Greater Scaup
Scientific Name: Aythya marila
Thresholds:
- West End of Lake Ontario (ON022)100,000 (max.)
- Point Pelee (ON006)60,000 (max.)
- Canal de Beauharnois (QC161)50,000 (max.)
- Prince Edward County South Shore (ON003)39,000 (max.)
- Long Point Peninsula and Marshes (ON001)30,150 (max.)
- Niagara River Corridor (ON002)30,000 (max.)
- Old Crow Flats (YK001)25,000 (max.)
- Hamilton Harbour Waterbird Colonies (ON020)20,000 (max.)
- Wolfe Island (ON037)20,000 (max.)
- Greater Rondeau Area (ON007)18,000 (max.)
- Dundas Valley and Dundas Marsh (ON005)17,556 (max.)
- Napanee Limestone Plain (ON152)15,212 (max.)
- Pelee Island Natural Areas (ON013)15,000 (max.)
- Presqu'ile Provincial Park (ON004)13,150 (max.)
- Eastern Lake St. Clair (ON012)9,520 (max.)
- Boundary Bay - Roberts Bank - Sturgeon Bank (Fraser River Estuary) (BC017)8,165 (max.)
- Little Qualicum Estuary to Nanoose Bay (BC056)8,000 (max.)
- Barrage de Beauharnois (QC131)5,000 (max.)
- Baynes Sound (BC057)5,000 (max.)
- K'ómoks (BC272)5,000 (max.)
- Lac Saint-Louis et Îles-de-la-Paix (QC134)5,000 (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.
| West End of Lake Ontario (ON022) | ||
|---|---|---|
| Number | Year | Season |
| 6,087 | 2018 | Winter |
| 6,038 - 7,127 | 2017 | Winter |
| 5,000 - 5,200 | 2015 | Winter |
| 7,000 | 2014 | Winter |
| 5,988 | 2013 | Winter |
| 14,444 | 2012 | Winter |
| 14,630 | 2011 | Winter |
| 6,500 | 2010 | Winter |
| 12,460 | 2007 | Winter |
| 4,700 | 2006 | Winter |
| 7,194 | 2005 | Winter |
| 5,000 | 2004 | Fall |
| 20,000 | 2002 | Fall |
| 4,500 - 25,000 | 2001 | Fall |
| 10,000 | 2001 | Winter |
| 6,000 - 10,000 | 2000 | Fall |
| 5,000 - 7,000 | 2000 | Winter |
| 4,770 | 1999 | Fall |
| 15,000 | 1999 | Winter |
| 8,000 | 1998 | Fall |
| 7,500 - 30,000 | 1997 | Winter |
| 5,000 - 10,000 | 1996 | Fall |
| 5,000 - 10,000 | 1996 | Winter |
| 10,000 | 1995 | Fall |
| 10,000 | 1995 | Spring |
| 5,000 - 10,000 | 1995 | Winter |
| 8,000 | 1994 | Fall |
| 5,000 - 10,800 | 1994 | Winter |
| 5,313 | 1993 | Fall |
| 6,750 | 1993 | Spring |
| 5,000 | 1993 | Winter |
| 100,000 | 1992 | Winter |
| Point Pelee (ON006) | ||
|---|---|---|
| Number | Year | Season |
| 8,000 - 40,000 | 2021 | Winter |
| 5,000 - 20,000 | 2020 | Winter |
| 10,000 - 15,000 | 2020 | Fall |
| 4,300 - 7,000 | 2019 | Winter |
| 10,000 - 11,000 | 2018 | Winter |
| 5,000 - 9,000 | 2018 | Spring |
| 4,500 | 2017 | Winter |
| 4,500 | 2016 | Spring |
| 7,200 | 2016 | Winter |
| 5,000 - 7,400 | 2015 | Winter |
| 50,000 | 2015 | Spring |
| 16,850 - 32,000 | 2014 | Winter |
| 7,000 - 60,000 | 2014 | Fall |
| 5,000 - 50,000 | 2013 | Winter |
| 5,500 - 50,000 | 2012 | Winter |
| 10,000 - 38,000 | 2012 | Fall |
| 10,000 - 12,000 | 2011 | Spring |
| 12,000 | 2011 | Winter |
| 15,000 - 17,000 | 2010 | Winter |
| 8,000 - 10,000 | 2010 | Spring |
