Trend results for Bobolink

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 Bobolink 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 1970-2019 -2.63 -2.99 -2.27 High 512 0.816 0.996 0.722 1 0 -72.9 -77.4 -67.5 1 0 0 0 0 0
Alberta; Long-term 1970-2019 0.408 -2.3 3.3 Medium 37 0.824 1 5.6 0.386 0.614 22.1 -68 391 0.087 0.148 0.151 0.164 0.207 0.242
British Columbia; Long-term 1970-2019 -4.6 -7.47 -1.72 Medium 18 0.371 1 5.75 0.999 0.001 -90 -97.8 -57.3 0.984 0.013 0.002 0.001 0 0
Manitoba; Long-term 1970-2019 -1.95 -2.83 -1.1 High 57 0.835 1 1.73 1 0 -61.9 -75.6 -41.9 0.901 0.097 0.002 0 0 0
New Brunswick; Long-term 1970-2019 -3.63 -4.33 -2.89 High 41 0.985 1 1.45 1 0 -83.7 -88.6 -76.2 1 0 0 0 0 0
Newfoundland and Labrador; Long-term 1970-2019 -4.52 -10.1 1.01 Low 5 0.779 0.78 11.1 0.944 0.056 -89.6 -99.5 64 0.868 0.052 0.024 0.021 0.018 0.017
Nova Scotia and Prince Edward Island; Long-term 1970-2019 -4.56 -5.32 -3.83 High 33 0.982 1 1.49 1 0 -89.9 -93.1 -85.2 1 0 0 0 0 0
Ontario; Long-term 1970-2019 -2.75 -3.13 -2.36 High 135 0.856 1 0.776 1 0 -74.5 -79 -68.9 1 0 0 0 0 0
Québec; Long-term 1970-2019 -3.82 -4.53 -2.88 High 108 0.708 1 1.65 1 0 -85.2 -89.7 -76.1 1 0 0 0 0 0
Saskatchewan; Long-term 1970-2019 1.11 -1.25 2.68 Medium 78 0.748 1 3.93 0.139 0.861 71.6 -46.1 265 0.018 0.044 0.077 0.162 0.344 0.356
Boreal Taiga Plains (BCR 6); Long-term 1970-2019 -3.6 -5.36 -2.07 High 28 0.674 1 3.29 1 0 -83.4 -93.3 -64.1 0.997 0.003 0 0 0 0
Boreal Softwood Shield (BCR 8); Long-term 1970-2019 -1.23 -3.5 1.25 Medium 29 0.357 0.98 4.75 0.835 0.165 -45.4 -82.6 83.7 0.434 0.265 0.136 0.089 0.058 0.018
Great Basin (BCR 9); Long-term 1970-2019 -8.74 -13.2 -4.72 Low 10 0.744 1 8.49 1 0 -98.9 -99.9 -90.6 1 0 0 0 0 0
Northern Rockies (BCR 10); Long-term 1970-2019 -1.95 -5.19 1.48 Medium 8 0.306 1 6.67 0.874 0.126 -61.9 -92.7 105 0.625 0.162 0.087 0.057 0.041 0.029
Prairie Potholes (BCR 11); Long-term 1970-2019 0.684 -0.234 1.58 High 139 0.84 1 1.81 0.074 0.926 39.6 -10.8 115 0 0.004 0.07 0.343 0.528 0.054
Boreal Hardwood Transition (BCR 12); Long-term 1970-2019 -2.71 -3.46 -2.05 High 88 0.63 1 1.4 1 0 -74 -82.2 -63.8 1 0 0 0 0 0
Lower Great Lakes / St. Lawrence Plain (BCR 13); Long-term 1970-2019 -3.82 -4.22 -3.45 High 98 0.976 1 0.772 1 0 -85.1 -87.9 -82.1 1 0 0 0 0 0
Atlantic Northern Forest (BCR 14); Long-term 1970-2019 -3.8 -4.43 -3.19 High 112 0.916 1 1.24 1 0 -85 -89.1 -79.6 1 0 0 0 0 0
Alberta (Prairie Potholes (BCR 11)); Long-term 1970-2019 0.408 -2.3 3.3 Medium 37 0.824 1 5.6 0.386 0.614 22.1 -68 391 0.087 0.148 0.151 0.164 0.207 0.242
British Columbia (Great Basin (BCR 9)); Long-term 1970-2019 -8.74 -13.2 -4.72 Low 10 0.744 1 8.49 1 0 -98.9 -99.9 -90.6 1 0 0 0 0 0
British Columbia (Northern Rockies (BCR 10)); Long-term 1970-2019 -1.95 -5.19 1.48 Medium 8 0.306 1 6.67 0.874 0.126 -61.9 -92.7 105 0.625 0.162 0.087 0.057 0.041 0.029
