How has hybridization affected the endangered spotted owl in Washington State?

Hybridization has significantly impacted the endangered spotted owl population in Washington State, primarily through the competition and genetic mixing with barred owls. Barred owls are a non-native species that have expanded their range into the habitats of spotted owls. This invasion has resulted in increased competition for food and nesting sites, which are critical for the survival of the spotted owl.

As barred owls occupy similar ecological niches, they not only compete directly with spotted owls but also hybridize with them. This hybridization can reduce the genetic fitness of the spotted owl population, leading to fewer purebred individuals over time. The resultant loss of genetic integrity threatens the distinct characteristics of the spotted owl, further contributing to its decline.

Thus, the hybridization, coupled with competition from barred owls, exacerbates the already challenging situation for the endangered spotted owl, making it a significant ecological concern within the region.