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Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...

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Related Experiment Video

Updated: Dec 15, 2025

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Published on: August 8, 2017

Does harvest affect genetic diversity in grey wolves?

David E Ausband¹, Lisette Waits²

¹Idaho Cooperative Fish and Wildlife Research Unit, U.S. Geological Survey, University of Idaho, Moscow, ID, USA.

Molecular Ecology

|July 14, 2020

Summary

Wolf harvest impacts genetic diversity by increasing relatedness between groups and introducing new alleles, though individual genetic measures remain largely unaffected. This suggests harvest influences population structure more than individual wolf genetics.

Keywords:

Canis lupus allelic richness genetic diversity grey wolf harvest heterozygosity relatedness

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Last Updated: Dec 15, 2025

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Area of Science:

Wildlife Ecology
Conservation Genetics
Population Genetics

Background:

Harvesting can influence wildlife population dynamics and genetic health.
Grey wolves (Canis lupus) exhibit social structures where effective population size is a fraction of total abundance, potentially increasing sensitivity to harvest impacts on genetic diversity.

Purpose of the Study:

To investigate the effects of harvest on genetic diversity and relatedness in grey wolf populations.
To test hypotheses regarding changes in within- and between-group relatedness, individual heterozygosity, allelic richness, and allele composition due to harvest.

Main Methods:

Analysis of genetic data from grey wolf populations experiencing harvest.
Evaluation of relatedness, heterozygosity, and allelic richness metrics in relation to harvest levels and population structure.

Main Results:

Harvest did not significantly affect individual heterozygosity or within-subpopulation allelic richness.
A small, biologically insignificant effect was observed on within-group relatedness.
Harvest was positively associated with increased between-group relatedness and a net gain of alleles into groups.
A decline in the number of private alleles within subpopulations was observed.

Conclusions:

Harvest influences grey wolf genetic diversity at the group and population levels, primarily by increasing inter-group relatedness and facilitating gene flow.
Effects on individual genetic diversity were less apparent, likely due to population sizes studied.
Harvest may promote immigration and breeding between groups, altering population genetic structure over time.