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              <p>Telomeres, repetitive sequences that protect chromosome ends, are eroded by aging processes across numerous taxa. This erosion occurs more rapidly when organisms experience harsh conditions. Therefore, relative telomere length (RTL) is commonly used in ecology as a proxy for physiological stress. Post-glacial environments typically present extreme trophic and thermal conditions to organisms attempting to colonize these areas. Using RTL in this context could help estimate the relative stress experienced by colonizing individuals. We explore this hypothesis using long-term monitoring data on the colonization of the Kerguelen Islands by brown trout (Salmo trutta), comparing RTL from individuals and populations located at different points along the colonization front. Our goal is to highlight a stress gradient along the colonization front and, potentially, to detect adaptation to the unique conditions found in deglaciating environments.</p>
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              <p>Les télomères, des séquences répétitives protégeant les extrémités des chromosomes, sont érodés par les processus de vieillissement dans de nombreux taxa. Ce processus est plus rapide lorsque les organismes sont soumis à des conditions difficiles. La longueur relative des télomères (LRT) est donc utilisée en écologie comme proxy du stress physiologique. Les environnements post glaciaires offrent ainsi généralement des conditions trophiques et thermiques extrêmes aux organismes qui tentent de coloniser ces zones. L’utilisation de la LRT dans ce contexte pourrait permettre d’estimer le stress relatif vécu par les organismes colonisateurs. Nous explorons cette hypothèse dans le cadre du suivi de la colonisation des îles Kerguelen par la truite commune, en comparant les LRT d'individus et populations localisés à différents points du front de colonisation. Notre ambition est de mettre en évidence un gradient de stress le long du front de colonisation, et à terme de détecter une adaptation à ces conditions particulières rencontrées dans les environnements en déglaciation.</p>
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