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Light-Enhanced Microbial Organic Carbon Yield.

John R Casey1, Sara Ferrón1, David M Karl1

  • 1Center for Microbial Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI, United States.

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|December 19, 2017
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Summary
This summary is machine-generated.

Marine microbes use light to metabolize phytoplankton-derived glycolate, increasing assimilation efficiency. This photoheterotrophy impacts ocean carbon cycling and microbial interactions in nutrient-poor waters.

Keywords:
diel cycles of microbial metabolismglycolatephotoheterotrophyphotorespirationsubstrate assimilation efficiency

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Area of Science:

  • Marine microbial ecology
  • Biogeochemistry
  • Molecular biology

Background:

  • Photoheterotrophy, using light for energy and organic compounds, is common in marine microbes.
  • This process influences microbial growth, nutrient cycling, and interactions within the marine microbial loop.

Purpose of the Study:

  • To quantify photoheterotrophic metabolism of glycolate, a key phytoplankton-derived substrate.
  • To investigate the effect of light on glycolate uptake and assimilation in oligotrophic marine environments.

Main Methods:

  • Metabolic measurements of glycolate uptake and assimilation.
  • Incubation experiments under varying light conditions.
  • Analysis of microbial community metabolism in the subtropical North Pacific Ocean.

Main Results:

  • Glycolate uptake rates varied with concentration and time of day, peaking at midday.
  • Light exposure significantly increased glycolate assimilation efficiency by approximately four-fold.
  • Increased energy demand for metabolic adjustment was directly proportional to light intensity.

Conclusions:

  • Photoheterotrophy plays a crucial role in processing phytoplankton-derived carbon in oligotrophic oceans.
  • Light influences microbial metabolic strategies, enhancing carbon assimilation efficiency.
  • This study provides direct metabolic evidence for light-driven microbial processes impacting ocean carbon cycling.