オチバガイの各体部位と殻長との相対成長　─殻長サイズ復元のためのアロメトリー式

抄録

Gari virescens (Psammobiidae) is a near-threatened bivalve species that inhabits tidal flats in Japan. Recently, it has been frequently detected in the gut contents of tidal flat fishes. The purpose of this study is to establish regression formulas for reconstructing the shell length (SL) of predated specimens. Therefore, we clarified the relative growth relationship between body parts of the bivalve and its SL using specimens from the western Seto Inland Sea of Japan. The allometric regression formula for estimating SL (mm) from shell height (SH, mm) was SL = 1.53 × SH^1.0657 (r = 0.998, n = 66, P < 0.01), and the formula for estimating SL (mm) from foot length (FL, mm) was SL = 1.82 × FL^1.0478 (r = 0.969, n = 39, P < 0.01). In addition, we established several other regression formulas for estimating SL. As a case study of applying these formulas, we reconstructed the SL of specimens predated by the fish Acanthopagrus schlegelii. These allometric formulas enable the reconstruction of SL from body parts and shells broken during predation.