Annual index results for Manitoba (Boreal Hardwood Transition (BCR 12))

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 Manitoba (Boreal Hardwood Transition (BCR 12))
Year Annual index Lower limit Upper limit
1970 14.5 6.56 33.5
1971 15 6.94 33.9
1972 16.1 7.63 35.5
1973 17 8.08 37.7
1974 17.3 8.22 38.9
1975 17.6 8.31 38.6
1976 18.1 8.74 39.6
1977 18.7 8.93 40.6
1978 18.8 9.12 40.2
1979 19.1 9.36 40.8
1980 19.9 9.79 42
1981 19.8 9.98 41.7
1982 18.7 9.42 38.1
1983 17.2 8.6 34.6
1984 16.1 8.4 32.1
1985 14.5 7.69 27.8
1986 13.2 7.1 25.1
1987 12 6.65 21.9
1988 11.3 6.33 20.3
1989 10.5 6.12 18.2
1990 9.81 5.9 16.7
1991 9.34 5.83 15.3
1992 8.9 5.76 14.2
1993 8.67 5.75 13.6
1994 8.52 5.69 12.9
1995 8.62 6.08 13.2
1996 8 5.63 11.6
1997 7.81 5.63 11.1
1998 7.37 5.31 10.6
1999 7.1 5.21 10.2
2000 6.75 4.98 9.76
2001 6.5 4.76 9.34
2002 6.23 4.52 8.88
2003 6.08 4.37 8.7
2004 5.67 3.76 8.12
2005 5.7 4.13 8.15
2006 5.26 3.65 7.51
2007 5.15 3.69 7.43
2008 4.86 3.44 7.02
2009 4.86 3.48 7.07
2010 4.68 3.39 6.74
2011 4.46 3.19 6.46
2012 4.2 2.95 6.08
2013 4.02 2.87 5.71
2014 3.87 2.74 5.5
2015 3.86 2.83 5.49
2016 3.73 2.75 5.39
2017 3.47 2.47 4.96
2018 3.23 2.27 4.84
2019 2.88 1.87 4.44

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 Manitoba (Boreal Hardwood Transition (BCR 12))

Bird Conservation Regions (BCR) with data excluded from long-term trend estimates for Manitoba (Boreal Hardwood Transition (BCR 12)), 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
Back to (Trend results for Bobolink)
Date modified: