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 |
