Breeding population size estimate for United Kingdom converted to specified units (breeding females) assuming a 1:1 ratio.

Long-term breeding population trend direction for Poland misentered; should be increasing (T. Chodkiewicz in litt., November 2014).

In the absence of a report from Greece for this taxon, surrogate data were provided by the Hellenic Ornithological Society (HOS), the BirdLife Partner in Greece, indicating a breeding population of 50–100 breeding females, with a decreasing trend (5–30%) during 2001–2012 and an unknown trend during 1980–2012.