Nutritional Condition of Water Pipits on Arctic Nesting Grounds
Irving L. 1960. Nutritional Condition of Water Pipits on Arctic Nesting Grounds. The Condor. 62(6):469-472
On arrival at arctic nesting grounds at Anaktuvuk Pass, Alaska, and Old Crow, Yukon Territory, male Water Pipits identified from 50 specimens as Anthus spinoletta rubescens were three grams heavier and fatter than just before nesting. At the time of arrival on May 10, testes were less than half maximum length; maximum size was attained by May 14. Thereafter the size of testes did not change during June, but by May 21 weights had declined and most males were lean. The first egg was laid on June 1. While the males lost weight during mating, females held or gained weight until after laying.
- Type
- Journal Article
- Authors
- Irving, Laurence
- Units
- ARCN , BELA , CAKR , GAAR , KOVA , NOAT
- Keywords
- American Pipit, Anaktuvuk Pass, Arctic, Birds, Breeding Biology, Brooks Range, Diet, fat, Foods, Foraging, Migration, Nesting, Old Crow, Passerines, weights, Yukon