IBA Brier Island and Offshore Waters
Westport, Nova Scotia
Site Summary
NS021 Latitude
Longitude
44.258° N
66.364° W
Elevation
Size
0 - 30 m
924.50 km²
Habitats:
mixed woods (temperate), scrub/shrub, open sea, inlets/coastal features (marine), coastal cliffs/rocky shores (marine)
Land Use:
Nature conservation and research, Fisheries/aquaculture, Tourism/recreation
Potential or ongoing Threats:
Fisheries, Oil slicks, Recreation/tourism
IBA Criteria: Globally Significant: Congregatory Species, Colonial Waterbirds/Seabird Concentrations, Shorebird Concentrations, Migratory Landbird Concentrations, Continentally Significant: Congregatory Species
Conservation status: Bird Banding Station, Nature Conservancy (owned by)
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Site Description
Brier Island is located at the extreme western end of Nova Scotia, and is about 50 km southwest of the town of Digby. The site includes Brier Island plus tiny Peter Island and the surrounding marine waters for at least 15 km offshore. Brier Island is 7 km by 3 km in size, and is separated from the neighbouring Long Island by the 1 km-wide Grand Passage. Most of the island is forested except for the village of Westport and the fields surrounding it. Two parallel ridges run across the island, with lowlands such as bogs and ponds, in-between. The waters of the Bay of Fundy surrounding Brier Island are rich and diverse in marine life. Right, Humpback, Fin and Minke whales, and White-sided Dolphin occur here.
Birds
This island has long been recognized as one of the most important bird areas in the Maritimes, and is considered a mecca for Canadian birders partly due to the diversity of birds that can be seen there. It is a great migration trap for landbirds, and a very important year-round feeding area for marine birds. As of February 2001, 331 species of birds have been recorded in this IBA.

The waters immediately offshore from Brier Island are one of the most important areas for phalaropes in North America. The numbers of mixed flocks of Red-necked and Red phalaropes may regularly number in the millions, although no systematic counts have been made. People frequenting these waters state that 100,000s have been seen annually in August for many years, although researchers seem to be more uncertain about the state of these populations. More specific records include 20,000 Red-necked Phalaropes recorded in 1990, and 10,000 in 1996. In 1984 and 1989, 10,000 and 5,000 Red Phalaropes were reported. Since the global population of Red Phalarope is estimated at 1 million and the North American population of Red-necked Phalarope is estimated at 2.5 million the numbers seen here represent large portions of these species populations. The two phalaropes are often found in tidal streaks, areas where copepods concentrate at the water surface. These feeding areas are associated with underwater ledges found about six and 16 kilometres offshore.

Other marine species seen in large numbers include shearwaters, kittiwakes and alcids. Greater Shearwaters are common in August particularly, with 20,000 recorded in the 1997. Sooty Shearwaters are also common, with smaller and more variable numbers of Manx Shearwater present. Black-legged Kittiwakes are regularly seen in the winter in numbers over 10,000. There is also a record of 40,000 kittiwakes moving past the Northern Point at one point in the 1970s. Thousands of alcids winter in the waters around Brier Island the most common species are Razorbills, Thick-billed Murres, and Dovekie. Numbers of Razorbills are probably significant: 378 were recorded in the winter of 1997/98 on the water, and 8,600 were recorded on passage in 2000.

Banding efforts indicate that the most common landbird migrants in the fall are Yellow-rumped Warbler, Dark-eyed Junco, Golden-crowned Kinglet, White-throated Sparrow, and Magnolia Warbler. Bird banding only occurs over a relatively short period in the fall, but it is thought that if a similar amount of effort were made here as is made in locations such as Long Point in Ontario, the numbers of fall migrants banded might be comparable.

Numbers of migrating raptors are also notable in the autumn. At least 10,000 raptors pass through the area at this time (nationally significant under IBA criteria)., Based on extrapolation, it has been estimated that between 8,000 and 10,000 Sharp-shinned Hawks, and from 3,000 to 4,000 Broad-winged Hawks pass over the area. Peregrine Falcons are also seen frequently.

Flocks of Atlantic Brant pass through the site in continentally significant numbers. For example, 2,000 birds were surveyed in the spring migration of 1997; this represents over 1% of the eastern population. Gulls and terns breed on Peter Island; Roseate Terns used to be part of the colony, but are no longer present.