| 5,000 - 23,000 | 2009 | Spring |
| 5,300 | 2008 | Spring |
| 13,500 | 2006 | Winter |
| 12,000 | 2005 | Winter |
| 5,500 | 2004 | Winter |
| 9,000 | 2000 | Winter |
| 7,000 | 1994 | Spring |
| 7,500 | 1993 | Spring |
| Canal de Beauharnois (QC161) | ||
|---|---|---|
| Number | Year | Season |
| 50,000 | 1974 | Fall |
| ? | ? | Other |
| Prince Edward County South Shore (ON003) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 - 17,000 | 2017 | Fall |
| 9,000 - 29,100 | 2012 | Winter |
| 5,000 | 2009 | Fall |
| 10,000 - 16,600 | 2008 | Fall |
| 5,000 | 2006 | Fall |
| 5,000 - 8,500 | 2005 | Fall |
| 5,000 - 10,000 | 2002 | Fall |
| 5,000 | 1996 | Spring |
| 39,000 | 1994 | Fall |
| Long Point Peninsula and Marshes (ON001) | ||
|---|---|---|
| Number | Year | Season |
| 4,302 | 2020 | Fall |
| 4,700 - 5,001 | 2019 | Fall |
| 5,750 - 30,150 | 2018 | Fall |
| 5,000 - 10,000 | 2017 | Fall |
| 5,000 | 2016 | Winter |
| 5,000 - 20,000 | 2016 | Fall |
| 5,000 | 2015 | Spring |
| 5,200 - 13,053 | 2014 | Winter |
| 10,000 - 19,000 | 2014 | Fall |
| 6,000 | 2013 | Fall |
| 10,000 - 18,000 | 2012 | Winter |
| 8,200 - 25,000 | 2012 | Fall |
| 5,000 | 2012 | Spring |
| 5,722 - 6,000 | 2011 | Winter |
| 5,015 | 2006 | Winter |
| 9,116 | 2004 | Winter |
| 5,000 - 25,100 | 2000 | Fall |
| 15,185 | 1999 | Winter |
| 8,000 | 1999 | Fall |
| 8,000 - 13,951 | 1998 | Winter |
| 23,686 | 1998 | Spring |
| 7,982 | 1997 | Winter |
| 8,782 | 1991 | Winter |
| Niagara River Corridor (ON002) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 | 2020 | Winter |
| 10,159 | 2019 | Winter |
| 6,900 - 8,670 | 2018 | Winter |
| 5,000 - 5,234 | 2015 | Winter |
| 6,000 | 2014 | Spring |
| 1,800 - 7,141 | 2011 | Winter |
| 4,778 | 2010 | Winter |
| 8,835 | 2009 | Winter |
| 13,900 - 18,620 | 2008 | Winter |
| 2,000 | 2004 | Winter |
| 4,000 | 2003 | Fall |
| 5,773 | 2002 | Winter |
| 10,500 | 2000 | Winter |
| 7,600 | 1999 | Fall |
| 10,000 - 30,000 | 1999 | Winter |
| 10,000 | 1997 | Winter |
| 7,800 | 1996 | Winter |
| 2,135 | 1995 | Fall |
| 5,887 | 1993 | Winter |
| 10,031 | 1990 | Fall |
| 2,146 | 1985 | Fall |
| 15,000 | 1979 | Fall |
| 2,256 | 1975 | Fall |
| Old Crow Flats (YK001) | ||
|---|---|---|
| Number | Year | Season |
| 25,000 | 1995 | Summer |
| Hamilton Harbour Waterbird Colonies (ON020) | ||
|---|---|---|
| Number | Year | Season |
| 4,792 | 2010 | Winter |
| 4,814 | 2009 | Fall |
| 5,725 | 2008 | Winter |
| 6,750 | 2005 | Winter |
| 14,627 | 2002 | Winter |
| 5,000 | 2001 | Spring |
| 20,000 | 2000 | Winter |
| 5,000 | 1993 | Spring |
| Wolfe Island (ON037) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 | 2020 | Fall |
| 5,388 | 2018 | Fall |
| 4,248 | 2017 | Spring |
| 4,729 | 2015 | Fall |
| 6,976 | 2011 | Winter |
| 5,000 - 10,000 | 2010 | Fall |
| 4,800 - 20,000 | 2009 | Fall |
| 5,000 | 2003 | Fall |
