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Location South Africa, Western Cape
Central coordinates 19o 25.00' East  34o 41.00' South
IBA criteria A1, A4i, A4ii, A4iii
Area 20 ha
Altitude 0 - 9m
Year of IBA assessment 2001

BirdLife South Africa



Site description Dyer Island is one of two low-lying islands situated 4.7 km south-east of Danger Point. The nearest harbour is at Kleinbaai/Franskraal, just south of Gansbaai. The coastline is rugged with some low rocky areas spreading inland. The island is flat and low-lying, with a pebbly surface. The vegetation consists primarily of Mesembryanthemaceae and non-native weeds (including conspicuous stands of Lavatera). In the south-eastern part of the island are several buildings that house the island staff, boats and stores.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Jackass Penguin Spheniscus demersus resident  3,050 breeding pairs  A1, A4ii  Endangered 
Jackass Penguin Spheniscus demersus winter  9,000 individuals  A1, A4ii  Endangered 
Cape Cormorant Phalacrocorax capensis resident  35,580 breeding pairs  A1, A4i  Endangered 
Cape Cormorant Phalacrocorax capensis winter  100,000 individuals  A1, A4i  Endangered 
Bank Cormorant Phalacrocorax neglectus breeding  uncommon  A1  Endangered 
Crowned Cormorant Microcarbo coronatus resident  60-238 breeding pairs  A1, A4i  Near Threatened 
Crowned Cormorant Microcarbo coronatus winter  150-500 individuals  A1, A4i  Near Threatened 
African Oystercatcher Haematopus moquini resident  2000  27-67 breeding pairs  unknown  A1, A4i  Near Threatened 
African Oystercatcher Haematopus moquini winter  160 individuals  A1, A4i  Near Threatened 
Kelp Gull Larus dominicanus breeding  88-130 breeding pairs  A4i  Least Concern 
Kelp Gull Larus dominicanus winter  200-500 individuals  A4i  Least Concern 
Hartlaub's Gull Larus hartlaubii breeding  110 breeding pairs  A4i  Least Concern 
Hartlaub's Gull Larus hartlaubii winter  280 individuals  A4i  Least Concern 
Greater Crested Tern Thalasseus bergii breeding  300 breeding pairs  A4i  Least Concern 
Greater Crested Tern Thalasseus bergii winter  750 individuals  A4i  Least Concern 
A4iii Species group - seabirds resident  100,000-499,999 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Dyer Island Other Area 16 protected area contains site 20  

Local conservation groups The local conservation group below is working to support conservation at this IBA.

Name Year formed
Dyer Island Conservation Trust 0

Habitats

IUCN habitat Habitat detail Extent (% of site)
Unknown   -
Coastline   major
Other   major

Land use

Land-use Extent (% of site)
nature conservation and research 100%
tourism/recreation -
urban/industrial/transport -

Other biodiversity The waters around the island hold a large population of the shark Carcharodon carcharias (VU).

References Adams (1991), Branch (1991), Brooke and Prins (1986), 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), Morant et al. (1981), Rand (1963), Randall and Randall (1980), Randall et al. (1980), Shelton et al. (1982), Siegfried (1982), Summers and Cooper (1977), Whittington (1996), Whittington and Dyer (1995), Whittington et al. (1998), Williams et al. (1990), Wilson et al. (1988).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Dyer Island Nature Reserve. Downloaded from http://www.birdlife.org on 02/08/2014

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