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How Thermal Patterns Change During Dehydration in Non-Vascular Epiphytic Communities.

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|July 14, 2025
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Summary

Epiphytic lichens and bryophytes significantly influence ecosystem water and thermal dynamics. Higher water content in foliose lichens and bryophytes leads to cooler, more stable temperatures, unlike crustose lichens.

Keywords:
SEMlife‐formsmicroclimatesurface thermal patternwater contentwater loss

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Area of Science:

  • Ecology
  • Environmental Science
  • Plant Biology

Background:

  • Lichens and bryophytes are poikilohydric organisms that reach equilibrium with their environment.
  • Epiphytic communities play a role in ecosystem functions like water and energy balance through substrate-atmosphere exchange.
  • Understanding how community composition affects microclimate regulation is crucial for ecological research.

Purpose of the Study:

  • To investigate the influence of epiphytic community composition on thermal patterns and water content during dehydration.
  • To test the hypothesis that variations in water content alter thermal heterogeneity, influenced by life-form diversity.
  • To analyze the direct and indirect effects of epiphytic communities on thermal and water dynamics.

Main Methods:

  • Infrared imaging was used to capture thermal patterns of eight bark sample categories with varying epiphytic compositions.
  • Structural equation modeling was employed to analyze relationships between community composition, water content, and thermal variables.
  • Water content (WC) and temperature were measured over dehydration cycles for different lichen and bryophyte communities.

Main Results:

  • Foliose lichens and bryophytes, with higher water content, showed negative correlations with thermal variables, indicating cooler temperatures.
  • Crustose lichens exhibited opposing trends, with lower water content and higher final temperatures.
  • Samples with foliose lichens and bryophytes retained water longer and maintained more stable temperatures compared to those dominated by crustose lichens.

Conclusions:

  • Epiphytic community composition, particularly the dominance of foliose lichens and bryophytes versus crustose lichens, significantly impacts water retention and thermal regulation.
  • Morphological traits, such as hydrophilic versus hydrophobic properties and surface-to-volume ratios, explain the observed differences in water and thermal dynamics.
  • Non-vascular epiphytic communities are important regulators of fine-scale thermal and water dynamics and should be integrated into ecological studies.