Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age.

@article{Descamps2007FemaleRS,
  title={Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age.},
  author={S{\'e}bastien Descamps and Stan Boutin and Dominique Berteaux and Jean-michel Gaillard},
  journal={The Journal of animal ecology},
  year={2007},
  volume={76 6},
  pages={1192-201}
}
Williams predicted that reproductive effort should increase as individuals age and their reproductive value declines. This simple prediction has proven difficult to test because conventional measures of energy expenditure on reproduction may not be a true reflection of reproductive effort. We investigated age-specific variation in female reproductive effort in a stable population of North American red squirrels where energy expenditure on reproduction is likely to reflect actual reproductive… CONTINUE READING
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