Raptor pellets are regularly encountered in the field in a variety of habitats. Where multiple species of similar-sized raptors are sympatric, there can be uncertainty about which species produced a pellet based on visual assessments alone. We developed a DNA barcoding protocol that used environmental DNA (eDNA) to identify birds of prey that had produced pellets. Two different PCR primer pairs were required to successfully ascribe a pellet to the source bird species. Troubleshooting different suspension temperatures and applying multiple primer sets to the same eDNA sample provided sequences that successfully identified Red-tailed Hawk (Buteo jamaicensis) and Great Horned Owl (Bubo virginianus) pellets. Because eDNA degrades, this protocol will only work on pellets that have been in the environment for a limited time, probably <6 months.
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6 April 2022
Using eDNA to confirm the identity of raptors that cast pellets
Mika H. Kirkhus,
Rielle Hoeg,
Dave Shutler,
Allison K. Walker
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COI gene
degradation
DNA barcoding
great horned owl
red-tailed hawk