title: Selective disappearance of individuals with high levels of glycated haemoglobin in a free-living bird.
abstract: Although disruption of glucose homeostasis is a hallmark of ageing in humans and laboratory model organisms, we have little information on the importance of this process in free-living animals. Poor control of blood glucose levels leads to irreversible protein glycation. Hence, levels of protein glycation are hypothesized to increase with age and to be associated with a decline in survival. We tested these predictions by measuring blood glycated haemoglobin in 274 adult collared flycatchers of known age and estimating individual probability of recapture in the following 2 years. Results show a strong decrease in glycated haemoglobin from age 1 to 5 years and an increase thereafter. Individuals with high levels of glycated haemoglobin had a lower probability of recapture, even after controlling for effects of age and dispersal. Altogether, our findings suggest that poor control of glucose homoeostasis is associated with lower survival in this free-living bird population, and that the selective disappearance of individuals with the highest glycation levels could account for the counterintuitive age-related decline in glycated haemoglobin in the early age categories.
authors.affiliation: Laboratoire Biométrie et Biologie Evolutive, Université de Lyon-Université Claude Bernard Lyon 1-CNRS, Villeurbanne Cedex, France Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland charlotte.recapet@normalesup.org.
authors.forename: Charlotte
authors.identifier: 0000-0001-5414-8412
authors.initials: C
authors.lastname: Récapet
authors.affiliation: Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland.
authors.forename: Adélaïde
authors.initials: A
authors.lastname: Sibeaux
authors.affiliation: Département de Sciences Biologiques, Université de Montréal, Montreal, Canada.
authors.forename: Laure
authors.initials: L
authors.lastname: Cauchard
authors.affiliation: Laboratoire Biométrie et Biologie Evolutive, Université de Lyon-Université Claude Bernard Lyon 1-CNRS, Villeurbanne Cedex, France Animal Ecology, Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden.
authors.forename: Blandine
authors.initials: B
authors.lastname: Doligez
authors.affiliation: Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, UK.
authors.forename: Pierre
authors.initials: P
authors.lastname: Bize
mesh_terms: D000375:Aging; D000818:Animals; D006442:Glycated Hemoglobin; D020308:Songbirds
chemical_list: D006442:Glycated Hemoglobin
keywords: Ficedula albicollis; ageing; collared flycatcher; diabetes; glycation; survival