Annual index results for Ontario (Lower Great Lakes / St. Lawrence Plain (BCR 13))

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 (Lower Great Lakes / St. Lawrence Plain (BCR 13))
Year Annual index Lower limit Upper limit
1970 54.8 46.7 65.3
1971 57.7 49.7 67.8
1972 58.8 50.4 69.2
1973 60.7 52.5 71.3
1974 60.8 52.8 71.3
1975 59 51.2 68.3
1976 59.1 51.7 68.6
1977 58.7 51.3 67.9
1978 59.6 52.6 68.6
1979 61.3 53.8 70.3
1980 62.7 54.8 72.1
1981 64.3 56.3 73.7
1982 63.6 56.2 72.6
1983 60.5 53.6 68.4
1984 57.1 50.8 64.3
1985 53.2 47.3 59.8
1986 50 44.6 55.7
1987 47.1 42.1 52.6
1988 44.6 40 50
1989 43.1 38.6 48.1
1990 41.5 37.2 46
1991 40.4 36.6 44.9
1992 39.9 36 44.3
1993 40.1 36.3 44.5
1994 41.3 37.6 45.3
1995 41.4 37.7 45.5
1996 40.6 36.9 44.7
1997 39.4 35.8 43.6
1998 36.3 33 40
1999 34 30.8 37.5
2000 32 29.1 35.4
2001 30.3 27.5 33.5
2002 29.1 26.4 32.2
2003 28.2 25.6 31.2
2004 26.8 24.1 29.8
2005 25.2 22.7 27.9
2006 23.7 21.4 26.1
2007 22.6 20.3 24.8
2008 21.8 19.7 24
2009 21 19.1 23.1
2010 20.3 18.4 22.4
2011 20.2 18.3 22.3
2012 19.3 17.5 21.5
2013 18.3 16.5 20.1
2014 17.5 15.9 19.3
2015 16.2 14.6 17.9
2016 15 13.6 16.6
2017 13.6 12.2 15.1
2018 12.1 10.7 13.6
2019 11 9.67 12.7

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 (Lower Great Lakes / St. Lawrence Plain (BCR 13))

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Ontario (Lower Great Lakes / St. Lawrence Plain (BCR 13)), 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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