Table 1.
Summary data for metabolic rate of surface and Pachón A. mexicanus tested under two photoperiods.
Figure 1.
Schematic of the respirometer used in the study (not to scale).
Figure 2.
Comparison of the metabolic rate (O2mean) of A. mexicanus over 7 days at a set swimming speed and two photoperiods.
(A, C, E, G, I) 12:12 light:dark and (B, D, F, H, J) 24 h dark photoperiod. Grey areas represent dark conditions. A to D display the traces for all individuals with the mean superimposed. E and F display mean and 95% confidence intervals. G and H display 24 h running means, and the arrow indicates when acclimation was deemed complete. I and J display the ratio of daytime:nighttime total oxygen consumption.
Figure 3.
Daily variation in the allometrically scaled metabolic rate (O2mean) of A. mexicanus at a set swimming speed and two photoperiods.
(A–C) a 12:12 light:dark and (D–F) 24 h dark photoperiod. Grey areas represent dark conditions. Each trace represents the combined data for 5.5 days. A, B, D and E display the traces for all individuals with the mean superimposed. C and F display mean with 95% confidence intervals. Asterisks indicate time periods where means differ at P<0.05.