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1 November 2009 Extended Laying Interval of Ultimate Eggs of the Eastern Bluebird
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Abstract
Proximately, clutch size is determined by the termination of the sequential pattern of egg formation and laying. Egg laying is difficult to study, and documentation of detailed patterns is scarce. We used archived video recordings of the Eastern Bluebird (Sialia sialis) to contrast the times of day of laying with variability in egg-laying intervals. Ultimate eggs were laid over a significantly longer interval than previous eggs. The extended interval over which the ultimate egg is laid could be a symptom of physiological constraints in the formation of the ultimate egg, extra resources provided to compensate the ultimate egg, and/or a late egg may become the ultimate egg because being late prevents further ovulation.
© 2009 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website, http://www.ucpressjournals.com/reprintlnfo.asp.
Caren B. Cooper, M. A. Voss and Bora Zivkovic "Extended Laying Interval of Ultimate Eggs of the Eastern Bluebird," The Condor 111(4), (1 November 2009). https://doi.org/10.1525/cond.2009.090061
Received: 6 April 2009; Accepted: 1 September 2009; Published: 1 November 2009
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