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Country Island Complex (NS028)

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Country Island Complex (NS028)

Country Harbour/Tor Bay, Nouvelle-Écosse

Latitude 45,158°N
Longitude 61,452°O
Altitude 0 - 10m
Superficie 16,35km²

Description du site

Roseate Terns (identified as nationally Threatened by COSEWIC) have been recorded nesting on Country Island since the late 1980s. In 1987, 1995, and 1996 an average of 30 - 35 pairs of Roseate Terns were recorded. In 1996, 45 pairs (about 37.5% of the estimated national population) were estimated among approximately 330 Arctic Terns and 130 Common Terns. During that year, however, exceptionally high predation by gulls, crows and ravens resulted in almost complete breeding failure. In 1997, only one pair of Roseate Terns attempted to nest on the island and the number of Common and Arctic Terns decreased by half. In 1998 only three pairs of Roseate Terns nested on the island, although one pair abandoned their nest early in incubation. The number of Arctic and Common Terns nesting in 1998 increased to near 1996 levels.

In 1997, surveys of adjacent islands (within 100 km) located a total of 17 pairs of Roseate Terns at three sites: an unamed island off Charlos Cove, a peninsula at Fisherman's Harbour and Inner West Bird Island. In 1998, Roseate terns were located at the Fisherman's Harbour colony and on Dorts Island in Tor Bay, but were absent from Charlos Cove, and Inner West Bird Island. During surveys completed in 1987, Roseate Terns were suspected of nesting at one of the Bird Islands, and at two sites in Tor Bay (Cooks Island and Hog Island). This suggests that the “Country Island Complex” has been in existence for some time.

In addition to the nesting terns, over 50,000 pairs of Leach's Storm-Petrels were estimated on Country Island in 1998. This represents about 2% of the estimated western Atlantic population. Until 1997, about 90 pairs of Herring Gulls and 20 pairs of Great Black-backed Gulls also nested on the island; nesting by these gull species is now actively discouraged as part of a Tern Restoration Plan (see below).

Oiseaux

Roseate Terns (identified as nationally Threatened by COSEWIC) have been recorded nesting on Country Island since the late 1980s. In 1987, 1995, and 1996 an average of 30 - 35 pairs of Roseate Terns were recorded. In 1996, 45 pairs (about 37.5% of the estimated national population) were estimated among approximately 330 Arctic Terns and 130 Common Terns. During that year, however, exceptionally high predation by gulls, crows and ravens resulted in almost complete breeding failure. In 1997, only one pair of Roseate Terns attempted to nest on the island and the number of Common and Arctic Terns decreased by half. In 1998 only three pairs of Roseate Terns nested on the island, although one pair abandoned their nest early in incubation. The number of Arctic and Common Terns nesting in 1998 increased to near 1996 levels.

In 1997, surveys of adjacent islands (within 100 km) located a total of 17 pairs of Roseate Terns at three sites: an unamed island off Charlos Cove, a peninsula at Fisherman's Harbour and Inner West Bird Island. In 1998, Roseate terns were located at the Fisherman's Harbour colony and on Dorts Island in Tor Bay, but were absent from Charlos Cove, and Inner West Bird Island. During surveys completed in 1987, Roseate Terns were suspected of nesting at one of the Bird Islands, and at two sites in Tor Bay (Cooks Island and Hog Island). This suggests that the "Country Island Complex” has been in existence for some time.

In addition to the nesting terns, over 50,000 pairs of Leach's Storm-Petrels were estimated on Country Island in 1998. This represents about 2% of the estimated western Atlantic population. Until 1997, about 90 pairs of Herring Gulls and 20 pairs of Great Black-backed Gulls also nested on the island; nesting by these gull species is now actively discouraged as part of a Tern Restoration Plan (see below).

Enjeux de conservation

Predation by gulls and corvids, appears to be the most significant threat affecting the nesting terns, and in 1997 it led to a partial abandonment of the colony. In recognition of this event, and the on-going threat posed by predation, the Canadian Wildlife Service, in conjunction with the Canadian Roseate Tern Recovery Team, the Canadian Coast Guard, and the Nova Scotia Department of Natural Resources, developed a Tern Restoration Plan for Country Island. A program of non-lethal gull control was implemented by disrupting the early breeding season of both Herring and Great Black-backed Gulls. American Crow and Common Raven nests were removed as well. Country Island is currently owned by the Canadian Coast Guard (Department of Fisheries and Oceans). Environment Canada is considering Country Island as a potential Migratory Bird Sanctuary.

Catégories ZICO Habitats Usages Menaces Potencielles ou Existantes Status de Protection
Puffin des Anglais
Nombre Année Saison
62019Été
Sterne de Dougall
Nombre Année Saison
42021Été
4 - 82018Été
32010Été
1082000Été
321999Été
61998Été
21997Été
901996Été
601993Été
Bruant des prés
Nombre Année Saison
252018Été
252018Printemps