Sites - Important Bird and Biodiversity Areas (IBAs)
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South Africa, Western Cape
18o 18.00' East 32o 5.00' South
A1, A4i, A4ii, A4iii
0 - 8m
Year of IBA assessment
BirdLife South Africa
Summary Situated on the Atlantic coast, c. 150 km north of Cape Town, this small island lies in Lambert's Bay harbour extremely close to shore. A concrete causeway that forms the fishing harbour has linked the island to the mainland since 1959. Rising to only 7.6 m above sea level, the island is rocky and virtually devoid of vegetation.
Site description Situated on the Atlantic coast, c.150 km north of Cape Town, this small island lies in Lambert’s Bay harbour, extremely close to shore. A concrete causeway that forms the fishing harbour has linked the island to the mainland since 1959. Rising to only 7.6 m, the island is rocky and virtually devoid of vegetation.
Key Biodiversity See Box for key species. Historically this island was dominated by Spheniscus demersus and was devoid of breeding Morus capensis. It would appear that the gannets only colonized this island in 1912; today, it is one of only six localities where they breed. The birds form a single undivided colony in the centre of the island. Breeding numbers have fluctuated dramatically; the population declined steadily between 1956 and 1967, but by 1971 it had recovered, and by 1981 it was 50% larger than it had been in 1971. Numbers of breeding birds have continued to increase since the early 1980s. Phalacrocorax capensis have also nested extensively on the island, occasionally reaching numbers of 61,000 birds. Numbers of Spheniscus demersus halved between the late 1970s and early 1990s, and have subsequently dwindled to a handful of breeding birds. Phalacrocorax coronatus, Larus dominicanus and, occasionally, Sterna bergii breed on the outlying rocks. Phalacrocorax neglectus ceased breeding in 1997, and now only a few roost on the island. Larus hartlaubii and various species of tern roost in large numbers.
Non-bird biodiversity: None known to BirdLife International.
References Adams (1991), Branch (1991), Broekhuysen et al. (1961), Brooke and Prins (1986), Brooke et al. (1982), Cooper (1981), Cooper and Berruti (1989), Cooper and Brooke (1986), Cooper et al. (1983, 1984), Crawford (1995), Crawford and Dyer (1995), Crawford and Shelton (1978, 1981), Crawford et al. (1982a,b, 1983, 1989, 1990, 1994, 1995c), Frost et al. (1976), Furness and Cooper (1982), Hockey (1983), Hockey and Hallinan (1981), Jarvis (1971), Jarvis and Cram (1971), Morant et al. (1981), Randall et al. (1980), Shelton et al. (1982), Siegfried (1982), Summers and Cooper (1977), Williams (1995), Wilson et al. (1988).
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BirdLife International (2015) Important Bird Areas factsheet: Bird Island. Downloaded from
http://www.birdlife.org on 29/08/2015
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