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Earthworm activity and its coupling to soil hydrology: A deterministic analysis.

S Mangiarotti¹, E Fu¹, P Jouquet²

¹Centre d'Études Spatiales de la Biosphère, UPS-CNRS-CNES-IRD-INRAe, Observatoire Midi-Pyrénées, 18 avenue Édouard Belin, 31401 Toulouse, France.

Chaos (Woodbury, N.Y.)

|March 23, 2021

Summary

Anecic earthworm activity, modeled using chaos theory, is chaotically coupled to soil water content. Earthworm retroaction on soil is necessary to explain observed desynchronized cast production across sites.

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Area of Science:

Ecology
Zoology
Soil Science

Background:

Anecic earthworm activity, specifically cast production, influences soil structure and nutrient cycling.
Understanding earthworm behavior is crucial for soil ecosystem dynamics.
Previous studies often modeled earthworm activity linearly, neglecting complex dynamics.

Purpose of the Study:

To investigate the chaotic dynamics of anecic earthworm activity using in situ observations.
To model earthworm cast production and its relationship with soil water content.
To identify factors contributing to spatiotemporal variations in earthworm activity.

Main Methods:

Utilized in situ observations of earthworm cast production from September 2016 to January 2018.
Applied chaos theory and global modeling techniques to derive deterministic ordinary differential equations from time series data.
Analyzed the coupling between earthworm behavior and soil water content dynamics.

Main Results:

Earthworm behavior, characterized by cast production, exhibits chaotic dynamics.
Earthworm activity is complexly and integratively coupled to soil water content, suggesting habituation/sensitization processes.
The direct coupling to soil water content alone could not explain desynchronized cast production across different sites.

Conclusions:

Earthworm cast production is a chaotic process influenced by soil water content.
Earthworm activity's retroaction on the soil environment is essential to explain spatiotemporal discrepancies in cast production.
Complex interactions, including earthworm-soil feedback, drive ecosystem dynamics.