Relative costs of offspring sex and offspring survival in a polygynous mammal.

Relative costs of offspring sex and offspring survival in a polygynous mammal.
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DOI:
10.1098/rsbl.2016.0417
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发表时间:
2016-09
期刊:
影响因子:
3.3
通讯作者:
Kruuk LE
Kruuk LE
中科院分区:
生物学2区
文献类型:
--
作者:
Froy H;Walling CA;Pemberton JM;Clutton-Brock TH;Kruuk LE

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繁殖成本预计在野生动物种群中无处不在,了解这些成本变化的驱动因素是生活史进化理论的一个重要方面。我们使用野生马鹿种群43年的数据集来检验影响母亲繁殖成本的两个因素的相对重要性,并测试这些成本是否随着生态条件的变化而变化。与之前的研究一样,我们的分析表明哺乳的适宜成本:在夏季存活的母亲随后表现出比出生后不久死亡的母亲更低的存活率和繁殖力,分别占母亲存活率和繁殖力变化的5%和14%。与雌性相比,雄性小牛的生产对母牛存活率和繁殖力的影响更大,但对这两个健康成分的变异的解释都不到1%。没有证据表明,随着种群密度的增加,小牛存活率或性别的影响有任何变化。
Costs of reproduction are expected to be ubiquitous in wild animal populations and understanding the drivers of variation in these costs is an important aspect of life-history evolution theory. We use a 43 year dataset from a wild population of red deer to examine the relative importance of two factors that influence the costs of reproduction to mothers, and to test whether these costs vary with changing ecological conditions. Like previous studies, our analyses indicate fitness costs of lactation: mothers whose calves survived the summer subsequently showed lower survival and fecundity than those whose calves died soon after birth, accounting for 5% and 14% of the variation in mothers' survival and fecundity, respectively. The production of a male calf depressed maternal survival and fecundity more than production of a female, but accounted for less than 1% of the variation in either fitness component. There was no evidence for any change in the effect of calf survival or sex with increasing population density.
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发表时间: 1990-05-01
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