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Balancing Inbreeding and Outbreeding Risks to Inform Translocations Throughout the Range of an Imperiled Darter.

Brendan N Reid^1,2, Jordan Hofmeier³, Harry Crockett⁴

¹Department of Ecology and Evolution University of California Santa Cruz Santa Cruz California USA.

Evolutionary Applications

|March 25, 2025

Summary

This summary is machine-generated.

Assisted migration can conserve genetic diversity in threatened species like the Arkansas Darter (Etheostoma cragini). Genomic analysis revealed population structure and identified suitable sites for translocation, minimizing risks and aiding species persistence.

Keywords:

conservation planning genetic rescue indels small populations streamscape genomics

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Area of Science:

Conservation genetics
Population genomics
Ecology

Background:

Assisted migration is crucial for maintaining genetic diversity and preventing species extirpation.
Balancing benefits of population reconnection with risks of outbreeding depression requires detailed genomic knowledge.

Purpose of the Study:

To characterize genomic diversity and differentiation of the Arkansas Darter (Etheostoma cragini) across its range.
To inform assisted migration strategies by assessing genetic variation and population structure.

Main Methods:

Reduced-representation and whole-genome sequencing were employed.
Genomic diversity, population structure, and genetic isolation were analyzed.

Main Results:

Strong population structure and significant variation in genetic diversity and effective population sizes were observed across drainages.
Genetic isolation varied by river distance and surrounding landscape features.
Low evidence of recent inbreeding or elevated deleterious variation was found in smaller populations.

Conclusions:

Genomic insights can guide translocation strategies for species conservation.
Identifying suitable donor and recipient populations is key to successful assisted migration and genetic rescue.
Proactive planning minimizes translocation risks and enhances long-term species persistence.