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胎盘的进化与波西里鱼类大脑大小的增加无关
P K Rowiński1, J Näslund1,2, W Sowersby1,3
1Department of Zoology, Stockholm University, 106 91 Stockholm, Sweden.
Journal of evolutionary biology
|December 11, 2025
概括
通过胎盘结构 (母体缩) 的母体投资并没有增加鱼类的后代大脑大小. 这项研究发现,胎盘和非胎盘鱼类之间的大脑发育没有差异.
科学领域:
- 进化生物学是进化的生物学.
- 比较生理学比较生理学
- 神经科学是一个神经科学.
背景情况:
- 母亲的投资影响后代的器官大小,特别是大脑.
- 胎盘生物提供产前营养,可能会影响大脑发育.
- 之前的研究集中在哺乳动物与产前和产后供应.
研究的目的:
- 为了调查胎盘结构 (母体缩) 是否导致在小鱼中对后代大脑发育的投资比非胎盘 (乳腺缩) 策略更大.
- 为了测试这种假设,即由于较高的营养供应率,母缩导致后代的大脑大小更大.
主要方法:
- 在八种有着不同的母体供应策略 (母体缩与乳糖缩) 的鱼物种中比较大脑大小和体质生长.
- 在后代生命的前四周使用了对大脑大小的非侵入性测量.
- 在本体遗传发育过程中分析了相对大脑大小的变化.
主要成果:
- 在母体养性和乳糖养性小类物种之间没有发现后代大脑大小的显著差异.
- 在具有胎盘和非胎盘策略的物种之间,相对的大脑大小在其本体遗传轨迹上没有差异.
- 这些发现与哺乳动物的观察结果形成鲜明对比,这表明单独产前供给可能会限制母亲对大脑大小的投资效应.
结论:
- 胎盘结构和青少年大脑大小之间的共同进化并不是脊椎动物之间普遍的模式.
- 鱼类的产前营养供应可能不会像哺乳动物那样为母亲对大脑发育的投资提供同样的潜力.
- 需要进一步研究,以了解不同脊椎动物群体中大脑大小演变的具体机制和进化约束.
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