. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 370 W. RUSSELL HUNTER AND DAVID C. GRANT ligament (Trueman, 1954) and the hydraulics of the mantle cavity (Chapman and Newell, 1956) have been investigated in Mya. In spite of other differences, Spisula has a ligament structurally similar to that of Mya. The data presented in the present paper result from an investigation of the mechanical characteristics of the ligament in Spisula solidissima at Woods Hole, and include hysteresis curves and determinations of the opening moment in a range of growth stages (sizes). These data
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 370 W. RUSSELL HUNTER AND DAVID C. GRANT ligament (Trueman, 1954) and the hydraulics of the mantle cavity (Chapman and Newell, 1956) have been investigated in Mya. In spite of other differences, Spisula has a ligament structurally similar to that of Mya. The data presented in the present paper result from an investigation of the mechanical characteristics of the ligament in Spisula solidissima at Woods Hole, and include hysteresis curves and determinations of the opening moment in a range of growth stages (sizes). These data are then discussed in relation to the earlier work of Trueman and others, with special reference to the marked differences between Spisula and Mya. MATERIAL AND METHODS Specimens of the surf-clam, Spisula solidissima, were obtained from a locality on the shores of Martha's Vineyard known to Mr. Milton B. Gray and one of the present authors (). All the material used was collected by hand from BEAM 2x ADJUSTABLE ROD ADJUSTABLE LIMITING RING n PIVOT WEIGHT PAN] ADJUSTABLE SUPPORTING RING. CLAM WEIGHT PAN 2 FIGURE 1. The apparatus used to measure the mechanical characteristics of the ligament in Spisula (slightly modified from Trueman, 1951, 1953). The pivoted beam is counterbalanced by weights in pan 1, and is so arranged that the force applied through the adjustable rod to the centroid of the upper valve is twice the load (L) in pan 2. The actual moment applied to the ligament also depends on the distance (d) between the pivotal axis of the ligament and the point of application (, the valve centroid). The diagram is not to scale. For further details, see text. depths of 10-13 feet (3-4 m.) by , using a face mask and snorkel, and a range of sizes was deliberately selected to include specimens of the largest clams in the population. In this locality, clams occur up to 18 cm. maximum shell length, with a wet weight of 860 g. (with shell, but drained of mantle cavity
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
