Shell Shape Analysis and Spatial Allometry Patterns of Manila Clam (Ruditapes philippinarum) in a Mesotidal Coastal Lagoon

Table 1

Morphometric variables for arcachon bay.

Descriptor	Formulae	Minimum	Maximum	Mean	Ecart-type
Elongation index	= 𝐻/𝐿	0.66	0.86	0.75	0.02
Compacity index	= 𝑊/𝐿	0.19	0.38	0.28	0.02
Convexity index	= 𝑊/𝐻	0.35	0.51	0.37	0.03
Circle index lateral view	= AL/0.25 × 𝐿^2 × π	0.65	0.85	0.73	0.02
Circle index ventral view	= 2 × AV/0.25 ×  𝐿𝑉𝑒𝑛𝑡^2 × π	0.36	0.70	0.48	0.04
Reference Ellipse index lateral view	= AL/0.25 × 𝐿^2 × π	2.63	3.43	2.94	0.10
Reference Ellipse index ventral view	= 2 × AV/0.25 ×  𝐿𝑉𝑒𝑛𝑡^2 × π	0.73	1.40	0.95	0.08
Weight ratio 1	= 𝑆𝑀/𝐿	0.06	1.76	0.57	0.27
Weight ratio 2	= 𝑆𝑀/𝐻	0.08	2.17	0.76	0.35
Weight ratio 3	= 𝑆𝑀/𝑊	0.23	5.80	2.02	0.88