. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 252 MCMAHON AND RUSSELL-HUNTER 42 41 40 c ~ 39 38 z < UJ 37 36. •r i i i i i i i i i i i i 0 I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 DAYS of ACCLIMATION FIGURE 1. Heat coma temperature (HCT) in Melampus bidentatus ,and its acclimation with time. The vertical axis shows mean HCT in degrees centigrade. The horizontal axis represents the duration of the temperature acclimation period in days. All snails were freshly collected from the Little Sippiwisset Marsh at day zero (ambient air temperature = 17°C). The open circles conn
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 252 MCMAHON AND RUSSELL-HUNTER 42 41 40 c ~ 39 38 z < UJ 37 36. •r i i i i i i i i i i i i 0 I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 DAYS of ACCLIMATION FIGURE 1. Heat coma temperature (HCT) in Melampus bidentatus ,and its acclimation with time. The vertical axis shows mean HCT in degrees centigrade. The horizontal axis represents the duration of the temperature acclimation period in days. All snails were freshly collected from the Little Sippiwisset Marsh at day zero (ambient air temperature = 17°C). The open circles connected by dashed lines are mean HCT values of snails held at 10°C, and the open triangles connected by solid lines, mean HCT values of similar snails held at 20°C. Each point is the mean value for 20-30 individuals, and the vertical bars represent 95% confidence limits about mean HCT values. in HCT (P > ) occurred (Fig. 1). Therefore, acclimation periods greater than 20 days were used for all subsequent tests of temperature tolerance and of oxygen consumption. Mean HCT values of 20°C-acclimated snails were significantly higher (T > , P < ) than those acclimated to 10°C, averaging °C higher over all salinities tested (SD = ±, range = , N = 5). This yields a rate of HCT acclimation per degree increase in acclimation temperature of °C (Table II). A one-way analysis of variance revealed that salinity also had a highly signif- icant effect on HCT in Melampus at both acclimation temperatures (10°C accli- TABLE II Mean heat coma temperature (HCT), standard deviation (SD), standard error (SE), 95 % confidence limit (95%) and sample size (N) in relation to salinity and temperature in Melampus bidentatus. 10°C Acclimated 20°C Acclimated Salinity HCT (°C) SD SE 95% N HCT (°C) SD SE 95% N 100% SW ± ± ± 18 ± ± ± 20 75% SW ± ± ± 19 ± ± ± 20 50% SW
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
