. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ml/s 10 15 TR,S 20 25 Figure 6. Arenicola #21. Water stroke volume. Vs. versus the duration of successive ventilatory cycles. TR, with the animal breathing through a low resistance, R1, or a high resistance, R2. The oblique lines correspond to various iso-ventilatory flow rates, in milliliters per second. Symbols as in Figure 2. Mean values for Rl (N = 16): Vs = ± ml; TR = ± s; Vw = Vs/TR = ± ml/s. Mean values for R2 (N = 10): Vs = ± ml: TR = ± s; Vw = Vs/TR = ±0.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ml/s 10 15 TR,S 20 25 Figure 6. Arenicola #21. Water stroke volume. Vs. versus the duration of successive ventilatory cycles. TR, with the animal breathing through a low resistance, R1, or a high resistance, R2. The oblique lines correspond to various iso-ventilatory flow rates, in milliliters per second. Symbols as in Figure 2. Mean values for Rl (N = 16): Vs = ± ml; TR = ± s; Vw = Vs/TR = ± ml/s. Mean values for R2 (N = 10): Vs = ± ml: TR = ± s; Vw = Vs/TR = ± ml/s. Only the Vw values are significantly different. icant decrease of the stroke volume and a small, nonsig- nificant increase of the ventilatory period (see legend of Fig. 6 for statistics). 6000 4000 aj 0) •3 2000 - in o o 0 D Resistance R1 + Resistance R2. 0 2000T 4000 6000 8000 "long duration" total oxygen uptake rate, uW Figure 7. Energy cost of breathing, Mg^, as a function of the "long duration" total O2 uptake rate, lgM0°T, of Arenicola breathing through a resistance RI (ca 2600 Pa • s/ml) or R2 (ca 5900 Pa • s/ml). Values for 10 experiments of three periods, each animal breathing successively through resistances RI, R2. RI or R2. RI. R2. The arrow on the abcissa at 2600 ± 400 ,uW (N = 10) corresponds to the measure of the basal metabolism of the lugworm, , the mean O2 uptake rate of an animal doing no ventilatory work, as measured by confinement. MS?NF. The O: uptake rate above Mg°NF is considered as the energy cost of breathing. The slope of the regression line (y = x - 2024: A' =30: r = ) is not significantly different from the theoretical value of I (see equa- tion 2).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laborat
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
