. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN UPTAKE IN THE SAND DOLLAR 281 5-g (dry weight) starved animal has lower rates when compared with non-starved animals of similar size (Table I; Fig. 2). On a seasonal basis, the slopes for starved and non-starved animals are significantly different (Table II). \Yhen respiratory rates are expressed on a nitrogen basis, Oo uptake of small, starved animals is not as depressed when compared to non-starved animals (Fig. 3) and the regression slopes and intercepts of the two groups are not significantly different (Table II).
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OXYGEN UPTAKE IN THE SAND DOLLAR 281 5-g (dry weight) starved animal has lower rates when compared with non-starved animals of similar size (Table I; Fig. 2). On a seasonal basis, the slopes for starved and non-starved animals are significantly different (Table II). \Yhen respiratory rates are expressed on a nitrogen basis, Oo uptake of small, starved animals is not as depressed when compared to non-starved animals (Fig. 3) and the regression slopes and intercepts of the two groups are not significantly different (Table II). Starved animals of all sizes have significantly less nitrogen/g dry weight than non-starved animals (Lane, 1977; Fig. 4) and small animals lose (metabolize) slightly more nitrogen during starvation than do larger animals (Lane, 1977). Small animals have lower rates of respiration when starved, but they have less body nitrogen as well when compared with larger animals. Rates of respiration depend on the type of system used for measuring respira- tion. Comparison of respiration in closed and open systems at the same tempera- ture shows intercepts, hence rates, of Oo consumption are significantly higher in the open system (Table II). Using pooled slopes and adjusted intercepts for each non-starved starved. 10 T5 DRY WEIGHT 20 25 FIGURE 3. Relationship between oxygen consumption (ml O? respired/hr/g nitrogen) and dry body weight for starved and non-starved specimens of Mellita quinquiespcrforata at fall water temperatures. Rates were calculated as follows; non-starved animals-logio ml Os/hr/g nitrogen equals minus times logio g dry body weight; starved animals-logio ml O2/hr/g nitrogen equals minus times logio g dry body 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
