INSTITUTE FOR BIRD POPULATIONS / NBII BIRD CONSERVATION NODE
BETWEEN-YEAR CHANGES IN MAPS ADULT POPULATION SIZE AND PRODUCTIVITY INDICES

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This form provides a web-based query interface to regional1 between-year changes2 in the numbers of adult and young individuals captured and in the reproductive index (young/adult) for 144 species3 and all species pooled (excluding gallinaceous birds and hummingbirds) of North American landbirds at stations run comparably during both years of the two-year comparison (e.g., 1997-1998).
 
Please select a demographic parameter, region, species, and year comparison(s) below*:
Number of Adults      Number of Young and Reproductive Index
Select a Region1:
 Select a Species3:
Select one or more year comparisons below, or select "All Years" to view
between-year changes from all eleven comparisons:

1992-1993 1996-1997 2000-2001
1993-1994 1997-1998 2001-2002
1994-1995 1998-1999 2002-2003
1995-1996 1999-2000
 
    All Years  
*NOTE: You may view any number of between-year changes, from a single comparison to all eleven comparisons, for a single region and species combination. If you select a single species in a single region, all between-year comparisons will be shown on the same results page. Otherwise, you may view multiple between-year comparisons by running a single query then clicking the link at the bottom of the results page to view the other between-year comparisons. You may also view data from one species in all regions, or all species in one region.
1  Region codes identify the MAPS Region in which the station is located. Data from stations in the Alaska Region (AK) and the Boreal & Arctic Canada Region (B&AC) were pooled into a single super-region, Alaska and Boreal & Arctic Canada Regions (AK/B&AC) for the calculation of adult population size and productivity analyses. The region codes are: AK/B&AC = Alaska and Boreal & Arctic Canada Regions, NW = Northwest Region, SW = Southwest Region, NC = North-central Region, SC = South-central Region, NE = Northeast Region, SE = Southeast Region. See the NBII MAPS Home Page for a map of the Regions.
2  Between-year changes were calculated in a rigorous constant-effort manner using net-opening and -closing times and net-run times on a net-by-net and period-by-period basis to exclude captures that occurred in a given net in a given period in one year at a time when that net was not operated in that period in the other year.
3  Species are those which were captured at two or more stations in the region and for which 50 or more aged individuals were captured in either year of the comparison. For each species, data were included from all stations that lie within the breeding range of the species; data from stations lying outside the breeding range of the species are not included in these adult population size and productivity analyses.
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