Table 2.

Relationship between size parameters measured in situ: volume (by fitting geometric shapes, cm³) and area (cm²); and in the laboratory: dry weight (DW, g), ash-free dry weight (AFDW, g), and volume measured by water displacement (V_dis, ml).

Measured in the lab	Measured in situ	C. reniformis (n = 40)			A. oroides (n = 30)			P. ficiformis (n = 30)			C. crambe (n = 31)			D. avara (n = 30)			Function
		a	b	R2	a	b	R2	a	b	R2	a	b	R2	a	b	R2
DW (g)	Area (cm2)	0.36	0.87	0.87	0.57	0.81	0.81	0.86	0.86	0.89	0.03	0.70	0.84	0.01	1. 35	0.92	Y = axb
	Volume (cm3)	0.41	0.75	0.85	0.22	0.79	0.87	0.74	0.78	0.93	0.09	0.70	0.84	0.01	1. 35	0.92
AFDW (g)	Area (cm2)	0.27	0.89	0.86	0.41	0.79	0.81	0.29	0.84	0.88	0.02	0.70	0.84	0.005	1.35	0.93
	Volume (cm3)	0.31	0.78	0.84	0.15	0.79	0.89	0.22	0.78	0.94	0.062	0.70	0.84	0.004	1.35	0.93
Vdis (ml)	Volume (cm3)	0.00	0.43	0.71	0.00	0.39	0.81	0.00	0.66	0.88	0.00	0.36	0.82	0.00	0.33	0.90	Y = bx (a = 0)

The coefficients of the regression analysis function that best describes this relationship (a and b) as well as the R² are provided for each sponge. The function used (linear or power) is provided in the right column. All regressions were highly significant (the probability that b is zero was <0.001 in all cases).