R. Cuthbert in litt. (2007) gave current population estimates of 32,000-65,000 breeding pairs at Gough, 18-27,000 at Inaccessible and 3,200-4,500 at Tristan. Nightingale and Middle Islands were estimated to support 125,000 pairs in the 1970s, but recent observations suggest that the main colony on Nightingale has decreased in size. Jouventin et al (2006) detail the following: Amsterdam Island 25,000 pairs, St Paul Island 9,000 pairs (both 1993 counts).
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