Now showing items 1-4 of 4

  • Analyses of ovarian activity reveal repeated evolution of post-reproductive lifespans in toothed whales 

    Ellis, S; Franks, D; Nattrass, S; Currie, T; Cant, M; Giles, D; Balcomb, K; Croft, D (Springer Nature, 2018-08-27)
    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 ...
  • Mortality risk and social network position in resident killer whales: sex differences and the importance of resource abundance 

    Ellis, S; Franks, DW; Nattrass, S; Cant, MA; Weiss, MN; Giles, D; Balcomb, KC; Croft, DP (Royal Society, 2017-10-25)
    An individual’s ecological environment affects their mortality risk, which in turn has fundamental consequences for life history evolution. In many species social relationships are likely to be an important component of ...
  • Post-reproductive lifespans are rare in mammals 

    Ellis, S; Franks, DW; Nattrass, S; Cant, M; Bradley, DL; Giles, D; Balcomb, K; Croft, DP (Wiley, 2018-01-31)
    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 ...
  • Reproductive conflict and the evolution of menopause in killer whales 

    Croft, DP; Johnstone, RA; Ellis, S; Nattrass, S; Franks, DW; Brent, LJN; Mazzi, S; Balcomb, C; Ford, JKB; Cant, MA (Elsevier (Cell Press), 2017-01-12)
    Why females of some species cease ovulation prior to the end of their natural lifespan is a longstanding evolutionary puzzle [1-4]. The fitness benefits of post-reproductive helping could in principle select for menopause ...