Roseate Tern
Scientific Name: Sterna dougallii
Thresholds:
- The Brothers (NS003)172 (max.)
- Country Island Complex (NS028)108 (max.)
- Grassy Island Complex (NS026)90 (max.)
- South Shore (Barrington Bay Sector) (NS018)43 (max.)
- Sable Island, Nova Scotia (NS025)30 (max.)
- Eastern Cape Sable Island (NS016)20 (max.)
- Île Paquet (QC022)7 (max.)
- Machias Seal Island (NB019)5 (max.)
- South Shore (Port Joli sector) (NS004)5 (max.)
- La Pointe (QC013)4 (max.)
- Bassin aux Huîtres (QC015)3 (max.)
- Lagune du Havre aux Basques et plage de l'Ouest (QC003)3 (max.)
- Bon Portage Island (NS015)2 (max.)
- Îlot C (QC026)2 (max.)
- South Shore (Roseway to Baccaro) (NS017)2 (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.
Sub-regional/National SAR
The sub-regional/national SAR threshold = 1% of the COSEWIC population estimate for the region (provinces/territories) in which the species is listed as being at risk. This threshold is used to identify trigger species and IBAs under criterion C1.
| The Brothers (NS003) | ||
|---|---|---|
| Number | Year | Season |
| 2 - 40 | 2021 | Summer |
| 4 - 12 | 2021 | Spring |
| 2 | 2020 | Fall |
| 60 - 65 | 2020 | Summer |
| 2 - 4 | 2020 | Spring |
| 20 - 52 | 2019 | Summer |
| 9 | 2019 | Spring |
| 2 - 5 | 2018 | Summer |
| 3 - 7 | 2018 | Spring |
| 2 - 32 | 2017 | Summer |
| 15 - 20 | 2017 | Spring |
| 4 - 48 | 2016 | Summer |
| 2 - 15 | 2016 | Spring |
| 2 - 35 | 2015 | Summer |
| 2 - 15 | 2015 | Spring |
| 2 - 38 | 2014 | Summer |
| 3 - 6 | 2014 | Spring |
| 7 - 38 | 2013 | Summer |
| 2 - 15 | 2013 | Spring |
| 15 - 34 | 2012 | Summer |
| 3 - 12 | 2012 | Spring |
| 25 - 38 | 2011 | Summer |
| 3 - 22 | 2011 | Spring |
| 4 - 38 | 2010 | Summer |
| 3 - 5 | 2010 | Spring |
| 35 - 42 | 2009 | Summer |
| 2 - 20 | 2009 | Spring |
| 7 - 55 | 2008 | Summer |
| 2 - 5 | 2008 | Spring |
| 10 - 68 | 2007 | Summer |
| 47 - 67 | 2006 | Summer |
| 2 - 12 | 2006 | Spring |
| 45 - 68 | 2005 | Summer |
| 2 | 2005 | Spring |
| 35 - 68 | 2004 | Summer |
| 9 - 62 | 2003 | Summer |
| 2 - 70 | 2003 | Spring |
| 13 - 89 | 2002 | Summer |
| 2 - 3 | 2002 | Spring |
| 53 - 70 | 2001 | Summer |
| 3 | 2001 | Spring |
| 2 - 172 | 2000 | Summer |
| 6 - 12 | 2000 | Spring |
| 5 | 1999 | Fall |
| 20 - 122 | 1999 | Summer |
| 3 | 1999 | Spring |
| 4 - 118 | 1998 | Summer |
| 3 | 1998 | Spring |
| 2 | 1997 | Fall |
| 2 - 108 | 1997 | Summer |
| 2 - 3 | 1997 | Spring |
| 35 - 96 | 1996 | Summer |
| 6 | 1996 | Spring |
| 23 - 66 | 1995 | Summer |
| 12 | 1995 | Spring |
| 68 | 1994 | Winter |
| 60 | 1993 | Summer |
| 46 | 1992 | Summer |
| 40 | 1991 | Summer |
| Country Island Complex (NS028) | ||
|---|---|---|
| Number | Year | Season |
| 4 | 2021 | Summer |
| 4 - 8 | 2018 | Summer |
| 3 | 2010 | Summer |
| 108 | 2000 | Summer |
| 32 | 1999 | Summer |
| 6 | 1998 | Summer |
| 2 | 1997 | Summer |
| 90 | 1996 | Summer |
| 60 | 1993 | Summer |
| Grassy Island Complex (NS026) | ||
|---|---|---|
| Number | Year | Season |
| 2 | 2011 | Summer |
| 10 | 1998 | Summer |
| 24 | 1997 | Summer |
