Ring-billed Gull
Scientific Name: Larus delawarensis
Thresholds:
- Leslie Street Spit (ON038)149,128 (max.)
- Presqu'ile Provincial Park (ON004)138,834 (max.)
- Wildwood Gull Roost (ON045)110,000 (max.)
- Île Deslauriers (QC126)103,354 (max.)
- Port Colborne (breakwater and mainland) (ON019)92,180 (max.)
- Pittock Reservoir (ON027)86,000 (max.)
- Hamilton Harbour Waterbird Colonies (ON020)80,000 (max.)
- Lower Detroit River (ON047)68,042 (max.)
- Long Point Peninsula and Marshes (ON001)65,000 (max.)
- Île de la Couvée (QC127)60,192 (max.)
- Limestone Islands (ON052)40,606 (max.)
- Kaweenakumik Lake (MB007)40,000 (max.)
- Point Pelee (ON006)34,000 (max.)
- Niagara River Corridor (ON002)32,000 (max.)
- Réserve nationale de faune des Îles-de-Contrecoeur (QC125)31,764 (max.)
- Eastern Lake St. Clair (ON012)22,177 (max.)
- Miquelon Lake (AB071)20,174 (max.)
- Barrage de Beauharnois (QC131)20,032 (max.)
- Battures de Beauport and chenal de l'île d'Orléans (QC107)20,000 (max.)
- Riverton Sandy Bar (MB091)20,000 (max.)
Global
1% of the global population estimate. This threshold is used to identify trigger species and IBAs under categories A4i/ii and A4iv.
Regional/Continental
1% of the regional/continental population estimate.
| Leslie Street Spit (ON038) | ||
|---|---|---|
| Number | Year | Season |
| 100,000 | 2011 | Spring |
| 110,000 | 1986 | Summer |
| 149,128 | 1984 | Summer |
| Presqu'ile Provincial Park (ON004) | ||
|---|---|---|
| Number | Year | Season |
| 50,000 | 2014 | Spring |
| 20,000 | 2013 | Spring |
| 50,000 | 1991 | Spring |
| 63,608 - 75,224 | 1990 | Spring |
| 138,834 | 1990 | Summer |
| Wildwood Gull Roost (ON045) | ||
|---|---|---|
| Number | Year | Season |
| 40,000 | 1997 | Summer |
| 110,000 | 1994 | Fall |
| 100,000 | 1993 | Fall |
| 50,000 | 1992 | Fall |
| 50,000 | 1991 | Fall |
| Île Deslauriers (QC126) | ||
|---|---|---|
| Number | Year | Season |
| 30,000 | 2021 | Spring |
| 30,000 | 2020 | Spring |
| 25,000 | 2019 | Spring |
| 25,000 - 30,000 | 2018 | Summer |
| 25,000 - 50,000 | 2017 | Summer |
| 40,000 | 2017 | Spring |
| 95,778 | 2009 | Spring |
| 102,000 | 2006 | Spring |
| 101,620 | 2003 | Spring |
| 103,354 | 2000 | Spring |
| 103,334 | 2000 | Summer |
| 97,534 | 1997 | Spring |
| 97,534 | 1997 | Summer |
| 97,582 | 1994 | Spring |
| 97,582 | 1994 | Summer |
| 94,402 | 1991 | Spring |
| 94,402 | 1991 | Summer |
| 4,500 | 1989 | Summer |
| 10,680 | 1981 | Summer |
| 9,922 | 1980 | Summer |
| Port Colborne (breakwater and mainland) (ON019) | ||
|---|---|---|
| Number | Year | Season |
| 71,074 | 1999 | Spring |
| 92,180 | 1990 | Summer |
| Pittock Reservoir (ON027) | ||
|---|---|---|
| Number | Year | Season |
| 86,000 | 1992 | Fall |
| 56,000 | 1989 | Fall |
| Hamilton Harbour Waterbird Colonies (ON020) | ||
