Ecological Archives E091-096-A4

Andrew Olaf Shelton. 2010. The origin of female-biased sex ratios in intertidal seagrasses (Phyllospadix spp.). Ecology 91:1380–1390.

Appendix D. Statisitcal tables for cost of reproduction analyses.

TABLE D1. Sample sizes used in fitting the plant size–spadix number regression.

 

P. scouleri

P. serrulatus

Year

Males

Females

Males

Females

2006

49

30

71

132

2007

34

55

11

175

2008

28

80

14

156

 

TABLE D2. T test on the dry weight mass (g) of of Phyllospadix scouleri flowering male and female spadices collected in spring 2008 (n = 12 for each sex).

 

Mean

SE

T

df

P

Males

0.082

0.007

1.62

20.02

0.120

Females

0.065

0.007

 

 

 

 

TABLE D3. T test on the dry weight mass (g) of Phyllospadix serrulatus flowering male and female spadices collected in 2007 (n = 24 and n = 0.17 for females and males, respectively).

 

Mean

SE

T

df

P

Males

0.034

0.002

2.38

38.57

0.022

Females

0.040

0.002

 

 

 

 

TABLE D4. Sex differences in the number of reproductive structures (spadices) in Phyllospadix scouleri. Coefficients for the AIC selected model describing the spadices in a patch.

Fixed effects

 

 

 

 

 

 

Value

SE

df

T

P

Intercept

-2.02

0.28

195

-7.25

<0.0001

Log(patch size)

0.66

0.05

78

14.26

<0.0001

Sex(M)

1.20

0.11

195

10.64

<0.0001

 

 

 

 

 

 

Random effects

 

 

 

 

 

 

Mean

SD

 

 

 

Individual

Intercept

0.49

 

 

 

 

TABLE D5. Sex differences in the number of reproductive structures (spadices) in Phyllospadix scouleri. ANOVA table for the AIC selected model.

Fixed effects

 

 

 

 

 

Num df

Den df

F

P

Sex(M)

1

78

129.18

<0.0001

Log(patch size)

1

195

113.22

<0.0001

 

TABLE D6. Sex differences in the number of reproductive structures (spadices) in Phyllospadix serrulatus. Coefficients for the AIC selected model describing the spadices in a patch.

Fixed effects

 

 

 

 

 

 

Value

SE

df

T

P

Intercept

-1.04

0.18

294

-5.67

<0.0001

Log(patch size)

0.59

0.03

261

17.69

<0.0001

Sex(M)

0.26

0.40

294

0.65

0.515

Log(patch size) × Sex(M)

0.12

0.07

261

1.62

0.1065

 

 

 

 

 

 

Random effects

 

 

 

 

 

 

Mean

SD

 

 

 

Individual

Intercept

0.38

 

 

 

 

TABLE D7. Sex differences in the number of reproductive structures (spadices) in Phyllospadix serrulatus. ANOVA table for the AIC selected model.

Fixed effects

 

 

 

 

 

Num df

Den df

F

P

Log(patch size)

1

261

429.97

<0.0001

Sex(M)

1

294

109.08

<0.0001

Log(Patch size) × sex(M)

1

261

2.62

0.107

 

TABLE D8. Statistical tables describing the relationship between reproductive residuals at time t and time t + 1 for Phyllospadix scouleri. The AIC preferred model is presented below. Initially, sex, residual (t = 1) and their interaction were fit as fixed effects but both the sex and sex × residual (t = 1) were dropped during model selection. Adj R2 = 0.137.

Regression coefficients

 

 

 

 

 

Value

SE

T

P

Intercept

-0.031

0.08

-0.38

0.70

Residual (t = 1)

0.357

0.10

17.69

0.0008


ANOVA

 

 

 

 

 

 

df

SSE

MSE

F

P

Residual (t = 1)

1

5.72

5.72

12.40

0.0008

Error

71

32.77

0.462

 

 

 

TABLE D9. Statistical tables describing reproductive residuals for Phyllospadix serrulatus. See Table D8 caption for details. Adj R2 = 0.087.

Regression coefficients

 

 

 

 

 

Value

SE

T

P

Intercept

0.033

0.05

0.70

0.48

Residual (t = 1)

0.357

0.07

5.04

<0.0001


ANOVA

 

 

 

 

 

 

df

SSE

MSE

F

P

Residual (t = 1)

1

13.28

13.28

25.44

<0.0001

Error

254

132.56

0.52

 

 


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