Annual index results for Manitoba (Prairie Potholes (BCR 11))

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 (Prairie Potholes (BCR 11))
Year Annual index Lower limit Upper limit
1970 13.3 9.7 17.5
1971 14.1 10.5 18.4
1972 14.5 10.9 18.6
1973 14.5 10.8 18.7
1974 15.1 11.3 19.3
1975 15.5 11.8 19.6
1976 15.7 12.1 19.8
1977 16.1 12.2 20
1978 16 12.6 19.9
1979 15.6 12.3 19.1
1980 14.9 11.5 18.4
1981 16 12.8 19.4
1982 15.4 12 18.6
1983 15.1 12.1 18.4
1984 15 12.1 18.2
1985 14.4 11.6 17.3
1986 13 10.4 15.7
1987 12.8 10.3 15.2
1988 12.2 9.9 14.8
1989 11.5 9.22 13.5
1990 11.9 9.84 14.1
1991 12.6 10.2 15.3
1992 11.4 9.44 13.4
1993 11.6 9.7 13.6
1994 11.5 9.56 13.6
1995 11.1 9.33 13.1
1996 11.2 9.4 13.1
1997 11 9.3 12.7
1998 10.7 9.02 12.5
1999 11.1 9.47 12.9
2000 10.4 8.8 12.1
2001 11.2 9.64 12.9
2002 10.9 9.25 12.4
2003 11.2 9.73 12.9
2004 11.2 9.78 13
2005 11.1 9.67 13
2006 11 9.39 12.6
2007 11.3 9.71 13.1
2008 10.5 8.97 11.9
2009 9.81 8.31 11.1
2010 9.61 8.31 11
2011 9.4 8.16 10.8
2012 9.02 7.71 10.3
2013 8.76 7.59 10.1
2014 8.14 6.94 9.29
2015 7.57 6.48 8.65
2016 7.06 6.11 8.21
2017 6.46 5.5 7.51
2018 6.21 5.2 7.17
2019 5.74 4.82 6.77
2020 5.28 4.13 6.37
2021 4.82 3.87 5.86

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 (Prairie Potholes (BCR 11))

This web site may be cited as: Smith, A.C., Hudson, M-A.R. Aponte, V.I., English, W.B., and Francis, C.M. 2023. North American Breeding Bird Survey - Canadian Trends Website, Data-version 2021. 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: