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Light utilization efficiency in photosynthetic microbial mats.

Mohammad A A Al-Najjar1, Dirk de Beer, Michael Kühl

  • 1Max-Planck Institute for Marine Microbiology, Bremen, Germany. malnajja@mpibremen.de

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Photosynthetic microbial mats conserve <1% of absorbed light energy, dissipating most as heat. Maximum photosynthetic efficiency, limited by light and mat structure, was lower than theoretical limits.

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Area of Science:

  • Microbial Ecology
  • Photosynthesis Research
  • Biogeochemistry

Background:

  • Photosynthetic microbial mats harbor diverse phototrophic communities.
  • Understanding light energy budgets is crucial for microbial mat ecosystem function.
  • Variations in mat structure and pigment concentration influence light absorption and utilization.

Purpose of the Study:

  • To compare light energy budgets in photosynthetic microbial mats.
  • To determine the efficiency of light energy conservation by photosynthesis.
  • To identify factors affecting photosynthetic efficiency in microbial mats.

Main Methods:

  • Combined microsensor measurements of irradiance, temperature, and oxygen (O2).
  • Analysis of phototrophic community structure, pigment concentrations, and euphotic zone thickness.
  • Calculation of light energy budgets and photosynthetic efficiency.

Main Results:

  • In all mats, <1% of absorbed light was conserved via photosynthesis at high irradiance; the rest was dissipated as heat.
  • Maximum photosynthetic efficiency under light-limiting conditions ranged from 4.5% to 16.2%, below the theoretical maximum of 27.7%.
  • Photosynthetic efficiency correlated positively with light attenuation and photopigment concentration, favoring thinner, denser euphotic zones.

Conclusions:

  • Microbial mats exhibit lower photosynthetic efficiency than open canopy ecosystems due to light-hindering, photosynthetically inactive components.
  • Photosynthetically inactive components contribute significantly (40-80%) to light absorption in microbial mats.
  • Mat structure, pigment concentration, and light availability are key determinants of photosynthetic efficiency in microbial mats.