Potential targets for selection during the evolution of viviparity in cold-climate reptiles
Potential targets for selection during the evolution of viviparity in cold-climate reptiles
复制标题
寒冷气候爬行动物胎生进化过程中的潜在选择目标
DOI：
10.1007/s00442-016-3752-9
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发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
Richard Shine
中科院分区：
文献类型：
--
作者：
Hong Li;Melanie Elphick;Richard Shine
在100多种有鳞爬行动物(蜥蜴和蛇)中，胎生(活产)是从产卵(产卵)进化而来的。这种转变通常发生在凉爽的气候中，在那里，(凉爽的)巢中的卵子和(温暖的)母体输卵管中的卵子之间的温度差异会影响胚胎的发育，这可能会增强后代的健康。为了确定可能被选择的特定特征，我们在模拟自然巢穴、母体体温和中间阶段(产卵前2周的子宫滞留)的条件下孵化了一种山地斑腿蜥蜴的卵。在整个孵化过程中，母体温度的孵化影响幼体蜥蜴的活动水平和胆量，以及它的发育速度、形态和运动能力。模拟胎盘发育初期的处理对幼体的某些性状(运动速度)有较大影响，对其他性状(尾长、总潜伏期)影响较小，对其他性状(后代行为)没有影响。更广泛地说，表型的不同方面对不同发育阶段的孵化条件是敏感的；因此，爬行动物胎生的进化可能是由胚胎发育不同阶段积累的一系列优势推动的。
Viviparity (live-bearing) has evolved from oviparity (egg-laying) in more than 100 lineages of squamate reptiles (lizards and snakes). This transition generally has occurred in cool climates, where thermal differentials between eggs in the (cool) nest versus the (warm) maternal oviduct influence embryonic development, in ways that may enhance offspring fitness. To identify specific traits potentially under selection, we incubated eggs of a montane scincid lizard at conditions simulating natural nests, maternal body temperatures, and an intermediate stage (2-week uterine retention of eggs prior to laying). Incubation at maternal temperatures throughout incubation affected the hatchling lizard's activity level and boldness, as well as its developmental rate, morphology, and locomotor ability. A treatment that mimicked the initial stages of the transition toward viviparity had a major effect on some hatchling traits (locomotor speeds), a minor effect on others (tail length, total incubation period) and no effect on yet others (offspring behaviors). More generally, different aspects of the phenotype are sensitive to incubation conditions at different stages of development; thus, the evolution of reptilian viviparity may have been driven by a succession of advantages that accrued at different stages of embryogenesis.
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影响因子：
5.2
作者：
C. Qualls;R. Shine
通讯作者：
C. Qualls;R. Shine
影响因子：
3.4
作者：
R. Medel;J. Jiménez;S. Fox;Fabian M Jaksic
通讯作者：
R. Medel;J. Jiménez;S. Fox;Fabian M Jaksic
影响因子：
1.3
作者：
Bajer, Katalin;Horvath, Gergely;Herczeg, Gabor
通讯作者：
Herczeg, Gabor
DOI：
10.1098/rspb.2010.1040
发表时间：
2011-01
期刊：
Proceedings of the Royal Society B: Biological Sciences
影响因子：
--
作者：
D. Warner;R. Shine
通讯作者：
D. Warner;R. Shine
影响因子：
2
作者：
T. Rodríguez-Díaz;Félix González;X. Ji;F. Braña
通讯作者：
T. Rodríguez-Díaz;Félix González;X. Ji;F. Braña