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Location United Kingdom, Scotland
Central coordinates 6o 25.23' West  56o 29.50' North
IBA criteria A4ii, A4iii, B1ii, B2, B3, C2, C4, C6
Area 239 ha
Altitude 0 - 103m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description A string of rocky islands and skerries with cliffs and screes, but each with its own character. There is a strong maritime influence on the grassland and heathland vegetation communities. The islands are important for breeding seabirds. Branta leucopsis are from the Greenland breeding population.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
European Storm-petrel Hydrobates pelagicus breeding  1996  5,050 breeding pairs  good  A4ii, B1ii, B2, C2, C6  Least Concern 
European Shag Phalacrocorax aristotelis breeding  1999  601 breeding pairs  good  B3  Least Concern 
Great Black-backed Gull Larus marinus breeding  1999  342 breeding pairs  good  B3  Least Concern 
A4iii Species group - seabirds breeding  1996-2000  16,580 breeding pairs  good  A4iii, C4   

IBA Monitoring

2007 medium very unfavourable medium
Good - based on reliable and complete / representative data

Agriculture and aquaculture livestock farming and ranching (includes forest grazing) - small-holder grazing, ranching or farming happening now some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) slow but significant deterioration medium

Branta leucopsis Barnacle Goose 565 20 individuals 4 very unfavourable
Phalacrocorax aristotelis European Shag 105 601 breeding pairs 100 favourable
Larus marinus Great Black-backed Gull 265 342 breeding pairs 100 favourable
Species group - seabirds A4iii 16913 16580 breeding pairs 99 favourable

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Treshnish Isles Site of Special Scientific Interest 208 is identical to site 208  


IUCN habitat Habitat detail Extent (% of site)
Shrubland Heathland  -
Grassland   -
Coastline Scree and boulders; Sea cliffs and rocky shores  -

Land use

Land-use Extent (% of site)
not utilised 100%

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Treshnish Isles. Downloaded from on 20/10/2016

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