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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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A Process-Based Model for Bioturbation-Induced Mixing.

Tomás Aquino1,2, Kevin R Roche3,4, Antoine Aubeneau5

  • 1Spanish National Research Council (IDAEA - CSIC), 08034, Barcelona, Spain. tomas.aquino@idaea.csic.es.

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|October 29, 2017
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Summary
This summary is machine-generated.

This study models bioturbation, the mixing of sediments by organisms. The developed process-based model accurately predicts tracer concentrations, validating its effectiveness in quantifying ecological mixing.

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Area of Science:

  • Ecology
  • Geology
  • Environmental Science

Background:

  • Bioturbation is the mixing of soils and sediments by living organisms.
  • It plays a crucial role in sediment-water interface processes.
  • Quantifying bioturbation's mixing impact is essential for understanding natural systems.

Purpose of the Study:

  • To develop a process-based model for quantifying bioturbation.
  • To investigate the impact of burrowing behavior on vertical tracer distribution.
  • To compare model predictions with experimental data.

Main Methods:

  • A stochastic, memoryless model for organism burrowing behavior was developed.
  • Exponential distributions were used for inter-burrow waiting times and depths.
  • The model simulated vertical concentration profiles of a conservative tracer.

Main Results:

  • The model successfully predicted vertical concentration distributions.
  • Model outputs showed good quantitative agreement with experimental data.
  • The study validated the model's ability to represent bioturbation effects.

Conclusions:

  • The proposed process-based model effectively quantifies bioturbation.
  • The model provides a valuable tool for studying mixing processes in sediments.
  • Findings support the ecological significance of bioturbation in sediment dynamics.