Population status

Mourning Warbler
(Geothlypis philadelphia)

The Breeding Bird Survey (BBS) is the most reliable source of data for the Mourning Warbler, providing good coverage of about 50% of the Canadian breeding population. The population has decreased by about 50% since 1970. At the regional level, the decrease is consistent throughout most Bird Conservation Regions (BCRs) in Canada, with the exception of the Lower Great Lakes / St. Lawrence Plain BCR, which shows little change in population since about 1970 (BCRs for which there are reasonably reliable BBS trends are displayed below). The Atlas of the Breeding Birds of Ontario, which provides results for the portion of the population in Ontario, indicates little change in occurrence over the 20-year period spanned by the two Atlases.

Breeding Bird Survey (BBS) - Canadian analysis

Additional information on: Breeding Bird Survey (BBS) - Canadian analysis

View definitions of table column headings being used by: Breeding Bird Survey (BBS) - Canadian analysis

Table 1: Population trends by geographic area
Geographic area	Time Period ^{Table 1 - footnote 1}	Annual trend ^{Table 1 - footnote 2}	Intervals ^{Table 1 - footnote3}
Geographic area	Time Period ^{Table 1 - footnote 1}	Annual trend ^{Table 1 - footnote 2}	Lower	Upper
Canada Select to view graph of the geographic area: Canada 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	-1.8	-2.5	-1
Boreal Taiga Plains Select to view graph of the geographic area: Boreal Taiga Plains 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	-2.3	-3.5	-1.2
Boreal Softwood Shield Select to view graph of the geographic area: Boreal Softwood Shield 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	-1.6	-2.9	-0.4
Boreal Hardwood Transition Select to view graph of the geographic area: Boreal Hardwood Transition 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	-1.4	-1.9	-0.9
Lower Great Lakes / St. Lawrence Plain Select to view graph of the geographic area: Lower Great Lakes / St. Lawrence Plain 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	0	-1.1	1.2
Atlantic Northern Forest Select to view graph of the geographic area: Atlantic Northern Forest 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	-2.4	-3.4	-1.3

Atlas of the Breeding Birds of Ontario

Additional information on: Atlas of the Breeding Birds of Ontario

View definitions of table column headings being used by: Atlas of the Breeding Birds of Ontario

Table 2: Population trends by geographic area
Geographic area	Time Period	Annual trend (%) ^{Table 2 - footnote 1}	Limits
Geographic area	Time Period	Annual trend (%) ^{Table 2 - footnote 1}	Lower	Upper
Ontario	1981/85 - 2001/05	0.3	-0.8	1.3

References

Pitocchelli, J. 2011. Mourning Warbler (Geothlypis philadelphia), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. Pitocchelli, J. 2011. Mourning Warbler (Geothlypis philadelphia), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. (Link)