循规蹈矩：在化石啮齿动物萨维尼拟鼠中，60万年的臼齿进化受异速生长约束。
Walk the line: 600000 years of molar evolution constrained by allometry in the fossil rodent Mimomys savini.
作者信息
Firmat Cyril, Lozano-Fernández Iván, Agustí Jordi, Bolstad Geir H, Cuenca-Bescós Gloria, Hansen Thomas F, Pélabon Christophe
机构信息
Department of Biology, Centre for Biodiversity Dynamics, Norwegian University of Science and Technology, 7419 Trondheim, Norway
IPHES, Institut Català de Paleoecologia Humana i Evolució Social, C/Escorxador s/n, Tarragona 3003, Spain Area de Prehistoria, Universitat Rovira i Virgili (URV), Avinguda de Catalunya 35, Tarragona 43002, Spain.
出版信息
Philos Trans R Soc Lond B Biol Sci. 2014 Aug 19;369(1649):20140057. doi: 10.1098/rstb.2014.0057.
The allometric-constraint hypothesis states that evolutionary divergence of morphological traits is restricted by integrated growth regulation. In this study, we test this hypothesis on a time-calibrated and well-documented palaeontological sequence of dental measurements on the Pleistocene arvicoline rodent species Mimomys savini from the Iberian Peninsula. Based on 507 specimens representing nine populations regularly spaced over 600 000 years, we compare static (within-population) and evolutionary (among-population) allometric slopes between the width and the length of the first lower molar. We find that the static allometric slope remains evolutionary stable and predicts the evolutionary allometry quite well. These results support the hypothesis that the macroevolutionary divergence of molar traits is constrained by static allometric relationships.
异速生长约束假说认为，形态特征的进化分歧受到整体生长调节的限制。在本研究中，我们基于伊比利亚半岛更新世田鼠亚科啮齿动物萨维尼拟鼠（Mimomys savini）经过时间校准且记录完备的古生物学牙齿测量序列来检验这一假说。我们以代表九个种群、在60万年中均匀分布的507个标本为基础，比较了第一下臼齿宽度与长度之间的静态（种群内）和进化（种群间）异速生长斜率。我们发现静态异速生长斜率在进化上保持稳定，并且能很好地预测进化异速生长。这些结果支持了磨牙特征的宏观进化分歧受静态异速生长关系限制这一假说。
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