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Resting and peak metabolic rates of Arctic Tern nestlings and their relations to growth rate

journal contribution
posted on 01.07.1992, 00:00 authored by Marcel KlaassenMarcel Klaassen, C BECH
We measured resting and peak metabolism in relation to growth rate in arctic tern Sterna paradisaea chicks over the first 10 d after hatching. For chicks with varying growth rate, body mass seems to be a better predictor of resting metabolic rate rather than age. The effect of changes in growth rate on resting metabolism of arctic terms is smaller than found interspecifically in hatchlings. It is possible that difference exist in the heat increment of feeding between fast and slow growers that would further reduce the effect of growth rate on resting metabolism. Chicks that had body masses lower than 75% of that expected for their age were metabolically inferior in withstanding a thermal challenge compared with chicks of the same age but normal mass. In contrast to resting metabolic rate, the extent of peak metabolic rate is related to both body mass and age. This, in part, the maturation of the thermoregulatory system proceeds steadily with time even when body mass lags behind.

History

Journal

Physiological zoology

Volume

65

Issue

4

Season

July - August

Pagination

803 - 814

Publisher

University of Chicago Press

Location

Chicago, Ill.

ISSN

0031-935X

Language

eng

Publication classification

C Journal article; C1.1 Refereed article in a scholarly journal

Copyright notice

1992, University of Chicago Press