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1 December 2018 Variable laying times among King Rails (Rallus elegans)
Katie M. Schroeder, Susan B. McRae
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Abstract

Female birds tend to lay consecutive eggs in a clutch 24 h apart. Typically, this spacing results in individuals laying within a narrow interval corresponding to a time of day generalizable at the population level. In contrast to this trend, we found that females in a coastal-breeding population of King Rails (Rallus elegans) showed considerable variability in laying times. Variable laying times reveal that female King Rails are not constrained to a specific laying hour by circadian patterns of activity, as has been suggested for other species. We call for researchers to report temporal data on egg laying to revisit the evolutionary significance of laying times and to determine what factors affect, or are affected by, laying at a specific time of day.

Katie M. Schroeder and Susan B. McRae "Variable laying times among King Rails (Rallus elegans)," The Wilson Journal of Ornithology 130(4), 1036-1041, (1 December 2018). https://doi.org/10.1676/1559-4491.130.4.1036
Received: 10 October 2017; Accepted: 1 August 2018; Published: 1 December 2018
KEYWORDS
avian egg laying
conspecific brood parasitism
evolutionary ecology
laying time
rallidae
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