IBA Barkley Sound
Ucluelet, British Columbia
Site Summary
BC075 Latitude
Longitude
48.891° N
125.281° W
Elevation
Size
0 m
911.80 km²
Habitats:
coniferous forest (temperate), open sea, inlets/coastal features (marine), coastal cliffs/rocky shores (marine)
Land Use:
Nature conservation and research
Potential or ongoing Threats:
Disturbance, Oil slicks, Recreation/tourism
IBA Criteria: Globally Significant: Threatened Species, Congregatory Species, Waterfowl Concentrations, Nationally Significant: Congregatory Species
Conservation status: Ecological Reserve (provincial), National Park
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Site Description
Barkley Sound is located on the exposed southwestern coastline of Vancouver Island, British Columbia. The town of Ucluelet lies to the north side of the sound and the small village of Bamfield is in an inlet on the southern side. The sound is a prominent topographic feature that has low shores backed by rugged mountains, and is exposed to the open Pacific Ocean. A dominant feature of this site is the Broken Group Islands, a component of Pacific Rim National Park Reserve, which consists of approximately 100 islands and rocks in the central part of the sound. The outermost islands of the sound are fully exposed to the force of the ocean, while in the lee of the outer islands and in the inner part of the sound, there are protected channels and quiet bays. Forests are dominated by Sitka Spruce, Western Hemlock, and Western Red Cedar. Rocky headlands broken by sand or gravel beaches make up most of the shoreline. Northern Sea Lions often frequent the reefs around the islets.
Birds
Barkley Sound hosts six species of birds of global significance and two breeding species of national significance. In 1982, intensive surveys revealed 3,406 Marbled Murrelets in the sound, which is at least 1% of the North American population for this nationally threatened species. However, surveys in 1992-1993 revealed a population decrease of 41% compared to the previous decade. In summer, murrelets congregate in inshore and outer channel habitats, particularly within the islands of the Broken Group and Trevor Channel.

During spring migration, several different bird species congregate at this site. Globally significant numbers of Surf Scoters gather in the sound, with 52,000 recorded in 1989. Mew Gull concentrations reached 3% of their North American population, with 1,542 being recorded in spring migration. In the spring of 1979, a maximum number of Western Grebes (4,900 or 4% of the global population) were documented in the sound. Migrating Surfbirds are seen in very large numbers, reaching a maximum of 4,500 birds, or over 6% of the world population. Large flocks of Surf Scoters, gulls and grebes gather in the sound to feed on spawning herring. Birds are most abundant in areas such as the Macoah Passage where herring spawn is concentrated. In 1989, 74,148 waterbirds were recorded in the sound, further indicating the rich avifauna of the sound.

Most of the Canadian Brandt's Cormorants breed in Barkley Sound. In 1982 there were 51 pairs, a decline from a high of 150 pairs in 1970 that bred in six locations along the west coast of Vancouver Island. Brandt's Cormorants also stage in the sound in late summer, with peaks of 1,200 birds (mostly coming from outside Canada), which is more than 1% of the global population. Other breeding birds include 42 pairs of Black Oystercatchers (4% of the Canadian population) nesting on 13 islets, and 728 pairs Glaucous-winged Gull (almost 3% of the Canadian population).




IBA Criteria
SpeciesT | A | I Links Date Season Number G C N
Black Oystercatcher 1985 SU 84
Black Oystercatcher 2006 - 2015 WI 76 - 87
Black-footed Albatross 2012 FA 24
Black-footed Albatross 1993 SP 25
Heermann's Gull 1996 - 2012 FA 25 - 85
Heermann's Gull 2015 SU 24
Iceland Gull (Thayer's) 2005 FA 107
Iceland Gull (Thayer's) 2005 SP 95
Iceland Gull (Thayer's) 1991 - 2015 WI 86 - 186
Marbled Murrelet 1982 SU 3,406
Pelagic Cormorant 2006 WI 829
Pink-footed Shearwater 2001 - 2012 FA 75 - 700
Pink-footed Shearwater 2011 SU 40
Surf Scoter 1989 - 1991 SP 12,000 - 52,000
Surfbird 1985 - 1993 SP 900 - 4,500
Western Grebe 1979 - 2005 SP 963 - 4,900
Western Grebe 2005 WI 963
Note: species shown in bold indicate that the maximum number exceeds at least one of the IBA thresholds (sub-regional, regional or global). The site may still not qualify for that level of IBA if the maximum number reflects an exceptional or historical occurrence.
 
Conservation Issues
Oil spills, and disturbance from boaters and other visitors are potential problems. A portion of the proposed site, protected as a component of Pacific Rim National Park is in relatively protected and accessible waters. Since it is close to Ucluelet and Bamfield and is a popular destination for tourists and vacationers, recreational boat traffic and kayakers could be a source of disturbance to flocks of seaducks and other avifauna. Some people approach too closely and/or land on the islands during the breeding season and thus disturbing seabirds. The decline in Marbled Murrelet numbers may be because of a loss of old-growth forest nesting habitat, but other possible factors are oil spills, gill-net fishing or oceanographic changes.

The IBA Program is an international conservation initiative coordinated by BirdLife International. The Canadian co-partners for the IBA Program are Bird Studies Canada and Nature Canada.
   © Bird Studies Canada