ISSN:
1751-8369
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geography
,
Geosciences
Notes:
Studies of wild and captive Willow and Svalbard Ptarmigan hens have allowed us to estimate the daily energy cost during incubation. It was similar for the two species, varying between 70-85 kcal per day depending on number of eggs, nest insulation, ambient temperature, number of foraging periods and total time spent away from the nest. Daily energy cost during incubation was 15 - 20% above resting metabolic rate in non-incubating hens but only 45 - 55% of that in free-living non-incubating hens. Incubating hens reduced their energy expenditure through high nest attentiveness. A reduction in food intake during incubation led to loss in body weight.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1751-8369.1987.tb00356.x
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