Annual index results for British Columbia (Great Basin (BCR 9))

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 British Columbia (Great Basin (BCR 9))
Year Annual index Lower limit Upper limit
1970 0.496 0.0699 1.24
1971 0.642 0.116 1.52
1972 0.54 0.0836 1.27
1973 0.493 0.0617 1.04
1974 0.794 0.27 1.49
1975 0.63 0.25 1.19
1976 0.341 0.0847 0.671
1977 0.43 0.0868 0.917
1978 0.326 0.0873 0.634
1979 0.414 0.128 0.803
1980 0.364 0.122 0.641
1981 0.349 0.128 0.644
1982 0.234 0.0667 0.462
1983 0.257 0.0632 0.49
1984 0.331 0.134 0.609
1985 0.278 0.0973 0.499
1986 0.33 0.11 0.629
1987 0.192 0.0443 0.371
1988 0.16 0.0471 0.291
1989 0.124 0.029 0.243
1990 0.234 0.0878 0.455
1991 0.0927 0.0149 0.187
1992 0.0819 0.0127 0.167
1993 0.109 0.0424 0.207
1994 0.0608 0.00981 0.123
1995 0.0711 0.0187 0.141
1996 0.0626 0.0154 0.127
1997 0.105 0.0338 0.218
1998 0.045 0.00424 0.0914
1999 0.0387 0.004 0.0804
2000 0.0566 0.0138 0.112
2001 0.0442 0.00944 0.0885
2002 0.0313 0.00559 0.0665
2003 0.0356 0.00553 0.0798
2004 0.0313 0.0067 0.0691
2005 0.0289 0.00362 0.0604
2006 0.0641 0.02 0.144
2007 0.0278 0.00326 0.0608
2008 0.0223 0.00259 0.0479
2009 0.0247 0.00255 0.0554
2010 0.064 0.0163 0.143
2011 0.0204 0.00162 0.0458
2012 0.0351 0.00624 0.0906
2013 0.0207 0.00151 0.0513
2014 0.0191 0.002 0.0468
2015 0.0191 0.00135 0.0486
2016 0.0172 0.00163 0.0422
2017 0.0173 0.000623 0.046
2018 0.016 0.00113 0.0419
2019 0.0153 0.000891 0.041
2020 0.0161 0.00067 0.0462
2021 0.015 0.00052 0.0429

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 British Columbia (Great Basin (BCR 9))

This web site may be cited as: Smith, A.C., Hudson, M-A.R. Aponte, V.I., English, W.B., and Francis, C.M. 2023. North American Breeding Bird Survey - Canadian Trends Website, Data-version 2021. 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
Back to (Trend results for Bobolink)
Date modified: