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Can Antarctic lichens acclimatize to changes in temperature?

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Antarctic lichens show varied responses to rising temperatures. While some species struggle, a widespread lichen can recover by boosting photosynthesis, indicating species-specific adaptations to climate change.

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Area of Science:

  • * Ecology
  • * Physiology
  • * Climate Change Biology

Background:

  • * The Antarctic Peninsula's tundra biome faces rapid temperature shifts.
  • * Lichens are key drivers in this ecosystem and require physiological plasticity.
  • * Understanding lichen responses to warming is crucial for predicting ecosystem changes.

Purpose of the Study:

  • * To investigate the net photosynthesis and respiration responses of three Antarctic lichen species to increased temperatures.
  • * To test the hypothesis that thermal acclimation can mitigate negative temperature effects.
  • * To assess the role of physiological plasticity in lichen survival under warming conditions.

Main Methods:

  • * A controlled growth chamber experiment simulating intermediate and extreme temperature increases over six weeks.
  • * Measurement of net photosynthesis and respiration rates in three Antarctic lichen species.
  • * Evaluation of photobiont vitality and lichen survival.

Main Results:

  • * No tested species could acclimate respiration to down-regulate temperature-driven losses.
  • * Two Antarctic-restricted species showed severe photobiont damage above 15°C, exceeding their survival limits.
  • * A widespread lichen species recovered by increasing net photosynthesis, demonstrating resilience.

Conclusions:

  • * Lichen responses to temperature are species-specific, involving separate acclimation processes for photo- and mycobionts.
  • * High variability in species' temperature sensitivity complicates predictions of Antarctic community composition.
  • * Lichen species with broader ecological amplitudes may be favored in a warming Antarctic climate.