email a friend
printable version
Location Canada, British Columbia
Central coordinates 131o 12.67' West  52o 4.85' North
IBA criteria A4ii, A4iii
Area 11,000 ha
Altitude 0 - 75m
Year of IBA assessment 2008

Bird Studies Canada/Nature Canada

Site description The Anthony Island Important Bird Area is located off the southwest coast of Moresby Island, west of Kunghit Island in the Queen Charlotte Islands. It is centered around Anthony Island and its associated offshore islets and extends out to include a marine area of 5 km radius, from Cape Freeman on the west coast of Moresby Island, to Tuga and Etches Point within Louscoone Inlet, then across the western entrance of Houston Stewart Channel to Arnold and Bowles points on Kunghit Island. Also lying within this area are Louscoone Rocks, Adam Rocks, Flatrock Island, and Gordon Islands.

Anthony Island is forested with a typical mix of Sitka Spruce, Western Hemlock, and Western Red Cedar. Spruce is more predominant near the shore, and hemlock and cedar are more abundant inland. The forest understory is generally bare litter with some moss. Grass occurs along shoreline knolls and ridges, and scattered shrubs grow in patches throughout the island. Most of the shoreline of the island is rocky and cliff-bound. The islets range from bare rock, or rock with patches of grass and forbes, to forested islets with an understory varying from grasses to patchy or continuous dense shrubs. Gordon Islands, to the east of Anthony Island, are a series of rugged, dissected rocky knolls, covered with dense salal under a sparse spruce forest. Flatrock Island, Adam Rocks, and Louscoone Rocks are rocky with patches of grasses and forbes.

Key Biodiversity Surveys completed within the Anthony Island complex in the mid-1980's recorded globally significant numbers of both Cassin's Auklets (1.4% of the estimated global and 1.9% of the estimated national population), and Rhinoceros Auklets (2.2% of the estimated global and 3.8% of the estimated national population). An additional five seabird species are present in nationally significant numbers. The small offshore islets collectively support just over 1% of both the estimated Canadian Fork-tailed Storm-Petrel population, and the estimated western Canada Leach's Storm-Petrel population. Nationally significant numbers of Pigeon Guillemots (4.6% of the estimated Canadian population), Glaucous-winged Gulls (1.9% of the estimated Canadian population) and Black Oystercatchers (1.6% of the estimated Canadian population) nest within this group of islands.

Other species of seabirds nesting on these islands include Pelagic Cormorants, Ancient Murrelets, Tufted Puffins and Horned Puffins (fewer than 25 pairs of Horned Puffins are suspected of nesting in Canada). Peregrine Falcons (ssp. pealei) are recorded in the area and Bald Eagles nest on the Anthony Island complex and Gordon Islands.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Cassin's Auklet Ptychoramphus aleuticus breeding  1985  25,400 breeding pairs  A4ii  Near Threatened 
Rhinoceros Auklet Cerorhinca monocerata breeding  1985  13,771 breeding pairs  A4ii  Least Concern 
A4iii Species group - seabirds breeding  1985  20,000-49,999 breeding pairs  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Gwaii Haanas National Marine Conservation Area Reserve 305,000 protected area overlaps with site 900  
Gwaii Haanas and Haida Heritage Site National Park Reserve 149,500 protected area overlaps with site 1,000  


IUCN habitat Habitat detail Extent (% of site)
Forest Temperate coniferous forest  -
Shrubland Scrub  -

Land use

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

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Anthony Island. Downloaded from on 25/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife