. The Canadian field-naturalist. Gulf of St. Lawrence Magdalen Islands. â ^^ A^ NEWFOUNDLAND NEW BRUNSWICK 50 km Figure 1. Location of the sanctuaries of the North Shore of the Gulf of St. Lawrence. for Common Eiders (Chapdelaine 1978*). In the Bet- chouane Bird Sanctuary, we conducted a systematic nest count on Calculot Island, and (as in preceding censuses) used a system of line-transects of varying length on Innu Island (see Caughley 1977). In sanc- tuaries featuring many islands (, Watshishou, lie a la Brume, Baie des Loups), we counted all the nests on at least 27% of the land area an
. The Canadian field-naturalist. Gulf of St. Lawrence Magdalen Islands. â ^^ A^ NEWFOUNDLAND NEW BRUNSWICK 50 km Figure 1. Location of the sanctuaries of the North Shore of the Gulf of St. Lawrence. for Common Eiders (Chapdelaine 1978*). In the Bet- chouane Bird Sanctuary, we conducted a systematic nest count on Calculot Island, and (as in preceding censuses) used a system of line-transects of varying length on Innu Island (see Caughley 1977). In sanc- tuaries featuring many islands (, Watshishou, lie a la Brume, Baie des Loups), we counted all the nests on at least 27% of the land area and extrapolated an average density over the entire area of all the islands. On the lies aux Perroquets and lies Sainte-Marie sanc- tuaries, extrapolation was done after systematic counts were made on most large islands, covering 57% and 98% of total land area, respectively (but see Rail and Chapdelaine 2002 for details). Phalacrocoracids - Systematic counts of all Great and Double-crested Cormorant nests were carried out. At the Corossol Island colony, Double-crested Cormo- rant nests in treetops were counted from an elevated lookout point. Larids - In the large Herring Gull colony of Coros- sol Island, 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 sectors where we counted only the number of adults present. In the Betchouane Sanctuary, all gull nests were counted sys- tematically, and were attributed to Herring and Great Black-backed gulls according to the observed propor- tions of adults of both species. In the other sanctu- aries all larids were censused with a combination of nest counts and adult counts. Proportions of Arctic and Common terns in mixed tern colonies were not always determined, so the results for the two species are com- bined in Table 1. All Black-legged Kittiwake nests attended by adults were counted. Alcids - We carried out systema
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