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 |
