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在流鸟中,非典型的精子形态的独立进化

Melissah Rowe¹, Daniel M Hooper², Antje Hofgaard³

¹Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), 6700 AB, Wageningen, The Netherlands.

Journal of evolutionary biology

|July 4, 2025

概括

红眉表现出不寻常的精子形态,与典型的鸟不同. 这种独特的精子表型可能与放松的性选择和缺乏精子竞争有关.

科学领域:

进化生物学进化生物学
生殖生物学生殖生物学
鸟类学鸟类学是一门学科.

背景情况:

精子形态在不同物种之间有很大差异,但鸟通常共享一种保存的细状精子表型.
之前的研究指出,牛种 (Pyrrhula pyrrhula 和 P. murina) 的精子形态异常.
红眉 (Neochmia temporalis temporalis) 的标称亚种呈现了一种在鸟中异化的精子形态的新奇案例.

研究的目的:

为了描述红眉 (Neochmia temporalis temporalis) 的精子形态.
为了研究这种不寻常的精子表型背后的进化起源和潜在的选择性压力.
探索鸟类精子形态进化的遗传和发育基础.

主要方法:

红眉的精子形态分析.
全基因组数据分析以评估遗传变异和人口瓶.
相对丸大小测量以推断后交配性选择的水平.

主要成果:

红眉尖的精子是非filiform,具有圆形的头部和一个非常短的中间部分,类似的假定新生精子.
没有证据表明与不寻常的精子表型相关的遗传变异减少或人口瓶.
相对丸大小数据表明,放松的合后性选择可能有助于非典型精子形态的演变.

结论:

红眉代表了第二个记录的例子,标志着类精子表型的显著进化转变.
放松的性选择是潜在的驱动因素,尽管突变,遗传漂移和搭便车也可能起作用.
需要进一步的研究,以了解精子形态学中这些戏剧性的进化变化的发育和基因组基础.

关键词:

雌幼儿科 (Estrildidae) 是一个幼儿科.遗传瓶 - - 遗传瓶是一种瓶.遗传上的搭便车.精子的演化精子的演化精子的演化精子大小精子大小精子大小精子超结构精子超结构

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