Jurassic warming event
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侏罗纪变暖事件期间的陆海生态连通性
DOI：
10.1016/j.epsl.2021.117290
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发表时间：
2022
影响因子：
5.3
通讯作者：
Danise S
中科院分区：
文献类型：
--
作者：
Danise S
关于气候变化如何在深层影响陆地-海洋生态连通性的知识很少。为了填补这一知识空白，我们通过侏罗纪(托尔西世早期)变暖事件汇编了一个独特的数据集，其中包括来自花粉和孢子、有机壁海洋浮游生物和底栖大型无脊椎动物的定量丰度数据，以及来自英国克利夫兰盆地同一采样层位的地球化学数据。利用这一数据集，我们：(I)重建陆地植物、海洋初级生产者和底栖动物的退化和恢复时间，以响应这一事件，以及(Ii)测试陆地和海洋生态系统变化之间的连通性。我们发现陆地-植物和海洋生态系统对这一事件的反应时间不一致。陆地植物最先受到最初变暖的影响，但在升温高峰后也相对较快地恢复到事件前的丰富度和多样性水平。浮游生物和底栖动物反而经历了对最初变暖的延迟反应，但随着变暖达到顶峰，它们遭受了快速和极端的更替。与植被相比，陆架海的恢复也延迟了(尤其是底栖动物)。生态连通性分析表明，陆地生态系统和海洋生态系统的变化之间有很强的联系。陆地上大树的丧失通过加强对浅海的侵蚀、径流和营养供应，促进了海洋浮游生物的变化，从甲藻到原生藻类为主的群落。富营养化和初级生产力的变化导致水柱和底层水中溶解氧的减少，进而影响底栖生物群落。在克利夫兰盆地观察到的这种因果机制很可能发生在北冰洋地区的其他盆地中，部分也发生在次北冰洋和特提斯地区的盆地中。尽管古纬度和古海洋梯度可能控制了早侏罗世陆地植物和海洋生态系统的局部和区域变化，但与全球快速变暖、风化作用增强和初级生产力高有关的主要气候和环境变化在所有研究领域都是共同的。
Knowledge on how climate change affects land-sea ecological connectivity in deep time is scarce. To fill this knowledge gap we have assembled a unique dataset through a Jurassic (early Toarcian) warming event that includes quantitative abundance data from pollen and spores, organic-walled marine plankton and benthic macro-invertebrates, in association with geochemical data derived from the same sampled horizons, from the Cleveland Basin, UK. Using this dataset we: (i) reconstruct the timing of degradation and recovery of land-plants, marine primary producers and benthic fauna in response to this event, and (ii) test for connectivity between changes in land and marine ecosystems. We find a discrepancy between the timing of the response of land-plant and marine ecosystems to the event. Land-plants were the first to be affected by initial warming, but also recovered relatively quickly after the peak of warmth to return to pre-event levels of richness and diversity. Plankton and benthic fauna instead experienced a delayed response to initial warming, but as warming peaked, they suffered a rapid and extreme turnover. Recovery in the shelf sea was also delayed (particularly for the benthos) compared to the vegetation. Ecological connectivity analyses show a strong link between changes in terrestrial and marine ecosystems. The loss of large trees on land contributed to changes in marine plankton, from dinoflagellate- to prasinophyte algal-dominated communities, by enhancing erosion, runoff and nutrient-supply into shallow seas. Eutrophication and changes in primary productivity contributed to the decrease of dissolved oxygen in the water column and in bottom waters, which in turn affected benthic communities. Such cause-effect mechanisms observed in the Cleveland Basin are likely to have occurred in other basins of the Boreal Realm, and in part also in basins of the Sub-Boreal and Tethyan realms. Although palaeolatitudinal and palaeoceanographic gradients may have controlled local and regional changes in land-plants and marine ecosystems during the Early Jurassic, the main climatic and environmental changes linked to rapid global warming, enhanced weathering and high primary productivity, are shared among all the examined realms.
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影响因子：
4.6
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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通讯作者：
Newton R
影响因子：
5.3
作者：
Vajda, Vivi;McLoughlin, Stephen;Nicoll, Robert S.
通讯作者：
Nicoll, Robert S.