. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Level of basal maintenance .5 I 5 10 50 100 Live Wt fg) 500 FIGURE 4. Caloric value of stomach contents found in collected crabs, contrasted with the caloric cost of basal maintenance. Crabs to the left of the vertical dashed line are immature- prepubescent, those to the right are mature. Data presented as size class averages (dots) and means (small symbols) for immature-prepubescent, mature females (mean only), and mature males. The effect of the cycling rate is shown by doubling the caloric values (large symbols and dashed
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Level of basal maintenance .5 I 5 10 50 100 Live Wt fg) 500 FIGURE 4. Caloric value of stomach contents found in collected crabs, contrasted with the caloric cost of basal maintenance. Crabs to the left of the vertical dashed line are immature- prepubescent, those to the right are mature. Data presented as size class averages (dots) and means (small symbols) for immature-prepubescent, mature females (mean only), and mature males. The effect of the cycling rate is shown by doubling the caloric values (large symbols and dashed regression lines). especially in mature males. Again, immature crabs maintain a balance close to the maintenance cost, the regression of caloric values following the same slope as metabolism. Mature females also have a balance close to the maintenance cost. (The cost of monthly reproduction is less than that of rapid immature growth, Aldrich, 1972.) These trends suggested by the stomach contents are not as clear as the preceding ones due to the extreme variability in both the amount and caloric value of the contents (Table III), and the presentation is made without statistical significance (according to correlation coefficients). However, the trends agree with those previously found, the low caloric values for the mature males are especially marked, suggesting a real underutilization of stomach capacity. The stomach content findings are complicated by the cycling rate, or multiples of stomach capacity (stomachsfull) that can be processed in a 24 hour period. In four sets of feeding experiments the maximum consumption in 24 hours averaged stomachsfull (Table, IV). This means that the estimated maxi- mum stomach capacity could be processed twice a day, or the cycling rate is such that any given contents could be digested within 12 hours. These figures were obtained with cleaned fish, mussels, and algae, all readily digestible. An earlier experiment (No. 5 in Table IV) where
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
