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首页> 外文期刊>Ethology >Rearing Environment Affects the Brain Size of Guppies: Lab-Reared Guppies have Smaller Brains than Wild-Caught Guppies
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Rearing Environment Affects the Brain Size of Guppies: Lab-Reared Guppies have Smaller Brains than Wild-Caught Guppies

机译：饲养环境会影响孔雀鱼的大脑大小：实验室饲养的孔雀鱼的大脑比野生孔雀鱼的大脑小

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Animals bred for captivity often have smaller brains and behave differently than their wild counterparts. These differences in brain size have been attributed to genetic changes resulting from, for example, inbreeding depression and pleiotropic effects of artificial selection for traits such as docility. A critical question, though, is whether these differences in brain size are due to plastic responses to the environment, not just genetic changes. We observed a large reduction in brain size in first generation, lab-reared female guppies compared with wild-caught ones (19% smaller telencephalon, 17% smaller optic tectum). We then reared first-generation, lab-born guppies in environments varying in spatial complexity and size in an attempt to isolate factors that might increase brain size and change temperament, but no significant differences in phenotype were observed. The results of these experiments show that, although the environmental factors responsible for the effect have not been found, even first generation lab-reared individuals can have smaller brains than wild individuals.
机译：为圈养而饲养的动物的大脑通常较小，其行为与野生动物不同。这些大脑大小的差异可归因于遗传变化，这些遗传变化是由近亲衰退和人工选择诸如温顺性状等多效性所引起的。但是，一个关键的问题是，大脑大小的这些差异是否是由于对环境的塑性反应，而不仅仅是遗传变化。我们观察到，与野生动物相比，第一代实验室饲养的雌性孔雀鱼的大脑大小大大减少（端脑​​小19％，视神经顶小17％）。然后，我们在空间复杂度和大小各异的环境中饲养了第一代实验室出生的孔雀鱼，试图分离出可能增加大脑大小和改变性情的因素，但未观察到表型的显着差异。这些实验的结果表明，尽管尚未找到造成这种现象的环境因素，但即使是第一代实验室饲养的个体也比野生个体的大脑更小。

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