Annual index results for Ontario (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 Ontario (Boreal Softwood Shield (BCR 8))
Year Annual index Lower limit Upper limit
1970 0.187 0.039 0.708
1971 0.201 0.0481 0.685
1972 0.201 0.0472 0.615
1973 0.249 0.0921 0.706
1974 0.193 0.0466 0.514
1975 0.318 0.125 1.16
1976 0.22 0.0858 0.494
1977 0.296 0.136 0.794
1978 0.283 0.135 0.787
1979 0.243 0.095 0.558
1980 0.227 0.0982 0.479
1981 0.276 0.132 0.651
1982 0.281 0.138 0.869
1983 0.187 0.0453 0.396
1984 0.202 0.0703 0.475
1985 0.171 0.0475 0.386
1986 0.153 0.046 0.358
1987 0.173 0.0848 0.424
1988 0.14 0.0618 0.315
1989 0.116 0.0403 0.258
1990 0.109 0.0373 0.246
1991 0.128 0.06 0.325
1992 0.0886 0.0236 0.21
1993 0.101 0.0421 0.235
1994 0.0918 0.0309 0.209
1995 0.0952 0.034 0.258
1996 0.102 0.0439 0.309
1997 0.0815 0.0246 0.214
1998 0.0938 0.0415 0.268
1999 0.0793 0.0297 0.225
2000 0.0629 0.0174 0.149
2001 0.0698 0.0231 0.198
2002 0.0663 0.021 0.178
2003 0.0661 0.0219 0.178
2004 0.0642 0.0217 0.156
2005 0.067 0.0217 0.19
2006 0.066 0.0259 0.161
2007 0.0725 0.0319 0.194
2008 0.0624 0.0211 0.148
2009 0.061 0.0187 0.143
2010 0.0663 0.026 0.155
2011 0.068 0.0207 0.17
2012 0.0874 0.0387 0.224
2013 0.073 0.0242 0.172
2014 0.0872 0.0321 0.235
2015 0.0887 0.0346 0.211
2016 0.107 0.0398 0.315
2017 0.097 0.0293 0.273
2018 0.109 0.0339 0.35
2019 0.145 0.0498 0.491

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 Ontario (Boreal Softwood Shield (BCR 8))

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Ontario (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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