Dayyinah Island (Diynah)

IBA Justification

The site was identified as important in 2017 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Socotra Cormorant Phalacrocorax nigrogularis VU breeding 2005-2017 1,600-4,000 breeding pairs A1, A4, B3a
Sooty Gull Larus hemprichii LC breeding 2005-2017 20-35 breeding pairs B2a
Bridled Tern Onychoprion anaethetus LC breeding 2005-2017 6,000 breeding pairs A4, B3a
White-cheeked Tern Sterna repressa LC breeding 2005-2017 1,100-2,600 breeding pairs A4, B2a, B3a
Lesser Crested Tern Thalasseus bengalensis LC breeding 2003-2017 6,000-8,000 breeding pairs A4, B3a
A4iii Species group - waterbirds n/a breeding 2005-2017 14,720-20,635 breeding pairs B3b

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2017).

IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2017 near favourable low negligible
Was the whole site assessed? State assessed by Accuracy of information
yes population medium

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Phalacrocorax nigrogularis Socotra Cormorant 2500 2000 breeding pairs 80 near favourable
Onychoprion anaethetus Bridled Tern 6000 6000 breeding pairs 100 favourable
Sterna repressa White-cheeked Tern 2000 1750 breeding pairs 88 near favourable
Thalasseus bengalensis Lesser Crested Tern 7000 7000 breeding pairs 100 favourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1 Threat level 2 Timing Scope Severity Result
Human intrusions and disturbance recreational activities happening now small area/few individuals (<10%) no or imperceptible deterioration low
Residential and commercial development housing and urban areas past (and unlikely to return) and no longer limiting small area/few individuals (<10%) very rapid to severe deterioration low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Little/none of site covered (<10%) No management planning has taken place Very little or no conservation action taking place negligible
For more information about IBA conservation status, please click here


Habitat (IUCN level 1) Habitat detail Extent (% of site)
Marine Intertidal -
Marine Neritic -
Marine Coastal/Supratidal -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
military -

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Dayyinah Island (Diynah). Downloaded from on 02/10/2023.