## Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

## If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. 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

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
Preview not available

## 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I develop a simplified procedure to estimate the effect of wind on avian energy-use rates from published and unpublished studies of 10 passerine and 7 nonpasserine species.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.

• 587
• 588
• 589
• 590
• 591
• 592
• 593
• 594