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At-sea behavior varies with lunar phase in a nocturnal pelagic seabird, the swallow-tailed gull

June 10, 2013

Strong and predictable environmental variability can reward flexible behaviors among animals. We used long-term records of activity data that cover several lunar cycles to investigate whether behavior at-sea of swallow-tailed gulls Creagrus furcatus, a nocturnal pelagic seabird, varied with lunar phase in the Galápagos Islands. A Bayesian hierarchical model showed that nighttime at-sea activity of 37 breeding swallow-tailed gulls was clearly associated with changes in moon phase. Proportion of nighttime spent on water was highest during darker periods of the lunar cycle, coinciding with the cycle of the diel vertical migration (DVM) that brings prey to the sea surface at night. Our data show that at-sea behavior of a tropical seabird can vary with environmental changes, including lunar phase.

Citation Information

Publication Year 2013
Title At-sea behavior varies with lunar phase in a nocturnal pelagic seabird, the swallow-tailed gull
DOI 10.1371/journal.pone.0056889
Authors Sebastian M. Cruz, Mevin Hooten, Kathryn P. Huyvaert, Carolina B. Proaño, David J. Anderson, Vsevolod Afanasyev, Martin Wikelski
Publication Type Article
Publication Subtype Journal Article
Series Title PLoS ONE
Index ID 70040669
Record Source USGS Publications Warehouse
USGS Organization Colorado Cooperative Fish and Wildlife Research Unit