Appendix B. MANOVA and univariate ANOVAs testing the effect of nonconsumptive Dytiscus beetle presence and caddisfly sex on three measures of the body size at emergence of Asynarchus caddisflies reared from third instar larvae in mesocosms. Tank means of males and females were treated replicates and values in parentheses are standard errors.
a) Multivariate test |
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Source of variation |
Numerator |
Denominator |
Pillai trace |
F |
P |
df |
df |
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Beetle |
3 |
22 |
0.081 |
0.30 |
0.783 |
Sex |
3 |
22 |
0.934 |
109 |
<0.0001 |
Beetle × sex |
3 |
22 |
0.120 |
0.40 |
0.855 |
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b) Univariate tests |
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Mean (SE) |
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Total mass (mg) |
Thorax mass (mg) |
Wing length (mm) |
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Male |
5.20 (0.13) |
2.62 (0.06) |
12.5 (0.12) |
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Female |
7.89 (0.27) |
3.16 (0.09) |
10.9 (0.14) |
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P |
<0.0001 |
<0.0001 |
<0.0001 |
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