|---|---|---|
| Number | Year | Season |
| 24,000 | 2021 | Spring |
| 80,000 | 1995 | Spring |
| 79,242 | 1990 | Summer |
| Lower Detroit River (ON047) | ||
|---|---|---|
| Number | Year | Season |
| 68,042 | 1990 | Summer |
| 0 | 1977 | Summer |
| Long Point Peninsula and Marshes (ON001) | ||
|---|---|---|
| Number | Year | Season |
| 23,000 | 2014 | Spring |
| 65,000 | 1992 | Summer |
| 16,000 - 50,000 | 1992 | Spring |
| Île de la Couvée (QC127) | ||
|---|---|---|
| Number | Year | Season |
| 30,426 | 2003 | Spring |
| 21,502 | 2000 | Spring |
| 21,502 | 2000 | Summer |
| 41,740 | 1997 | Spring |
| 41,740 | 1997 | Summer |
| 60,192 | 1994 | Spring |
| 60,192 | 1994 | Summer |
| 56,228 | 1990 | Spring |
| 56,226 | 1990 | Summer |
| 30,000 | 1989 | Summer |
| 32,186 | 1982 | Summer |
| 28,662 | 1981 | Summer |
| 29,464 | 1980 | Summer |
| Limestone Islands (ON052) | ||
|---|---|---|
| Number | Year | Season |
| 40,606 | 1989 | Summer |
| 26,800 | 1980 | Summer |
| Kaweenakumik Lake (MB007) | ||
|---|---|---|
| Number | Year | Season |
| 1,003 | 2012 | Summer |
| 4,000 | 1995 | Other |
| 8,000 | 1986 | Summer |
| 40,000 | 1985 | Summer |
| 24,000 | 1979 | Summer |
| Point Pelee (ON006) | ||
|---|---|---|
| Number | Year | Season |
| 27,000 | 2006 | Winter |
| 34,000 | 2005 | Winter |
| Niagara River Corridor (ON002) | ||
|---|---|---|
| Number | Year | Season |
| 4,000 | 2011 | Fall |
| 10,000 | 2010 | Fall |
| 23,000 | 2009 | Winter |
| 32,000 | 1998 | Summer |
| 18,000 - 27,000 | 1995 | Fall |
| Réserve nationale de faune des Îles-de-Contrecoeur (QC125) | ||
|---|---|---|
| Number | Year | Season |
| 19,658 | 2009 | Spring |
| 26,818 | 2006 | Spring |
| 25,704 | 2003 | Spring |
| 22,536 | 2000 | Spring |
| 26,412 | 2000 | Summer |
| 28,198 | 1997 | Spring |
| 31,764 | 1997 | Summer |
| 22,754 | 1994 | Summer |
| 19,294 | 1991 | Spring |
| 22,718 | 1991 | Summer |
| 4,682 | 1981 | Summer |
| 12,508 | 1980 | Summer |
| Eastern Lake St. Clair (ON012) | ||
|---|---|---|
| Number | Year | Season |
| 22,177 | 2001 | Winter |
| 15,942 | 1999 | Winter |
| 20,123 | 1993 | Winter |
| Miquelon Lake (AB071) | ||
|---|---|---|
| Number | Year | Season |
| 19,850 | 1985 | Other |
| 20,174 | 1976 | Summer |
| Barrage de Beauharnois (QC131) | ||
|---|---|---|
| Number | Year | Season |
| 19,642 | 2009 | Spring |
| 20,032 | 2006 | Spring |
| 16,118 | 2000 | Summer |
| 10,000 | 1999 | Summer |
| 12,312 | 1997 | Summer |
| 10,898 | 1994 | Summer |
| 14,030 | 1992 | Summer |
| 14,064 | 1991 | Summer |
| Battures de Beauport and chenal de l'île d'Orléans (QC107) | ||
|---|---|---|
| Number | Year | Season |
| 20,000 | 1992 | Spring |
| Riverton Sandy Bar (MB091) | ||
|---|---|---|
| Number | Year | Season |
| 170 | 2012 | Summer |
| 20,000 | 1991 | Summer |