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1 July 2010 Socially Induced Synchronization of Every-Other-Day Egg Laying in a Seabird Colony
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Abstract

Spontaneous oscillator synchrony has been documented in a wide variety of electrical, mechanical, chemical, and biological systems, including the menstrual cycles of women and estrous cycles of Norway Rats (Rattus norvegicus). In temperate regions, many colonial birds breed seasonally in a time window set by photoperiod; some studies have suggested that heightened social stimulation in denser colonies can lead to a tightened annual reproductive pulse. It has been unknown, however, whether the analog of menstrual synchrony occurs in birds—that is, whether avian ovulation cycles can synchronize on a daily timescale within the annual breeding pulse. We report every-other-day clutch-initiation and egg-laying synchrony in a breeding colony of Glaucous-winged Gulls (Larus glaucescens) and show that the level of synchrony declined with decreasing colony density. We also pose a mathematical model based on the hypothesis that preovulatory luteinizing hormone surges synchronize through social stimulation. Model predictions are consistent with observations. Finally, we suggest a procedure for identifying synchronous egg laying in other colonies and species.

© 2010 by The American Ornithologists' Union. 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/reprintInfo.asp.
Shandelle M. Henson, James L. Hayward, J. M. Cushing, and Joseph C. Galusha "Socially Induced Synchronization of Every-Other-Day Egg Laying in a Seabird Colony," The Auk 127(3), 571-580, (1 July 2010). https://doi.org/10.1525/auk.2010.09202
Received: 14 October 2009; Accepted: 1 March 2010; Published: 1 July 2010
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