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Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon.

Charles Perrier1, Éric Normandeau1, Mélanie Dionne2

  • 1Département de Biologie, Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval Québec, Canada.

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|January 2, 2015
PubMed
Summary
This summary is machine-generated.

Mature male parr significantly boost Atlantic salmon effective breeders and genetic diversity. Their contribution increases the number of breeders and alleles, aiding conservation efforts for declining populations.

Keywords:
Effective population sizeeffective number of breedersgenetic diversitykinshipparentage analysisrelatednessreproductive successreproductive tactic.

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Area of Science:

  • Population Genetics
  • Evolutionary Biology
  • Conservation Science

Background:

  • Non-anadromous males, such as mature male parr, participate in Atlantic salmon reproduction.
  • Their specific impact on population genetic parameters remains largely unquantified.

Purpose of the Study:

  • To assess the contribution of Atlantic salmon mature male parr to the effective number of breeders (Nb).
  • To evaluate their impact on allelic richness and breeder relatedness.
  • To understand the evolutionary and conservation implications of their reproductive role.

Main Methods:

  • Utilized a wild Atlantic salmon population pedigree reconstruction.
  • Employed demographic methods (variance in reproductive success) and genetic methods (linkage disequilibrium) to estimate Nb.
  • Analyzed the number of alleles and relatedness among breeders.

Main Results:

  • Mature male parr increased the effective number of breeders (Nb) by 1.79 (demographic) and 1.85 (genetic) times.
  • Mature male parr enhanced the number of alleles in offspring.
  • Mature male parr exhibited lower relatedness to anadromous females compared to anadromous males, likely due to asynchronous maturation.

Conclusions:

  • Mature male parr play a crucial role in increasing effective breeding numbers and allelic richness.
  • Their contribution can decrease inbreeding within Atlantic salmon populations.
  • Understanding and incorporating the reproductive role of mature male parr is vital for the conservation of declining Atlantic salmon populations.