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Table 2 Results from t tests comparing mean RGB values of slugs against RGB values of substrate from their natural habitat, and against substrate from alternative habitats (sample sizes and means ± SD for each colour channel are presented in Table 1)

From: Quantifying phenotype-environment matching in the protected Kerry spotted slug (Mollusca: Gastropoda) using digital photography: exposure to UV radiation determines cryptic colour morphs

   Forested substrate Bog substrate
Channel Mean diff. t p Mean diff. t p
Forested slug R 0.56 0.18 0.852 −57.60 −19.80 <0.001
G 4.30 1.58 0.115 −46.68 −16.64 <0.001
B 2.05 0.78 0.437 −38.22 −12.46 <0.001
Bog slug R 58.51 21.28 <0.001 0.35 0.13 0.894
G 47.69 18.03 <0.001 −3.29 −1.22 0.224
B 36.15 11.91 <0.001 −4.13 −1.21 0.227