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Location South Africa, Western Cape
Central coordinates 18o 5.00' East  33o 25.00' South
IBA criteria A1, A4i, A4ii, A4iii
Area 273 ha
Altitude 0 - 19m
Year of IBA assessment 2001

BirdLife South Africa



Summary Dassen Island, South Africa's second largest coastal island lies 9 km from the mainland between Saldanha Bay and Cape Town. This island reaches 19.2 m above sea level at its highest point. Owing to its proximity to the mainland and offers sanctuary to a variety of land and seabirds. The most important resident is the African Penguin Spheniscus demersus.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
African Penguin Spheniscus demersus resident  8,000-9,000 breeding pairs  A1, A4ii  Endangered 
African Penguin Spheniscus demersus winter  30,000 individuals  A1, A4ii  Endangered 
Cape Cormorant Phalacrocorax capensis resident  13,767-48,000 breeding pairs  A1, A4i  Endangered 
Cape Cormorant Phalacrocorax capensis winter  30,000-100,000 individuals  A1, A4i  Endangered 
Bank Cormorant Phalacrocorax neglectus resident  30-50 breeding pairs  A1  Endangered 
Bank Cormorant Phalacrocorax neglectus winter  50-200 individuals  A1, A4i  Endangered 
Crowned Cormorant Microcarbo coronatus resident  80-175 breeding pairs  A1, A4i  Near Threatened 
Crowned Cormorant Microcarbo coronatus winter  400 individuals  A1, A4i  Near Threatened 
African Oystercatcher Haematopus moquini resident  100 breeding pairs  A1, A4i  Near Threatened 
African Oystercatcher Haematopus moquini winter  221-436 individuals  A1, A4i  Near Threatened 
Ruddy Turnstone Arenaria interpres winter  416 individuals  A4i  Least Concern 
Kelp Gull Larus dominicanus breeding  5,000-7,500 breeding pairs  A4i  Least Concern 
Kelp Gull Larus dominicanus winter  12,000-18,000 individuals  A4i  Least Concern 
Hartlaub's Gull Larus hartlaubii breeding  30-100 breeding pairs  A4i  Least Concern 
Hartlaub's Gull Larus hartlaubii winter  250 individuals  A4i  Least Concern 
Greater Crested Tern Thalasseus bergii breeding  3,038 breeding pairs  A4i  Least Concern 
Greater Crested Tern Thalasseus bergii winter  400-7,000 individuals  A4i  Least Concern 
A4iii Species group - seabirds winter  50,000-99,999 individuals  unknown  A4iii   
A4iii Species group - seabirds resident  100,000-499,999 individuals  unknown  A4iii   
A4iii Species group - waterbirds breeding  20,000-49,999 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Cape West Coast UNESCO-MAB Biosphere Reserve 378,240 protected area contains site 273  
Dassen Island Other Area 257 protected area contains site 273  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Unknown   -
Coastline Sand dunes & beaches; Scree, boulders and bare rock; Sea cliffs & rocky shores; Shingle & stony beaches  major
Rocky areas   major

Land use

Land-use Extent (% of site)
unknown -
unknown -

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Dassen Island. Downloaded from http://www.birdlife.org on 01/10/2014

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