Page 534 - Atlas Sea Birds Ver1

Table 2: Estimates of numbers of Greater Crested Terns (pairs) breeding in southern Africa in 1984 (Cooper et al. 1990) and c. 2006
(Kemper et al. 2007) and in South Africa in 2000 and 2008 (Crawford 2009). Also shown are the most recent values for each site, the year
of that observation and its percentage contribution to the total of the most recent values. The quasi-decadal period of the most recent
observations at sites is colour-coded and the percentage contribution of values from different periods to the sum of the most recent values
is indicated. Sites that qualify as IBAs on account of holding ≥ 1% of the most-recent population of the nominate race of the species are
indicated by grey shading. Maxima observed at sites are shown, those ≥ 70 pairs being shaded grey. ‘√’ signifies that breeding occurred
at a site but the numbers were not ascertained; ‘?’ that breeding may have taken place.

% of most recent estimate 1980s 1990s 0.00 2000s 0.59 2010s/20s 99.41
total Maximum
Maximum breeding pairs observed Most Year of % of sum number
recorded
Site Cooper et Crawford Kemper et Crawford recent most of most (pairs) all
al. (1990) (2009) al. (2007) (2009) estimate recent recent years
1984 2000 2006/07 2008 (pairs) estimate estimates
Namibia
Mile 4 Saltworks, 0 2022 0.00 10
Swakopmund
Walvis Bay √ 1986 √
Mercury Island 35 2012 0.38 35
Ichaboe Island 200 6 2022 0.06 1571
Seal Island 445 2022 4.79 546
Penguin Island 125 2022 1.35 125
Shark Island 125 0 2022 0.00 480
Lüderitz harbour 0 2022 0.00 804
Halifax Island 50 1003 808 2014 8.70 1003
Possession Island ? 55 55 2007 0.59 1674
South Africa
Bird Island, Lambert's Bay 0 0 0 2022 0.00 383
Wadrifsoutpan 0 0 0 0 2020 0.00 200
Lower Berg River 2 0 0 0 2020 0.00 101
Saltworks
Sandy Point 10 20 0 0 2020 0.00 750
Malgas Island 0 0 261 0 43 2022 0.46 3308
Marcus Island 3308 0 0 0 2020 0.00 442
Saldanha 442 0 0 2022 0.00 2130
Jutten Island 0 4 7 7 2022 0.08 3012
Meeuw Island 0 0 0 0 2022 0.00 1500
Schaapen Island 0 257 3246 6 2022 0.06 3246
Vondeling Island 0 0 0 0 2022 0.00 80
Caspian Island 0 0 0 2020 0.00 530
Dassen Island 0 4192 35 247 2022 2.66 4946
Koeberg Nuclear Power 0 0 0 2019 0.00 550
Station
Robben Island 1250 0 3 4785 3502 2022 37.69 12986
Cape Town waterfront 987 2021 10.62 4000
Somerset Hospital 0 2020 0.00 50
Strandfontein Sewerage 0 0 0 0 2022 0.00 828
Works
Danger Point Abalone 0 2022 0.00 4680
Farm
Dyer Island 0 763 6722 5162 2307 2022 24.83 6722
Seal Island, Mossel Bay c. 200 pairs bred in 1923, none since 1970 0 2015 0.00 200
Chatty saltpan, Swartkops 219 2022 2.36 479
River
Coega River Estuary 0 2022 0.00 729
Saltworks
Seal Island, Algoa Bay 668 660 0 500 2019 5.38 668
Stag Island 100 0 0 0 2019 0.00 113
Bird Island 0 0 2019 0.00 565
Total Namibia 175 1258 0 1474 15.86 6248
Total South Africa 4660 6336 7666 13235 7818 84.14 53198
Total overall 4835 8924 9292 100.00 59446

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