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The site was identified as important in 2007 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
European Storm-petrel Hydrobates pelagicus	LC	breeding	1996	5,050 breeding pairs	A4ii, B1ii, B2, C2, C6
European Shag Gulosus aristotelis	LC	breeding	1999	601 breeding pairs	B3
Great Black-backed Gull Larus marinus	LC	breeding	1999	342 breeding pairs	B3
A4iii Species group - seabirds	n/a	breeding	1996-2000	16,580 breeding pairs	A4iii, C4

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2007) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2007) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Barnacle Goose Branta leucopsis	565	20	individuals	4	very unfavourable
European Shag Gulosus aristotelis	105	601	breeding pairs	100	favourable
Great Black-backed Gull Larus marinus	265	342	breeding pairs	100	favourable
A4iii Species group - seabirds	16,913	16,580	breeding pairs	99	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	happening now	some of area/population (10-49%)	slow but significant deterioration	medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
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90%) covered by appropriate conservation designation	A management plan exists but it is out of date or not comprehensive	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	medium

Year	Protected Area	Designation	% overlap with IBA
1962	Treshnish Isles	Site of Special Scientific Interest (UK)	87
1980	Loch na Keal, Isle of Mull	National Scenic Area	100
1995	Treshnish Isles	Special Protection Area (Birds Directive)	100
2001	Treshnish Isles	Site of Community Importance (Habitats Directive)	82
2005	Treshnish Isles	Marine Protected Area (OSPAR)	42
2017	Inner Hebrides and the Minches	Site of Community Importance (Habitats Directive)	3

Habitat1	Habitat detail	% of IBA
Grassland		-
Marine Coastal/Supratidal		-
Shrubland	Heathland	-

1. IUCN Habitat classification.

Land use	% of IBA
not utilised	100

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Treshnish Isles (United Kingdom). Downloaded from https://datazone.birdlife.org/site/factsheet/treshnish-isles-iba-united-kingdom on 23/11/2024.