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- W2056584243 abstract "In many species of bird, eggs laid late in the laying period hatch after a shorter incubation period than do eggs laid early. These seasonal declines in incubation period are generally thought to confer evolutionary advantages, but the proximate mechanisms that underlie them are poorly understood. Seasonal declines in incubation period are usually attributed to: (1) seasonal increases in ambient air temperatures; (2) seasonal changes in the behaviour of incubating birds; and/or (3) seasonal declines in egg size. In a previous study, Common Guillemot Una aalge incubation periods declined with laying date at a low-Arctic colony. As there was no support for hypotheses 1 or 2, it was suggested that this occurred because egg size declined with laying date, but eggs were not measured in that study. We recorded similar seasonal declines in the incubation periods of the single eggs laid by Brünnich's Guillemots Una lomvia at two low-Arctic colonies in four years. Neither seasonal variation in ambient air temperatures, nor in the behaviour of incubating adults, appeared to cause the declines. As predicted for Common Guillemots, incubation period increased with egg size among Briinnich's Guillemots, in one of two years. However, incubation period declined with laying date in the absence of corresponding declines in egg size. We conclude that none of the three commonly proposed proximate mechanisms adequately explains the seasonal variation in guillemot incubation periods. Several testable, alternative mechanisms are explored." @default.
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- W2056584243 date "2001-01-01" @default.
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- W2056584243 title "Seasonal declines in incubation periods of Brünnich's Guillemots Una lomvia: testing proximate causes" @default.
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- W2056584243 doi "https://doi.org/10.1111/j.1474-919x.2001.tb04173.x" @default.
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