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Table 3 Influence of treatment (non-sib/sib) on relative per capita mass increase, mean body weights within groups before and after the experiment, and CV on body weights before and after experiment in groups of 3 (A) and 6 (B) spiders

From: Relatedness facilitates cooperation in the subsocial spider, Stegodyphus tentoriicola

  non-sibs sibs statistics p
A Groups of 3 spiders     
Relative mean mass increase 0.39 ± 0.09 (9) 0.30 ± 0.03 (12) Z = 0.75 0.46
(1 extreme outlier removed) 0.31 ± 0.03 (8) 0.30 ± 0.03 (12) Z = 0.35 0.73
Mean body weights of groups before experiment [mg] (± SE mean) 4.65 ± 0.55 (10) 3.57 ± 0.24 (12) t = -1.9 0.07
Mean body weights of groups after experiment [mg] (± SE mean) 14.42 ± 1.90 (9) 15.05 ± 2.16 (12) t = -0.45 0.66
CV before experiment (± SE mean) 0.08 ± 0.014 (10) 0.07 ± 0.009 (12) Z = 0.23 0.82
CV after experiment (± SE mean) 0.28 ± 0.080 (8) 0.16 ± 0.024 (12) Z = 1.12 0.26
B Groups of 6 spiders     
Relative mean mass increase 0.33 ± 0.02 (10) 0.31 ± 0.03 (9) t = -7.73 0.48
Mean body weights of groups before experiment [mg] (± SE mean) 3.63 ± 0.19 (10) 4.01 ± 0.38 (10) t = 0.93 0.37
Mean body weights of groups after experiment [mg] (± SE mean) 11.10 ± 0.55 (10) 13.37 ± 0.85 (9) t = 2.40 0.028
CV before experiment (± SE mean) 0.099 ± 0.01 (10) 0.067 ± 0.01 (10) t = -2.47 0.024
CV after experiment (± SE mean) 0.33 ± 0.04 (10) 0.19 ± 0.02 (9) t = -2.21 0.041
  1. Means and SE are given and sample sizes in brackets (non-parametrical Wilcoxon test (Z) or parametrical t-tests (t) were performed).