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

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

Biometric relation	Sex	Category	n	Equation (y = ax ^b)	R ²	Allometric level	Somerton’s F test*
Biometric relation	Sex	Category	n	Equation (y = ax ^b)	R ²	Allometric level	F value	Cut-off (mm)
PL × CW	M	Immature	74	PL = 0.544CW^0.91	0.94	−	36.11	28.0
		Prepubertal	228	PL = 0.214CW^1.19	0.96	+	63.84	51.4
		Pubertal	68	PL = 0.0179CW^1.82	0.90	+++
GL × CW	M	Immature	78	GL = 0.0125CW^1.94	0.95	++++	532.17	28.8
GL × CW	M	Prepubertal	296	GL = 0.398CW^0.91	0.96	−
AW × CW	F	Immature	52	AW = 0.119CW^1.37	0.98	++	27.42	23.8
		Prepubertal	87	AW = 0.0314CW^1.80	0.94	+++	769.91	33.8
		Pubertal	176	AW = 0.777CW^0.96	0.97	0		**

PL chelae propodus length, CW carapace width, GL first gonopod length, AW width of the fifth female abdominal somite
– negative, + positive, 0 isometry
* Inflection point estimated in Mature 1 analyses (P < 0.01), except ** where Mature 2 was used

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