Evidence for a recent population bottleneck in an Apicomplexan parasite of caribou and reindeer, Besnoitia tarandi

► Besnoitia tarandi parasites were genotyped in reindeer and caribou. ► Isolates in Canada and Finland were found to be identical at several markers. ► Nonetheless, other species of Besnoitia did vary at these loci. ► Parasites in the Arctic, therefore, have evidently undergone a recent bottleneck.