A renewed glance at the Palearctic golden eagle: genetic variation in
space and time
Abstract
Anthropogenic pressures on nature have been causing population declines
for centuries. Intensified persecution of apex predators, like the
golden eagle, resulted in population bottlenecks during the
19th-20th centuries. To study
population genetics and demographic history of the golden eagle
throughout its distribution, we collected museum samples from previously
underrepresented regions, such as Russia and Central Asia. We used 12
microsatellite loci and a fragment of the mitochondrial DNA control
region to re-evaluate phylogeography of Eurasian golden eagles and study
the impacts of the population bottleneck. Our results revealed a
north-south genetic gradient, expressed by the difference of
Mediterranean and Holarctic lineages, as well as genetically distinct
Northern Europe and Central Asia and Caucasus regions. Furthermore,
Northern Europe exhibited the lowest, whereas Central Asia and Caucasus
had the highest genetic diversity. Although golden eagles maintained
relatively high genetic diversity, we detected genetic signatures of the
recent bottleneck, including reduced genetic diversity and a decline in
the effective female population size around the year 1975. Our study
improves the knowledge of the genetic composition of Eurasian golden
eagles and highlights the importance of understanding their historical
population dynamics in the face of ongoing and future conservation
efforts.