Annual index results for Alberta (Prairie Potholes (BCR 11))

Annual index graph for: Bobolink

Note: the range of the vertical axis has been scaled to highlight pattern in the annual indices. If estimates are imprecise, the graph may not include the upper credible limits.

View definitions of the annual index table columns.

Annual indices for Bobolink in Alberta (Prairie Potholes (BCR 11))
Year Annual index Lower limit Upper limit
1970 0.212 0.0432 0.821
1971 0.211 0.056 0.719
1972 0.235 0.0964 0.555
1973 0.208 0.0783 0.526
1974 0.134 0.0375 0.343
1975 0.174 0.0643 0.471
1976 0.136 0.0439 0.346
1977 0.13 0.045 0.334
1978 0.113 0.0327 0.298
1979 0.135 0.0479 0.343
1980 0.175 0.0644 0.552
1981 0.098 0.0295 0.241
1982 0.114 0.0418 0.292
1983 0.0955 0.028 0.255
1984 0.103 0.0359 0.264
1985 0.0957 0.0336 0.263
1986 0.0776 0.0244 0.201
1987 0.0686 0.021 0.176
1988 0.0651 0.0202 0.171
1989 0.102 0.0401 0.289
1990 0.0713 0.0292 0.174
1991 0.0611 0.0222 0.147
1992 0.0834 0.0364 0.216
1993 0.0581 0.0223 0.135
1994 0.0521 0.0185 0.123
1995 0.0587 0.0228 0.132
1996 0.077 0.0324 0.183
1997 0.0466 0.0147 0.11
1998 0.0553 0.0196 0.138
1999 0.0452 0.0141 0.108
2000 0.0499 0.0169 0.12
2001 0.0587 0.0217 0.142
2002 0.0471 0.0148 0.116
2003 0.0551 0.0193 0.131
2004 0.0643 0.0245 0.151
2005 0.0582 0.0212 0.135
2006 0.0898 0.0384 0.218
2007 0.0821 0.0343 0.188
2008 0.109 0.0473 0.253
2009 0.0722 0.0273 0.162
2010 0.0718 0.0244 0.163
2011 0.0914 0.0373 0.208
2012 0.0969 0.0385 0.211
2013 0.126 0.056 0.272
2014 0.166 0.0727 0.413
2015 0.142 0.0588 0.308
2016 0.139 0.0532 0.312
2017 0.321 0.156 0.715
2018 0.399 0.207 0.812
2019 0.139 0.053 0.335

Geographic area included in the Long-term trend for the Bobolink

Map displaying regions covered by analysis of species: Bobolink
      Coloured = Regions (analytical strata) included in trend estimate. The colour of the region reflects the approximate population trend in the region. The categories of trends based on the %/year values are indicated in the legend on the right, and the specific values can be found by searching on the analytical stratum trends for the same time-period and species.
      White = Regions not included in trend estimate

Bird Conservation Regions (BCR) with data included in Long-term trend estimates for Alberta (Prairie Potholes (BCR 11))

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Alberta (Prairie Potholes (BCR 11)), but included in short-term estimates

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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