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Table 2 Dictyota dichotoma. Effects of stages and seasons on vegetative characteristics

From: Temporal variations of vegetative features, sex ratios and reproductive phenology in a Dictyota dichotoma (Dictyotales, Phaeophyceae) population of Argentina

Parameter

Factor

df

MS

F

p

SNK

Length frond (cm)

Stage

3

0.950

8.273

<0.0001

a)sp; b)m, f; ab)nf

Season

3

8.933

77.808

<0.0001

a)w; b)au; c)s; d)su

Season × stage

8

0.087

0.757

0.641

 

Dry mass frond (g)

Stage

3

7.419

7.991

<0.0001

a)sp; b)f; ab)m, nf

Season

3

37.903

40.826

<0.001

a)w, s; b)su, au

Season × stage

8

0.565

0.609

0.770

 

Interdichotomie width (μm)

Stage

3

0.259

2.158

0.094

 

Season

3

3.217

26.785

<0.0001

a)s; ab)w, au; b)su

Season × stage

8

0.050

0.419

0.909

 

Interdichotomie length (μm)

Stage

3

0.110

0.749

0.524

 

Season

3

0.684

4.638

0.04

a)au, s; b)su, w

Season × stage

8

0.237

1.609

0.123

 

Number of branches

Stage

3

0.187

2.955

0.033

a)sp, f, nf; b) m

Season

3

0.352

5.560

0.001

a)w; ab)au, s; b)su

Season × stage

8

0.063

1.000

0.437

 

Apical angle (°)

Stage

3

0.115

0.637

0.592

 

Season

3

0.893

4.943

0.002

a)w, s; ab)au; b)su

Season × stage

8

0.127

0.702

0.689

 

Basal angle (°)

Stage

3

10.248

4.492

0.004

a)sp, nf; b)m, f

Season

3

24.326

10.662

<0.0001

a)w; ab)s; b)au; c)su

Season × stage

8

2.737

1.199

0.300

 

Cortical cell length (μm)

Stage

3

118.218

0.957

0.414

 

Season

3

709.56

5.747

0.001

a)w; ab)au; b)su; c)s

Season × stage

8

73.64

0.596

0.780

 

Cortical cell width (μm)

Stage

3

0.639

1.341

0.262

 

Season

3

0.237

0.497

0.685

 

Season × stage

8

0.394

0.826

0.580

 

Cortical cell height (μm)

Stage

3

0.197

1.510

0.213

 

Season

3

0.290

2.218

0.087

 

Season × stage

8

0.130

0.999

0.438

 

Medullar cell length (μm)

Stage

3

0.581

0.371

0.774

 

Season

3

24.456

15.604

<0.0001

a)w; ab)au; bc)su; c)s

Season × stage

8

1.821

1.162

0.324

 

Medullar cell width (μm)

Stage

3

0.036

0.073

0.974

 

Season

3

1.573

3.170

0.025

a)w; ab)au; bc)su; c)s

Season × stage

8

0.233

0.470

0.876

 

Medullar cell height (μm)

Stage

3

0.378

2.612

0.052

 

Season

3

0.692

4.785

0.003

a)w; ab)au, su; c)s

Season × stage

8

0.136

0.937

0.487

 
  1. Two-way model I ANOVA. Monthly sampling during April 2009–March 2010; df degrees of freedom, MS mean square, F ANOVAF-statistic, p probability; significant effects in bold type. Significant differences between stages and seasons (α < 0.05) are indicated by different letters (SNK-test)
  2. Seasons’ abbreviations: au autumn, w winter, s spring, su summer. Stages’ abbreviations: sp sporophytes, m male gametophyte, f female gametophyte, nf non-fertile
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Helgoland Marine Research

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