Le Pilier de Pierre is a small rocky island, part of the Montmagny archipelago, 5.5 kilometres off the St. Lawrence south shore, near the village of St-Jean-Port-Joli, Québec. This island of only six hectares has very sparse vegetation and is uninhabited. The tidal area is mostly made of rocky outcrops.
Six colonial waterbird species have at some point nested on Le Pilier de Pierre: Herring, Great Black-backed and Ring-billed gulls, Common Tern, Double-crested Cormorant, and Common Eider. However the Ring-billed Gull dominates here: the average for the last six surveys (1979-2000) was 6,371 pairs. The numbers have been increasing since 1971, with the highest count occurring in 2000, when 9,239 pairs were recorded. This colony is one of the most important for this species in the St. Lawrence seaway.
Double-crested Cormorants are the next most common species. In 1999, 440 nests were counted by aerial survey. An average of 31 Herring Gull nests were recorded over the last four surveys (1979-1997). Great Black-backed Gull, Common Tern, and Common Eider have disappeared as breeders, perhaps because of human disturbance. However these species, nested in very low numbers when they were present.
BirdLife International (2022) Important Bird Areas factsheet: Le Pilier de Pierre. Downloaded from http://www.birdlife.org on 05/07/2022.