IBA Criteria
SpeciesT | A | I Number Year Month Day Season A4i/ii B4i/ii/iii A1 B1 C1 Reference
Black-headed Gull 5 2012 7 30 SU 68,500 4 eBird Canada
Black-legged Kittiwake 40,000 1975 1 1 WI 175,000 21,500
Brant 4,000 1995 3 15 SP 5,637 3,517
Dovekie 204 1990 12 18 WI 260,000 10 Christmas Bird Counts
Dovekie 24 1992 12 17 WI 260,000 10 Christmas Bird Counts
Dovekie 52 1993 12 21 WI 260,000 10 Christmas Bird Counts
Dovekie 16 1996 12 27 WI 260,000 10 Christmas Bird Counts
Dovekie 85 2000 12 19 WI 260,000 10 Christmas Bird Counts
Dovekie 501 2002 12 22 WI 260,000 10 Christmas Bird Counts
Dovekie 3,346 2006 12 14 WI 260,000 10 Christmas Bird Counts
Dovekie 9 2015 11 22 FA 260,000 10 eBird Canada
Dovekie 33 2015 11 22 FA 260,000 10 eBird Canada
Great Black-backed Gull 2,000 2002 5 5 SP 6,450 1,800 eBird Canada
Great Cormorant 334 2000 12 19 WI 21,500 320 Christmas Bird Counts
Herring Gull 3,000 2002 5 5 SP 36,715 3,700 eBird Canada
Manx Shearwater 4 1995 9 17 FA 11,500 4 eBird Canada
Manx Shearwater 20 2000 6 2 SU 11,500 4 eBird Canada
Manx Shearwater 4 2012 8 7 FA 11,500 4 eBird Canada
Northern Gannet 2,000 2010 10 9 FA 10,750 1,554 eBird Canada
Purple Sandpiper 271 1997 12 23 WI 2,250 250 Christmas Bird Counts
Razorbill 8,600 2000 WI 15,000 760
Razorbill 8,600 2000 12 19 WI 15,000 760 Christmas Bird Counts
Razorbill 640 2002 12 22 WI 15,000 760 Christmas Bird Counts
Razorbill 8,215 2006 12 14 WI 15,000 760 Christmas Bird Counts
Red Phalarope 20,000 1975 8 1 FA 15,500 12,500 Vickery 1979
Red Phalarope 10,000 1984 FA 15,500 12,500
Red Phalarope 10,000 1984 9 8 FA 15,500 12,500 Forster 1985
Red Phalarope 10,000 2011 9 1 FA 15,500 12,500 eBird Canada
Red Phalarope 20,000 2011 9 3 FA 15,500 12,500 eBird Canada
Red Phalarope 10,000 2012 9 15 FA 15,500 12,500 eBird Canada
Red Phalarope 10,000 2014 7 26 SU 15,500 12,500 eBird Canada
Red Phalarope 40,000 2016 8 4 FA 15,500 12,500 eBird Canada
Red-necked Phalarope 20,000 1990 8 15 FA 40,500 25,000 MacTavish 1991
Sanderling 2,500 2007 9 6 FA 6,600 3,000 Atlantic Canada Shorebird Survey
Savannah Sparrow 85 2002 5 5 SP 800,000 800,000 23 eBird Canada
Savannah Sparrow 50 2011 7 9 SU 800,000 800,000 23 eBird Canada
Savannah Sparrow 30 2014 9 30 FA 800,000 800,000 23 eBird Canada
Semipalmated Plover 1,200 2006 8 3 FA 1,500 1,500 Atlantic Canada Shorebird Survey
Wilson's Storm-Petrel 600 1999 8 7 FA 60,000 750 eBird Canada
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
There are several whale-watching and seabird-watching boat operations based out of Westport on Brier Island and on adjacent Long Island. In general, tourism interests support conservation of the area due to the relatively high number of visiting birders and nature-oriented tourists. The Nova Scotia Bird Society Sactuary Trust owns Peter Island as a bird sanctuary, and encourages conservation there. Bird-banding has occurred on Brier Island for many years, with fall banding occurring over a 12-week period.

The marine and intertidal areas are overseen by the federal Department of Fisheries and Oceans, while the island is a mix of private and provincial crown land. The Nature Conservancy of Canada owns and manages the 485 ha (1200 acre) Brier Island Nature Preserve, encompassing the entire southern third of the island.

Conservation issues of concern in the area include the overuse of the islands water supply, and limited space. Although there is no longer a large fishery on the island; the only known impact that the fishery has here now is that fish by-products help support a large gull population which in turn can have negative impacts on colonial seabirds, including tern.


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