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Area of Science:

  • Evolutionary biology
  • Genetics
  • Animal behavior

Background:

  • Inbreeding depression, characterized by reduced fitness in offspring from related individuals, can manifest differently between sexes.
  • Existing empirical evidence suggests sex-specific vulnerabilities to inbreeding depression, yet a unifying theoretical framework is absent.
  • Conflicting study results obscure the generality, direction, and magnitude of sex-specific inbreeding depression.

Purpose of the Study:

  • To conduct a meta-analysis to quantitatively assess sex-specific differences in the magnitude of inbreeding depression.
  • To investigate the correlation between inbreeding coefficient and inbreeding depression.
  • To explore potential factors contributing to unexplained heterogeneity in sex-specific inbreeding depression.

Main Methods:

  • Synthesized 321 effect sizes from experimental studies across 47 species.
  • Employed meta-analysis techniques to aggregate and analyze data on inbreeding depression.
  • Examined factors including sexual size dimorphism, heterogamety, trait type, and environmental stress.

Main Results:

  • A small but significant difference in inbreeding depression was detected between sexes, with females exhibiting slightly higher levels.
  • A positive correlation was observed between the inbreeding coefficient and the magnitude of inbreeding depression.
  • Significant unexplained heterogeneity persisted even after accounting for various biological and environmental factors.

Conclusions:

  • Females may be slightly more susceptible to inbreeding depression than males.
  • Further research is needed to elucidate the specific causes and prevalence of sex differences in inbreeding depression across diverse species.
  • Understanding sex-specific inbreeding depression is crucial for comprehending its broader evolutionary consequences.