Energy expenditure in relation to flight speed: what is the power of mass loss rate estimates?

Kvist, Anders, Klaassen, Marcel and Lindström, Åke 1998, Energy expenditure in relation to flight speed: what is the power of mass loss rate estimates?, Journal of avian biology, vol. 29, no. 4, pp. 485-498, doi: 10.2307/3677168.

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Title Energy expenditure in relation to flight speed: what is the power of mass loss rate estimates?
Author(s) Kvist, Anders
Klaassen, MarcelORCID iD for Klaassen, Marcel
Lindström, Åke
Journal name Journal of avian biology
Volume number 29
Issue number 4
Start page 485
End page 498
Total pages 14
Publisher Wiley
Place of publication London, Eng.
Publication date 1998-12
ISSN 0908-8857
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Summary The relationship between mass loss rate and chemical power in flying birds is analysed with regard to water and heat balance. Two models are presented: the first model is applicable to situations where heat loads are moderate. i.e. when heat balance can be achieved by regulating non-evaporative heat loss, and evaporative water loss is minimised. The second model is applicable when heat loads are high, non-evaporative heat loss is maximised. and heat balance has to be achieved by regulating evaporative heat loss. The rates of mass loss of two Thrush Nightingales Luscinia luscinia and one Teal Anas crecca were measured at various flight speeds in a wind tunnel. Estimates of metabolic water production indicate that the Thrush Nightingales did not dehydrate during experimental flights. Probably, the Thrush Nightingales maintained heat balance without actively increasing evaporative cooling. The Teal, however, most likely had to resort to evaporative cooling, although it may not have dehydrated. Chemical power was estimated from our mass loss rate data using the minimum evaporation model for the Thrush Nightingales and the evaporative heat regulation model for the Teal. For both Thrush Nightingales and the Teal, the chemical power calculated from our mass loss rate data showed a greater change with speed (more 'U-shaped' curve) than the theoretically predicted chemical power curves based on aerodynamic theory. The minimum power speeds calculated from our data differed little from theoretical predictions but maximum range speeds were drastically different. Mass loss rate could potentially be used to estimate chemical power in flying birds under laboratory conditions where temperature and humidity are controlled. However, the assumptions made in the models and the model predictions need further testing.
Language eng
DOI 10.2307/3677168
Field of Research 060603 Animal Physiology - Systems
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©1998, Wiley
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