International Journal of Zoology

Research Article

Allometric Growth of the Freshwater Crab Potamon algeriense (Bott, 1967) (Decapoda, Brachyura, Potamidae) in Oued Zegzel, a Mountain Stream, in the Northeast of Morocco

Table 2

Regression analyses of morphometric data of Potamon algeriense. Carapace width (CW) was used as the independent variable.


Variable	Sex/Stage	N	Power Equation Y=a.	log Y= log a + b log X	R²	t (b=1)	Allometry level^∗

WW	JM	187	WW=9.772CW^2.87	log WW=2.87 log CW+0.990	0.961	2.91	=
	AM	191	WW=3.890CW^3.17	log WW=3.17 log CW+0.590	0.988	3.67∗	+
	JF	181	WW=5.129CW^2.95	log WW=2.95 log CW+0.710	0.984	3.05	=
	AF	110	WW=8.710CW^2.81	log WW=2.81 log CW+0.940	0.957	2.89	=

CL	JM	187	CL=1.071CW^1.02	log CL=1.02 log CW+0.029	0.993	1.09	=
	AM	191	CL=1.015CW^1.04	log CL=1.04 log CW+0.006	0.991	1.14	=
	JF	181	CL=0.955CW^0.97	log CL=0.97 log CW-0.020	0.993	0.94	=
	AF	110	CL=1.230CW^0.90	log CL=0.90 log CW+0.090	0.982	0.89	=

AW	JM	187	AW=0.602CW^0.99	log AW=0.99 log CW-0.220	0.972	1.01	=
	AM	191	AW=0.741CW^0.93	log AW=0.93 log CW-0.130	0.969	0.72∗	-
	JF	181	AW=0.275CW^1.12	log AW=1.12 log CW-0.560	0.910	1.12	=
	AF	110	AW=0.100CW^1.47	log AW=1.47 log CW-1.000	0.813	4.65∗	+

AL	JM	187	AL=0.436CW^1.00	log AL=1.00 log CW-0.361	0.958	1.00	=
	AM	191	AL=0.602CW^0.89	log AL=0.89 log CW-0.220	0.927	0.95	=
	JF	181	AL=0.309CW^1.19	log AL=1.19 log CW-0.510	0.939	1.15	=
	AF	110	AL=0.380CW^1.15	log AL=1.15 log CW-0.420	0.887	1.10	=

ChW	JM	187	ChW=0.741CW^1.03	log ChW=1.03 log CW-0.130	0.926	1.02	=
	AM	191	ChW=0.245CW^1.38	log ChW=1.8 log CW-0.611	0.913	9.89∗	+
	JF	181	ChW=0.182CW^1.17	log ChW=1.17 log CW-0.740	0.908	1.17	=
	AF	110	ChW=0.097CW^1.36	log ChW=1.36 log CW-1.013	0.797	7.34∗	+

ChL	JM	187	ChL=0.213CW^1.17	log ChL=1.17 log CW-0.672	0.952	1.16	=
	AM	191	ChL=0.067CW^1.52	log ChL=1.52 log CW-1.174	0.945	8.56∗	+
	JF	181	ChL=0.501CW^1.11	log ChL=1.11 log CW-0.300	0.962	1.10	=
	AF	110	ChL=0.380CW^1.20	log ChL=1.20 log CW-0.420	0.876	8.20∗	+

∗ t-test; α= 0.05.
WW: wet weight; CL: carapace length; AW: abdomen width; AL: abdomen length; ChW: cheliped width; ChL: cheliped length; JM: juvenile males; AM: adult males; JF= juvenile females; AF: adult females; N: number of specimens.
(=) isometry; (+) positive allometry; (-) negative allometry.