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How many founders, how large a population?

Kevin Willis1, Raymond E Willis

  • 1Minnesota Zoo, Apple Valley, Minnesota 55124, USA. Kevin.Willis@State.MN.US

Zoo Biology
|February 4, 2010
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Summary
This summary is machine-generated.

Balancing population founders and size is key for retaining gene diversity. A cost-effectiveness model shows the optimal number of founders depends on the relative costs of increasing founders versus population size.

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Area of Science:

  • Population genetics
  • Conservation biology
  • Quantitative genetics

Background:

  • Gene diversity retention is crucial for long-term population viability.
  • Population size and the number of founders are key determinants of genetic diversity.
  • Current recommendations for founder numbers may not be cost-optimal.

Purpose of the Study:

  • To develop a model for determining the most cost-effective balance between the number of population founders and population size.
  • To identify optimal strategies for retaining gene diversity over specified timeframes.

Main Methods:

  • A model was developed comparing the marginal costs of increasing founder numbers versus population size.
  • Marginal costs were defined as the cost per additional animal for founders or population size.
  • The model evaluated cost-effectiveness for retaining 90% gene diversity over 10-15 generations.

Main Results:

  • The current recommendation of 20 effective founders is near the least-cost solution when marginal costs are equal.
  • The optimal number of founders significantly deviates from 20 when the ratio of marginal costs is not equal to one.
  • Cost-effectiveness is sensitive to the relative economic inputs for founder acquisition versus population growth.

Conclusions:

  • The optimal number of founders for gene diversity retention is contingent on the ratio of marginal costs.
  • A flexible approach considering economic factors is necessary for effective conservation strategies.
  • The 20-founder guideline may require adjustment based on specific cost-benefit analyses in conservation programs.