![]() ![]() This result is intriguing given the local positive population dynamics and is further discussed in the context of physiological conservation. Finally, we found that nestlings’ TL decreased over years, while nestlings’ body condition stayed unchanged over the same period. We did not find a marked effect of the environmental covariates on nestlings’ TL. There was also a negative effect of hatching rank but only for last-hatched nestlings in large clutches of 5 nestlings. In this study, our results indicated that telomeres are longer in females and, independently of sex, in nestlings with the highest body condition. ![]() Nowadays, in the studied Alsatian population, the population is increasing. Little owls’ populations in Europe showed a marked declined in the end of the 20th century. In this study, we investigated the effects of hatching rank, year of birth (2014 to 2017), sex and nest environment on TL of 137 little owls nestlings (Athene noctua). Thus, TL has been used as a physiological marker of individual quality and also as an indicator of population trend in conservation physiology. Moreover, TL is also affected by environmental stressors and/or resource-demanding situations particularly during early-life. In numerous taxa, telomeres shorten with age and telomere length (TL) is positively correlated with longevity. Telomeres are non-coding DNA sequences located at the end of linear chromosomes, protecting genome integrity.
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