Annual index results for 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 Great Basin (BCR 9)
Year Annual index Lower limit Upper limit
1970 0.702 0.167 2.46
1971 0.731 0.222 2.5
1972 0.665 0.22 1.97
1973 0.638 0.219 1.67
1974 0.719 0.326 1.8
1975 0.615 0.288 1.44
1976 0.475 0.165 1.07
1977 0.491 0.187 1.11
1978 0.467 0.192 0.975
1979 0.471 0.219 1.03
1980 0.453 0.223 0.874
1981 0.438 0.208 0.902
1982 0.367 0.139 0.712
1983 0.342 0.144 0.672
1984 0.331 0.175 0.701
1985 0.284 0.15 0.61
1986 0.272 0.148 0.736
1987 0.205 0.089 0.418
1988 0.182 0.0836 0.363
1989 0.155 0.0625 0.304
1990 0.167 0.0906 0.446
1991 0.121 0.0437 0.238
1992 0.108 0.0379 0.219
1993 0.109 0.0565 0.22
1994 0.0874 0.0274 0.171
1995 0.0869 0.038 0.174
1996 0.0797 0.0314 0.156
1997 0.0862 0.043 0.223
1998 0.0633 0.021 0.128
1999 0.0567 0.0183 0.113
2000 0.0588 0.027 0.134
2001 0.0517 0.022 0.107
2002 0.0459 0.016 0.0914
2003 0.0456 0.0168 0.0977
2004 0.0414 0.0155 0.0876
2005 0.0381 0.0135 0.0818
2006 0.0455 0.0204 0.129
2007 0.0336 0.0115 0.0755
2008 0.0297 0.00998 0.0664
2009 0.0283 0.00917 0.0689
2010 0.0342 0.0122 0.128
2011 0.0227 0.00653 0.0573
2012 0.0242 0.00769 0.0768
2013 0.0189 0.00496 0.0568
2014 0.017 0.00387 0.0552
2015 0.0151 0.00297 0.0552
2016 0.013 0.00228 0.052
2017 0.0112 0.00161 0.0532
2018 0.00953 0.00118 0.051
2019 0.00805 0.000804 0.051

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 Great Basin (BCR 9)

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Great Basin (BCR 9), 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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