| 60 | 1995 | Summer |
| 40 | 1993 | Summer |
| 12 | 1985 | Summer |
| 90 | 1970 | Summer |
| South Shore (Barrington Bay Sector) (NS018) | ||
|---|---|---|
| Number | Year | Season |
| 43 | 2000 | Summer |
| Sable Island, Nova Scotia (NS025) | ||
|---|---|---|
| Number | Year | Season |
| 7 | 2021 | Summer |
| 3 | 2021 | Spring |
| 2 | 2018 | Summer |
| 3 - 6 | 2017 | Summer |
| 2 | 2017 | Spring |
| 15 | 2009 | Other |
| 10 | 2008 | Other |
| 4 | 2007 | Other |
| 1 | 1998 | Summer |
| 2 | 1997 | Summer |
| 6 | 1994 | Summer |
| 8 | 1993 | Summer |
| 20 | 1985 | Summer |
| 30 | 1980 | Summer |
| Eastern Cape Sable Island (NS016) | ||
|---|---|---|
| Number | Year | Season |
| 3 - 6 | 2021 | Fall |
| 3 - 31 | 2021 | Summer |
| 2 | 2021 | Spring |
| 2 - 20 | 2020 | Fall |
| 2 | 2020 | Summer |
| 2 - 3 | 2019 | Summer |
| 2 | 2019 | Spring |
| 2 | 2018 | Summer |
| 3 | 2018 | Spring |
| 2 - 8 | 2017 | Fall |
| 5 - 14 | 2017 | Summer |
| 2 | 2016 | Fall |
| 2 - 3 | 2016 | Summer |
| 2 | 2013 | Summer |
| 2 | 1998 | Summer |
| 2 | 1997 | Summer |
| Île Paquet (QC022) | ||
|---|---|---|
| Number | Year | Season |
| 2 - 4 | 2000 | Summer |
| 2 - 4 | 1999 | Summer |
| 2 | 1998 | Summer |
| 2 - 3 | 1996 | Summer |
| 2 | 1996 | Spring |
| 1 - 2 | 1995 | Summer |
| 1 | 1995 | Spring |
| 2 | 1993 | Summer |
| 2 - 4 | 1993 | Spring |
| 2 - 3 | 1992 | Summer |
| 2 | 1992 | Spring |
| 1 - 4 | 1991 | Summer |
| 1 - 4 | 1991 | Spring |
| 2 | 1990 | Fall |
| 2 - 3 | 1990 | Summer |
| 1 - 2 | 1989 | Fall |
| 1 - 2 | 1989 | Summer |
| 2 | 1989 | Spring |
| 1 - 7 | 1988 | Fall |
| 6 | 1988 | Summer |
| Machias Seal Island (NB019) | ||
|---|---|---|
| Number | Year | Season |
| 2 - 5 | 1996 | Summer |
| 4 | 1995 | Summer |
| 2 | 1994 | Summer |
| South Shore (Port Joli sector) (NS004) | ||
|---|---|---|
| Number | Year | Season |
| 2 - 5 | 2008 | Spring |
| La Pointe (QC013) | ||
|---|---|---|
| Number | Year | Season |
| 2 | 2001 | Summer |
| 2 | 2001 | Spring |
| 3 | 2000 | Summer |
| 2 | 1998 | Summer |
| 2 - 3 | 1997 | Summer |
| 2 - 3 | 1996 | Summer |
| 2 | 1996 | Spring |
| 2 | 1995 | Summer |
| 2 | 1993 | Summer |
| 2 - 4 | 1993 | Spring |
| 2 - 3 | 1992 | Summer |
| 2 | 1992 | Spring |
| 4 | 1991 | Spring |
| 2 | 1990 | Fall |
| 2 - 3 | 1990 | Summer |
| Bassin aux Huîtres (QC015) | ||
|---|---|---|
| Number | Year | Season |
| 2 | 1998 | Fall |
| 2 - 3 | 1993 | Summer |
| 2 | 1993 | Spring |
| 2 | 1990 | Summer |
| Lagune du Havre aux Basques et plage de l'Ouest (QC003) | ||
|---|---|---|
| Number | Year | Season |
| 2 | 1984 | Summer |
| 2 | 1983 | Summer |
| 2 - 3 | 1982 | Fall |
| 2 | 1982 | Summer |
| 1 | 1971 | Summer |
| Bon Portage Island (NS015) | ||
|---|---|---|
| Number | Year | Season |
| 2 | 2015 | Summer |
| Îlot C (QC026) | ||
|---|---|---|
| Number | Year | Season |
| 1 | 1995 | Spring |
| 2 | 1994 | Summer |
| 2 | 1990 | Winter |
| 2 | 1990 | Summer |
| South Shore (Roseway to Baccaro) (NS017) | ||
|---|---|---|
| Number | Year | Season |
| 2 | 2019 | Summer |