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Energy budget and prey requirements of breeding lapland longspurs Calcarius lapponicus near Barrow Alaska, U.S.A.

Arctic and Alpine Research

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Abstract

Breeding Lapland longspurs, Calcarius lapponicus, near Barrow, Alaska, have relatively constant energy demands throughout the summer; the average estimated daily energy budgets (DEBs) were 132 and 118 kJ for the male and female. Thermoregulation accounted consistently for one-quarter to one-third of the total DEB. Flight in the male and incubation in the female were major components of the DEB early in the season, whereas cost of molt was a major component for both sexes near the end of the season. Our estimates of longspur DEB based on a time-activity approach were similar to those based on a cage existence model. Minor differences are explained by increased male territorial activity, by energy savings of the female during incubation, and by contraction of the molt for both sexes within the short summer season. Male and female longspurs were estimated to capture 3000 to 10,000 seeds and insects d-1 (3-20 items min-1 foraging) for self maintenance while in summer residence near Barrow. Each adult was estimated to capture an additional 3000 insects d-1 ( 6-7 insects min-1 foraging) during the peak energy requirements to raise five young. While raising young, the maximum required capture rate of prey per time foraging for each adult occurred during the nestling stage; young are just achieving independence, however, when food supply is at a maximum.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Energy budget and prey requirements of breeding lapland longspurs Calcarius lapponicus near Barrow Alaska, U.S.A.
Series title:
Arctic and Alpine Research
Volume
18
Issue:
4
Year Published:
1986
Language:
English
Publisher:
INSTAAR, University of Colorado
Publisher location:
Boulder, CO
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
14 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Arctic and Alpine Research
First page:
415
Last page:
428
Number of Pages:
14
Country:
United States
State:
Alaska
City:
Barrow