This report - https://caff.is/monitoring-series/all-monitoring-documents/456-a-global-audit-of-the-status-and-trends-of-arctic-and-northern-hemisphere-goose - just published was led by Tony Fox and Jim Leafloor and collates information from lots of people (we contributed for ECHA Brent) about goose population across the northern hemisphere. Lots of evening reading for you all there.
This is what it says on the Conservation of Arctic Flora and Fauna (CAFF) website:
"This report attempts to review the abundance, status and distribution of wild goose populations in the northern hemisphere. The report comprises three parts that 10 summarise key findings from the study and the methodology and analysis applied; 2) contain the individual species accounts for each of the 68 populations included in the report; and 3) provide the datasets compiled fo this study which will be accessible on the Arctic biodiversity Data Service." [Note that at the time of this posting the report has temporarily been removed from the CAFF website while a few edits are made]