Belugas' Secret to Genetic Health Revealed

Beluga whales, notoriously difficult to study due to their Arctic habitat, are shedding light on their social lives through a decade-long DNA analysis. The study focused on a population of belugas in Bristol Bay, Alaska, over a 13-year period, involving researchers and Alaska Native subsistence hunters. Initial predictions suggested a polygynous system where a few dominant males sire most offspring, with females potentially having limited mate choice.

However, genetic findings contradicted these expectations. The analysis revealed that both male and female belugas engage in reproduction with various partners across different breeding seasons. This flexible approach, coupled with belugas' long lifespans, appears to be crucial. Despite their small population size of approximately 2,000 individuals, the Bristol Bay belugas display remarkably high genetic diversity and low levels of inbreeding, challenging prior assumptions about population genetics.