Ecological Archives E088-052-A3

S. Korpinen, V. Jormalainen, and T. Honkanen. 2007. Effects of nutrients, herbivory, and depth on the macroalgal community in the rocky sublittoral. Ecology 88:839–852.

Appendix C. Treatment effects on macroalgal species at times not presented in the original article.

TABLE C1. Statistical analyses of the density of the green alga Cladophora glomerata in July, August, and November. The deviance and degrees of freedom express the fitting of the data to the generalized linear model (see Statistical analyses). The summary statistics are presented in Fig. C1.

 

Early July

Mid-August

Early November

Deviance / df

54 / 36

58 / 36

60 / 35

Source

df

χ2

P

χ2

p

χ2

P

Depth

1

5.48

<0.05

2.23

  0.14

10.00

<0.001

Nutrient

2

37.61

<0.0001

1.56

NS

21.93

<0.0001

Herbivory

2

6.28

<0.05

37.51

<0.0001

32.01

<0.0001

Depth × nutrient

2

11.97

<0.01

2.79

NS

3.33

NS

Depth × herbivory

2

2.36

NS

0.14

NS

2.38

NS

Nutrient × herbivory

4

25.10

<0.0001

4.08

NS

11.66

<0.05

Nutrient × herbivory × depth

4

2.86

NS

1.52

NS

16.50

<0.01



TABLE C2. Statistical analyses of the density of the filamentous brown algae (Pilayella littoralis and Ectocarpus siliculosus) in August, September, and November. The deviance and degrees of freedom express the fitting of the data to the generalized linear model (see Statistical analyses). The summary statistics are presented in Fig. C2.

   

Mid-August

Mid September

Early November

Deviance / df

 

28 / 36

24 / 36

35 / 35

Source

df

χ2

P

χ2

P

χ2

P

Depth

1

2.95

  0.09

0.77

NS

2.97

  0.09

Nutrient

2

7.50

<0.051

3.66

NS

0.15

NS

Herbivory

2

13.86

<0.01

2.10

NS

6.82

<0.05

Depth × nutrient

2

0.88

NS

5.16

0.08

11.27

<0.01

Depth × herbivory

2

2.69

NS

0.83

NS

2.66

NS

Nutrient × herbivory

4

10.96

<0.05

1.93

NS

7.99

0.09

Nutrient × herbivory × depth

4

0.95

NS

5.60

NS

9.76

<0.05



TABLE C3. Statistical analyses of the density of the green alga Enteromorpha sp. in July, August, and November. The deviance and degrees of freedom express the fitting of the data to the generalized linear model (see Statistical analyses). Some non-significant interactions are omitted from the analyses (see Statistical analyses). The summary statistics are presented in Fig. C3.

   

Early July

Mid-August

Early November

Deviance / df

 

51 / 48

38 / 44

49 / 43

Source

df

χ2

P

χ2

P

χ2

P

Depth

1

0.12

NS

6.34

<0.05

0.85

N.S:

Nutrient

2

37.88

<0.0001

27.67

<0.0001

27.15

<0.0001

Herbivory

2

1.19

NS

11.87

<0.001

13.74

<0.01

Depth × nutrient

2

9.25

<0.001

6.43

<0.05

Depth × herbivory

2

6.68

<0.05

4.36

NS

Nutrient × herbivory

4

Depth × nutrient × herbivory

4



TABLE C4. Statistical analyses of the density of the red algae Ceramium tenuicorne in July, September, and November. The deviance and degrees of freedom express the fitting of the data to the generalized linear model (see Statistical analyses). The summary statistics are presented in Fig. C3.

   

Early July

Mid-September

Early November

Deviance / df

 

38 / 36

29 / 36

18 / 35

Source

df

χ2

P

χ2

P

χ2

P

Depth

1

21.24

<0.0001

1.61

NS

0.96

NS

Nutrient

2

15.81

<0.001

7.70

<0.05

11.20

<0.01

Herbivory

2

0.79

NS

0.74

NS

0.47

NS

Depth × nutrient

2

3.06

NS

7.96

<0.05

9.24

<0.01

Depth × herbivory

2

2.32

NS

5.37

  0.07

7.41

<0.05

Nutrient × herbivory

4

2.12

NS

1.53

NS

1.97

NS

Depth × nutrient × herbivory

4

7.54

  0.11

2.74

NS

4.35

NS



FIGC1
 
   FIG. C1. Density of the green alga Cladophora glomerata (mean ± SE) in shallow and deep water, in the three nutrient levels (ambient concentration = white, low enrichment = grey, and high enrichment = black), and in herbivory treatment cages (OC = open, herbivory, RC = roofed herbivory, and CC = closed, no herbivory). The values refer to least square means and SE’s of the model (see Statistical analyses).


FIGC2
 
   FIG. C2. Density of the filamentous brown algae (consisting of Polayella littoralis and Ectocarpus siliculosus) (mean ± SE) in shallow and deep water, in the three nutrient levels (ambient concentration = white, low enrichment = grey, and high enrichment = black), and in herbivory treatment cages (OC = open, herbivory, RC = roofed herbivory, and CC = closed, no herbivory). The values refer to least square means and SE’s of the model (see Statistical analyses).

 

FIGC3
 
   FIG. C3. Density of the green alga Enteromorpha sp. (mean ± SE) in shallow and deep water, in the three nutrient levels (ambient concentration = white, low enrichment = grey, and high enrichment = black), and in herbivory treatment cages (OC = open, herbivory, RC = roofed herbivory, and CC = closed, no herbivory). The values refer to least square means and SE’s of the model (see Statistical analyses).

FIGC4
 
   FIG. C4. Density of Ceramium tenuicorne (mean ± SE) in shallow and deep water, in the three nutrient levels (ambient concentration = white, low enrichment = grey, and high enrichment = black), and in herbivory treatment cages (OC = open, herbivory, RC = roofed herbivory, and CC = closed, no herbivory). The values refer to least square means and SE’s of the model (see Statistical analyses).


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