Socially Induced Synchronization of Every-Other-Day Egg Laying in a Seabird Colony

The Auk

J. M. Cushing¹  James L. Hayward¹  Shandelle M. Henson¹  Joseph C. Galusha¹ 

关键词: egg laying;    Glaucous-winged Gull;    Larus glaucescens;    luteinizing hormone;    mathematical model;    ovulation;    synchrony;   

DOI  :  10.1525/auk.2010.09202

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

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.

【 授权许可】

Unknown