FiRN is dedicated to the study and conservation of finches and their habitats globally. The Evening Grosbeak has declined 92% since 1970 and is listed as a species of conservation concern!
Purpose is to look at reasons for the decline, and to provide a stable, long-term home for Evening Grosbeak research over a broad front: population declines, 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: Look into population declines, 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