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Table 3 Results of biometric relations obtained for Grapsus grapsus and allometric level of each equation

From: Biology of Grapsus grapsus (Linnaeus, 1758) (Brachyura, Grapsidae) in the Saint Peter and Saint Paul Archipelago, Equatorial Atlantic Ocean

Biometric relation Sex Category n Equation (y = ax b) R 2 Allometric level Somerton’s F test*
F value Cut-off (mm)
PL × CW M Immature 74 PL = 0.544CW0.91 0.94 36.11 28.0
Prepubertal 228 PL = 0.214CW1.19 0.96 + 63.84 51.4
Pubertal 68 PL = 0.0179CW1.82 0.90 +++   
GL × CW M Immature 78 GL = 0.0125CW1.94 0.95 ++++ 532.17 28.8
Prepubertal 296 GL = 0.398CW0.91 0.96   
AW × CW F Immature 52 AW = 0.119CW1.37 0.98 ++ 27.42 23.8
Prepubertal 87 AW = 0.0314CW1.80 0.94 +++ 769.91 33.8
Pubertal 176 AW = 0.777CW0.96 0.97 0   **
  1. PL chelae propodus length, CW carapace width, GL first gonopod length, AW width of the fifth female abdominal somite
  2. – negative, + positive, 0 isometry
  3. * Inflection point estimated in Mature 1 analyses (P < 0.01), except ** where Mature 2 was used