Xu et al. (2023) — FLAGGED: OUT OF SCOPE

Full title: Non-equilibrium early-warning signals for critical transitions in ecological systems Authors: Li Xu, Denis Patterson, Simon Asher Levin, Jin Wang Journal: PNAS, Vol. 120, No. 5, e2218663120 Year: 2023 DOI: 10.1073/pnas.2218663120 Date flagged: 2026-06-23 Status: OUT OF SCOPE — not relevant to this knowledge base

Why It Was Flagged

This is a mathematical ecology / nonequilibrium statistical mechanics paper. It applies landscape-flux theory to predict critical transitions (regime shifts) in ecological systems, using a shallow lake model as an exemplar. The paper proposes that average flux, entropy production, nonequilibrium free energy, and time irreversibility can serve as early warning signals for ecosystem tipping points.

While the concept of "critical transitions" and "tipping points" could superficially resemble the concept of leaving the Window of Tolerance (a shift between regulatory states), the paper is entirely about ecological systems (lake eutrophication, savanna-forest transitions) using nonequilibrium thermodynamics. It does not address the autonomic nervous system, polyvagal theory, interoception, HRV, or any neuroscience topic covered by this wiki.

Not related to: autonomic nervous system, polyvagal theory, interoception, vagal tone, Window of Tolerance, or any topic in this knowledge base.

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