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Table 3 Mean number of birds and Pearson’s correlations between disturbance and abundance of birds in different vertical strata of the forest

From: Response of tropical avifauna to visitor recreational disturbances: a case study from the Sinharaja World Heritage Forest, Sri Lanka

Distance from trail (m)

Strata

Mean number of birds

Pearson’s correlation

NRD

LRD

MRD

HRD

r

p

0

Ground and understory

2.77

2.20

1.23

0.16

−0.230

0.001*

Sub-canopy

2.92

2.28

0.97

0.41

−0.212

0.001*

Canopy

1.58

1.88

1.22

1.13

−0.116

0.141

Above-canopy

1.41

1.54

0.80

1.10

−0.150

0.233

75

Ground and understory

1.52

1.25

1.00

3.00

0.202

0.218

Sub-canopy

1.86

1.76

1.83

3.83

0.263

0.019*

Canopy

4.60

1.50

3.50

1.99

−0.289

0.451

Above-canopy

2.00

2.67

3.00

2.00

0.186

0.474

150

Ground and understory

3.29

4.33

4.83

3.50

0.087

0.492

Sub-canopy

3.29

4.22

4.05

1.36

0.004

0.958

Canopy

2.33

2.94

1.67

1.00

−0.062

0.733

Above-canopy

1.64

2.22

0.67

1.50

−0.114

0.563

  1. * Statistical significance at α = 0.05 level