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Journal Articles
Heat transfer from starlings sturnus vulgaris during flight
S. Ward, J.M.V. Rayner, U. Möller, D.M. Jackson, W. Nachtigall, J.R. Speakman
Journal of Experimental Biology 1999 202: 1589-1602;
S. Ward
Aberdeen Centre for Energy Regulation and Obesity, Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK and Instit
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J.M.V. Rayner
Aberdeen Centre for Energy Regulation and Obesity, Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK and Instit
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U. Möller
Aberdeen Centre for Energy Regulation and Obesity, Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK and Instit
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D.M. Jackson
Aberdeen Centre for Energy Regulation and Obesity, Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK and Instit
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W. Nachtigall
Aberdeen Centre for Energy Regulation and Obesity, Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK and Instit
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J.R. Speakman
Aberdeen Centre for Energy Regulation and Obesity, Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK, School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK and Instit
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Summary

Infrared thermography was used to measure heat transfer by radiation and the surface temperature of starlings (Sturnus vulgaris) (N=4) flying in a wind tunnel at 6–14 m s-1 and at 15–25 degrees C. Heat transfer by forced convection was calculated from bird surface temperature and biophysical modelling of convective heat transfer coefficients. The legs, head and ventral brachial areas (under the wings) were the hottest parts of the bird (mean values 6.8, 6.0 and 5.3 degrees C, respectively, above air temperature). Thermal gradients between the bird surface and the air decreased at higher air temperatures or during slow flight. The legs were trailed in the air stream during slow flight and when air temperature was high; this could increase heat transfer from the legs from 1 to 12 % of heat transfer by convection, radiation and evaporation (overall heat loss). Overall heat loss at a flight speed of 10.2 m s-1 averaged 11. 3 W, of which radiation accounted for 8 % and convection for 81 %. Convection from the ventral brachial areas was the most important route of heat transfer (19 % of overall heat loss). Of the overall heat loss, 55 % occurred by convection and radiation from the wings, although the primaries and secondaries were the coolest parts of the bird (2.2-2.5 degrees C above air temperature). Calculated heat transfer from flying starlings was most sensitive to accurate measurement of air temperature and convective heat transfer coefficients.

  • © 1999 by Company of Biologists
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Journal Articles
Heat transfer from starlings sturnus vulgaris during flight
S. Ward, J.M.V. Rayner, U. Möller, D.M. Jackson, W. Nachtigall, J.R. Speakman
Journal of Experimental Biology 1999 202: 1589-1602;
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Journal Articles
Heat transfer from starlings sturnus vulgaris during flight
S. Ward, J.M.V. Rayner, U. Möller, D.M. Jackson, W. Nachtigall, J.R. Speakman
Journal of Experimental Biology 1999 202: 1589-1602;

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