USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Evaluation of the Bird Conservation Area Concept in the Northern Tallgrass Prairie Annual Report: 1999

Table 4


Table 4.  Mayfield estimates of daily nest survival (May), its standard error (± SE), number of nests parasitized by Brown-headed Cowbirds (Cow), and sample size (N) in small and large plots in neutral and hostile landscapes, by region.

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
Clay-colored Sparrow 0.95 ± 0.02 2 12 0.94 ± 0.01 1 31 0.97 ± 0.01 0 19 0.96 ± 0.01 0 24
Savannah Sparrow 0.94 ± 0.01 2 33 0.98 ± 0.01 1 7 0.96 ± 0.01 0 70 0.97 ± 0.01 0 33
Bobolink 0.93 ± 0.03 2 10 - 0 1 0.90 ± 0.03 0 10 0.91 ± 05 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
Clay-colored Sparrow 0.97 ± 0.01 2 25 0.95 ± 0.02 0 9 0.95 ± 0.01 0 39 0.93 ± 0.01 0 46
Savannah Sparrow 0.96 ± 0.02 1 11 - - 0 0.92 ± 0.03 0 10 - 1 4
Bobolink 0.90 ± 0.04 5 8 - - 0 0.94 ± 0.03 1 10 - 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
Clay-colored Sparrow - - 0 0.93 ± 0.02 4 26 - 0 1 0.93 ± 0.01 2 29
Savannah Sparrow - - 0 - - 0 0.95 ± 0.02 4 20 0.86 ± 0.07 0 6
Bobolink - - 0 - 0 2 - 2 2 - 0 4

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/bca1999/table4.htm
Page Contact Information: Webmaster
Page Last Modified: Friday, 01-Feb-2013 18:11:39 EST
Reston, VA [vaww55]