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Estimating the Effect of Wind on Avian Metabolic Rate with Standard Operative Temperature

George S. Bakken
The Auk
Vol. 107, No. 3 (Jul., 1990), pp. 587-594
Stable URL: http://www.jstor.org/stable/4087923
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Estimating the Effect of Wind on Avian Metabolic Rate with Standard Operative Temperature
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Abstract

I develop a simplified procedure to estimate the effect of wind on avian energy-use rates from published and unpublished studies of 10 passerine and 7 nonpasserine species. Below the lower critical temperature, energy-use rates of passerines resting in the dark can be estimated as that of a bird of the same species in a metabolism chamber set to the standard operative temperature, $T_{{\rm es}}$ of the habitat, defined as $T_{{\rm es}}=T_{{\rm b}}-(1+0.26\sqrt{u})(T_{{\rm b}}-T_{{\rm e}})$. Wind speed is u, and T b is body temperature. Operative temperature (T e), is ordinarily close to air temperature for birds resting at night, but T e can include the effects of thermal and solar radiation. The 95% confidence interval for predictions of the average metabolic rate of a passerine is ±9.3% for air speed up to 4 m/s and temperatures below the thermal neutral zone. The procedure also appears valid for some, but not all, nonpasserines.

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