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Related Experiment Video

Updated: Jun 10, 2025

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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Tiny comets under the sea.

B B Cael1, Lionel Guidi2,3

  • 1National Oceanography Centre, Southampton, UK.

Science (New York, N.Y.)
|October 10, 2024
PubMed
Summary

Marine snow, composed of organic material, sinks slower due to mucus. This mucus drag significantly impacts ocean biogeochemical cycles.

Area of Science:

  • Oceanography
  • Biogeochemistry
  • Marine Biology

Background:

  • Marine snow is a crucial pathway for carbon export in the ocean.
  • The physical properties of marine snow, such as aggregation and sinking rates, influence its fate and ecological impact.
  • Mucus can alter the properties of sinking particles.

Purpose of the Study:

  • To investigate the effect of mucus on the sinking velocity of marine snow.
  • To assess the potential biogeochemical consequences of altered marine snow dynamics.

Main Methods:

  • Laboratory experiments simulating marine snow aggregation and sinking.
  • Measurement of sinking speeds under varying mucus concentrations.
  • Modeling of particle flux and carbon export.

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Main Results:

  • Marine snow aggregates exhibit significantly reduced sinking velocities when coated in mucus.
  • The degree of velocity reduction is proportional to mucus content.
  • This drag effect can lead to increased particle residence time in the water column.

Conclusions:

  • Mucus production by marine organisms can substantially slow the sinking of marine snow.
  • This 'mucus drag' has significant implications for ocean carbon cycling and nutrient transport.
  • Further research is needed to quantify this effect across different marine environments.