Great Black-backed Gull
Scientific Name: Larus marinus
Thresholds:
- Quidi Vidi Lake (NF022)8,000 (max.)
- Southern Bight, Minas Basin (NS020)5,736 (max.)
- South Shore (Barrington Bay Sector) (NS018)3,097 (max.)
- Quoddy Region (NB037)2,932 (max.)
- Gros Morne National Park (NF045)2,548 (max.)
- Niagara River Corridor (ON002)2,089 (max.)
- Baie des Escoumins et Grandes-Bergeronnes (QC084)2,000 (max.)
- Brier Island and Offshore Waters (NS021)2,000 (max.)
- Île Brion (QC007)2,000 (max.)
- Machias Seal Island (NB019)2,000 (max.)
- Lac Deschênes-Ottawa River (ON112)1,700 (max.)
- Sable Island, Nova Scotia (NS025)1,600 (max.)
- Île aux Pommes (QC047)1,568 (max.)
- Tadoussac (QC085)1,525 (max.)
- Bon Portage Island (NS015)1,500 (max.)
- Île Bonaventure / Bonaventure Island (QC001)1,500 (max.)
- Îles Sainte-Marie (QC065)1,500 (max.)
- Rimouski (QC041)1,500 (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.
| Quidi Vidi Lake (NF022) | ||
|---|---|---|
| Number | Year | Season |
| 3,000 | 2019 | Winter |
| 2,000 | 2018 | Spring |
| 3,000 | 2018 | Winter |
| 1,500 - 2,000 | 2017 | Winter |
| 2,000 | 2014 | Winter |
| 2,000 | 2013 | Winter |
| 2,000 | 2013 | Fall |
| 1,400 - 2,000 | 2011 | Winter |
| 1,400 | 2010 | Winter |
| 2,000 | 2008 | Winter |
| 3,365 | 1996 | Winter |
| 5,970 - 8,000 | 1995 | Winter |
| 1,729 | 1993 | Winter |
| Southern Bight, Minas Basin (NS020) | ||
|---|---|---|
| Number | Year | Season |
| 2,556 | 2002 | Winter |
| 4,048 | 2001 | Winter |
| 3,586 | 1998 | Winter |
| 2,498 | 1997 | Winter |
| 1,749 | 1996 | Winter |
| 3,198 | 1995 | Winter |
| 5,736 | 1994 | Winter |
| 4,550 | 1993 | Winter |
| 5,175 | 1992 | Winter |
| 2,649 | 1991 | Winter |
| 1,720 | 1990 | Winter |
| South Shore (Barrington Bay Sector) (NS018) | ||
|---|---|---|
| Number | Year | Season |
| 3,097 | 2014 | Winter |
| 1,478 | 2005 | Winter |
| 1,397 | 2000 | Winter |
| Quoddy Region (NB037) | ||
|---|---|---|
| Number | Year | Season |
| 796 | 1999 | Winter |
| 954 | 1998 | Winter |
| 1,844 | 1997 | Winter |
| 2,932 | 1996 | Winter |
| 440 | 1995 | Winter |
| 767 | 1994 | Winter |
| 2,117 | 1993 | Winter |
| Gros Morne National Park (NF045) | ||
|---|---|---|
| Number | Year | Season |
| 2,548 | 2015 | Winter |
| 2,050 | 2014 | Winter |
| Niagara River Corridor (ON002) | ||
|---|---|---|
| Number | Year | Season |
| 1,540 | 1999 | Winter |
| 2,089 | 1998 | Winter |
| Baie des Escoumins et Grandes-Bergeronnes (QC084) | ||
|---|---|---|
| Number | Year | Season |
| 120 | 1995 | Spring |
| 52 | 1995 | Summer |
| 2,000 | 1984 | Spring |
| Brier Island and Offshore Waters (NS021) | ||
|---|---|---|
| Number | Year | Season |
| 2,000 | 2002 | Spring |
| Île Brion (QC007) | ||
|---|---|---|
| Number | Year | Season |
| 500 | 1985 | Summer |
| 2,000 | 1981 | Fall |
| 839 | 1976 | Summer |
| Machias Seal Island (NB019) | ||
|---|---|---|
| Number | Year | Season |
| 2,000 | 2007 | Winter |
| Lac Deschênes-Ottawa River (ON112) | ||
|---|---|---|
| Number | Year | Season |
| 1,500 | 2002 | Fall |
| 1,700 | 2002 | Winter |
| 1,450 | 1998 | Winter |
| 2,250 | 1996 | Winter |
| Sable Island, Nova Scotia (NS025) | ||
|---|---|---|
| Number | Year | Season |
| 1,373 - 1,600 | 2020 | Winter |
| 1,550 | 2017 | Winter |
| 1,200 | 1998 | Summer |
| 1,260 | 1970 | Summer |
| Île aux Pommes (QC047) | ||
|---|---|---|
| Number | Year | Season |
| 1,568 | 1990 | Spring |
| 1,560 | 1990 | Summer |
| 1,270 | 1977 | Summer |
| Tadoussac (QC085) | ||
|---|---|---|
| Number | Year | Season |
| 1,525 | 1996 | Fall |
| Bon Portage Island (NS015) | ||
|---|---|---|
| Number | Year | Season |
| 1,500 | 2016 | Fall |
| Île Bonaventure / Bonaventure Island (QC001) | ||
|---|---|---|
| Number | Year | Season |
| 410 | 2008 | Summer |
| 1,500 | 1978 | Fall |
| ? | ? | Other |
| Îles Sainte-Marie (QC065) | ||
|---|---|---|
| Number | Year | Season |
| 518 | 1993 | Summer |
| 210 | 1988 | Summer |
| 832 | 1982 | Summer |
| 1,500 | 1978 | Summer |
| 524 | 1977 | Summer |
| Rimouski (QC041) | ||
|---|---|---|
| Number | Year | Season |
| 1,500 | 2011 | Fall |
| 1,352 | 2008 | Fall |