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Drift in ocean currents impacts intergenerational microbial exposure to temperature.

Martina A Doblin1, Erik van Sebille2

  • 1Plant Functional Biology and Climate Change Cluster, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia; Martina.Doblin@uts.edu.au.

Proceedings of the National Academy of Sciences of the United States of America
|May 4, 2016
PubMed
Summary
This summary is machine-generated.

Ocean currents expose microbes to greater temperature changes than previously thought. This variability favors microbes with broad thermal tolerance, enhancing their ability to adapt to ocean warming.

Keywords:
advectionevolutionmicrobial ecologyplanktonplasticity

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Area of Science:

  • Marine microbiology
  • Oceanography
  • Climate change science

Background:

  • Microbes are essential to marine ecosystems.
  • Current models of ocean warming impacts on microbes do not account for thermal changes during transport.
  • This omission may lead to inaccurate predictions of microbial responses to climate change.

Purpose of the Study:

  • To investigate the impact of ocean currents on microbial thermal exposure.
  • To determine how temperature variability during transport affects microbial populations.
  • To assess the implications for microbial adaptation to ocean warming.

Main Methods:

  • Analysis of along-trajectory temperature variability for upper-ocean microbes.
  • Comparison of dynamic thermal exposure with static seasonal fluctuations.
  • Assessment of the influence of ocean currents and location on thermal variability.

Main Results:

  • Upper-ocean microbes experience temperature variability up to 10 °C greater than static estimates.
  • Thermal variability during transport is location-dependent.
  • Drift in ocean currents increases microbial thermal exposure.

Conclusions:

  • Microbial populations with broad thermal tolerance are better equipped to survive transport and colonize new habitats.
  • Advection influences microbial community assembly, favoring plasticity and evolvability in regions with strong currents and high thermal fluctuations.
  • Microbial communities in the sub-Antarctic, North Pacific, and North Atlantic show the greatest potential for adaptation to ocean warming due to their inherent plasticity.