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Estuarine biofilm patterns: modern analogues for Precambrian self‐organization
van de Vijsel, R.C.; van Belzen, J.; Bouma, T.J.; van der Wal, D.; Cusseddu, V.; Purkis, S.J.; Rietkerk, M.; van de Koppel, J. (2020). Estuarine biofilm patterns: modern analogues for Precambrian self‐organization. Earth Surf. Process. Landforms 45(5): 1141-1154. https://dx.doi.org/10.1002/esp.4783

Additional info:
In: Earth Surface Processes and Landforms: the Journal of the British Geomorphological Research Group. John Wiley/Wiley: Chichester, Sussex; New York. ISSN 0197-9337; e-ISSN 1096-9837, more
Peer reviewed article  

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Keywords
    Marine; Brackish water; Fresh water
Author keywords
    biogeomorphology; long-term morphodynamics; ridges and runnels; bedforms; biostabilization; biofilms; algal mats; self-organization; autogenic dynamics; stromatolites; microbially induced sedimentary structures; microbialites; sedimentary record; paleoenvironment

Authors  Top 
  • van de Vijsel, R.C., more
  • van Belzen, J., more
  • Bouma, T.J., more
  • van der Wal, D., more
  • Cusseddu, V.
  • Purkis, S.J.
  • Rietkerk, M.
  • van de Koppel, J., more

Abstract
    This field and laboratory study examines whether regularly patterned biofilms on present‐day intertidal flats are equivalent to microbially induced bedforms found in geological records dating back to the onset of life on Earth. Algal mats of filamentous Vaucheria species, functionally similar to microbial biofilms, cover the topographic highs of regularly spaced ridge–runnel bedforms. As regular patterning is typically associated with self‐organization processes, indicators of self‐organization are tested and found to support this hypothesis. The measurements suggest that biofilm‐induced sediment trapping and biostabilization enhance bedform relief, strength and multi‐year persistence. This demonstrates the importance of primitive organisms for sedimentary landscape development. Algal‐covered ridges consist of wavy‐crinkly laminated sedimentary deposits that resemble the layered structure of fossil stromatolites and microbially induced sedimentary structures. In addition to layering, both the morphological pattern and the suggested formation mechanism of the recent bedforms are strikingly similar to microbialite strata found in rock records from the Precambrian onwards. This implies that self‐organization was an important morphological process in times when biofilms were the predominant sessile ecosystem. These findings furthermore emphasize that self‐organization dynamics, such as critical transitions invoking ecosystem emergence or collapse, might have been captured in fossil microbialites, influencing their laminae. This notion may be important for paleoenvironmental reconstructions based on such strata.

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