Macroevolutionary dynamics of dentition in Mesozoic birds reveal no long-term selection towards tooth loss.
Macroevolutionary dynamics of dentition in Mesozoic birds reveal no long-term selection towards tooth loss.
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DOI：
10.1016/j.isci.2021.102243
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发表时间：
2021-03-19
期刊：
影响因子：
5.8
通讯作者：
Field DJ
中科院分区：
文献类型：
--
作者：
Brocklehurst N;Field DJ
已经提出了几个可能导致鸟类牙齿缺失的因素，尽管共识仍然难以达成，因为完全没有牙齿的下巴在中生代鸟类和更广泛的恐龙中独立出现了无数次。冠鸟无牙的起源已经从大范围的选择性压力或无牙的趋势的角度进行了讨论，尽管这从未被定量测试。在这里，我们没有发现任何证据表明，在中生代Avialae中反复获得无牙是由总体的选择趋势驱动的。相反，我们的结果支持不同牙齿缺失模式下颌骨区域之间的模块化，并表明与之前的假设(∼90mya)相比，向完全冠鸟无牙畸形的转变要晚得多。我们发现鸟类牙齿丧失的模式符合Dollo定律，并表明到目前为止，无牙鸟类的排他性生存表现为特定谱系的选择压力、牙齿丧失的不可逆性和白垩纪-古近纪(K-PG)大灭绝的过滤。中生代鸟类牙齿缺失的进化过程存在争议分析表明没有长期的选择压力或无牙的趋势牙齿丢失可能是个体谱系局部选择压力的结果向冠鸟无牙的转变发生得比先前假设的古生物学、生物科学、进化生物学、系统遗传学、系统发育和古生物学更晚
Several potential drivers of avian tooth loss have been proposed, although consensus remains elusive as fully toothless jaws arose independently numerous times among Mesozoic avialans and dinosaurs more broadly. The origin of crown bird edentulism has been discussed in terms of a broad-scale selective pressure or trend toward toothlessness, although this has never been quantitatively tested. Here, we find no evidence for models whereby iterative acquisitions of toothlessness among Mesozoic Avialae were driven by an overarching selective trend. Instead, our results support modularity among jaw regions underlying heterogeneous tooth loss patterns and indicate a substantially later transition to complete crown bird edentulism than previously hypothesized (∼90 mya). We show that patterns of avialan tooth loss adhere to Dollo's law and suggest that the exclusive survival of toothless birds to the present represents lineage-specific selective pressures, irreversibility of tooth loss, and the filter of the Cretaceous-Paleogene (K–Pg) mass extinction. The evolutionary processes underlying tooth loss in Mesozoic birds are debated Analyses reveal no long-term selective pressure or trend toward toothlessness Tooth loss was likely a result of local selective pressures on individual lineages The transition to crown bird toothlessness occurred later than previously hypothesized Paleontology; Biological Sciences; Evolutionary Biology; Phylogenetics; Phylogeny; Paleobiology
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影响因子：
64.8
作者：
Li, Chun;Wu, Xiao-Chun;Zhao, Li-Jun
通讯作者：
Zhao, Li-Jun
DOI：
10.1016/j.palaeo.2018.03.006
发表时间：
2019-01-01
影响因子：
3
作者：
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通讯作者：
O'Connor, Jingmai K.
影响因子：
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作者：
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Springer, Mark S.
影响因子：
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作者：
Close, Roger A.;Friedman, Matt;Benson, Roger B. J.
通讯作者：
Benson, Roger B. J.