Postreproductive lifespans are rare in mammals.

Postreproductive lifespans are rare in mammals.
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DOI:
10.1002/ece3.3856
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发表时间:
2018-03
影响因子:
2.6
通讯作者:
Croft DP
Croft DP
中科院分区:
生物学2区
文献类型:
--
作者:
Ellis S;Franks DW;Nattrass S;Cant MA;Bradley DL;Giles D;Balcomb KC;Croft DP

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一个物种有一个生殖后阶段,如果像人类一样,进入成年种群的雌性在最后一次生殖活动后可以预期生活在很大程度上。然而,区分这些真实的生殖后阶段和通常的衰老过程在概念上和统计上都是具有挑战性的,这可能会导致雌性偶尔在最后一次生殖事件后存活下来。因此,尽管有相当大的兴趣,但生殖后阶段的分类学流行率仍然不清楚,也存在争议。在这项研究中,我们使用根据已公布的哺乳动物野生种群数据构建的生命表,以及生殖后寿命的统计指标,来区分52个物种的真实生殖后阶段与衰老和人口统计学的假象。我们发现哺乳动物的生殖后阶段很少见,而且仅限于人类和少数种类的齿鲸。通过解决这一长期存在的争论,我们希望为进化生物学领域的研究人员提供清晰的信息,并为进一步研究这种不同寻常的生活史特征的进化和适应意义奠定坚实的基础。
A species has a post‐reproductive stage if, like humans, a female entering the adult population can expect to live a substantial proportion of their life after their last reproductive event. However, it is conceptually and statistically challenging to distinguish these true post‐reproductive stages from the usual processes of senescence, which can result in females occasionally surviving past their last reproductive event. Hence, despite considerable interest, the taxonomic prevalence of post‐reproductive stages remains unclear and debated. In this study we use life tables constructed from published data on wild populations of mammals, and statistical measures of post‐reproductive lifespans, to distinguish true post‐reproductive stages from artefacts of senescence and demography in 52 species. We find post‐reproductive stages are rare in mammals and are limited to humans and a few species of toothed whales. By resolving this long‐standing debate, we hope to provide clarity for researchers in the field of evolutionary biology and a solid foundation for further studies investigating the evolution and adaptive significance of this unusual life history trait.
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发表时间: 1995-07-01
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