Life-History Dynamics in Amphibians and Reptiles
Summary
Life-history dynamics in amphibians and reptiles encompass the timing and allocation of resources to growth, reproduction and survival across an individual’s lifespan. These traits vary widely among taxa, from rapid maturation and short longevity in many tropical frogs to delayed maturation and extended lifespans in temperate newts and tortoises. Environmental factors such as temperature, precipitation seasonality, latitude and altitude shape the evolution of growth trajectories, age at sexual maturity, clutch or litter size, and adult survival rates. Trade-offs between reproductive effort and longevity underpin adaptive strategies, with some species investing heavily in single reproductive events while others spread risk through repeated breeding over many years. Viviparity and morphological specialisations further diversify these strategies, influencing habitat use and vulnerability to environmental change. Understanding such variation is crucial for predicting population responses to habitat loss, climate change and emerging diseases, and for formulating conservation interventions.
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Life-History Dynamics in Amphibians and Reptiles publication trend
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Technical terms
Life-history traits: Characteristics such as age at sexual maturity, growth rate, reproductive output and lifespan that determine individual fitness and population dynamics.
Fecundity: The potential reproductive capacity of an individual, typically expressed as the number of eggs or offspring produced per breeding event or season.
Skeletochronology: A histological method for estimating individual age by counting periodic growth rings in bones or phalanges.
Lines of Arrested Growth (LAGs): Distinct histological markers in bone tissue corresponding to pauses in growth, often used to infer annual age increments.
Von Bertalanffy growth model: A mathematical function describing how body size increases over time, widely applied to vertebrate growth studies.
References
- Tropical anurans mature early and die young: Evidence from eight Afromontane Hyperolius species and a meta-analysis. PLOS ONE (2017).
- Population demography of an endangered lizard, the Blue Mountains Water Skink. BMC Ecology and Evolution (2013).
- Age, size and body condition do not equally reflect population response to habitat change in the common spadefoot toad Pelobates fuscus. PeerJ (2021).
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