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BMC Ecology 12, 1 (2012) 17
Effects of brood size manipulation and common origin on phenotype and telomere length in nestling collared flycatchers.
Marie Voillemot 1, Kathryn Hine 1, Sandrine Zahn 2, François Criscuolo 2, Lars Gustafsson 3, Blandine Doligez 4, Pierre Bize 1, 4
(18/08/2012)

ABSTRACT: BACKGROUND: Evidence is accumulating that telomere length is a good predictor of life expectancy, especially early in life, thus calling for determining the factors that affect telomere length at this stage. Here, we investigated the relative influence of early growth conditions and origin (genetics and early maternal effects) on telomere length of collared flycatchers (Ficedula albicollis) at fledging. We experimentally transferred hatchlings among brood triplets to create reduced, control (i.e. unchanged final nestling number) and enlarged broods. RESULTS: Although our treatment significantly affected body mass at fledging, we found no evidence that increased sibling competition affected nestling tarsus length and telomere length. However, mixed models showed that brood triplets explained a significant part of the variance in body mass (18%) and telomere length (19%), but not tarsus length (13%), emphasizing that unmanipulated early environmental factors influenced telomere length. These models also revealed low, but significant, heritability of telomere length (h2 = 0.09). For comparison, the heritability of nestling body mass and tarsus length was 0.36 and 0.39, respectively, which was in the range of previously published estimates for those two traits in this species. CONCLUSION: Those findings in a wild bird population demonstrate that telomere length at the end of the growth period is weakly, but significantly, determined by genetic and/or maternal factors taking place before hatching. However, we found no evidence that the brood size manipulation experiment, and by extension the early growth conditions, influenced nestling telomere length. The weak heritability of telomere length suggests a close association with fitness in natural populations.
1 :  Department of Ecology and Evolution
Université de Lausanne
2 :  Département Ecologie, Physiologie et Ethologie (DEPE-IPHC)
CNRS : UMR7178 – Université de Strasbourg
3 :  Evolutionary Biology Centre
Uppsala University
4 :  Laboratoire de Biométrie et Biologie Evolutive (LBBE)
Université Claude Bernard - Lyon I (UCBL) – CNRS : UMR5558 – INRIA
Sciences du Vivant/Biodiversité/Evolution

Sciences de l'environnement

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