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Grizzly bear saliva collection research project update

November 12, 2016 by John L. Dengler

Rachel Wheat, a graduate student at the University of California Santa Cruz, takes a bear saliva DNA sample from a partially consumed salmon on the banks of the man-made spawning channel of Herman Creek, near Haines, Alaska. Wheat is collecting DNA samples of bears from bear saliva left on salmon carcasses as part of research for her doctoral dissertation. She hopes to determine if partially-consumed salmon carcasses can serve as a viable source for bear DNA to genotype individuals. She also looking to determine a minimum population estimate for the number of bears using the Chilkoot Valley and the ratio of males to females, particularly in light of increase human presence. The bear DNA collection is part of her dissertation which looks at how the availability of salmon affects eagle movement, bear activity, and subsistence fishermen. EDITORS NOTE: Images of Wheat capturing bald eagles for the bald eagle portion of her study are available here: http://denglerimages.photoshelter.com/gallery/Bald-eagle-research-Chilkat-River-eagle-migration-study/G0000GTyPvah7eiQ/ During late fall, bald eagles congregate along the Chilkat River to feed on salmon. This gathering of bald eagles in the Alaska Chilkat Bald Eagle Preserve is believed to be one of the largest gatherings of bald eagles in the world. (© John L. Dengler/Dengler Images)

Remember when I photographed the ecologist collecting grizzly bear saliva DNA left on partially-consumed salmon carcasses? Well, Dr. Rachel Wheat recently had her findings from that research project published. Wheat’s research found collecting salivary environmental DNA (eDNA) in this noninvasive manner is effective in results, time in the field and cost over other methods like having to trap a bear. Wheat believes this research will be useful in studying population densities, movement and feeding behavior.

Photo Gallery

Images of Wheat collecting bear saliva for DNA

The research and methodology is interesting. Read her paper, Environmental DNA from Residual Saliva for Efficient Noninvasive Genetic Monitoring of Brown Bears (Ursus arctos) for details.

If you missed it, check out my original blog post and photos of her project, Collecting DNA samples from grizzly bear saliva, SAY WHAT?

Congratulations Rachel!

LINKS

  • LEARN MORE — Wheat’s research projects in Haines, Alaska on her blog, Ecology Alaska
  • PHOTO GALLERY — Wheat capturing bald eagles on the Chilkat River in Alaska for migration study

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