Trend results for Chimney Swift

A comprehensive assessment of this species' status is available, on the Status of Birds in Canada web site, or for waterfowl, in the most recent report on the Migratory game bird hunting.

Trend results can be filtered by selecting a new time period.


View definitions of the trend results table columns.

Select a geographic area name in the first column to view graphs of annual indices and maps of the regions included in the analysis. Use the scroll bar to view additional columns.

Long-term trend estimates for Chimney Swift in all regions of Canada
Geographic area Time period Annual trend Limits Overall reliability N routes Reliability details Probability of decrease Probability of increase Population change Population change - lower limit Population change - upper limit Probability of population change during time period
Lower Upper Geographic coverage Local data weight Precision >50% decrease 25%-50% decrease 0%-25% decrease 0%-33% increase 33%-100% increase >100% increase
Canada; Long-term 1970-2017 -4.38 -5.15 -3.62 High 227 0.73 0.759 1.53 1 0 -87.8 -91.7 -82.3 1 0 0 0 0 0
Manitoba; Long-term 1970-2017 0.721 -2.9 7.58 Low 4 0.399 0.171 10.5 0.369 0.631 40.2 -75 3010 0.126 0.129 0.114 0.108 0.14 0.383
New Brunswick; Long-term 1970-2017 -2.96 -4.39 -1.28 High 34 0.981 0.899 3.11 0.999 0.001 -75.7 -87.9 -45.4 0.961 0.036 0.002 0.001 0 0
Nova Scotia and Prince Edward Island; Long-term 1970-2017 -6.15 -7.33 -4.91 High 30 0.912 0.868 2.42 1 0 -94.9 -97.2 -90.6 1 0 0 0 0 0
Ontario; Long-term 1970-2017 -5.55 -6.59 -4.39 High 87 0.673 0.837 2.2 1 0 -93.2 -95.9 -87.9 1 0 0 0 0 0
Québec; Long-term 1970-2017 -3.83 -5.25 -2.57 High 72 0.655 0.689 2.68 1 0 -84 -92.1 -70.6 1 0 0 0 0 0
Boreal Softwood Shield (BCR 8); Long-term 1970-2017 -2.92 -6.26 1.16 Low 3 0.541 0.168 7.43 0.937 0.063 -75.2 -95.2 72.1 0.803 0.096 0.037 0.026 0.019 0.018
Prairie Potholes (BCR 11); Long-term 1970-2017 0.721 -2.9 7.58 Low 4 0.399 0.171 10.5 0.369 0.631 40.2 -75 3010 0.126 0.129 0.114 0.108 0.14 0.383
Boreal Hardwood Transition (BCR 12); Long-term 1970-2017 -5.69 -7.54 -4.03 Medium 63 0.471 0.75 3.5 1 0 -93.6 -97.5 -85.6 1 0 0 0 0 0
Lower Great Lakes / St. Lawrence Plain (BCR 13); Long-term 1970-2017 -4.07 -5.16 -3.01 High 71 0.973 0.861 2.16 1 0 -85.8 -91.7 -76.2 1 0 0 0 0 0
Atlantic Northern Forest (BCR 14); Long-term 1970-2017 -3.79 -4.71 -2.74 High 86 0.875 0.851 1.97 1 0 -83.7 -89.6 -72.9 1 0 0 0 0 0
Manitoba (Prairie Potholes (BCR 11)); Long-term 1970-2017 0.721 -2.9 7.58 Low 4 0.399 0.171 10.5 0.369 0.631 40.2 -75 3010 0.126 0.129 0.114 0.108 0.14 0.383
New Brunswick (Atlantic Northern Forest (BCR 14)); Long-term 1970-2017 -2.96 -4.39 -1.28 High 34 0.981 0.899 3.11 0.999 0.001 -75.7 -87.9 -45.4 0.961 0.036 0.002 0.001 0 0
Ontario (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2017 -7.48 -9.24 -5.74 Medium 34 0.447 0.765 3.5 1 0 -97.4 -99 -93.8 1 0 0 0 0 0
Ontario (Lower Great Lakes / St. Lawrence Plain (BCR 13)); Long-term 1970-2017 -4.49 -5.78 -3.11 High 53 0.988 0.887 2.67 1 0 -88.5 -93.9 -77.3 1 0 0 0 0 0
Québec (Boreal Softwood Shield (BCR 8)); Long-term 1970-2017 -2.92 -6.26 1.16 Low 3 0.541 0.168 7.43 0.937 0.063 -75.2 -95.2 72.1 0.803 0.096 0.037 0.026 0.019 0.018
Québec (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2017 -4.78 -7.38 -2.5 Medium 29 0.495 0.733 4.88 1 0 -90 -97.3 -69.6 0.999 0.001 0 0 0 0
Québec (Lower Great Lakes / St. Lawrence Plain (BCR 13)); Long-term 1970-2017 -3.5 -5.23 -1.77 High 18 0.943 0.83 3.46 1 0 -81.3 -92 -56.8 0.991 0.009 0.001 0 0 0
Québec (Atlantic Northern Forest (BCR 14)); Long-term 1970-2017 -2.8 -4.99 -0.703 Medium 22 0.715 0.751 4.29 0.995 0.005 -73.7 -91 -28.2 0.886 0.092 0.016 0.004 0.002 0
Nova Scotia and Prince Edward Island (Atlantic Northern Forest (BCR 14)); Long-term 1970-2017 -6.15 -7.33 -4.91 High 30 0.912 0.868 2.42 1 0 -94.9 -97.2 -90.6 1 0 0 0 0 0

This web site may be cited as: Smith, A.C., Hudson, M-A.R. Aponte, V., and Francis, C.M. 2019. North American Breeding Bird Survey - Canadian Trends Website, Data-version 2017. Environment and Climate Change Canada, Gatineau, Quebec, K1A 0H3

Any use of these BBS results for Canada should acknowledge the hundreds of skilled volunteers in Canada who have participated in the BBS over the years and those who have served as provincial or territorial coordinators for the BBS.

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