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Barkley Sound (BC075)

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Barkley Sound (BC075)

Ucluelet, British Columbia

Latitude 48.891°N
Longitude 125.281°W
Altitude 0m
Area 911.80km²

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).

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.

IBA Criteria Habitats Land Uses Potential or Ongoing Threats Conservation Status
Pink-footed Shearwater
Number Year Season
7002012Fall
402011Summer
752001Fall
Surf Scoter
Number Year Season
15,0001991Spring
12,0001990Spring
52,0001989Spring
Surfbird
Number Year Season
9001993Spring
1,5001990Spring
4,5001985Spring
Western Grebe
Number Year Season
9632005Spring
9632005Winter
4,9001979Spring
Iceland Gull (Thayer's)
Number Year Season
972015Winter
1862010Winter
1752006Winter
86 - 952005Winter
1072005Fall
952005Spring
109 - 1211991Winter
Pelagic Cormorant
Number Year Season
8292006Winter
??Summer
Marbled Murrelet
Number Year Season
3,4061982Summer
Black-footed Albatross
Number Year Season
242012Fall
251993Spring
Heermann's Gull
Number Year Season
242015Summer
352012Fall
252009Fall
602003Fall
852000Fall
501996Fall
Black Oystercatcher
Number Year Season
762015Winter
872006Winter
841985Summer