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Radiative Energy Budgets in a Microbial Mat Under Different Irradiance and Tidal Conditions.

S Haro1,2, K E Brodersen3, J Bohórquez4,5

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Tidal cycles significantly impact microphytobenthic primary production by altering the radiative energy budget. Emersion leads to higher sediment temperatures and reduced light use efficiency, affecting microbial mat metabolism and ecological outcomes.

Keywords:
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Area of Science:

  • Marine ecology
  • Photosynthesis research
  • Microbial mat ecosystems

Background:

  • Tidal cycles influence coastal environments, affecting light and temperature.
  • Microphytobenthic communities are key primary producers in intertidal zones.
  • Radiative energy balance is crucial for understanding photosynthetic processes.

Purpose of the Study:

  • To investigate the effect of tidal stages (immersion vs. emersion) on the radiative energy budget of microbial mats.
  • To quantify changes in light absorption, heat flux, and temperature during tidal cycles.
  • To assess the impact of these changes on photosynthetic efficiency and light use.

Main Methods:

  • Utilized microsensor measurements for oxygen, temperature, and scalar irradiance.
  • Estimated radiative energy budget in a coastal microbial mat under controlled immersion and emersion conditions.
  • Analyzed light use efficiency at varying irradiance levels.

Main Results:

  • Total absorbed light energy was higher during immersion due to lower mat reflectance.
  • Most absorbed light energy (>97%) was dissipated as heat, regardless of tidal stage.
  • Sediment temperature increased by ~2.5°C during emersion at high irradiance (800 μmol photons m⁻² s⁻¹).
  • Light use efficiency decreased by ~30% during emersion compared to immersion at high irradiance, linked to sediment warming and non-photochemical quenching.

Conclusions:

  • Tidal stage significantly alters the radiative energy balance and temperature of microbial mats.
  • Warming during emersion reduces photosynthetic light use efficiency, impacting primary production.
  • These findings have significant ecological consequences for microbial mat metabolism and coastal ecosystems.