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Supplementary tables.
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Article title: Shifting effects of rock roughness across a benthic food web
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Journal: Hydrobiologia
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Authors: Elizabeth A. Bergey and Joshua T. Cooper
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Corresponding author: Elizabeth Bergey, University of Oklahoma; e-mail: lbergey@ou.edu
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TABLE S1. Statistical summary of algal biomass as total and removed algal biomass in the constructed
streambed rock clusters at the (a) start and (b) end of the colonization experiment. Rock clusters
differed in rock type (shale, quartz-vein, sandstone), disturbance regime (undisturbed control, raked,
scrubbed), and run location (upstream, downstream). Data were pooled across location (α = 0.05; N = 8).
Non-significant interactions (Rock type x disturbance treatment) are not shown.
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a) Initial algal biomass
df
F
P
ANOVA – stream location
1,70
0.000
0.999
MANOVA – total and removed algal biomass
Rock type
4,124 22.43
<0.0001
Disturbance treatment
4,124 3.33
0.013
Rock type
2,63
59.76
<0.0001
Disturbance treatment
2,63
2.78
0.069
Rock type
2,63
7.62
0.0011
Disturbance treatment
2,63
6.78
0.0021
1,70
0.97
0.32
ANOVA: Total algal biomass
ANOVA: Removed algal biomass
b) Final algal biomass
ANOVA – stream location
MANOVA – total and removed algal biomass
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Rock type
4,124 44.84
<0.0001
Disturbance treatment
4,124 2.43
0.051
ANOVA: Total algal biomass
Rock type
2,63
119.19 <0.0001
Disturbance treatment
2,63
1.01
Rock type
2,63
17.071 <0.0001
Disturbance treatment
2,63
4.96
0.37
ANOVA: Removed algal biomass
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0.010
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TABLE S2. Statistical summary of the relationships in the distribution of grazing and predatory
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macroinvertebrates among stream bed rock clusters that differed in rock type (shale, quartz-vein,
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sandstone), disturbance regime (undisturbed control, raked, scrubbed), and run location (upstream,
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downstream). Wilk’s Lambda values are shown MANOVA tests. α = 0.10; N = 4 for combined rock type,
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treatment and location combinations). Non-significant interactions are not shown. Data are graphically
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summarized in Fig. 3
df
F
P
Rock type
4,106
2.09
0.088
Disturbance treatment
4,106
1.59
0.18
Location
2, 53
10.78
0.001
Rock type
2, 54
3.40
0.041
Disturbance treatment
2, 54
2.60
0.084
Location
1, 54
21.92
<0.0001
Rock type
2, 54
1.43
0.25
Disturbance treatment
2, 54
0.34
0.71
MANOVA– Grazers and predators
ANOVA: Grazers
ANOVA: Predators
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Location
1, 54
2.87
0.096
Rock x disturbance x location
4, 54
2.40
0.061
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