Figure 1.
Effects of body size and temperature on sound frequency. (a) The natural logarithm of temperature-corrected sound frequency (cycles s−1 · eE/kT; equation (1.2)) versus the natural logarithm of body mass (g) (y = −0.21x + 26.20; r2 = 0.68; n = 432). (b) The natural logarithm of body mass-corrected sound frequency (cycles s−1 · M1/4; equation (1.2)) versus inverse absolute temperature, 1/kT, where k is Boltzmann's constant and T is the absolute temperature in degrees Kelvin (y = −0.53x + 21.66; r2 = 0.50; n = 432). Note that equation (1.2) predicts slopes of −0.25 and −0.65 for panels (a,b), respectively. Violet, Actinopterygii; green, Amphibia; orange, Aves; blue, Crustacea; black, Insecta; yellow, Mammalia; red, Reptilia; pink, Sauropsida.