The study examines the genome-wide diversity in moose populations in Sweden and finds limited impacts of the 1900s near-extinction event, but local variations in inbreeding, genetic load, and a risk of future reduction in genetic diversity and gene flow. The findings also indicate candidate genes for local adaptation and rapid temporal allele frequency shifts related to selective harvesting.
Ungulate species have experienced severe declines over the past centuries through overharvesting and habitat loss. Even if many game species have recovered thanks to strict hunting regulation, the genome-wide impacts of overharvesting are still unclear. Here, we examine the temporal and geographical differences in genome-wide diversity in moose (Alces alces) over its whole range in Sweden by sequencing 87 modern and historical genomes. We found limited impact of the 1900s near-extinction event but local variation in inbreeding and load in modern populations, as well as suggestion of a risk of future reduction in genetic diversity and gene flow. Furthermore, we found candidate genes for local adaptation, and rapid temporal allele frequency shifts involving coding genes since the 1980s, possibly due to selective harvesting. Our results highlight that genomic changes potentially impacting fitness can occur over short time scales and underline the need to track both deleterious and selectively advantageous genomic variation. Collection and analysis of 200 years of Swedish moose genomes reveals regional differences in genetic load, candidate regions for positive selection and an overall limited impact on human-driven bottlenecks on today's moose population.
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