Annual index results for 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 Lower Great Lakes / St. Lawrence Plain (BCR 13)
Year Annual index Lower limit Upper limit
1970 61.8 54.1 71.8
1971 65.2 57.4 75.3
1972 65.1 57 74.8
1973 64.8 56.8 74.6
1974 64.9 57 74.7
1975 63.2 55.7 72.7
1976 63 55.7 72.4
1977 61.9 54.7 70.7
1978 62.7 55.8 71.2
1979 63.9 56.8 72.2
1980 64.7 57.5 73.3
1981 66.4 58.7 74.9
1982 64.1 57.3 72.1
1983 60.7 54.2 68
1984 56.2 50.5 62.8
1985 52.8 47.1 59.1
1986 48.8 43.8 54.3
1987 44.8 40.2 49.7
1988 42 38 46.7
1989 40 36.1 44.3
1990 38.4 34.8 42.3
1991 37.2 33.8 40.9
1992 36.3 32.9 39.9
1993 36.1 32.9 39.5
1994 37 33.9 40.4
1995 36.8 33.8 40.2
1996 35.8 32.8 39.1
1997 34.7 31.8 37.9
1998 31.8 29.1 34.8
1999 29.8 27.4 32.7
2000 28 25.6 30.7
2001 26.3 24.1 28.9
2002 25.2 23.1 27.6
2003 24.3 22.2 26.7
2004 23.2 21.1 25.6
2005 21.8 19.8 23.9
2006 20.3 18.5 22.3
2007 19.5 17.7 21.4
2008 18.7 17.1 20.5
2009 18 16.5 19.6
2010 17.4 15.9 19.1
2011 17.2 15.7 19
2012 16.5 15 18.1
2013 15.5 14.1 17
2014 14.8 13.5 16.2
2015 13.6 12.5 15
2016 12.6 11.5 13.9
2017 11.5 10.4 12.7
2018 10.2 9.17 11.4
2019 9.37 8.29 10.6

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

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