. The Canadian field-naturalist. 1975 Vermeer and Vermeer: Oil Threat to Birds on Coast 293 ANCIENT MURRELET PIGEON GUILLEMOT <K MAJOR Breeding Concentrations (?) Langara Region /^ Southeast and South ^-^ Queen Charlotte Islands @ Scott Islands MINOR Breeding Concentrations 1 Hippa Island 2 Pine. Tree, and Storm Islands 3 Solander Island 4 Clayoquot and Barkley Sounds 5 Mandarte Island 6 Mitlenatch Island ANCIENT MURRELET IslandS \. FORK-TAILED PETREL ANCIENT MURRELET CASSINS AUKLET RHINOCEROS AUKLET LEACH'S PETREL PIGEON GUILLEMOT TUFTED PUFFIN CASSIN'S AUKLET RHINOCEROS AUKLET PIGEON
. The Canadian field-naturalist. 1975 Vermeer and Vermeer: Oil Threat to Birds on Coast 293 ANCIENT MURRELET PIGEON GUILLEMOT <K MAJOR Breeding Concentrations (?) Langara Region /^ Southeast and South ^-^ Queen Charlotte Islands @ Scott Islands MINOR Breeding Concentrations 1 Hippa Island 2 Pine. Tree, and Storm Islands 3 Solander Island 4 Clayoquot and Barkley Sounds 5 Mandarte Island 6 Mitlenatch Island ANCIENT MURRELET IslandS \. FORK-TAILED PETREL ANCIENT MURRELET CASSINS AUKLET RHINOCEROS AUKLET LEACH'S PETREL PIGEON GUILLEMOT TUFTED PUFFIN CASSIN'S AUKLET RHINOCEROS AUKLET PIGEON GUILLEMOT GLAUCOUS-WINGED GULL COMMON MURRE PELAGIC CORMORANT 3 TUFTED PUFFIN LEACHS PETREL GLAUCOUS-WINGED GULL- Figure 4. Breeding concentrations of seabirds along the coast. munication) estimated that there were 10 000 breeding pairs of Ancient Murrelets at Hippa Island in 1971; Drent and Guiguet (1961) reported three separate large colonies of Leach's Petrels (Oceanodroma leucorhoa) and one large colony of Rhinoceros Auklets on islands at the entrance of the Queen Charlotte Strait. They also reported an "immense" colony of Tufted Puffins on Solander Island com- parable in size to that of Triangle Island in the Scott Islands (approximately 10 000 pairs). The numbers of seabirds nesting at Barkley and Clayoquot Sound have been reported by Campbell and Stirling (1967), Guiguet (1971), and Hatler et al. (1973). Approximately 10- 000 pairs of seabirds nest there, about half of which are Leach's Petrels. Another colony, with approximately 3000 pairs of seabirds and known for its diversified seabird life (Drent et al. 1964), is Mandarte Island. Mandarte Is- land is situated in a busy shipping lane which connects Juan de Fuca Strait with Georgia Strait. Alcids are the most numerous breeders on the coast (Table 9). Large-scale fluctua- tions of alcid populations are known to occur, but their causes are unknown. For instance, Ancient Murrelets occurred in hundred
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