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Related Experiment Video

Updated: Oct 25, 2025

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Published on: October 5, 2018

Why don't all animals avoid inbreeding?

Victoria L Pike¹, Charlie K Cornwallis², Ashleigh S Griffin¹

¹Department of Zoology, University of Oxford, Oxford OX1 3SZ, UK.

Proceedings. Biological Sciences

|August 4, 2021

Summary

This summary is machine-generated.

Species avoid mating with relatives to prevent inbreeding depression, which harms offspring. This study reveals that inbreeding avoidance strategies evolve only when inbreeding risks are high and related individuals frequently encounter each other.

Keywords:

inbreeding avoidance inbreeding depression random mating

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Published on: May 7, 2021

Area of Science:

Evolutionary Biology
Behavioral Ecology
Genetics

Background:

Inbreeding, mating between relatives, can reduce offspring fitness (inbreeding depression).
Selection is assumed to favor inbreeding avoidance, but its strength varies across species.
Numerous species do not avoid mating with relatives, suggesting complex evolutionary drivers.

Purpose of the Study:

To investigate if the frequency of encounters between related individuals explains variation in inbreeding avoidance across species.
To determine the conditions under which mechanisms for inbreeding avoidance evolve.

Main Methods:

Phylogenetic meta-analysis of 41 animal species from six classes.
Examined the relationship between encounter rates of relatives, inbreeding depression severity, and the presence of inbreeding avoidance mechanisms.

Main Results:

Species avoiding relatives either had low encounter rates with kin or negligible inbreeding depression.
Mechanisms for inbreeding avoidance (e.g., mate choice, biased dispersal) were present only in species experiencing inbreeding depression.
Inbreeding avoidance evolves when both the risk of inbreeding depression and frequent encounters with relatives exist.

Conclusions:

Encounter frequency and inbreeding depression severity are key factors shaping the evolution of inbreeding avoidance.
Inbreeding avoidance is not a universal trait but evolves conditionally based on ecological and genetic factors.
Understanding these factors provides insight into the diversity of mating strategies across the animal kingdom.