Work

Metabolomic indicators anticipate permafrost peatland ecosystem transition before visible change

Year: 2026

Type: article

Abstract: Climate change is accelerating ecosystem transitions worldwide, yet these changes often go undetected until visible damage occurs. Reliable early warning indicators are therefore needed. Here, we present a chemical indicator framework developed from a decade of permafrost thaw monitoring in subarctic Sweden. We show that declining soil chemical heterogeneity, measured as metabolomic mosaic diversity, preceded the documented collapse of palsa, a permafrost peat mound, at nearby sites by an estimated 2 to 7 years. This decline reflected a simpler metabolomic landscape, in which chemical variation followed fewer dominant biogeochemical gradients. Logistic regression of metabolomic fingerprints further revealed habitat specific chemical signatures. Deep soils kept a palsa signature after surface thaw, which shows that thaw proceeds in layers and in a nonlinear way. Finally, we identified metabolites with ecological functions. Catechin, a natural inhibitor of methane production, declined over time and may link ecosystem change to methane feedbacks. Together, these results show how untargeted metabolomics can be translated into measurable indicators of ecosystem change. Although developed for permafrost systems, this approach addresses a broader need to turn complex biochemical data into practical indicators, explain how ecosystems change, and identify sites that need closer monitoring before visible change occurs.

Source: Ecological Indicators

DOI: 10.1016/j.ecolind.2026.115709