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Growth and energy requirements of captive-reared Common Loon (Gavia immer) chicks

Auk

By:
, , , and
DOI: 10.1642/0004-8038(2007)124[1158:GAEROC]2.0.CO;2

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Abstract

We measured the energy requirements during postnatal development of six hand-reared Common Loon (Gavia immer) chicks using continuous feeding trials and doubly labeled water. At fledging, the mean (?? SE) body mass of chicks was 3,246 ?? 51 g. They reached asymptotic body mass in ???66 days and had a mean growth rate constant of 0.089 ?? 0.002 day-1, which was greater than growth rate constants of other, similar-sized precocial birds. Between hatch and day 66, chicks allocated 16.5% of their metabolizable energy to new tissue, lower than the average for other bird species (20%), which might be expected considering their precocial mode of development. There was a developmental change in the assimilation efficiency of food (metabolizable energy coefficient), with a mean of 0.64 ?? 0.03 in chicks aged 21 days, rising to 0.83 ?? 0.07 in chicks aged 35 days. ?? The American Ornithologists' Union, 2007.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Growth and energy requirements of captive-reared Common Loon (Gavia immer) chicks
Series title:
Auk
DOI:
10.1642/0004-8038(2007)124[1158:GAEROC]2.0.CO;2
Volume
124
Issue:
4
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Auk
First page:
1158
Last page:
1167