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Related Experiment Videos

Structure/function/activity relationships in marine snow. Current understanding and suggested research thrusts.

G G Leppard1

  • 1Aquatic Ecosystem Protection Branch, National Water Research Institute, Burlington, Ontario, Canada.

Annali Dell'Istituto Superiore Di Sanita
|March 18, 2000
PubMed
Summary

Marine snow

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Area of Science:

  • Marine biology
  • Oceanography
  • Biogeochemistry

Background:

  • Marine snow contributes to mucilage phenomena in the Northern Adriatic Sea.
  • Extracellular polymeric substances form colloidal fibrils, key components of marine snow matrix.
  • These fibrils create 3D networks influencing floc properties and settling behavior.

Purpose of the Study:

  • To explore the relationship between marine snow ultrastructure, chemistry, and environmental properties.
  • To investigate the role of colloidal matrix materials in anomalous floc settling.
  • To recommend new monitoring methods for the Northern Adriatic Sea.

Main Methods:

  • Transmission electron microscopy (TEM) to visualize colloidal fibrils (0.005 micron diameter).
  • Analysis of marine snow floc ultrastructure, including fibril-delimited channels.

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  • Development of methods for chemical quantification of colloidal organic carbon and TEM-based fibril estimation.

    • Main Results:

    • TEM revealed complex fibril networks and channels within marine snow flocs.
    • These structures are postulated to play a role in anomalous settling behavior.
    • Colloidal matrix materials may provide early indicators of anomalous floc behavior.

    Conclusions:

    • Understanding marine snow ultrastructure is crucial for explaining mucilage phenomena.
    • New monitoring methods using colloidal organic carbon quantification and TEM are proposed.
    • These methods can help predict anomalous floc behavior in the Northern Adriatic Sea.