Annual index results for Alberta

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

Year	Annual index	Lower limit	Upper limit
1970	0.33	0.0269	0.934
1971	0.322	0.048	0.77
1972	0.604	0.206	1.11
1973	0.363	0.118	0.702
1974	0.161	0.0239	0.358
1975	0.284	0.0787	0.577
1976	0.19	0.029	0.412
1977	0.184	0.0291	0.419
1978	0.139	0.0207	0.325
1979	0.199	0.0436	0.426
1980	0.412	0.109	0.839
1981	0.102	0.0126	0.228
1982	0.134	0.027	0.3
1983	0.109	0.0124	0.244
1984	0.134	0.0259	0.292
1985	0.118	0.0201	0.261
1986	0.0805	0.0104	0.182
1987	0.0707	0.0115	0.163
1988	0.067	0.00686	0.148
1989	0.168	0.048	0.35
1990	0.0971	0.0267	0.191
1991	0.0762	0.0217	0.159
1992	0.129	0.0462	0.258
1993	0.0625	0.0157	0.122
1994	0.0498	0.0145	0.105
1995	0.0518	0.0129	0.0975
1996	0.0897	0.0267	0.176
1997	0.0344	0.00489	0.0696
1998	0.05	0.00805	0.109
1999	0.0351	0.00481	0.0738
2000	0.0428	0.00926	0.0839
2001	0.0573	0.0173	0.117
2002	0.0342	0.00664	0.0706
2003	0.0418	0.0112	0.0865
2004	0.0523	0.0173	0.104
2005	0.0418	0.0102	0.0796
2006	0.0914	0.0348	0.164
2007	0.0713	0.027	0.13
2008	0.108	0.045	0.187
2009	0.0538	0.017	0.102
2010	0.0498	0.0111	0.0986
2011	0.101	0.0376	0.175
2012	0.0721	0.0186	0.128
2013	0.119	0.0495	0.205
2014	0.243	0.111	0.408
2015	0.105	0.0332	0.187
2016	0.0841	0.0271	0.153
2017	0.276	0.168	0.404
2018	0.265	0.158	0.401
2019	0.0607	0.0226	0.107
2020	0.149	0.00769	0.383
2021	0.209	0.0918	0.372

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 Alberta

• Alberta (Prairie Potholes (BCR 11))

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