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Population properties affect inbreeding avoidance in moose.

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  • 1Department of Biology, Centre for Biodiversity Dynamics, Norwegian University of Science and Technology, 7491 Trondheim, Norway ivar.herfindal@ntnu.no.

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Inbreeding avoidance in moose is less effective in small populations. Conservation efforts should focus on maintaining balanced sex ratios to improve inbreeding avoidance in vulnerable moose populations.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Conservation Genetics

Background:

  • Inbreeding depression, the reduction in fitness due to mating among close relatives, drives the evolution of inbreeding avoidance mechanisms.
  • These mechanisms can be compromised in small, isolated populations or those with skewed age or sex distributions, limiting mate choice.
  • Understanding factors influencing inbreeding avoidance is crucial for the conservation of endangered species.

Purpose of the Study:

  • To investigate the relationship between population structure (size and adult sex ratio) and the effectiveness of inbreeding avoidance in a Norwegian moose population.
  • To determine how population size and sex ratio influence the probability of realizing potential mating events between related individuals.

Main Methods:

  • Utilized a unique, individual-based dataset of moose from a small Norwegian island.
  • Analyzed the relationship between the inbreeding coefficient of potential offspring and the realization of mating events.
  • Assessed the influence of population size and adult sex ratio on the strength of this relationship.

Main Results:

  • The probability of a mating event occurring decreased as the inbreeding coefficient of potential offspring increased.
  • This inbreeding avoidance effect was more pronounced in years with a larger number or proportion of males in the population.
  • Population size and adult sex ratio significantly impact the degree of inbreeding avoidance observed.

Conclusions:

  • Inbreeding avoidance effectiveness in moose is modulated by population size and adult sex ratio.
  • Conservation strategies for small, isolated populations should prioritize managing sex ratios to enhance inbreeding avoidance.
  • Maintaining balanced sex ratios is a key factor for successful conservation of moose populations susceptible to inbreeding.