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Evaluation of the Bird Conservation Area Concept in the Northern Tallgrass Prairie Annual Report: 2000

Table 4


Table 4.  Mayfield estimates of daily nest survival (May), its standard error (SE), percentage of nests parasitized by Brown-headed Cowbirds (Cow), and sample size (N) in small and large plots in neutral and hostile landscapes, by region, in 2000.
a) Crookston Region
Species Small Large
Neutral Hostile Neutral Hostile
May ± SE Cow N May ± SE Cow N May ± SE Cow N May ± SE Cow N
Savannah Sparrow 0.94 ± 0.01 0 45 0.93 ± 0.02 1 10 0.93 ± 0.01 3 64 0.86 ± 0.03 0 19
Clay-colored Sparrow 0.77 ± 0.08 0 8 0.95 ± 0.03 0 6 0.87 ± 0.05 20 5 0.94 ± 0.04 0 6
Bobolink 0.70 ± 0.12 0 4 - 0 1 0.87 ± 0.03 0 13 0.85 ± 0.07  0 5
b) Glyndon Region
Species Small Large
Neutral Hostile Neutral Hostile
May ± SE Cow N May ± SE Cow N May ± SE Cow N May ± SE Cow N
Savannah Sparrow 0.93 ± 0.03 0 9 0.94 ± 0.04 0 3 0.88 ± 0.04 10 10 0.92 ± 0.05 0 3
Clay-colored Sparrow 0.94 ± 0.02 0 15 0.94 ± 0.02 0 16 0.92 ± 0.02 0 28 0.91 ± 0.02 3.4 34
Bobolink 0.92 ± 0.04 0 5 0.82 ± 0.07 16.6 6 0.94 ± 0.03 0 6 - 0 1
c) Sheyenne National Grassland
Species Small Large
Neutral Hostile Neutral Hostile
May ± SE Cow N May ± SE Cow N May ± SE Cow N May ± SE Cow N
Savannah Sparrow - - - - - 0 0.93 ± 0.01 39.4 33 0.93 ± 0.03 0 11
Clay-colored Sparrow - - - 0.92 ± 0.02 3.6 36 - - 0 0.91 ± 0.02 19.2 26
Bobolink - - - 0.89 ± 0.05 0 4 0.98 ± 0.02 0 10 0.80 ± 0.06 0 8

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