ZA088
Dassen Island


IBA Criteria

Year of most recent IBA criteria assessment: 1998

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
African Penguin Spheniscus demersus EN resident - 8,000-9,000 breeding pairs A1, A4ii
African Penguin Spheniscus demersus EN non-breeding - 30,000 individuals A1, A4ii
Crowned Cormorant Microcarbo coronatus NT resident - 80-175 breeding pairs A1, A4i
Crowned Cormorant Microcarbo coronatus NT non-breeding - 400 individuals A1, A4i
Cape Cormorant Phalacrocorax capensis EN resident - 13,767-48,000 breeding pairs A1, A4i
Cape Cormorant Phalacrocorax capensis EN non-breeding - 30,000-100,000 individuals A1, A4i
Bank Cormorant Phalacrocorax neglectus EN resident - 30-50 breeding pairs A1
Bank Cormorant Phalacrocorax neglectus EN non-breeding - 50-200 individuals A1, A4i
African Oystercatcher Haematopus moquini LC resident - 100 breeding pairs A1, A4i
African Oystercatcher Haematopus moquini LC non-breeding - 221-436 individuals A1, A4i
Ruddy Turnstone Arenaria interpres LC winter - 416 individuals A4i
Hartlaub's Gull Larus hartlaubii LC breeding - 30-100 breeding pairs A4i
Hartlaub's Gull Larus hartlaubii LC non-breeding - 250 individuals A4i
Kelp Gull Larus dominicanus LC breeding - 5,000-7,500 breeding pairs A4i
Kelp Gull Larus dominicanus LC non-breeding - 12,000-18,000 individuals A4i
Greater Crested Tern Thalasseus bergii LC breeding - 3,038 breeding pairs A4i
Greater Crested Tern Thalasseus bergii LC non-breeding - 400-7,000 individuals A4i
A4iii Species group - seabirds n/a non-breeding - 50,000-99,999 individuals A4iii
A4iii Species group - seabirds n/a resident - 100,000-499,999 individuals A4iii
A4iii Species group - waterbirds n/a breeding - 20,000-49,999 individuals A4iii

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here


IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2013 high favourable high
Was the whole site covered? Yes State assessed by Habitat
Accuracy of information medium

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Biological resource use fishing & harvesting aquatic resources - unintentional effects: large scale happening now majority/most of area/population (50-90%) slow but significant deterioration high
Biological resource use fishing & harvesting aquatic resources - unintentional effects: subsistence/small scale happening now some of area/population (10-49%) slow but significant deterioration medium
Biological resource use hunting & collecting terrestrial animals - unintentional effects (species is not the target) happening now small area/few individuals (<10%) no or imperceptible deterioration low
Climate change and severe weather habitat shifting and alteration happening now some of area/population (10-49%) slow but significant deterioration medium
Climate change and severe weather storms and floods happening now some of area/population (10-49%) slow but significant deterioration medium
Energy production and mining renewable energy likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance work and other activities happening now small area/few individuals (<10%) no or imperceptible deterioration low
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now small area/few individuals (<10%) no or imperceptible deterioration low
Invasive and other problematic species and genes problematic native species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications other ecosystem modifications happening now small area/few individuals (<10%) slow but significant deterioration low
Pollution garbage & solid waste happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution industrial & military effluents - oil spills likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Residential and commercial development housing and urban areas happening now small area/few individuals (<10%) no or imperceptible deterioration low
Transportation and service corridors flight paths happening now some of area/population (10-49%) slow but significant deterioration medium
Transportation and service corridors shipping lanes happening now some of area/population (10-49%) moderate to rapid deterioration high
Transportation and service corridors utility & service lines happening now small area/few individuals (<10%) no or imperceptible deterioration low

Condition of habitat (state)
Habitat Habitat Detail Reference Area (ha) Actual Area (ha) % of habitat remaining % of carrying capacity (overall) Result
Rocky areas (eg. inland cliffs, mountain peaks) 0 0 good (> 90%) good (> 90%) favourable

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Spheniscus demersus African Penguin 30000 16000 individuals 54 unfavourable
Hydrobates leucorhous 5 5 breeding pairs 100 favourable
Pelecanus onocrotalus Great White Pelican 550 450 breeding pairs 82 near favourable
Microcarbo coronatus Crowned Cormorant 175 280 breeding pairs 100 favourable
Phalacrocorax capensis Cape Cormorant 13767 765 breeding pairs 6 very unfavourable
Phalacrocorax neglectus Bank Cormorant 50 70 breeding pairs 100 favourable
Haematopus moquini African Oystercatcher 436 280 individuals 65 unfavourable
Larus hartlaubii Hartlaub's Gull 100 1327 breeding pairs 100 favourable
Larus dominicanus Kelp Gull 7500 1739 breeding pairs 24 very unfavourable
Thalasseus bergii Greater Crested Tern 3038 1477 breeding pairs 49 unfavourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity high
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Dassen Island Provincial Nature Reserve Nature Reserve 269 protected area contained by site 273
Cape West Coast Biosphere Reserve UNESCO-MAB Biosphere Reserve 386,161 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 -
Rocky areas (eg. inland cliffs, mountain peaks) -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
unknown -
For further information about the land use classification please click here.


Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Dassen Island. Downloaded from http://www.birdlife.org on 26/10/2021.