. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECTS OF EYESTALK REMOVAL IN UCA PUGILATOR 181 RESULTS Operative Mortality The operative mortality was quite low in spite of the fact that the eyestalks were merely cut off with a pair of scissors without further measures. The usual operative mortality is 8 per cent, although it may rise to 12 per cent. All deaths occurring during the first 4 days follow- ing the operation were listed as operative deaths. In the large series of 753 animals, per cent died within the first three days. After the first few days, the animal
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECTS OF EYESTALK REMOVAL IN UCA PUGILATOR 181 RESULTS Operative Mortality The operative mortality was quite low in spite of the fact that the eyestalks were merely cut off with a pair of scissors without further measures. The usual operative mortality is 8 per cent, although it may rise to 12 per cent. All deaths occurring during the first 4 days follow- ing the operation were listed as operative deaths. In the large series of 753 animals, per cent died within the first three days. After the first few days, the animals recover from the shock of the operation, and appear to be in good condition. They are vigorous, eat well, and show, at least superficially, no signs of serious weakness. Such a condition is maintained until the first moult, after which serious debilities appear. Some of these post-operative animals die at various times before their first moult, but these cases will be analyzed in another section. No ob- servations were made with regard to a diurnal cycle of motor activity. Moulting In the first series of 76 animals, the first case of moulting occurred on the eleventh day following excision of the eystalks. By the sixteenth day, 50 per cent of the animals had moulted, and by the thirty-fifth day, all of the operated animals had moulted. The control group of animals showed quite different results. Only 7 of these animals had moulted during the 48 days of observation, the first case occurring on the twenty- fifth day after the experiment was started. The results are expressed in the form of curves (Fig. 1), showing the percentage of animals moulted at daily intervals following the operation. Such curves bring out more readily the accelerating effect of eyestalk removal on moulting. The larger series of 753 animals showed a moulting rate essentially similar to that already described. The shape of the curve was approxi- mately the same as that in Fig. 1, but was shifted farther al
Size: 1623px × 1540px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
