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Inbreeding depression in male gametic performance.

S Losdat1, S-M Chang, J M Reid

  • 1Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Aberdeen, UK.

Journal of Evolutionary Biology
|May 14, 2014
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Summary
This summary is machine-generated.

Inbreeding significantly reduces male fertility, impacting sperm and pollen performance. This study quantifies inbreeding depression in male gametes, revealing a substantial genetic load across diverse species.

Keywords:
gamete competitioninbreeding depressioninbreeding loadmale reproductive successmeta-analysispollen performancepollinationpost-copulatory sexual selectionsperm performance

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Area of Science:

  • Evolutionary ecology
  • Reproductive biology
  • Genetics

Background:

  • Inbreeding depression affects fitness components, with male fertilization success being a key area.
  • Male gametic performance (sperm/pollen) is crucial for fertilization, but inbreeding effects are poorly understood.
  • The impact of inbreeding on haploid gametes, despite inbreeding depression being a diploid trait, remains unclear.

Purpose of the Study:

  • To assess the magnitude of inbreeding depression in male gametic performance.
  • To review existing literature on inbreeding effects on sperm and pollen quantity, quality, and competitiveness.
  • To understand the implications for fertilization success and inbreeding avoidance strategies.

Main Methods:

  • Systematic review and meta-analysis of published studies estimating inbreeding depression in male gametic traits.
  • Compilation of data across 183 traits from 51 independent studies.
  • Analysis of inbreeding load in sperm and pollen performance metrics.

Main Results:

  • The overall inbreeding load in male gametic performance was estimated at approximately one haploid lethal equivalent.
  • Inbreeding depression was evident across diverse species and various gametic traits (quantity, quality, competitiveness).
  • A significant lack of data from wild populations was identified.

Conclusions:

  • Inbreeding substantially depresses male gametic performance, with significant implications for fertilization success.
  • The findings highlight the importance of considering gametic performance in evolutionary ecology and conservation.
  • Further research is needed on wild populations and the mechanisms (haploid vs. diploid expression) underlying gametic inbreeding depression.