Ecological Archives A015-034-A2

Megan N. Dethier and Sally D. Hacker. 2005. Physical factors vs. biotic resistance in controlling the invasion of an estuarine marsh grass. Ecological Applications 15:1273–1283.

Appendix B (Table B1). Results of two-way ANOVAs looking at site and tidal zone effects for each habitat type, in no-neighbor treatments only (see text). Tidal zones compared are listed when not all zones were included in the analysis.

Factor
High salinity marshes
Low salinity marshes
Mudflats
Cobble
 
df
MS
F
P
df
MS
F
P
df
MS
F
P
df
MS
F
P
Log seeds germinated                

Site

2

1.23

2.26

0.112

2

6.25

9.00

<0.001

2

4.69

4.99

0.009

2

1.13

2.34

0.104

Zone (all)

2

49.3

90.1

<0.001

2

0.96

1.38

0.257

2

2.27

2.42

0.096

2

2.12

4.38

0.016

Site × Zone

4

3.82

6.99

<0.001

4

2.48

3.58

0.01

4

15.6

16.6

<0.001

4

1.13

2.34

0.063

Error

77

0.548

   

77

0.695

   

77

0.938

   

73

0.484

   

R2 value

0.744

     

0.322

     

0.521

     

0.246

     
                                 

 

Mid vs. Low

Mid vs. Low

High, mid, low

Mid only

 
df
MS
F
P
df
MS
F
P
df
MS
F
P
df
MS
F
P
Log mass per plot

Site

2

10

12.3

<0.001

1

0.736

0.734

0.398

1

2.62

3.76

0.063

2

2.78

7.81

0.016

Zone

1

134

166

<0.001

1

2.83

2.82

0.103

2

10.3

14.8

<0.001

       

Site × Zone

2

16.3

20

<0.001

1

6.69

6.67

0.015

2

2.9

4.16

0.026

       

Error

41

0.81

   

30

1.00

   

28

0.697

   

7

0.357

   

R2 value

0.838

     

0.261

     

0.538

     

0.728

     
                                 

 

Mid vs. Low

Mid vs. Low

High, mid, low

Mid only

 
df
MS
F
P
df
MS
F
P
df
MS
F
P
df
MS
F
P
Log individual root mass

Site

2

0.715

3.25

0.049

1

0.001

0.003

0.958

1

1.34

5.6

0.025

2

0.903

1.32

0.326

Zone

1

53.4

243

<0.001

1

1.16

2.81

0.104

2

1.15

4.84

0.016

       

Site × Zone

2

5.87

26.7

<0.001

1

0

0

0.984

2

0.34

1.43

0.257

       

Error

41

0.22

   

30

0.412

   

28

0.238

   

7

0.684

   

R2 value

0.884

     

0.086

     

0.314

     

0.274

     



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