| 7,000 | 2003 | Spring |
| 4,227 | 2002 | Winter |
| 6,934 | 1998 | Winter |
| 10,000 | 1998 | Fall |
| 15,000 | 1996 | Spring |
| 10,000 | 1995 | Spring |
| 8,000 | 1990 | Fall |
| Greater Rondeau Area (ON007) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 - 18,000 | 2017 | Winter |
| 7,500 - 7,540 | 2016 | Winter |
| 15,000 | 2016 | Fall |
| 12,500 | 1995 | Spring |
| Dundas Valley and Dundas Marsh (ON005) | ||
|---|---|---|
| Number | Year | Season |
| 4,874 - 4,875 | 2010 | Winter |
| 14,580 - 14,584 | 2009 | Winter |
| 4,500 - 7,194 | 2005 | Winter |
| 10,861 | 2004 | Winter |
| 11,401 | 2003 | Winter |
| 13,131 | 2002 | Winter |
| 7,147 | 2001 | Winter |
| 5,886 | 2000 | Winter |
| 17,556 | 1999 | Winter |
| 6,256 - 10,000 | 1998 | Winter |
| 9,370 | 1997 | Winter |
| 10,600 | 1995 | Winter |
| 5,000 | 1993 | Winter |
| Napanee Limestone Plain (ON152) | ||
|---|---|---|
| Number | Year | Season |
| 7,676 - 15,212 | 2004 | Spring |
| Pelee Island Natural Areas (ON013) | ||
|---|---|---|
| Number | Year | Season |
| 15,000 | 2013 | Winter |
| Presqu'ile Provincial Park (ON004) | ||
|---|---|---|
| Number | Year | Season |
| 4,500 | 2019 | Spring |
| 8,000 | 2016 | Spring |
| 5,000 | 2011 | Fall |
| 5,000 - 5,500 | 2010 | Fall |
| 5,349 | 2009 | Spring |
| 5,000 | 2008 | Spring |
| 5,450 - 13,150 | 2004 | Spring |
| 5,857 - 12,890 | 2004 | Winter |
| 5,000 - 9,573 | 2003 | Spring |
| 10,000 | 2002 | Winter |
| 6,000 | 2001 | Spring |
| 4,400 | 2001 | Winter |
| 5,650 | 2000 | Spring |
| 5,000 - 7,600 | 2000 | Winter |
| 6,000 | 1999 | Fall |
| 5,000 | 1999 | Spring |
| 5,000 - 10,500 | 1995 | Spring |
| 5,200 | 1995 | Winter |
| 7,800 | 1994 | Spring |
| 11,000 | 1981 | Winter |
| Eastern Lake St. Clair (ON012) | ||
|---|---|---|
| Number | Year | Season |
| 4,816 | 2009 | Winter |
| 9,520 | 2003 | Winter |
| Boundary Bay - Roberts Bank - Sturgeon Bank (Fraser River Estuary) (BC017) | ||
|---|---|---|
| Number | Year | Season |
| 5,200 | 2021 | Spring |
| 6,000 | 2020 | Winter |
| 5,000 - 6,100 | 2020 | Spring |
| 5,103 | 2007 | Winter |
| 6,900 | 2000 | Spring |
| 6,166 | 1993 | Winter |
| 5,000 - 8,165 | 1991 | Winter |
| Little Qualicum Estuary to Nanoose Bay (BC056) | ||
|---|---|---|
| Number | Year | Season |
| 4,250 - 6,500 | 2020 | Spring |
| 5,080 - 8,000 | 2018 | Spring |
| 6,500 - 7,000 | 2017 | Spring |
| 4,600 | 2004 | Spring |
| Barrage de Beauharnois (QC131) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 | 1992 | Fall |
| 5,000 | 1990 | Winter |
| Baynes Sound (BC057) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 | 2010 | Spring |
| K'ómoks (BC272) | ||
|---|---|---|
| Number | Year | Season |
| 5,000 | 2010 | Spring |
| Lac Saint-Louis et Îles-de-la-Paix (QC134) | ||
|---|---|---|
| Number | Year | Season |
| 4,400 | 2020 | Fall |
| 5,000 | 2001 | Fall |