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147 results for “telomere length”
Assortative mating by telomere length under different environmental conditions in the brown booby, a long-lived seabird
<p class="NoteLevel11"><span>Life-history strategies covary with a suite of behavioral and physiological responses along a slow-fast continuum, known as pace-of-life-syndrome. Particularly in long-lived species, pace-of-life is expected to influence breeding strategies, making it a potentially important factor in mate choice. It has been proposed that telomere length (TL) may integrate individual physiological components and survival prospects that underlie individual differences in pace-of-life. In the brown booby (Sula leucogaster), a long-lived seabird, we investigated whether TL may indicate individual pace-of-life by examining how it relates to mitochondrial DNA copy number (mtDNAcn), corticosterone (cort) levels, and skin coloration—a condition-dependent sexual trait. Then, we tested whether there is assortative mating by TL, and whether the degree of TL similarity between partners influences an individual's likelihood of changing mates and physiological state (mtDNAcn and cort levels). Because environmental conditions may have important effects on the individual pace-of-life, the study was performed in two colonies with contrasting breeding conditions. We found that TL was positively related to mtDNAcn (but not cort levels), suggesting that individuals with shorter telomeres have reduced mitochondrial activity and aerobic capacity. TL was reflected in sexual coloration, but only in the colony with good breeding conditions. There was positive assortative mating by TL, however the degree of assortative mating was unrelated to mtDNAcn, cort levels and the probability of mate change, which greatly varied between the two colonies. Our results suggest that TL </span><span>might be an indicator of the individual pace-of-life and may influence mating patterns. </span><span>Importantly, contrasting environmental conditions </span><span>influenced the link between TL and sexual coloration and the propensity of individuals to change mate, highlighting the importance of environmental variation on breeding strategies.</span><span> </span></p>
Telomere length and rate of change, as they relate to body size and longevity
<p><span>Telomeres, the terminal repetitive DNA sequences at the ends of linear chromosomes, have strong associations with longevity in some major taxa. Longevity has been linked to rate of decline in telomere length in birds and mammals, and absolute telomere length seems to be associated with body mass in mammals. Using a phylogenetic comparative method and 30 species of birds, we examined longevity (reflected by maximum lifespan), absolute telomere length, the rate of change in telomere length (TROC), and body mass (often strongly associated with longevity) to ascertain their degree of association. We divided lifespan into two life-history components, one reflected by body size (measured as body mass), and a component that was statistically independent of body mass. While both lifespan and body mass were strongly associated with a family tree of the species (viz., the phylogeny of the species), telomere measures were not. Telomere length was not significantly associated with longevity or body mass, or our measure of mass-independent lifespan. TROC, however, was strongly associated with mass-independent lifespan, but only to a much lesser degree at best with body mass-predicted lifespan. Our results supported an association of TROC and longevity, in particular longevity that was independent of body size and part of the pace-of-life syndrome of life histories.</span></p>
Code and data for "Telomere length vary with sex, hatching order and year of birth in little owls, Athene noctua"
<p>Datafile and R code of the statistical analyses published in the article "telomere length vary with sex, hatching order and year of birth in little owls, <em>Athene noctua</em>".</p>
Subtle Energy Transmission and Tao Calligraphy Mindfulness in Telomere Length in Peripheral Blood Leukocytes
ClinicalTrials.gov study NCT06357663. IPD Sharing: YES. Countries: 1. Publications: 28.
Genomic offset, telomere length, and abundance trends in Yellow Warblers
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Data from: Sex-specific effects of experimental ectoparasite infestation on telomere length in great tit nestlings
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Causes and consequences of variation in early‐life telomere length in a bird metapopulation
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Artificial size selection experiment reveals telomere length dynamics and fitness consequences in a wild passerine
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Anthropogenic noise is associated with telomere length and carotenoid-based coloration in free-living nestling songbirds
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Telomere dataset used for calculating bulk and chromosome specific telomere length
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Data from: Sex-specific telomere length and dynamics in relation to age and reproductive success in Cory’s Shearwaters
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Data from: Sex- and tissue-specific differences in telomere length in a reptile
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Data for: Telomere length predicts timing and intensity of migratory behavior in a nomadic songbird
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Telomere length and rate of change, as they relate to body size and longevity
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A putative telomerase activator has tissue-specific effects on telomere length in a developing songbird
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Data from: Offspring telomere length in the long lived Alpine swift is negatively related to the age of their biological father and foster mother
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Data from: The environmental and genetic determinants of chick telomere length in Tree Swallows ( Tachycineta bicolor )
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Pleiotropic effects of melanin pigmentation: Haemoparasite infection intensity but not telomere length is associated with morph in black sparrowhawks
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Telomere length links with physiological phenotype and breeding patterns in a long-lived seabird
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Estimation of environmental, genetic and parental age at conception effects on telomere length in a wild mammal
<p class="MsoNoSpacing">Understanding individual variation in fitness-related traits requires separating the environmental and genetic determinants. Telomeres are protective caps at the ends of chromosomes that are thought to be a biomarker of senescence as their length predicts mortality risk and reflect the physiological consequences of environmental conditions. The relative contribution of genetic and environmental factors to individual variation in telomere length is however unclear, yet important for understanding its evolutionary dynamics. In particular, the evidence for transgenerational effects, in terms of parental age at conception, on telomere length is mixed. Here, we investigate the heritability of telomere length, using the 'animal model', and parental age at conception effects on offspring telomere length in a wild population of European badgers (<i>Meles meles</i>). While we found no heritability of telomere length and low evolvability (<0.001), our power to detect heritability was low and a repeatability of 2% across individual lifetimes provides a low upper limit to ordinary narrow-sense heritability. However, year (25%) and cohort (3%) explained greater proportions of the phenotypic variance in telomere length. There was no support for cross-sectional or within-individual parental age at conception effects on offspring telomere length. Our results indicate a lack of transgenerational effects through parental age at conception and a low potential for evolutionary change in telomere length in this population. Instead, we provide evidence that individual variation in telomere length is largely driven by environmental variation in this wild mammal.</p>
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