A maladaptive parental effect: offspring survival decreases with maternal over-condition in an amphibian
A maladaptive parental effect: offspring survival decreases with maternal over-condition in an amphibian
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DOI：
10.1093/biolinnean/blad098
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发表时间：
2023-08-01
影响因子：
1.9
通讯作者：
Pfennig，Karin S.
中科院分区：
文献类型：
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作者：
Harmon，Emily A.;Li，Tianxiu;Pfennig，Karin S.
父母的影响通常被认为是一种进化的反应，父母传递有关环境的信息，以提高后代的适应性。然而，这些影响不一定是适应性的。在这里，我们提供了一个惊人的例子，提出证据表明，过度喂养的成年墨西哥spadefoot蟾蜍，Spea multiplicata，与后代生存率下降。在暂时改变它们的标准喂养方案后，S。繁殖在我们的圈养殖民地发展了一个更高的身体状况（即体重为一个给定的体长）比那些在野外。我们分析了随后三个实验的数据，发现尽管父亲的身体状况与蝌蚪的存活率呈正相关，但条件更高的母亲蝌蚪的存活率较低。我们的研究强调了肥胖如何通过适应不良的母体效应对后代产生负面影响。这种效应对于生活在可变环境中的动物（如铲足动物）尤其可能，这些动物进化出了“节俭表型”，使它们更容易肥胖。我们的研究还说明了通常被认为是有益的饲养条件可能是有害的。鉴于圈养繁殖计划越来越多地用于对抗世界范围内两栖动物的减少，这些计划必须考虑重点物种的生态和进化历史，以尽量减少任何适应不良的父母的影响。
Parental effects are often considered an evolved response, in which parents transmit information about the environment to enhance offspring fitness. However, these effects need not be adaptive. Here, we provide a striking example by presenting evidence that overfeeding of adult Mexican spadefoot toads,Spea multiplicata, is associated with decreased offspring survival. After a temporary change to their standard feeding regimen,S. multiplicatain our captive colony developed a much higher body condition (i.e. body mass for a given body length) than those in the wild. We analysed data from three subsequent experiments and found that although the body condition of a father was positively correlated with tadpole survival, mothers with a higher condition had lower tadpole survival. Our study highlights how obesity can negatively impact future generations via maladaptive maternal effects. Such effects could be especially likely for animals living in variable environments (such as spadefoots) that have evolved ‘thrifty phenotypes’ that make them prone to obesity. Our study also illustrates how husbandry conditions typically regarded as beneficial might be harmful. Given that captive breeding programmes are increasingly used to combat worldwide amphibian declines, these programmes must consider the ecology and evolutionary history of the focal species to minimize any maladaptive parental effects.