Density Triggers Maternal Hormones That Increase Adaptive Offspring Growth in a Wild Mammal
Density Triggers Maternal Hormones That Increase Adaptive Offspring Growth in a Wild Mammal
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DOI：
10.1126/science.1235765
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发表时间：
2013-06-07
期刊：
影响因子：
56.9
通讯作者：
McAdam, Andrew G.
中科院分区：
文献类型：
--
作者：
Dantzer, Ben;Newman, Amy E. M.;McAdam, Andrew G.
在波动的环境中，母亲可能会通过调整后代的表型来适应他们独立时所经历的环境，从而提高后代的适应性。在自由放养的红松鼠中，自然选择对后代出生后生长速度的影响因种群密度而异，在高密度条件下，选择有利于生长更快的后代。我们发现，母亲暴露于高密度的线索，通过领土发声回放完成，导致后代的生长速度增加，在没有额外的食物资源。实验海拔的实际和感知密度诱导更高的母体糖皮质激素水平，和女性自然或实验增加糖皮质激素产生的后代，生长速度比对照组。因此，反映人口密度的社会线索，足以引起后代的增长，通过适应性的繁殖介导的母体效应。
In fluctuating environments, mothers may enhance the fitness of their offspring by adjusting offspring phenotypes to match the environment they will experience at independence. In free-ranging red squirrels, natural selection on offspring postnatal growth rates varies according to population density, with selection favoring faster-growing offspring under high-density conditions. We show that exposing mothers to high-density cues, accomplished via playbacks of territorial vocalizations, led to increased offspring growth rates in the absence of additional food resources. Experimental elevation of actual and perceived density induced higher maternal glucocorticoid levels, and females with naturally or experimentally increased glucocorticoids produced offspring that grew faster than controls. Therefore, social cues reflecting population density were sufficient to elicit increased offspring growth through an adaptive hormone-mediated maternal effect.