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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Late Cretaceous restructuring of terrestrial communities facilitated the end-Cretaceous mass extinction in North America
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Late Cretaceous restructuring of terrestrial communities facilitated the end-Cretaceous mass extinction in North America

机译：晚白垩世对陆地群落的重组促进了北美白垩纪末期大灭绝

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摘要

The sudden environmental catastrophe in the wake of the end-Cretaceous asteroid impact had drastic effects that rippled through animal communities. To explore how these effects may have been exacerbated by prior ecological changes, we used a food-web model to simulate the effects of primary productivity disruptions, such as those predicted to result from an asteroid impact, on ten Campanian and seven Maastrichtian terrestrial localities in North America. Our analysis documents that a shift in trophic structure between Campanian and Maastrichtian communities in North America led Maastrichtian communities to experience more secondary extinction at lower levels of primary production shutdown and possess a lower collapse threshold than Campanian communities. Of particular note is the fact that changes in dinosaur richness had a negative impact on the robustness of Maastrichtian ecosystems against environmental perturbations. Therefore, earlier ecological restructuring may have exacerbated the impact and severity of the end-Cretaceous extinction, at least in North America.
机译：白垩纪末小行星撞击后突然发生的环境灾难造成了剧烈的影响，并在动物群落中蔓延。为了探索先前的生态变化可能如何加剧这些影响，我们使用了食物网模型来模拟主要生产力中断（例如预计因小行星撞击而造成的影响）对喀麦隆的10个坎帕尼和7个马斯特里赫特陆生地区的影响。北美。我们的分析表明，北美Campanian社区与Maastrichtian社区之间的营养结构发生了变化，导致Maastrichtian社区在初级生产关闭水平较低的情况下经历了更多的二次灭绝，并且崩溃门槛低于Campanian社区。特别值得注意的是，恐龙丰富度的变化对马斯特里赫特生态系统抵御环境扰动的稳定性产生了负面影响。因此，至少在北美，较早的生态结构调整可能加剧了白垩纪末期灭绝的影响和严重性。

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