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Table 1 Mean ± SE of habitat variables for Dicrurus hottentottus at nesting and random locations in Dongzhai National Nature Reserve, Henan, China in 2011

From: Evaluation of nest site preferences of a nest dismantler, the Hair-crested Drongo (Dicrurus hottentottus) in Dongzhai National Nature Reserve of central China

Variable

Nest site

Random site

t

P

Tree height (m)

18.9 ± 1.03

9.91 ± 0.84

7.73

0.000

Live crown ratio

60.58 ± 2.57

43.71 ± 2.95

3.85

0.000

Diameter at breast height (cm)

33.45 ± 2.01

16.36 ± 1.85

6.49

0.000

Tree rank

2.73 ± 0.07

1.96 ± 0.10

6.30

0.000

Canopy cover (%)

79.89 ± 2.11

79.16 ± 3.03

0.23

0.819

Slope (°)

15.24 ± 1.68

27.50 ± 2.01

−4.56

0.000

Aspect N

0.04 ± 0.10

−0.05 ± 0.10

0.63

0.535

Aspect E

-0.15 ± 0.10

−0.03 ± 0.11

−0.79

0.432

Azimuth N

-0.02 ± 0.10

0.02 ± 0.10

−0.33

0.742

Azimuth E

0.05 ± 0.10

−0.04 ± 0.10

0.63

0.535

Herbaceous (%)

39.23 ± 2.38

32.89 ± 3.04

1.75

0.086

Wood (%)

13.73 ± 1.82

14.04 ± 1.84

−0.13

0.900

Bare ground (%)

6.53 ± 1.44

6.32 ± 1.70

0.08

0.935

Litter (%)

31.78 + 2.01

40.03 ± 2.88

−2.69

0.010

Rock (%)

4.1 ± 1.02

4.69 ± 1.15

−0.44

0.662

Coarse woody debris (%)

1.96 ± 0.46

2.32 ± 0.48

−0.54

0.593

Water (%)

1.64 ± 0.92

0.02 ± 0.02

1.76

0.085

Litter depth (cm)

2.64 ± 0.19

3.22 ± 0.22

−2.35

0.023

Ground cover

0.96 ± 0.01

0.96 ± 0.02

−0.20

0.844

Understory

0.35 ± 0.04

0.48 ± 0.05

−2.58

0.013

Midstory

0.4 ± 0.04

0.65 ± 0.04

−4.21

0.000

Overstory

0.7 ± 0.04

0.46 ± 0.05

4.53

0.000

Basal area (m2/ha)

11.16 ± 1.13

8.90 ± 0.87

1.55

0.129

Trees per hectare

29.92 ± 4.24

79.63 ± 10.30

−4.60

0.000