How can evolutionary theory accommodate recent empirical results on organismal senescence?

@article{Mitteldorf2007HowCE,
  title={How can evolutionary theory accommodate recent empirical results on organismal senescence?},
  author={Josh Mitteldorf and John W. Pepper},
  journal={Theory in Biosciences},
  year={2007},
  volume={126},
  pages={3-8}
}
According to a prominent recent report, guppies collected from sites lacking predators are inferior in every aspect of their life history profile to those evolved in other, nearby sites with predators present. This is an exception to two classical predictions of evolutionary theory: that low extrinsic mortality should be associated with longer life span, and that higher fertility should be associated with shorter life span. Some theorists have tried to accommodate this and other anomalous… 

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