Annual index results for Boreal Softwood Shield (BCR 8)

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 Boreal Softwood Shield (BCR 8)
Year Annual index Lower limit Upper limit
1970 0.572 0.285 1.23
1971 0.582 0.308 1.17
1972 0.604 0.333 1.14
1973 0.655 0.398 1.2
1974 0.64 0.389 1.16
1975 0.675 0.4 1.21
1976 0.645 0.408 1.11
1977 0.687 0.441 1.19
1978 0.712 0.464 1.24
1979 0.714 0.459 1.21
1980 0.717 0.464 1.22
1981 0.783 0.51 1.35
1982 0.794 0.512 1.39
1983 0.701 0.442 1.24
1984 0.684 0.435 1.19
1985 0.646 0.404 1.13
1986 0.608 0.386 1.05
1987 0.584 0.373 0.993
1988 0.539 0.34 0.918
1989 0.506 0.324 0.862
1990 0.496 0.311 0.844
1991 0.492 0.314 0.82
1992 0.481 0.304 0.814
1993 0.483 0.304 0.802
1994 0.496 0.311 0.837
1995 0.511 0.319 0.855
1996 0.536 0.335 0.918
1997 0.518 0.325 0.877
1998 0.519 0.327 0.883
1999 0.492 0.304 0.853
2000 0.468 0.283 0.797
2001 0.491 0.306 0.845
2002 0.486 0.298 0.82
2003 0.488 0.299 0.838
2004 0.492 0.301 0.85
2005 0.488 0.303 0.842
2006 0.479 0.292 0.822
2007 0.469 0.288 0.804
2008 0.458 0.284 0.794
2009 0.46 0.291 0.818
2010 0.426 0.26 0.735
2011 0.433 0.265 0.791
2012 0.426 0.263 0.789
2013 0.391 0.241 0.723
2014 0.396 0.241 0.769
2015 0.379 0.228 0.786
2016 0.372 0.217 0.765
2017 0.34 0.184 0.743
2018 0.328 0.167 0.763
2019 0.326 0.161 0.768

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 Boreal Softwood Shield (BCR 8)

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Boreal Softwood Shield (BCR 8), 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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