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Table 4 General linear model of Sqrt(focal shorebird abundance)

From: Temporal and spatial variation in bird and human use of beaches in southern California

Independent variable

Effect

df

 SS

F Ratio

 P

Intercept

5.49

   

<.0001

Slope

−0.24

1

56.34

5.50

0.0196

Month

 

11

612.89

5.44

<.0001

Year

 

3

10.67

0.35

0.7914

Sqrt(% algal wrack)

0.04

1

1.41

0.14

0.7109

Sqrt(Distance to estuary)

−0.02

1

119.55

11.67

0.0007

Sqrt(Human activity)

−0.12

1

42.02

4.10

0.0436

Tide

−0.11

1

3.94

0.38

0.5355

Month*Tide

 

11

636.98

5.65

<.0001

Tide*Slope

−0.02

1

0.74

0.07

0.7879

# observers

 

1

45.30

4.42

0.0362

G

 

1

84.15

8.21

0.0044

W

 

1

97.72

9.54

0.0022

F

 

1

56.43

5.51

0.0195

K

 

1

50.72

4.95

0.0267

T

 

1

57.68

5.63

0.0182

N

 

1

16.28

1.59

0.2083

C

 

1

30.82

3.01

0.0837

B

 

1

0.02

0.00

0.965

  1. R-square = 0.41, F40,379 = 6.84, P <.0001. Estuary refers to the inverse of the shortest distance from the transect to an estuary. Letter codes refer to observers.