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Phenotypic plasticity may help lizards cope with increasingly variable temperatures.

Liang Ma1,2, Bao-Jun Sun1, Peng Cao3

  • 1Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, People's Republic of China.

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|March 30, 2018
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Summary
This summary is machine-generated.

Increased temperature variability due to climate change impacts lizard reproduction and offspring growth. Phenotypic plasticity is key for animals adapting to changing thermal environments.

Keywords:
Climate changePhysiological compensationReptileTemperature variabilityThermoregulation

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Herpetology

Background:

  • Climate change is increasing global temperatures and temperature variability.
  • The biological impacts of rising temperature variability on animal physiology and life history are not well understood.
  • Reptiles, as ectotherms, are particularly sensitive to environmental temperature fluctuations.

Purpose of the Study:

  • To investigate the effects of increased ambient temperature variability on maternal and offspring traits in viviparous lizards (Eremias multiocellata).
  • To compare the responses of lizards exposed to constant daily maximum (CDM) versus variable daily maximum (VDM) thermal environments.

Main Methods:

  • Gravid Eremias multiocellata lizards were experimentally exposed to two distinct thermal treatments: constant daily maximum (CDM) and variable daily maximum (VDM) temperatures, maintaining the same average temperature.
  • Maternal reproductive outputs (parturition timing, litter size, litter mass) were recorded.
  • Offspring physiological and growth parameters (preferred body temperature, metabolic rate, growth rate, size) were assessed.

Main Results:

  • Females in the VDM treatment exhibited delayed parturition but had comparable litter sizes and masses to those in the CDM treatment.
  • Offspring from the VDM treatment selected higher preferred body temperatures.
  • Offspring from the VDM treatment displayed higher metabolic and growth rates, reaching similar adult sizes as CDM offspring despite a shorter pre-hibernation growth period.

Conclusions:

  • Phenotypic plasticity plays a crucial role in enabling lizards to adapt to increased temperature variability.
  • The study highlights the importance of considering temperature variability, not just average temperature, in predicting animal responses to climate change.
  • Further research into the role of phenotypic plasticity in adapting to variable thermal conditions is warranted.