. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESPIRATION IN SCALLOPS ML 02 IN SYRINGE 0 I 2 TIME (HRS) 197 r 5 r 4. I2 FIGURE 5. Rate of oxygen uptake in the sea scallop in approximately air-saturated water. Ordinate: amount of oxygen (ml.) in the measuring syringe. Abscissa: time (hrs.). Number- ing of tests as in Table I. Small circles: blank runs. factors and the metabolic rate in marine Lamellibranchia has been dealt with al- ready by Sparck (1936). The following data (adult specimens, outside the spawn- ing season) were used: Sparck (1936) : 9 arctic, 12 boreal, a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RESPIRATION IN SCALLOPS ML 02 IN SYRINGE 0 I 2 TIME (HRS) 197 r 5 r 4. I2 FIGURE 5. Rate of oxygen uptake in the sea scallop in approximately air-saturated water. Ordinate: amount of oxygen (ml.) in the measuring syringe. Abscissa: time (hrs.). Number- ing of tests as in Table I. Small circles: blank runs. factors and the metabolic rate in marine Lamellibranchia has been dealt with al- ready by Sparck (1936). The following data (adult specimens, outside the spawn- ing season) were used: Sparck (1936) : 9 arctic, 12 boreal, and 11 mediterranean species; Thorson (1936) : 11 arctic species; Thamdrup (1935) : 3 boreal species; Bruce (1926) : one boreal species; and Whedon and Sommer (1937) : one boreal species. The figure indicates that the CX-consumption in the bay scallop is essen- tially the same as that in the sea scallop. Over the range of temperatures investi- gated (16-24° C), the O2-uptake in these species is somewhat intermediate in posi- tion between the O2-uptake of mediterranean scallops and that of more sedentary bivalves from that area and thus is about the same as the O2-uptake of the average boreal non-swimming lamellibranch. In using the curves in Figure 4 as a basis for comparison, it must be borne in mind, however, that they give a greatly simpli- fied picture inasmuch as the data, from which they were computed, show a very considerable spread in most cases. The spread in the Qo2-values of the different species of lamellibranchs in the boreal-sedentary group, is indicated in the figure (stippled lines). Not enough data are available to establish, in the bay and sea scallop, a relation between Qo2 and season or size, or to estimate Q10. For several species of bivalve molluscs, lengthy periods of stoppage of the water propulsion have been reported in the literature. To the list of species given by van Dam (1938, p. 123; cf. also Verwey 1952, pp. 189-193) can be added Venus mercenaria
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
