Finland's wolf population faces genetic collapse, study warns
A genetic analysis of Finnish wolves reveals declining diversity and rising inbreeding over two decades, with the population split into isolated subgroups that cannot sustain themselves under current conditions. The findings challenge how European nations manage protected wolf populations under EU law and could reshape conservation policy across Scandinavia.
Originaltitel: Genetic Decline and Minimum Viable Population Estimates for the Finnish Wolf population
Effective management of the wolf ( Canis lupus ) population in Finland requires defining a genetics-based minimum viable population (MVP) to support the national Favourable Reference Population (FRP) reporting under the EU Habitats Directive. An analysis of long-term and contemporary genetic data from Finnish wolves, together with samples from Scandinavia and Russian Karelia, was carried out to quantify trends in individual heterozygosity, contemporary and historical effective population sizes ( N e ), genetic substructure, and gene flow across regions. Temporal analysis confirmed a persistent decline in genetic diversity and increasing inbreeding levels in Finland over the last two decades. Contemporary data show that the Finnish population consists of two genetically distinct subpopulations; Western Finland and Eastern Finland/Russia, which are connected by low migration rates. These subpopulations are further connected to the Scandinavian and Russian Karelian wolf populations, again with similarly low effective migration rates. Under current demographic conditions and migration rates, neither the Finnish population nor the broader Fennoscandian metapopulation were predicted to reach genetically sustainable long‑term effective population sizes. Applying established short‑term conservation thresholds (the 100/1000 rule) to the two Finnish subpopulations would require a combined MVP of 628 wolves over the next five generations to avoid rising inbreeding levels. Overall, the results demonstrate continuing genetic deterioration in the Finnish wolf population and emphasise that long‑term viability cannot be achieved within Finland alone. Long‑term thresholds ( N e ≥ 1000), corresponding to census sizes >3000 wolves, are not ecologically feasible within Finland. It is therefore vital to ensure connectivity within Fennoscandia, particularly across the Finnish-Russian border. This is essential for preventing inbreeding depression and loss of long-term evolutionary adaptability in a changing environment.