Figure 1.
The effect of decreasing temperature at 2°C day−1 on oxygen consumption (MO2) of young-of-the-year (YOY), small and adult (large) cunner.
A repeated measures one-way ANOVA, followed by Dunnett's post-hoc tests (P<0.05), was used to identify significant differences (*) in MO2 between the acclimation temperature (9°C) and the other temperatures within each size class. The arrows indicate the temperature at which a rapid decrease in MO2 was initiated for each size class. Values are mean ±1 S.E. (N = 7 - 8 for each size class).
Table 1.
Morphometric and metabolic parameters for 9°C acclimated cunner of various size classes [YOY, young-of-the-year; small and large (adult)] when exposed to a temperature decrease from 9°C to 1°C at 2°C day−1.
Figure 2.
The relationship between body mass and oxygen consumption (MO2) for young-of-the-year (YOY), small and large (adult) cunner during an 8°C temperature decrease over 4 days.
The mass scaling exponent (b) at each temperature was calculated as the slope of the log – log relationship plus 1.
Figure 3.
The effect of increasing temperature at 2°C h−1 until loss of equilibrium (CTMax) on oxygen consumption in (A) cunner and (B) Atlantic cod.
Each line represents one size class: YOY (0.2–0.5 g), small (3–6 g), or large (∼100 g). Values are means ±1 S.E.
Figure 4.
The relationship between body mass and CTMax in cunner and Atlantic cod.
An asterisk (*) indicates data plotted from previous studies ([22]; Gamperl and Canada, unpublished), whereas dissimilar letters indicate a significant difference (P<0.05) in CTMax values between the three size classes of cunner. Note: the CTMax values for YOY Atlantic cod (∼0.3 g) tested in the respirometer and the tank were significantly different (P<0.05). Values are mean ± 1 S.E.
Table 2.
Metabolic parameters and Critical Thermal Maximum (CTMax) values for 10°C acclimated cunner and Atlantic cod of various size classes [YOY, young of the year; small and large (adult)] when exposed to an acute temperature increase of 2°C h−1.
Figure 5.
The effect of body size on metabolic parameters in cunner and Atlantic cod [Routine Metabolic Rate (RMR, A), Maximum Metabolic Rate (MMR, B), Absolute Metabolic Scope (AMS, C), and Factorial Metabolic Scope (FMS, D)].
Dashed and solid lines indicate linear regressions for the cunner and Atlantic cod, respectively. The mass scaling exponent (b) at each temperature was calculated as the slope of the log – log relationships plus 1. An asterisk (*) indicates an estimated value based on data from 9 Atlantic cod acclimated to, and tested at, both 8°C and 12°C (Gamperl and Canada, unpublished). All regressions were significant at p<0.001.