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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

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