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Incubation behavior of Spectacled Eiders on the Yukon-Kuskokwim Delta, Alaska

January 1, 1999

We studied incubation behavior of Spectacled Eiders (Somateria fischeri) on the Yukon-Kuskokwim Delta in 1996. We trapped 19 females on their nests and weighed them in early incubation and again at hatch. Average daily weight loss for incubating females was 16.6 ± 1.0 g day-1, which resulted in a cumulative loss of 26% of body weight throughout incubation. Nest attendance was monitored for a portion of the incubation period using temperature sensing artificial eggs. Incubation constancy averaged 90 ± 1%. Average recess length was 37.1 ± 0.9 min, and nests cooled an average of 4.2 ± 0.1°C during recesses. Recess frequency averaged 2.5 ± 0.1 recesses day-1, and most recesses (70%) occurred between 10:00 and 22:00. Incubation constancy varied among females, but was not related to changes in body weight or incubation period. There was no influence of ambient temperature on incubation recess length, however most recesses were taken during the warmest part of the day. We found considerable variation among females in patterns of daily incubation constancy, nest cooling, recess frequency, and recess length. It is not clear from our results what factors constrain incubation behavior of Spectacled Eiders, but we suggest that individual females respond to a complex suite of variables.

Publication Year 1999
Title Incubation behavior of Spectacled Eiders on the Yukon-Kuskokwim Delta, Alaska
DOI 10.2307/1370007
Authors Paul L. Flint, J.B. Grand
Publication Type Article
Publication Subtype Journal Article
Series Title Condor
Index ID 70021650
Record Source USGS Publications Warehouse