The functional significance of residual yolk in lizards.

IF 1.6 2区 生物学 Q2 ZOOLOGY
Current Zoology Pub Date : 2023-04-01 DOI:10.1093/cz/zoac098
Kun Guo, Cai-Feng Wang, Yu Du, Yan-Fu Qu, Florentino Braña, Xiang Ji
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Abstract

Residual yolk is assumed to be an important source of energy and nutrients during early life in nonmammalian amniotes. Available data show that the mean size of residual yolk is far smaller in lizards than in turtles, snakes, crocodiles, and birds, raising a question of whether residual yolk is of functional significance in lizards. Here, we compared data from 26 lizard species with those from other nonmammalian amniotes to test the hypothesis that residual yolk is functionally less significant in species producing more fully developed offspring. In our sample, species mean offspring water contents ranged from 73% to 84% of body wet mass; species mean proportions of carcass dry mass, fat-body dry mass, and residual yolk dry mass to offspring dry mass ranged from 84% to 99%, 0% to 5.0%, and 0% to 14.4%, respectively. Lizards are, on average, more fully developed at hatching or birth than snakes, as revealed by the fact that the mean proportion of carcass dry mass to body dry mass and offspring water contents were both higher in lizards than in snakes. We conclude that the functional significance of residual yolk during early life is generally less evident in lizards. Even in the lizards where residual yolk is of potential functional significance, this portion of yolk contributes little, if any, to postembryonic growth. Future work could usefully collect data across a wider spectrum of reptile taxa to establish a precocial-altricial continuum and test the hypothesis that species with a smaller amount of residual yolk are closer to the precocial end of the continuum.

Abstract Image

蜥蜴残余蛋黄的功能意义。
残余蛋黄被认为是非哺乳动物羊膜动物早期生命中重要的能量和营养来源。现有数据表明,蜥蜴的残余蛋黄的平均大小远远小于海龟、蛇、鳄鱼和鸟类,这就提出了一个问题,即残余蛋黄在蜥蜴中是否具有功能意义。在这里,我们将26种蜥蜴的数据与其他非哺乳动物羊膜动物的数据进行了比较,以验证在产生更充分发育后代的物种中,残余蛋黄在功能上不太重要的假设。在我们的样本中,物种的平均后代含水量为身体湿质量的73%至84%;胴体干质量、脂肪体干质量和残余蛋黄干质量占子代干质量的平均比例分别为84% ~ 99%、0% ~ 5.0%和0% ~ 14.4%。平均而言,蜥蜴在孵化或出生时比蛇发育得更充分,这一事实表明,蜥蜴的胴体干质量与身体干质量的平均比例和后代的含水量都高于蛇。我们的结论是,在蜥蜴的早期生活中,残余蛋黄的功能意义通常不太明显。即使在残余蛋黄具有潜在功能意义的蜥蜴中,这部分蛋黄对胚胎后生长的贡献很小,如果有的话。未来的工作可以在更广泛的爬行动物分类群中收集有用的数据,以建立一个早生-晚生连续体,并测试具有少量残余蛋黄的物种更接近连续体的早生末端的假设。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Current Zoology
Current Zoology Agricultural and Biological Sciences-Animal Science and Zoology
CiteScore
3.20
自引率
9.10%
发文量
111
审稿时长
6 weeks
期刊介绍: About the Journal Current Zoology (formerly Acta Zoologica Sinica, founded in 1935) is an open access, bimonthly, peer-reviewed international journal of zoology. It publishes review articles and research papers in the fields of ecology, evolution and behaviour. Current Zoology is sponsored by Institute of Zoology, Chinese Academy of Sciences, along with the China Zoological Society.
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