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Table 7 Ordinal linear model of gull richness

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

Independent variable

Effect

df

Chi-Square

 P

Slope

−0.13

1

4.66

0.0309

Month

 

11

40.95

<.0001

Year

 

3

4.97

0.1742

Sqrt(% algal wrack)

0.08

1

1.35

0.2447

Sqrt(Distance to estuary)

−0.01

1

2.69

0.1007

Sqrt(Human activity)

0.00

1

0.01

0.9096

Tide

−0.04

1

0.16

0.689

Month*Tide

 

11

20.03

0.0449

Tide*Slope

−0.05

1

2.07

0.1504

# observers

 

1

0.49

0.4818

G

 

1

0.00

0.9869

W

 

1

0.80

0.371

F

 

1

0.15

0.7025

K

 

1

0.11

0.7385

T

 

1

0.09

0.764

N

 

1

0.47

0.4908

C

 

1

4.89

0.027

B

 

1

1.48

0.2244

  1. R-square = 0.13, ChiSquare = 162.0 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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