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Paleozoic ammonoid ecomorphometrics test ecospace availability as a driver of morphological diversification.
Science Advances ( IF 13.6 ) Pub Date : 2020-09-09 , DOI: 10.1126/sciadv.abc2365
Christopher D Whalen 1 , Pincelli M Hull 1, 2 , Derek E G Briggs 1, 2
Affiliation  

The early burst model suggests that disparity rises rapidly to fill empty ecospace following clade origination or in the aftermath of a mass extinction. Early bursts are considered common features of fossil data, but neontological studies have struggled to identify them. Furthermore, tests have proven difficult because factors besides ecology can drive changes in morphology. Here, we document the ecomorphometric evolution of the extinct Ammonoidea at 1-million-year resolution, from their origination in the Early Devonian (Emsian) to the Early Triassic (Induan), over ~156 million years. This time interval encompasses six global extinction events, including two of the Big Five, and incorporates multiple ammonoid radiations. However, we find no evidence for early bursts of ecomorphological disparity. This contradicts arguments that the temporal scope, or traits measured in genomic data, conceal evidence of early bursts. Rather, early bursts may be less prevalent in fossil data than is often assumed.



中文翻译:

古生代菊石生态形态计量学测试生态空间可用性作为形态多样化的驱动因素。

早期爆发模型表明,在进化枝起源或大规模灭绝之后,差异迅速上升以填补空白的生态空间。早期爆发被认为是化石数据的共同特征,但新生儿学研究一直在努力识别它们。此外,测试已被证明是困难的,因为生态以外的因素可以推动形态的变化。在这里,我们以 100 万年的分辨率记录了已灭绝的 Ammonoidea 的生态形态学演化,从它们起源于早泥盆纪(Emsian)到早三叠世(Induan),大约 1.56 亿年。这个时间间隔包括六次全球灭绝事件,包括五巨头中的两次,并包含多种菊石辐射。然而,我们没有发现早期爆发生态形态差异的证据。这与时间范围的论点相矛盾,或在基因组数据中测量的特征,隐藏了早期爆发的证据。相反,早期爆发在化石数据中的普遍性可能不如通常假设的那么普遍。

更新日期:2020-09-10
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