Metacommunity analyses show an increase in ecological specialisation throughout the Ediacaran period.
Metacommunity analyses show an increase in ecological specialisation throughout the Ediacaran period.
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DOI：
10.1371/journal.pbio.3001289
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发表时间：
2022-05
期刊：
影响因子：
9.8
通讯作者：
中科院分区：
文献类型：
--
作者：
第一批动物出现于埃迪卡拉纪晚期（572 至 541 Ma）；最初的多样性增加之后是多样性的减少，这通常被解释为灾难性的大规模灭绝。我们使用“元群落结构要素”框架来调查埃迪卡拉生态系统结构的变化，以评估纳马的多样性减少是否可能是由外部大规模灭绝或内部元群落重组引起的。最古老的元群落的特点是类群具有广泛的环境耐受性，但专业化或类群间关联有限。第二古老的元群落的结构增加，类群群体对环境梯度共享同步反应，聚集成不同的群落。这种模式在最年轻的元社区中得到加强，社区表现出强烈的环境隔离和深度结构。因此，元群落结构的复杂性增加，专业化程度提高，导致竞争排斥，而不是灾难性的环境灾难，导致埃迪卡拉纪末期的多样性丧失。这些结果表明，与寒武纪多样化相关的复杂生态进化动力学是在埃迪卡拉纪建立的。这项研究表明，寒武纪时期已知的后生动物多样化的生态进化动态始于埃迪卡拉纪早期的阿瓦隆组合，并随着新的解剖学创新的出现而在显生宙变得更加复杂，最终导致“寒武纪大爆发”。
The first animals appear during the late Ediacaran (572 to 541 Ma); an initial diversity increase was followed reduction in diversity, often interpreted as catastrophic mass extinction. We investigate Ediacaran ecosystem structure changes over this time period using the “Elements of Metacommunity Structure” framework to assess whether this diversity reduction in the Nama was likely caused by an external mass extinction, or internal metacommunity restructuring. The oldest metacommunity was characterised by taxa with wide environmental tolerances, and limited specialisation or intertaxa associations. Structuring increased in the second oldest metacommunity, with groups of taxa sharing synchronous responses to environmental gradients, aggregating into distinct communities. This pattern strengthened in the youngest metacommunity, with communities showing strong environmental segregation and depth structure. Thus, metacommunity structure increased in complexity, with increased specialisation and resulting in competitive exclusion, not a catastrophic environmental disaster, leading to diversity loss in the terminal Ediacaran. These results reveal that the complex eco-evolutionary dynamics associated with Cambrian diversification were established in the Ediacaran. This study shows that the eco-evolutionary dynamics of metazoan diversification known from the Cambrian Period started earlier in the Ediacaran Period with the Avalon assemblage and increased in complexity towards the Phanerozoic as new anatomical innovations appeared, culminating in the “Cambrian Explosion."
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影响因子：
3.9
作者：
Collins, Michael D.;Simberloff, Daniel;Connor, Edward F.
通讯作者：
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DOI：
10.1098/rspb.2015.0927
发表时间：
2015-08-22
影响因子：
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作者：
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DOI：
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发表时间：
2011-01-01
期刊：
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影响因子：
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作者：
Bush, Andrew M.;Bambach, Richard K.;Erwin, Douglas H.
通讯作者：
Erwin, Douglas H.
影响因子：
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作者：
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