Purpose is to provide a stable, long-term home for Evening Grosbeak research over a broad front: field observations, recordings, assortative mating and call type delineation by sound, range and DNA. Provide information to the scientific community on the validity of call types and potential full-species separations for flight call types. One purpose would be to serve as arbiters of flight call determination via audiospectrographic analysis for this North American species.
Object of study: assortative mating, morphometrics, flight call variations and genetics for all call types, but especially with Type 1 which overlaps with all the other call types to some degree.
Submit your sightings to eBird (including type and audio) to help answer some nagging questions:
- To what extent will Type 1’s irrupt from year to year? Distance? Quantity?
- Are the types geographically isolated during the breeding season?
- Do they overlap in parts of their range but only breed with the same type?
- What other, more complex things may be happening on the breeding and wintering grounds?
- Do Types form mixed flocks during the winter
Also see: Tracking Irruptive Movements of Wintering Evening Grosbeaks (Coccothraustes vespertinus) from Western Pennsylvania
Go to species account: LINK
If you would like to know more about or want to contribute to this project, please get in touch with Matt