A new report, just published in Nature Ecology & Evolution, finds that inbreeding within the critically endangered Southern Resident killer whale population is straining the population. FOX13
The concern for the iconic orcas is not new, though the latest scientific findings add yet another concerning layer for those hoping to see the Southern Residents avoid extinction.
Each new birth within the Southern Resident killer whale population is met with fanfare, and for good reason. The famed Southern Residents have been listed as an endangered species in both the U.S. and Canada. Their numbers were nearing 100 a few decades ago – lately the total population has hovered in the mid-70s.
In the group’s conclusion, they write: "Our results suggest that the Southern Resident killer whale population growth rate would be substantially higher if its average level of inbreeding was similar to other North Pacific killer whale populations." According to the authors, a female killer whale takes about 20 years to reach peak fertility – inbred individuals are less likely to reach that age, meaning the population has less of a chance to expand.
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