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Location United Kingdom, Channel Islands
Central coordinates 2o 17.50' West  49o 43.45' North
IBA criteria B2
Area 1 ha
Altitude 0 - 24m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description A Cambrian sandstone rock located 4.5 km off the west coast of Alderney. The site supports the smaller of two gannetries in the Channel Islands.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Gannet Morus bassanus breeding  1998-2000  2,500 breeding pairs  good  B2  Least Concern 

IBA Monitoring

2007 low favourable high
Good - based on reliable and complete / representative data

No known threats no known threats happening now small area/few individuals (<10%) no or imperceptible deterioration low

Morus bassanus Northern Gannet 2100 2500 breeding pairs 100 favourable

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  The conservation measures needed for the site are being comprehensively and effectively implemented  high 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Alderney West Coast and the Burhou Islands Wetlands of International Importance (Ramsar) 15,629 protected area contains site 1  


IUCN habitat Habitat detail Extent (% of site)
Coastline Rock stacks and islets  100%

Land use

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

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Ortac, Alderney. Downloaded from on 26/10/2016

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