Page 546 - Atlas Sea Birds Ver1

Table 2: Estimates of numbers of Caspian Terns (pairs) breeding in southern Africa in Cooper et al. (1992), Kemper et al. (2007) and
AEWA (2015). Also shown are maxima observed at coastal sites from 2018–2022 and in five decadal or quasi-decadal periods and the
most recent value for each site, the year of that observation, and its percentage contribution to the total of the most recent values. The
decade of observation is colour-coded and the percentage contribution of values from different decades to the sum of the most recent
values is indicated. Numbers at subsites of Swartkops River and Lake St Lucia are shown in red and summed under those sites. Sites
that qualify as IBAs are highlighted in grey. Note that numbers breeding at inland sites were not available after 1990
Decade of most recent 1970s 1980s 1990s 2000s 2010s/20s IBA on basis of ≥ 10 pairs
estimate
Maximum breeding pairs observed % of sum of most recent estimates from different
decades
Cooper Kemper Most Year of % of sum 60s/70s 1980s 1990s 2000s 10s/20s
This
Site et al. et al. AEWA study recent most of most 1.26 0.00 0.00 41.06 57.68
recent
recent
(1992) (2007) (2015) estimate estimate estimates Maximum observed pairs in different decades
(pairs)
1980- 1995- 2018-
1970s 1980s 1990s 2000s 2010s
1991 2006 2022
Coastal sites
Angola
Ilha dos Tigres 88 88 88 2005 22.17 88
Namibia
Mile 4 Saltworks, 40 18 18 51 1 2021 0.25 35 40 51
Swakopmund
Pelican Point 4 1964 1.01
Walvis Bay sewage works 2 2 2 2014 0.50 6 2
Walvis Bay Saltworks 75 2004 18.89 48
Sandwich Harbour 1 1 1 1977 0.25 1
Seal Island 1 1 2022 0.25 1
Penguin Island 1 1 2022 0.25 1
Possession Island 4 2 2022 0.50 4
South Africa
Orange River estuary 12 0 0 2018 0.00 12 0
Alexander Bay sewage 2 0 0 2019 0.00 2 0
works
Tweepad (Slimes Dam) 1 1 0 2019 0.00 1 1
Velddrif saltworks 17 17 2017 4.28 51 85
Lower Berg River 32 69 55 21 2020 5.29 15 32 30 0 55
Malgas Island 1 0 2020 0.00 1
Marcus Island 0 0 2020 0.00 1 0
Jutten Island 1 2 1 1 0 2020 0.00 1 1 2
Meeuw Island 1 1 1 0 2020 0.00 2 1 1
Schaapen Island 5 1 1 2 1 2020 0.25 20 5 1 2
Vondeling Island 0 0 2019 0.00 1 0
Caspian Island 5 12 10 8 2018 2.02 5 15 25 15
Die Skeiding, Yzerfontein 0 0 2021 0.00 1
Dassen Island 0 0 2021 0.00 0 1
Robben Island 1 1 0 2019 0.00 0 1
Strandfontein Sewerage 1 0 0 2020 0.00 1 0
Works
Dyer Island 1 15 15 2020 3.78 1 4 0
Die Dam 12 0 0 2019 0.00 12 21
Heuningnes River, De
Mond 35 0 0 2018 0.00 2 35 5
De Hoop Vlei 0 0 2018 0.00 4
Knysna Lagoon 2 2004 0.50
Keurbooms River estuary 2 3 1 1 2021 0.25 2 2 3
Swartkops River Saltpans 52 18 0 0 2021 0.00 58 50 47 42
Bar None Saltpans 0 0 2021 40
Chatty Saltpans 0 0 2021 47

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