. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 188 R. F. McMAHON AND W. D. RUSSELL-HUNTER consumption rates from their peak values are not associated with immediate thermal death in L. obtnsata. Instead, aquatic oxygen uptake rates decrease steadily from either 20° C or 30° C with increasing temperatures until death ensues at about ° C (Fig. 3). The oxygen consumption for specimens of L. obtnsata from Manomet Point was greater than that of specimens from the wrarmer Nobska Point environment over a temperature range of 5° to 40° C (Fig. 3). The aerial oxygen upt
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 188 R. F. McMAHON AND W. D. RUSSELL-HUNTER consumption rates from their peak values are not associated with immediate thermal death in L. obtnsata. Instead, aquatic oxygen uptake rates decrease steadily from either 20° C or 30° C with increasing temperatures until death ensues at about ° C (Fig. 3). The oxygen consumption for specimens of L. obtnsata from Manomet Point was greater than that of specimens from the wrarmer Nobska Point environment over a temperature range of 5° to 40° C (Fig. 3). The aerial oxygen uptake in L. obtusata from Nobska Point showed a steady increase from 5° to 35° C (Fig. 3). Rates of oxygen consumption in air were similar to, or lower than, aquatic rates for Nobska Point snails between 5°—25° C and higher than aquatic oxygen uptake rates at 30° and 35° C. At 40° C oxygen uptake rates from air were nearly equal to those from water (Fig. 3). For L. obtnsata, the Qio of oxygen uptake in air was over 5°—35° C, a value much lower than the Qio of aquatic oxygen uptake recorded from either the Nobska or Manomet Point populations. The oxygen uptake of Littorina littorca from both water and air was char- acterized by the maintenance of lower oxygen consumption rates than the other species at all experimental temperatures, and also by an apparent regulation of respiratory rate between 20° and 30° C (Fig. 4). Aquatic oxygen consumption increased from 5° to 20° C in L. littorca from Manomet Point with a Qio of , and from Nobska Point with a Qu, of However, in both groups, aquatic oxygen uptake showed very little change in rate between 20° and 30° C, with Qio values of (Manomet Point) and (Nobska Point). At temperatures higher than 35° C, aquatic oxygen consumption decreased steadily in both Nobska and Manomet snails until death occurred at about 43° C. Aquatic rates were very similar in both the Nobska and Manomet Point L.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
