The developing bird pelvis passes through ancestral dinosaurian conditions
The developing bird pelvis passes through ancestral dinosaurian conditions
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发育中的鸟类骨盆经历了恐龙祖先的条件
DOI：
10.1038/s41586-022-04982-w
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发表时间：
2022
期刊：
影响因子：
64.8
通讯作者：
Rowe, Timothy B.
中科院分区：
文献类型：
--
作者：
Griffin, Christopher T.;Botelho, João F.;Hanson, Michael;Fabbri, Matteo;Smith-Paredes, Daniel;Carney, Ryan M.;Norell, Mark A.;Egawa, Shiro;Gatesy, Stephen M.;Rowe, Timothy B.
现在的鸟类（鸟）的身体与祖先的爬行动物的身体有很大的不同。尤其是鸟类的骨盆，在从早期祖龙到现在的鸟类的过渡过程中经历了重大的变化。这种逐步的转变被一种优秀的化石记录很好地记录了下来，-；然而，其背后的个体发生变化却鲜为人知。我们使用胚胎学成像技术在三维上检查鸟类骨盆组织的形态发生，允许与化石记录进行直接比较。许多祖先恐龙的特征（例如，朝前的耻骨、短髂骨和耻骨“靴”）在鸟类的早期形态发生中是短暂存在的，然后通过产前发育序列过渡到典型的“鸟类”形态，这反映了特征获得的系统发育序列。我们定量地证明了鸟类骨盆的个体发育与非鸟类恐龙向鸟类的转变相似，并为骨盆内的表型协方差提供了证据，这种协方差在始祖恐龙中是保守的。鸟类胚胎中祖先状态的存在可能源于这种保守的协变关系。总之，我们的数据提供了证据，表明鸟类骨盆的早期发育很少被研究，它是通过末端附加机制进化的，即新的非胚性状态被添加到发育序列的末端，从而导致该序列中祖先特征状态的早期表达。我们检测到的表型整合提示了一种以前未被认识到的末端添加机制，并暗示在进化转变过程中，发育中祖先状态的保留是常见的。
Living birds (Aves) have bodies substantially modified from the ancestral reptilian condition. The avian pelvis in particular experienced major changes during the transition from early archosaurs to living birds,. This stepwise transformation is well documented by an excellent fossil record, –; however, the ontogenetic alterations that underly it are less well understood. We used embryological imaging techniques to examine the morphogenesis of avian pelvic tissues in three dimensions, allowing direct comparison with the fossil record. Many ancestral dinosaurian features (for example, a forward-facing pubis, short ilium and pubic ‘boot’) are transiently present in the early morphogenesis of birds and arrive at their typical ‘avian’ form after transitioning through a prenatal developmental sequence that mirrors the phylogenetic sequence of character acquisition. We demonstrate quantitatively that avian pelvic ontogeny parallels the non-avian dinosaur-to-bird transition and provide evidence for phenotypic covariance within the pelvis that is conserved across Archosauria. The presence of ancestral states in avian embryos may stem from this conserved covariant relationship. In sum, our data provide evidence that the avian pelvis, whose early development has been little studied, –, evolved through terminal addition—a mechanism, –whereby new apomorphic states are added to the end of a developmental sequence, resulting in expression,of ancestral character states earlier in that sequence. The phenotypic integration we detected suggests a previously unrecognized mechanism for terminal addition and hints that retention of ancestral states in development is common during evolutionary transitions.
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DOI：
10.1002/jez.548
发表时间：
2009-10
期刊：
Journal of experimental zoology. Part A, Ecological genetics and physiology
影响因子：
--
作者：
P. O’Connor
通讯作者：
P. O’Connor
DOI：
10.1098/rspb.2014.0765
发表时间：
2014-08-07
影响因子：
4.7
作者：
Francisco Botelho, Joao;Smith-Paredes, Daniel;Vargas, Alexander O.
通讯作者：
Vargas, Alexander O.
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影响因子：
3.7
作者：
Ada J. Klinkhamer;D. Ray Wilhite;Matt A. White;S. Wroe
通讯作者：
S. Wroe
美国国家博物馆中的肉食性恐龙骨骼学，特别是羚龙属（异特龙）和角鼻龙
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
C. W. Gilmore
通讯作者：
C. W. Gilmore
影响因子：
2
作者：
O. Rauhut;T. Hübner;K. Lanser
通讯作者：
O. Rauhut;T. Hübner;K. Lanser