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Fig. 1. Seasonal variation in the number of ß-adrenergic receptors
(ß-ARs; grey bars) and daily ambient water temperature (black line)
throughout the study. Values are means ± S.E.M.
(N=8). The inset shows the linear regression curve for ß-AR
number vs mean water temperature (P=0.002,
f(x)=474.7+74.1x, r2=0.417). Water temperature in
the inset was calculated from the temperatures measured over the full period
since the previous sampling.