Year of compilation: 2001
The wetlands of Rondeau are recognized as a major waterfowl staging area. In addition, shorebirds are also found in large numbers. Species that are present in significant numbers (greater than 1% of their estimated North American or world population) include: Greater Scaup (1.6%); Tundra Swan (4% of their North American population); Common Goldeneye (about 1%); Ruddy Turnstone (1.2%); and Forsters Tern (about 1%). In spring and fall, thousands of Black-bellied Plovers and American Golden-Plovers can be seen feeding in open fields; the exact composition of these flocks, and therefore their significance, is not known, however. Up to 250 Whimbrel have also been recorded in spring migration.
Numerous nationally endangered species nest at Rondeau Provincial Park. The park has traditionally supported the largest breeding population of Prothonotary Warblers in Canada. This species has since declined in numbers, with only 13 pairs being recorded in Canada during 1997, six of which nested at Rondeau. Acadian Flycatchers and King Rails also breed at Rondeau: in 1997, four territorial Acadian Flycatchers were recorded in the mature deciduous forest habitats, and in the adjacent marsh, two King Rails were recorded. For both of these species, the estimated Canadian population is well below 100 pairs. In addition, at least nine pairs of Least Bitterns (nationally vulnerable) were recorded in 1997.
During the 1981 to 1985 surveys for the Atlas of the Breeding Birds of Ontario, the Rondeau area had the highest diversity of breeding birds in the province. Out of the more than 330 species recorded as breeding in Ontario, 134 were recorded in the Greater Rondeau Area.
BirdLife International (2022) Important Bird Areas factsheet: Greater Rondeau Area. Downloaded from http://www.birdlife.org on 26/06/2022.