Centre d'Études Spatiales de la Biosphère, UPS-CNRS-CNES-IRD-INRAe, Observatoire Midi-Pyrénées, 18 avenue Édouard Belin, 31401 Toulouse, France.
Institute of Ecology and Environmental Sciences (UMR 242 iEES-Paris), Sorbonne Université, 75252 Paris, France.
Chaos. 2021 Jan;31(1):013134. doi: 10.1063/5.0029969.
Considering in situ observations, chaos theory was taken as a basis to study the activity of anecic earthworms based on cast production from September 2016 to January 2018 in the Dong Cao watershed (Vietnam). To study this activity, the global modeling technique was used to obtain deterministic models of ordinary differential equations directly from observational time series. The obtained models show that the behavior of earthworms is chaotic; it is coupled to the dynamics of soil water content in a complex (integrative) way and can be interpreted as an habituation/sensitization process. However, this coupling is insufficient to explain the desynchronization of the cast production variations observed at different study sites. The retroaction of earthworm activity on soil is required to explain the spatiotemporal discrepancies.
考虑到现场观测，混沌理论被用来研究 2016 年 9 月至 2018 年 1 月在越南东曹流域（Dong Cao watershed）基于粪便产生的穴居蚯蚓的活动。为了研究这种活动，使用全局建模技术从观测时间序列直接获得常微分方程的确定性模型。得到的模型表明，蚯蚓的行为是混沌的；它与土壤含水量的动态以复杂（综合）的方式耦合，可以解释为习惯/敏感化过程。然而，这种耦合不足以解释在不同研究地点观察到的粪便产生变化的不同步。需要蚯蚓活动对土壤的反作用来解释时空差异。
