Palaeolatitudinal distribution of the Ediacaran macrobiota
Palaeolatitudinal distribution of the Ediacaran macrobiota
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DOI：
10.1144/jgs2021-030
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发表时间：
2021-08-02
影响因子：
2.7
通讯作者：
Liu, Alexander G.
中科院分区：
文献类型：
--
作者：
Boddy, Catherine E.;Mitchell, Emily G.;Liu, Alexander G.
埃迪卡拉纪晚期的大型化石（c. 579-539 Ma）记录了多种多样的、复杂的多细胞真核生物，包括在寒武纪后生动物门辐射之前的早期动物。为了研究环境扰动，生物反应和早期后生动物进化轨迹之间的关系，区分埃迪卡拉纪宏体化石全球分布的进化和生态控制是至关重要的。时间，palaeoenvironmental和岩性因素在塑造埃迪卡拉纪宏化石遗址之间的组合分类组成观察到的变化的贡献进行了广泛的讨论，但古地理的作用仍然模糊不清。在这里，我们调查的影响，古纬度的埃迪卡拉纪大型生物群的空间分布通过埃迪卡拉纪晚期使用两个领先的古地理重建。我们发现，总体属的多样性分布在所有palaeolatitudes。在特定的群体中，候选人的分布“双边”和Frondomorph类群表现出弱的统计学显着性和统计学显着差异低和高palaeolatitudes在我们青睐的古地理重建，分别，而藻类，管状，软体和生物矿化类群没有显着差异。在统计上显着的古纬度差异的某些形态群的分布的认识，突出了考虑古纬度的影响时，询问埃迪卡拉纪类群分布的趋势的重要性。
Macrofossils of the late Ediacaran Period (c. 579-539 Ma) document diverse, complex multicellular eukaryotes, including early animals, prior to the Cambrian radiation of metazoan phyla. To investigate the relationships between environmental perturbations, biotic responses and early metazoan evolutionary trajectories, it is vital to distinguish between evolutionary and ecological controls on the global distribution of Ediacaran macrofossils. The contributions of temporal, palaeoenvironmental and lithological factors in shaping the observed variations in assemblage taxonomic composition between Ediacaran macrofossil sites are widely discussed, but the role of palaeogeography remains ambiguous. Here we investigate the influence of palaeolatitude on the spatial distribution of Ediacaran macrobiota through the late Ediacaran Period using two leading palaeogeographical reconstructions. We find that overall generic diversity was distributed across all palaeolatitudes. Among specific groups, the distributions of candidate 'Bilateral' and Frondomorph taxa exhibit weakly statistically significant and statistically significant differences between low and high palaeolatitudes within our favoured palaeogeographical reconstruction, respectively, whereas Algal, Tubular, Soft-bodied and Biomineralizing taxa show no significant difference. The recognition of statistically significant palaeolatitudinal differences in the distribution of certain morphogroups highlights the importance of considering palaeolatitudinal influences when interrogating trends in Ediacaran taxon distributions.