尤卡坦半岛特有的河口蛹鱼胚胎的发育生态学:水中生存、代谢抑制和非同步孵化。

IF 2 3区 生物学 Q2 ANATOMY & MORPHOLOGY
Omar Domínguez-Castanedo, Sharon Valdez-Carbajal
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引用次数: 0

摘要

背景:根据理论预测,在幼体死亡率高但卵安全的环境中,孵化期延长的抗旱胚胎更有利于进化。在此,我们在常见的花园条件下,实验测试了三种孵化温度和培养基对河口蛹鱼 Garmanella pulchra 的胚胎发育长度、离水孵化时间、存活率、代谢率和孵化动态的影响。我们还描述了与暴露在空气中有关的胚胎皮层结构的形态变化:结果:我们发现,在低温和中温条件下离水孵化的胚胎孵化期延长,超出了其孵化能力,新陈代谢严重抑制。此外,这些胚胎还表现出与水供应无关的孵化不同步现象。在高温下孵化的胚胎没有出现孵化期延长的现象,但出水存活的几率下降。我们对胚胎皮层结构的形态学观察显示,细胞周围空间和毛状细丝缓冲了干旱的有害影响:我们的研究结果表明,G. pulchra具有两种不同现象的典型生命史特征:延迟孵化和休眠;支持它们之间真正的连续性,而不是二分法。这些特征的进化可能与它们栖息的尤卡坦河河口退潮时的空中暴露有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Developmental ecology in embryos of an estuarine pupfish endemic of the Yucatan peninsula: Survival out of water, metabolic depression, and asynchronous hatching.

Background: Theory predicts that drought-resistant embryos with extended incubations are evolutionarily favored in environments with high mortality of larvae but safe for eggs. Here, we experimentally test, under common garden conditions, the effect of three incubation temperatures and media on embryonic developmental length, extended incubation out of the water, survival, metabolic rate, and hatching dynamics in the estuarine pupfish Garmanella pulchra. We also described the morphological changes of embryonic cortical structures related to air exposure.

Results: We found that embryos incubated out of water in low and medium temperatures present an extended incubation period beyond their hatching capability with a deep metabolic depression. Also, these embryos exhibited a hatching asynchrony not related to water availability. Embryos incubated at high temperatures did not show extended incubation, with decreased probability of survival out of water. Our morphological observations of the embryonic cortical structures reveal that the perivitelline space and hair-like filaments buffer the deleterious drought effects.

Conclusions: Our results reveal that G. pulchra possesses life-history traits typical of two separate phenomena: delay hatching and diapause; supporting a true continuum between them, rather than a dichotomy. The evolution of these traits may respond to aerial exposure during low tides in the estuaries of Yucatán they inhabit.

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来源期刊
Developmental Dynamics
Developmental Dynamics 生物-发育生物学
CiteScore
5.10
自引率
8.00%
发文量
116
审稿时长
3-8 weeks
期刊介绍: Developmental Dynamics, is an official publication of the American Association for Anatomy. This peer reviewed journal provides an international forum for publishing novel discoveries, using any model system, that advances our understanding of development, morphology, form and function, evolution, disease, stem cells, repair and regeneration.
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