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    Monitor variations in seabird numbers and colony size in the St. Lawrence system. Survey of over 20 species of seabirds and herons during the breeding season, in order to monitor population dynamics through time and space. Seabird populations are influenced by food abundance and quality. There is actually more than 1,000,000 birds from more than 20 different species that breed in nearly 1,000 active colonies. Plongeon du Pacifique/Pacific Loon/Gavia Pacifica, Plongeon catmarin/Red-throated Loon/Gavia stellata, Macareux moine/Atlantic Puffin/Fratercula arctica, Guillemot à miroir/Black Guillemot/Cepphus grylle, Guillemot marmette/Common Murre/Uria aalge, Guillemot de Brünnich/Thick-billed Murre/Uria lomvia, Petit Pingouin/Razorbill/Alca torda, Mouette tridactyle/Black-legged Kittiwake/Rissa tridactyla, Goéland marin/Great Black-backed Gull/Larus marinus, Goéland argenté/Herring Gull/Larus argentatus, Goéland à bec cerclé/Ring-billed Gull/Larus delawarensis, Mouette rieuse/Common Black-headed Gull/Larus ridibundus, Sterne caspienne/Caspian Tern/Sterna caspia, Sterne pierregarin/Common Tern/Sterna hirundo, Sterne arctique/ArcticTern/Sterna paradisaea, Sterne de Dougall/Roseate Tern/Sterna dougallii, Océanite cul-blanc/Leach's Storm-Petrel/Oceanodroma leucorhoa, Fou de Bassan/Northern Gannet/Morus bassanus, Grand Cormoran/Great Cormorant/Phalacrocorax carbo, Cormoran à aigrettes/Double-crested Cormorant/Phalacrocorax auritus, Eider à duvet/Common Eider/Somateria mollissima, Grand Héron/Great Blue Heron/Ardea herodias, Bihoreau gris/Black-crowned Night-Heron/Nycticorax nycticorax.