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Early-breeding females experience greater telomere loss. | LitMetric

AI Article Synopsis

  • Breeding early in the season generally leads to higher reproductive success for individuals, especially females who control offspring timing, yet few choose to breed early.
  • The study hypothesized that early breeding may incur costs, specifically through accelerated aging of cells marked by telomere shortening.
  • Analyzing data from dark-eyed juncos, researchers found that early-breeding females experienced greater telomere loss related to cooler temperatures, indicating that environmental conditions may drive this accelerated aging.

Article Abstract

Annual reproductive success is often highest in individuals that initiate breeding early, yet relatively few individuals start breeding during this apparently optimal time. This suggests that individuals, particularly females who ultimately dictate when offspring are born, incur costs by initiating reproduction early in the season. We hypothesized that increases in the ageing rate of somatic cells may be one such cost. Telomeres, the repetitive DNA sequences on the ends of chromosomes, may be good proxies of biological wear and tear as they shorten with age and in response to stress. Using historical data from a long-term study population of dark-eyed juncos (Junco hyemalis), we found that telomere loss between years was greater in earlier breeding females, regardless of chronological age. There was no relationship between telomere loss and the annual number of eggs laid or chicks that reached independence. However, telomere loss was greater when temperatures were cooler, and cooler temperatures generally occur early in the season. This suggests that environmental conditions could be the primary cause of accelerated telomere loss in early breeders.

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Source
http://dx.doi.org/10.1111/mec.14952DOI Listing

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