Table 1 The effects of genotype, food level, and their interaction on phenotypic traits in Daphnia pulex
Trait | Mean | Range | Genotype | Food | Genotype × Food | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
F-value | p | Var % | F-value | p | Var % | F-value | p | Var % | |||
Digestive | |||||||||||
 Beta-glucosidase (nmol hr.−1 mgprotein−1) | 322.8 | 93.9–680.6 | 10.56 | <  0.001 | 4.42 | 260.46 | <  0.001 | 83.19 | 4.32 | 0.03 | 1.77 |
 Lipase (nmol hr.−1 mgprotein− 1) | 1949.4 | 1212.0–2789.4 | 1.61 | 0.95 | 0.00 | 0.02 | 1.00 | 0.00 | 0.99 | 1.00 | 0.00 |
 Alkaline phosphatase (nmol hr.−1 mgprotein− 1) | 764.47 | 325.5–1526.2 | 13.83 | <  0.001 | 2.08 | 37.56 | <  0.001 | 35.41 | 6.15 | 0.01 | 20.83 |
 Arginine amino-peptidase (nmol hr.−1 mgprotein− 1) | 195.93 | 67.0–578.5 | 6.46 | 0.01 | 8.80 | 125.17 | <  0.001 | 80.00 | 0.38 | 1.00 | 0.00 |
 Alanine amino-peptidase (nmol hr.−1 mgprotein− 1) | 178.05 | 82.9–310.1 | 11.75 | <  0.001 | 16.12 | 106.94 | <  0.001 | 59.16 | 0.68 | 1.00 | 0.40 |
Life history | |||||||||||
 Maturation age (days) | 7.62 | 5.00–12.00 | 9.48 | <  0.001 | 12.55 | 96.81 | <  0.001 | 65.21 | 0.20 | 1.00 | 0.00 |
 Maturation instar number | 3.14 | 1.00–6.00 | 4.66 | 0.02 | 10.40 | 36.65 | <  0.001 | 45.60 | 0.96 | 1.00 | 0.09 |
 Maturation body length (mm) | 1.61 | 1.32–1.90 | 6.45 | <  0.001 | 23.57 | 7.52 | 0.09 | 14.35 | 0.74 | 1.00 | 0.00 |
 Intermoult duration before maturation (days) | 1.94 | 1.50–4.50 | 1.62 | 1.00 | 4.21 | 9.56 | 0.03 | 20.20 | 0.05 | 1.00 | 0.00 |
 Intermoult duration after maturation (days) | 2.31 | 2.00–2.67 | 1.65 | 1.00 | 0.00 | 3.10 | 0.88 | 4.98 | 2.61 | 0.44 | 11.20 |
 k | 0.11 | 0.06–0.17 | 5.57 | 0.009 | 19.40 | 3.60 | 0.81 | 0.05 | 1.61 | 1.00 | 0.05 |
 Mean egg number of the first three clutches | 6.19 | 1.67–12.50 | 7.78 | <  0.001 | 4.51 | 177.12 | <  0.001 | 76.21 | 2.78 | 0.33 | 3.99 |
Morphology | |||||||||||
 Mean neonate size of the first three clutches (mm) | 0.63 | 0.50–0.78 | 10.28 | <  0.001 | 1.47 | 19.59 | <  0.001 | 13.64 | 8.43 | <  0.001 | 29.32 |
 Body length at five days (mm) | 1.29 | 0.98–1.54 | 21.26 | <  0.001 | 64.66 | 2.16 | 0.30 | 1.37 | 1.18 | 0.67 | 1.64 |
 Body weight at five days (mg) | 0.02 | 0.006–0.03 | 15.52 | <  0.001 | 47.37 | 11.84 | 0.001 | 15.79 | 1.72 | 0.34 | 5.26 |
 Relative tail spine length of the first adult instar | 0.19 | 0.10–0.25 | 41.78 | <  0.001 | 75.67 | 18.87 | <  0.001 | 0.00 | 2.49 | 0.66 | 5.88 |
 L∞ (mm) | 2.45 | 1.89–3.10 | 12.09 | <  0.001 | 8.33 | 158.07 | <  0.001 | 70.43 | 3.35 | 0.22 | 5.24 |