Breeding data were collected in most years through the RBBP and local staff of both SNH (formerly NCC) and the RSPB. From 1992 onwards visits to find nest sites on Shetland were more frequent and included colour-ringing of young.
The likelihood that phalaropes were breeding is grouped into three categories:
Records are given here at 100m resolution, which represents the centroid of the site. Where the exact site is unknown, 1km or 10km resolution grid references are used.
These data have been gathered by trained field-workers and the data are of a high quality. These data have been mapped and checked for sensitivities and typographical/geographical errors.