Annual index results for British Columbia (Northern Rockies (BCR 10))

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 (Northern Rockies (BCR 10))

Year	Annual index	Lower limit	Upper limit
1970	0.0718	0.0267	0.13
1971	0.0718	0.0274	0.124
1972	0.0679	0.029	0.115
1973	0.0732	0.0354	0.12
1974	0.0732	0.0347	0.116
1975	0.0793	0.0384	0.125
1976	0.088	0.0462	0.142
1977	0.0958	0.0468	0.148
1978	0.11	0.0615	0.171
1979	0.125	0.0708	0.187
1980	0.155	0.0941	0.23
1981	0.184	0.115	0.276
1982	0.205	0.122	0.301
1983	0.207	0.123	0.305
1984	0.237	0.141	0.35
1985	0.226	0.135	0.325
1986	0.219	0.129	0.328
1987	0.231	0.149	0.348
1988	0.224	0.127	0.331
1989	0.187	0.113	0.28
1990	0.182	0.104	0.269
1991	0.177	0.0958	0.263
1992	0.176	0.097	0.26
1993	0.186	0.109	0.275
1994	0.199	0.121	0.295
1995	0.194	0.112	0.283
1996	0.2	0.124	0.301
1997	0.2	0.124	0.298
1998	0.209	0.124	0.309
1999	0.209	0.13	0.305
2000	0.197	0.115	0.296
2001	0.183	0.101	0.283
2002	0.201	0.118	0.296
2003	0.187	0.106	0.282
2004	0.162	0.0889	0.245
2005	0.168	0.102	0.255
2006	0.139	0.0777	0.206
2007	0.122	0.0705	0.185
2008	0.103	0.0586	0.155
2009	0.101	0.0567	0.152
2010	0.0862	0.0478	0.132
2011	0.0717	0.0364	0.111
2012	0.0672	0.0321	0.111
2013	0.0541	0.0242	0.0916
2014	0.0472	0.0194	0.0797
2015	0.0384	0.0152	0.0674
2016	0.0359	0.0107	0.0636
2017	0.0294	0.00771	0.0559
2018	0.0254	0.00542	0.0511
2019	0.0227	0.00372	0.047
2020	0.0198	0.00357	0.0443
2021	0.0174	0.00187	0.04

Geographic area included in the Long-term trend for the 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 (Northern Rockies (BCR 10))

• British Columbia (Northern Rockies (BCR 10))

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