Distinct telomere differences within a reproductively bimodal common lizard population

Area of Science:

• Evolutionary Biology
• Reproductive Strategies
• Gerontology

Background:

• Reproductive modes (oviparity vs. viviparity) influence life history, ageing, and longevity.
• Telomere length, a marker of cellular health, is linked to stress and survival.
• Reproductive bimodality within a species allows controlled comparisons of life-history traits.

Purpose of the Study:

• To investigate maternal and offspring telomere dynamics in relation to reproductive modes (oviparity, viviparity, and admixture) in the common lizard (Zootoca vivipara).
• To test the hypothesis that viviparous mothers and offspring have shorter telomeres due to higher reproductive costs, with admixed individuals showing intermediate lengths.

Main Methods:

• Studied telomere length in mothers and offspring across oviparous, viviparous, and admixed reproductive modes within a single population of Zootoca vivipara.
• Analyzed telomere dynamics to assess differences associated with reproductive strategies and potential heritable components.

Main Results:

• Contrary to predictions, viviparous mothers and offspring exhibited significantly longer telomeres compared to oviparous mothers and offspring.
• Admixed individuals showed intermediate telomere lengths, supporting a link between reproductive mode and telomere length.

Conclusions:

• Telomere length patterns in Zootoca vivipara do not align with predictions based solely on reproductive costs.
• Observed telomere differences may reflect evolved life-history divergence, potentially linked to factors like growth rate differences between reproductive modes.