Allometric conservatism in the evolution of bird beaks.

Allometric conservatism in the evolution of bird beaks.
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DOI:
10.1002/evl3.267
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发表时间:
2022-03
期刊:
影响因子:
5
通讯作者:
Thomas GH
Thomas GH
中科院分区:
生物学1区
文献类型:
--
作者:
Rombaut LMK;Capp EJR;Cooney CR;Hughes EC;Varley ZK;Thomas GH

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进化可能涉及在多样性范围内快速分化适应和扩张的时期,但由于功能,遗传发育和生态限制,进化在一定的时间尺度上也可能相对保守。进化可能是保守的一种方式是异速生长,即生物体特征和身体大小之间的比例关系。在这里,我们调查模式的异速生长保守性的进化鸟喙喙的大小和身体大小的数据,为一个有代表性的样本超过5000现存的鸟类物种的系统发育框架。我们确定的分支,其中喙的大小和身体大小之间的异速生长关系一直保持相对保守的物种在数百万至数千万年。我们发现,异速生长的保守性,但偶尔的斜率和异速生长关系的截距的变化打断。随着时间的推移,这种变化的稳定积累导致了今天鸟类喙大小相对于身体大小的巨大差异。我们的研究结果与戴维森的宏观进化观是一致的,进化保守主义是规则,但偶尔会转移到新的适应区。
Evolution can involve periods of rapid divergent adaptation and expansion in the range of diversity, but evolution can also be relatively conservative over certain timescales due to functional, genetic‐developmental, and ecological constraints. One way in which evolution may be conservative is in terms of allometry, the scaling relationship between the traits of organisms and body size. Here, we investigate patterns of allometric conservatism in the evolution of bird beaks with beak size and body size data for a representative sample of over 5000 extant bird species within a phylogenetic framework. We identify clades in which the allometric relationship between beak size and body size has remained relatively conserved across species over millions to tens of millions of years. We find that allometric conservatism is nonetheless punctuated by occasional shifts in the slopes and intercepts of allometric relationships. A steady accumulation of such shifts through time has given rise to the tremendous diversity of beak size relative to body size across birds today. Our findings are consistent with the Simpsonian vision of macroevolution, with evolutionary conservatism being the rule but with occasional shifts to new adaptive zones.
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