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Pedigree-Based Estimation of Reproductive Value.

Darren C Hunter1, Josephine M Pemberton1,2, Jill G Pilkington1

  • 1Dyers Brae House, School of Biology, University of St Andrews, St Andrews, UK.

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|July 2, 2019
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Summary

Reproductive value, crucial for evolution, can be estimated using pedigree data. Genetic contributions stabilize within decades, making pedigree calculations reliable for studying wild populations.

Keywords:
Ovis ariesSoay sheepgenetic contributionpedigreereproductive value

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Demography
  • Quantitative Genetics

Background:

  • Reproductive value quantifies an individual's genetic contribution to future generations, essential for understanding selection and evolution.
  • Estimating reproductive value directly often requires long-term studies of pedigreed populations.
  • The convergence of pedigree-based genetic contributions to long-run reproductive values within available data time frames remains unclear.

Purpose of the Study:

  • To develop a system for calculating expected genetic representation using pedigree data.
  • To infer individual and cohort reproductive values in a wild population.
  • To assess the stability of pedigree-based genetic contributions over time.

Main Methods:

  • Developed a novel system for pedigree-based calculation of expected genetic representation.
  • Applied the system to estimate individual and cohort reproductive values in Soay sheep (Ovis aries).
  • Analyzed genetic contributions over time to assess their stability.

Main Results:

  • The developed system successfully calculated expected genetic representation from pedigree data.
  • Genetic contributions of individuals and cohorts showed relative stability within modest time frames.
  • Estimates of reproductive value stabilized within decades in the studied Soay sheep population.

Conclusions:

  • Pedigree-based calculations of genetic contributions can serve as reliable estimates of reproductive value.
  • The observed stability of estimates within decades supports their use in evolutionary and demographic studies.
  • This approach offers new avenues for analyzing data from pedigreed wild populations.