Ecological Archives M080-005-A4

Jon D. Witman, Margarita Brandt, and Franz Smith. 2010. Coupling between subtidal prey and consumers along a mesoscale upwelling gradient in the Galápagos Islands. Ecological Monographs 80:153–177.

Appendix D. ANOVA table analyzing arcsine square-root-transformed percent cover of barnacles in rock wall habitats in 2003.

TABLE D1. ANOVA table analyzing arcsine square-root-transformed percent cover of barnacles in rock wall habitats in 2003. Main factors were depth (6, 15 m), upwelling classification (WUP, IUP, SUP) and site (12) nested within upwelling. There were 304 degrees of freedom (df) total. SS = sum of squares. The ANOVA model explained 71.2% of the variation in the data. Planned contrasts comparing the mean cover of barnacles among the different upwelling groups indicated that cover was significantly higher in the strong upwelling group (SUP) than either the intermediate (IUP) or weak (WUP) upwelling groups (SUP vs. IUP, F ratio = 163.42, P < 0.0001; SUP vs. WUP, F ratio = 372.72, P < 0.0001) and that cover in the IUP group was higher than in the WUP group (IUP vs. WUP, F ratio = 35.371, P < 0.0001). All contrasts with 1 and 281 df.

 

SS

df

F ratio

P

Depth (D)

1.542

1

138.353

< 0.0001

Upwelling (U)

4.394

2

197.079

< 0.0001

Site[U]

1.099

9

10.957

< 0.0001

D × U

0.035

2

1.587

0.206

D × Site[U]

0.794

9

7.914

< 0.0001

Residual

3.132

281

   

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