. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 15 Time (days) 20 25 Figure 5. Effect of oxygen tension on growth rate of 7 longi- caudatus. Each point represents the mean mass of all individuals in a single pool (see Materials and Methods for details). Squares represent mean wet mass for animals raised at constant hyperoxia (200 torr). Crosses represent mean wet mass for animals raised at constant hypoxia (70 torr). Slopes of lines are significantly different (ANCOVA p ,„ ranging from to from 18°-28°C). In addition, Shtcherbakov and Muragina (1953) repor
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 15 Time (days) 20 25 Figure 5. Effect of oxygen tension on growth rate of 7 longi- caudatus. Each point represents the mean mass of all individuals in a single pool (see Materials and Methods for details). Squares represent mean wet mass for animals raised at constant hyperoxia (200 torr). Crosses represent mean wet mass for animals raised at constant hypoxia (70 torr). Slopes of lines are significantly different (ANCOVA p ,„ ranging from to from 18°-28°C). In addition, Shtcherbakov and Muragina (1953) reported a Qio of at 15°C for Triops cancriformis, and Hillyard and Vinegar (1972) reported a lower Qw of between 26° and 30°C for T. longicaudatus, although it is unclear what oxygen tensions were used to measure metabolic rate. The relatively high temperature sensitivity of the Notostraca suggests that diurnal fluctuations in temper- ature, even in vernal pools where oscillations may be less extreme (Wiggins el 1980), may be essential to elevate metabolism and thus increase rates of growth and repro- duction. Many crustaceans from environments that regularly experience large fluctuations of oxygen and temperature 160 " 120 A = Hyperoxic (200 torr) D = Low Temperature (125 torr) • = High Temperature (125 torr) £. 100 o o CD 80 100 200 300 400 500 600 700 800 900 1000 Mass (mg) Figure 6. Relationship between mass and fecundity for Triops ton- giciniilalii* Triangles represent animals raised at constant hyperoxic conditions (200 torr) and a mean temperature of °C, cycled between 19° and 3I°C. Open squares represent animals raised at a mean tem- perature of °C (cycled between 19° and 29°C), and closed squares represent animals raised at mean temperature of °C (cycled between 19° and 31°C) and normoxia. Regression lines are for all data at 125 torr and animals raised at hyperoxia. Slope of hyperoxic line is signifi- cantly different tha
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