"Eve" and descendants shape global sperm whale population structure
Although sperm whales have not been driven to the brink of extinction as have some other whales, a new study has found a remarkable lack of diversity in the maternally inherited mitochondrial DNA within the species.
In fact, the mitochondrial DNA from more than a thousand sperm whales examined during the past 15 years came from a single “Eve” sperm whale tens of thousands of years ago, the researchers say.
Results of the study are being published this week in the journal Molecular Ecology.
While the exact origins of this sperm whale “Eve” remain uncertain, the study shows the importance of her female descendants in shaping global population structure, according to Alana Alexander, a University of Kansas Biodiversity Institute researcher who conducted the study while a doctoral student at Oregon State University.
“Although the male sperm whale is more famous in literature and cinema through ‘Moby Dick’ and ‘In the Heart of the Sea,’ the patterns in mitochondrial DNA show that female sperm whales are shaping genetic differentiation by sticking close to home,” Alexander said.