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Table 5 Ordinal linear model of focal shorebird richness

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

Independent variable

Effect

df

Chi-Square

 P

Slope

−0.15

1

6.24

0.0125

Month

 

11

100.13

<.0001

Year

 

3

1.52

0.6786

Sqrt(% algal wrack)

0.01

1

0.02

0.8751

Sqrt(Distance to estuary)

0.00

1

0.66

0.416

Sqrt(Human activity)

−0.14

1

11.19

0.0008

Tide

−0.15

1

2.07

0.1504

Month*Tide

 

11

8.75

0.6451

Tide*Slope

−0.06

1

3.27

0.0705

# observers

 

1

0.90

0.3417

G

 

1

2.69

0.1008

W

 

1

1.63

0.2019

F

 

1

2.30

0.1295

K

 

1

0.57

0.4514

T

 

1

0.61

0.4339

N

 

1

0.14

0.7109

C

 

1

0.19

0.6597

B

 

1

0.78

0.3759

  1. R-square = 0.15, ChiSquare = 226.5 DF = 40, P <.0001. Estuary refers to the inverse of the shortest distance from the transect to an estuary. Letter codes refer to observers. Effect sign is negative to that given in statistical output to indicate the effect of the independent variable on the dependent variable as in a General Linear Model.
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