Manitoba (Boreal Taiga Plains (BCR 6)); Long-term 1970-2019 -2.96 -4.48 -1.43 High 15 0.699 1 3.06 1 0 -77 -89.4 -50.5 0.976 0.022 0.001 0 0 0
Manitoba (Prairie Potholes (BCR 11)); Long-term 1970-2019 -1.09 -2.23 0.022 High 37 0.9 1 2.25 0.973 0.027 -41.5 -66.9 1.08 0.296 0.51 0.167 0.026 0.001 0
Manitoba (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2019 -3.15 -4.95 -1.29 Medium 5 0.614 1 3.66 1 0 -79.2 -91.7 -47.2 0.968 0.03 0.002 0 0 0
New Brunswick (Atlantic Northern Forest (BCR 14)); Long-term 1970-2019 -3.63 -4.33 -2.89 High 41 0.985 1 1.45 1 0 -83.7 -88.6 -76.2 1 0 0 0 0 0
Newfoundland and Labrador (Boreal Softwood Shield (BCR 8)); Long-term 1970-2019 -4.52 -10.1 1.01 Low 5 0.779 0.78 11.1 0.944 0.056 -89.6 -99.5 64 0.868 0.052 0.024 0.021 0.018 0.017
Ontario (Boreal Softwood Shield (BCR 8)); Long-term 1970-2019 -1.15 -4.37 2.41 Medium 7 0.442 1 6.78 0.742 0.258 -43.4 -88.8 221 0.439 0.179 0.123 0.094 0.091 0.073
Ontario (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2019 -1.7 -2.43 -0.983 High 53 0.634 1 1.45 1 0 -56.9 -70 -38.4 0.793 0.204 0.002 0 0 0
Ontario (Lower Great Lakes / St. Lawrence Plain (BCR 13)); Long-term 1970-2019 -3.22 -3.7 -2.78 High 75 0.982 1 0.921 1 0 -79.9 -84.2 -74.9 1 0 0 0 0 0
Québec (Boreal Softwood Shield (BCR 8)); Long-term 1970-2019 -1.08 -3.82 1.82 Medium 17 0.35 1 5.64 0.766 0.234 -41.2 -85.2 142 0.415 0.215 0.136 0.104 0.087 0.043
Québec (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2019 -3.73 -4.93 -2.56 High 30 0.628 1 2.38 1 0 -84.5 -91.6 -71.9 1 0 0 0 0 0
Québec (Lower Great Lakes / St. Lawrence Plain (BCR 13)); Long-term 1970-2019 -5.93 -6.72 -5.14 High 23 0.952 1 1.58 1 0 -95 -96.7 -92.5 1 0 0 0 0 0
Québec (Atlantic Northern Forest (BCR 14)); Long-term 1970-2019 -3.59 -4.83 -2.3 High 38 0.774 1 2.53 1 0 -83.3 -91.1 -67.9 0.999 0.001 0 0 0 0
Saskatchewan (Boreal Taiga Plains (BCR 6)); Long-term 1970-2019 -6.3 -11 -1.91 Low 13 0.589 1 9.05 0.998 0.002 -95.9 -99.7 -61.1 0.989 0.007 0.002 0 0.001 0
Saskatchewan (Prairie Potholes (BCR 11)); Long-term 1970-2019 2.4 0.973 3.82 High 65 0.755 1 2.84 0 1 219 60.7 527 0 0 0 0.008 0.086 0.906
Nova Scotia and Prince Edward Island (Atlantic Northern Forest (BCR 14)); Long-term 1970-2019 -4.56 -5.32 -3.83 High 33 0.982 1 1.49 1 0 -89.9 -93.1 -85.2 1 0 0 0 0 0

This web site may be cited as: Smith, A.C., Hudson, M-A.R. Aponte, V.I., and Francis, C.M. 2020. North American Breeding Bird Survey - Canadian Trends Website, Data-version 2019. 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.

  1. Smith, A. C., & Edwards, B. P. M. (2020). North American Breeding Bird Survey status and trend estimates to inform a wide range of conservation needs, using a flexible Bayesian hierarchical generalized additive model. The Condor, duaa065. https://doi.org/10.1093/ornithapp/duaa065
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