Analyses of ovarian activity reveal repeated evolution of post-reproductive lifespans in toothed whales.
Analyses of ovarian activity reveal repeated evolution of post-reproductive lifespans in toothed whales.
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DOI：
10.1038/s41598-018-31047-8
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发表时间：
2018-08-27
影响因子：
4.6
通讯作者：
Croft DP
中科院分区：
文献类型：
--
作者：
Ellis S;Franks DW;Nattrass S;Currie TE;Cant MA;Giles D;Balcomb KC;Croft DP
在大多数物种中，生殖系统的衰老速度与躯体组织的衰老速度相同，个体继续繁殖直到死亡。然而，人类、虎鲸和短鳍领航鲸这三个物种的雌性已经被证明相对于身体衰老而言，生殖衰老的速度明显加快。在这些物种中，很大一部分雌性的寿命超过了它们的生殖寿命：它们有一个生殖后寿命。对这种令人困惑的生活史策略的研究受到难以量化野生种群生殖衰老速率的阻碍。在这里，我们提出了一种方法来测量生殖衰老的相对速度在齿鲸使用已发表的生理数据。在16个有数据可查的物种中（不包括虎鲸），我们发现有三个物种的生殖后寿命很长：短鳍领航鲸、白鲸和独角鲸。系统发育重建表明，雌性生殖后寿命在齿鲸中独立进化了几次。我们的研究是白鲸和独角鲸生殖后寿命显著延长的第一个证据，当与虎鲸生殖后寿命的证据结合在一起时，已知在野外表现出生殖后寿命的非人类哺乳动物的数量增加了一倍。
In most species the reproductive system ages at the same rate as somatic tissue and individuals continue reproducing until death. However, females of three species – humans, killer whales and short-finned pilot whales – have been shown to display a markedly increased rate of reproductive senescence relative to somatic ageing. In these species, a significant proportion of females live beyond their reproductive lifespan: they have a post-reproductive lifespan. Research into this puzzling life-history strategy is hindered by the difficulties of quantifying the rate of reproductive senescence in wild populations. Here we present a method for measuring the relative rate of reproductive senescence in toothed whales using published physiological data. Of the sixteen species for which data are available (which does not include killer whales), we find that three have a significant post-reproductive lifespan: short-finned pilot whales, beluga whales and narwhals. Phylogenetic reconstruction suggests that female post-reproductive lifespans have evolved several times independently in toothed whales. Our study is the first evidence of a significant post-reproductive lifespan in beluga whales and narwhals which, when taken together with the evidence for post-reproductive lifespan in killer whales, doubles the number of non-human mammals known to exhibit post-reproductive lifespans in the wild.
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影响因子：
2.6
作者：
Ellis S;Franks DW;Nattrass S;Cant MA;Bradley DL;Giles D;Balcomb KC;Croft DP
通讯作者：
Croft DP
DOI：
10.1098/rspb.2012.2552
发表时间：
2013-02-07
影响因子：
4.7
作者：
Colbeck, Gabriel J.;Duchesne, Pierre;Turgeon, Julie
通讯作者：
Turgeon, Julie
DOI：
10.1073/pnas.0711911105
发表时间：
2008-04-08
影响因子：
11.1
作者：
Cant, Michael A.;Johnstone, Rufus A.
通讯作者：
Johnstone, Rufus A.
影响因子：
56.9
作者：
Foster, Emma A.;Franks, Daniel W.;Croft, Darren P.
通讯作者：
Croft, Darren P.
影响因子：
2.3
作者：
Ferreira, Ines M.;Kasuya, Toshio;Best, Peter B.
通讯作者：
Best, Peter B.