持久形态多态性的分类将古生物模式与种群过程联系起来

IF 2.6 2区 地球科学 Q2 BIODIVERSITY CONSERVATION
Paleobiology Pub Date : 2023-10-10 DOI:10.1017/pab.2023.27
Charles Tomomi Parins-Fukuchi
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引用次数: 0

摘要

生物变异促进了进化变化。然而,在更长的时间尺度上,基因组和表型水平上的多态性通常比在标准群体遗传模型(如正选择或遗传漂变)下预期的持续时间更长。通过平衡选择来解释这种变异在种群内长时间的维持是理论种群遗传学和生态学的重大胜利。尽管通过岩石记录,可以在化石谱系中追踪到长时间的持续多态性,但古生物学对表型变异的长期维持或其宏观进化后果几乎没有什么说法。我探索了在物种形成时发生的人口剧变期间,当在长谱系持续时间内保持的持久多态性被过滤到后代谱系时发生的动态。我在两个谱系中评估了这些模式:Ectocion,始新世哺乳动物的一个属,和botryocrinids,一个密西西比有齿的海鲷科。根据起源,后代比他们的祖先变化更少。分类祖先变异的模式不能与漂移区分开。在高度可变的祖先谱系(如Barycrinus rhombiferus Owen和Shumard, 1852)中维持和积累的多态性可能会促进辐射,因为性状状态被划分为多个后代谱系。探究跨特异性多态性在人口和生态剧变时期保持或丢失的条件,可以解释种群水平的过程如何促进新兴的宏观进化动力学,这些宏观进化动力学塑造了化石记录中保存的生命史。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sorting of persistent morphological polymorphisms links paleobiological pattern to population process
Abstract Biological variation fuels evolutionary change. Across longer timescales, however, polymorphisms at both the genomic and phenotypic levels often persist longer than would be expected under standard population genetic models such as positive selection or genetic drift. Explaining the maintenance of this variation within populations across long time spans via balancing selection has been a major triumph of theoretical population genetics and ecology. Although persistent polymorphisms can often be traced in fossil lineages over long periods through the rock record, paleobiology has had little to say about either the long-term maintenance of phenotypic variation or its macroevolutionary consequences. I explore the dynamics that occur when persistent polymorphisms maintained over long lineage durations are filtered into descendant lineages during periods of demographic upheaval that occur at speciation. I evaluate these patterns in two lineages: Ectocion , a genus of Eocene mammals, and botryocrinids, a Mississippian cladid crinoid family. Following origination, descendants are less variable than their ancestors. The patterns by which ancestral variation is sorted cannot be distinguished from drift. Maintained and accumulated polymorphisms in highly variable ancestral lineages such as Barycrinus rhombiferus Owen and Shumard, 1852 may fuel radiations as character states are sorted into multiple descendant lineages. Interrogating the conditions under which trans-specific polymorphism is either maintained or lost during periods of demographic and ecological upheaval can explain how population-level processes contribute to the emergent macroevolutionary dynamics that shape the history of life as preserved in the fossil record.
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来源期刊
Paleobiology
Paleobiology 地学-古生物学
CiteScore
5.30
自引率
3.70%
发文量
38
审稿时长
>12 weeks
期刊介绍: Paleobiology publishes original contributions of any length (but normally 10-50 manuscript pages) dealing with any aspect of biological paleontology. Emphasis is placed on biological or paleobiological processes and patterns, including macroevolution, extinction, diversification, speciation, functional morphology, bio-geography, phylogeny, paleoecology, molecular paleontology, taphonomy, natural selection and patterns of variation, abundance, and distribution in space and time, among others. Taxonomic papers are welcome if they have significant and broad applications. Papers concerning research on recent organisms and systems are appropriate if they are of particular interest to paleontologists. Papers should typically interest readers from more than one specialty. Proposals for symposium volumes should be discussed in advance with the editors.
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