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Table 1 The effects of genotype, food level, and their interaction on phenotypic traits in Daphnia pulex

From: Evolution of asexual Daphnia pulex in Japan: variations and covariations of the digestive, morphological and life history traits

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
  1. The means and ranges of these traits examined for Daphnia JPN1 are shown with the variance components of each effect (Var %). Statistically significant p-values (< 0.05) are shown in bold