Le Pilier de bois, part of the Montmagny archipelago, is about 6 kilometres from the St. Lawrence River south shore, near the village of Saint-Jean-Port-Joli, Québec. This small rocky island of 3.6 hectares is uninhabited although a lighthouse remains from earlier times. The sparse vegetation includes Chokecherry, White Spruce, White Birch and Trembling Aspen.
Four colonial waterbirds breed on Le Pilier de bois according to surveys conducted since 1990. The most important bird is the Double-crested Cormorant: the average colony size of the last three surveys (1987, 1989 and 1990) was 1,405 pairs, representing about 1.5% of the Atlantic population. This species has increased since only 150 pairs were present in 1971.
Black-crowned Night-Herons have not been detected since 1971. A nationally significant 50 pairs were present that year. Common Eiders also used to nest here - the last record was of 20 pairs in 1975. In addition to the cormorants, three other species currently nest on the island. Razorbills have been found nesting here in the last four surveys (1990-1995) with an average of 60 individuals present. Two species of gulls, Herring and Great Black-backed, were present on the island in 1990, with 104 and 15 pairs, respectively. Similar numbers of both species nested here in 1971, but apparently no gulls were present in 1979.
BirdLife International (2022) Important Bird Areas factsheet: Le Pilier de Bois. Downloaded from http://www.birdlife.org on 05/07/2022.