Growth and energy requirements of captive-reared Common Loon (Gavia immer) chicks
- F. Fournier, W.H. Karasov, K.P. Kenow, and M.W. Meyer
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.
Additional publication details
- Publication type:
- Publication Subtype:
- Journal Article
- Growth and energy requirements of captive-reared Common Loon (Gavia immer) chicks
- Series title:
- The Auk
- Year Published:
- American Ornithological Society
- 10 p.
- First page:
- Last page: