Annual index results for Northern Rockies (BCR 10)

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 Northern Rockies (BCR 10)
Year Annual index Lower limit Upper limit
1970 0.0363 0.0113 0.114
1971 0.0452 0.0167 0.122
1972 0.0523 0.0211 0.121
1973 0.0619 0.0289 0.132
1974 0.0709 0.0349 0.135
1975 0.0799 0.0432 0.146
1976 0.0907 0.0513 0.163
1977 0.101 0.059 0.174
1978 0.116 0.0695 0.193
1979 0.134 0.0828 0.223
1980 0.159 0.103 0.267
1981 0.183 0.117 0.307
1982 0.199 0.13 0.332
1983 0.202 0.132 0.332
1984 0.214 0.139 0.361
1985 0.207 0.134 0.349
1986 0.204 0.133 0.341
1987 0.2 0.129 0.346
1988 0.199 0.13 0.34
1989 0.186 0.119 0.304
1990 0.183 0.116 0.302
1991 0.18 0.112 0.296
1992 0.181 0.112 0.299
1993 0.188 0.12 0.309
1994 0.199 0.131 0.324
1995 0.2 0.133 0.328
1996 0.204 0.134 0.334
1997 0.2 0.134 0.327
1998 0.2 0.135 0.322
1999 0.192 0.13 0.315
2000 0.184 0.12 0.302
2001 0.176 0.112 0.282
2002 0.181 0.121 0.306
2003 0.172 0.111 0.283
2004 0.161 0.102 0.258
2005 0.158 0.103 0.273
2006 0.138 0.0876 0.231
2007 0.125 0.0772 0.206
2008 0.11 0.0662 0.184
2009 0.101 0.0616 0.179
2010 0.0875 0.0521 0.157
2011 0.0746 0.0416 0.135
2012 0.066 0.0351 0.122
2013 0.0545 0.0271 0.104
2014 0.0453 0.0212 0.092
2015 0.0366 0.016 0.0785
2016 0.0301 0.0114 0.0717
2017 0.0233 0.00765 0.0615
2018 0.018 0.00506 0.0556
2019 0.0136 0.0033 0.0489

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 Northern Rockies (BCR 10)

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Northern Rockies (BCR 10), 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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