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Thermoregulation in the brown noddy (Anous stolidus)

journal contribution
posted on 2023-05-16, 09:42 authored by Ellis, HI, Maskrey, M, Pettit, TN, Whittow, GC
1. 1. Oxygen consumption ( V ̇O2 ), body temperature (Tb), respiratory frequency (f) and total evaporative water loss were measured in Brown Noddies exposed to air temperatures (Ta) between -0.2 and 41.9°C, in a climatic chamber. 2. 2. The thermoneutral zone of Ta was approx. 22-37°C and the V ̇O2 in the thermoneutral zone (1.031 ml/g h) was 77-80% of predicted values. 3. 3. The body temperature was characterized by its lability: even within the thermoneutral zone, there was a significant correlation with Ta. 4. 4. Exposure to low Ta resulted in shivering and a maximal increase in V ̇O2 of 129%. The minimal thermal conductance of the tissues and plumage below the lower critical Ta was 86% of the predicted value. 5. 5. At high Ta, thermal polypnea and open-beak panting were observed but the birds did not gular flutter. In some birds evaporative heat loss exceeded concurrent metabolic heat production. 6. 6. The features of thermoregulation in adult Brown Noddies are compared with those of the hatchling and also with thermoregulation in the related Sooty Tern. © 1995.

History

Publication title

Journal of Thermal Biology

Volume

20

Issue

4

Pagination

307-313

ISSN

0306-4565

Department/School

Tasmanian School of Medicine

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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