. The Canadian field-naturalist. 1991 Chapdelaine and Brousseau: Seabird Populations 61. Figure 1. Location of the sanctuaries of the North Shore of the Gulf of St. Lawrence. all the nests on at least 28% of the land area and extrapolated an average density over the entire area of all the islands. On Sainte-Marie and Perroquet Islands, we carried out systematic counts. In the Betchouane Bird Sanctuary, we conducted a systematic count of the nests on Calculot Island and used varying sizes of sample units (Caughley 1977) on Innu Island. Larids: Where gull colonies numbered fewer than 100 nests,
. The Canadian field-naturalist. 1991 Chapdelaine and Brousseau: Seabird Populations 61. Figure 1. Location of the sanctuaries of the North Shore of the Gulf of St. Lawrence. all the nests on at least 28% of the land area and extrapolated an average density over the entire area of all the islands. On Sainte-Marie and Perroquet Islands, we carried out systematic counts. In the Betchouane Bird Sanctuary, we conducted a systematic count of the nests on Calculot Island and used varying sizes of sample units (Caughley 1977) on Innu Island. Larids: Where gull colonies numbered fewer than 100 nests, we conducted systematic counts. In large colonies where the nests were particularly scattered, we sampled sub-colonies where the number of nests (Np) and the number of adults (Ni) were determined. Then, using the factor k (k = Np/Ni), we estimated the number of pairs in the colonies where we counted only nesting individuals. These methods were applied specifi- cally to Herring and Ring-billed gulls and to Common and Arctic terns. In the case of the Great Black-backed Gull, we counted adults nesting in the colonies. Alcids: We conducted a systematic count of eggs in the majority of the Razorbill and Common Murre colonies. However, because of the expansion of the two Common Murre colonies on East and Cliff islands (lies Sainte-Marie Bird Sanctuary), we counted individuals nesting in the colonies and on adjacent water from a distance to avoid any disturbance that might have caused loss of eggs. The Black Guillemot population was estimated from adult bird counts around the islands. A systematic count of active burrows was taken in the Atlantic Puffin colonies in the Betchouane Bird Sanctuary, lies Sainte-Marie, and lies aux Perroquet Bird Sanctuaries. On Blacklands Island, home of the vast majority of Atlantic Puffins in the Baie des Loups Bird sanctuary, we used the factor k method described above for larids. Elsewhere in the sanctuary, we conducted a systematic count of active bu
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