. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 130 DARRYL L. FELDER 100- 30- CD 3 40- 20-. -150 -125 100 1 -75 •§ -50 -25 Exposure time, hours FIGURE 4. Temporal variations in aquatic oxygen consumption (open circles) and pleopod ventilatory rate (solid circles) among specimens of Callianassa jamaicense when ambient oxygen tension (crosses on heavy line) is abruptly reduced. Each value is mean rate for five animals. Vertical lines indicate ranges ; rectangles indicate standard errors; horizontal lines indicate time spans over which means are take
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 130 DARRYL L. FELDER 100- 30- CD 3 40- 20-. -150 -125 100 1 -75 •§ -50 -25 Exposure time, hours FIGURE 4. Temporal variations in aquatic oxygen consumption (open circles) and pleopod ventilatory rate (solid circles) among specimens of Callianassa jamaicense when ambient oxygen tension (crosses on heavy line) is abruptly reduced. Each value is mean rate for five animals. Vertical lines indicate ranges ; rectangles indicate standard errors; horizontal lines indicate time spans over which means are taken. Temperature was maintained at 25 ± ° C; salinity was 20 ± 'A. dramatically increased with introduction of hypoxic water. As hypoxic water entered the respiration chamber following 12 hr of anoxia, animals invariably moved to the influent opening of the chamber (Fig. 1) and began rapid ventilation with their pleopocls. The accelerated pleopod activity was maintained near 50 strokes/ min for ca. 30 min after hypoxic water was introduced into the chamber, and animals spent almost all of this time near the influent opening of the respiration chamber. A gradual decrease of pleopod activity paralleled the slowly decreasing V0o which began near the middle of hour 14 and continued through hour 15. When anoxia was terminated by introducing normoxic (150 mmHg) water, the Vo2 increased to two times the rates preceding anoxia (Fig. 6). Five hours after anoxia was terminated, Vo2 approached that observed before anoxia. With the reintroduction of normoxic water, animals moved to the influent opening of the respiration chamber and rapidly ventilated with their pleopocls as when hypoxia (37 mmHg) followed anoxia (Fig. 5). However, animals neither remained at the incurrent opening nor maintained accelerated pleopod activity for as long as when hypoxic water followed anoxia. Field measurements of dissolz'ed oxygen Burrows of C. jamaicense contained very low concentrations of disso
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
