Covarying Shell Growth Parameters and the Regulation of Shell Shape in Marine Bivalves: A Case Study on Tellinoidea

Table 1

The signs of the variations, 𝜕𝐸/𝜕𝛼, 𝜕𝐸/𝜕𝜌, 𝜕𝐸/𝜕𝛿, 𝜕𝐷/𝜕𝛼, 𝜕𝐷/𝜕𝛿, 𝜕𝐾/𝜕𝛼, 𝜕𝐾/𝜕𝜌, and 𝜕𝐾/𝜕𝛿 of the functionally relevant parameters 𝐸, 𝐾, and 𝐷, according to variations of the growth-based parameters 𝛼, 𝜌, and 𝛿 (according to Section 2).

	𝜕𝐸	𝜕𝐷	𝜕𝐾
/𝜕𝛼	>0	<0	>0
/𝜕𝜌	<0	=0	>0
/𝜕𝛿	>0	>0	<0