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Abîme de Comblain, Belgium
The Abîme de Comblain, located in the karst region of Comblain-au-Pont, is a remarkable vertical cave system that holds significant scientific value. Characterized by deep shafts, narrow passages, and a complex underground network, the site offers a unique opportunity to study subterranean environments shaped by vertical karst processes (Ek and Godissart, 2007, https://www.grottedecomblain.be/).
From a geological perspective, the Abîme de Comblain provides insight into speleogenesis driven by fracture-controlled water circulation. Its morphology reflects long-term interactions between lithology, structural weaknesses, and hydrological dynamics. These features make it particularly relevant for understanding vertical cave development and subsurface drainage patterns in carbonate terrains (Ek and Godissart, 2007). Something really interesting, is the very high amount in CO2, making the fauna living in this cave even more incredible (Ek and Godissart, 2019).
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Biologically, the cave hosts specialized subterranean fauna adapted to stable but extreme conditions, including darkness, limited food availability, and high humidity. Such environments are ideal for investigating ecological constraints, physiological adaptations, and evolutionary trajectories of cave-dwelling organisms. Microbial communities developing on cave walls and sediments are also of interest, as they may play a role in mineral precipitation and organic matter recycling. It is specially known to shelter on of the Microniphargus species found in Europe (Weber et al., 2020, Hubart and Dethier, 1999).
Words by Claire Chauveau
Photos by Gaëtan Rochez (GRSP)
Ek, C., & Godissart, J. (2007). La Grotte et l'Abîme de Comblain-au-Pont.
Ek, C., & Godissart, J. (2019). L’air des grottes de Belgique s’ enrichit en CO2 au fil des années. Science et Culture, 477.
Hubart, J. M., & Dethier, M. (1999). La faune troglobie de Belgique: état actuel des connaissances et perspectives. Bulletin de la Société royale belge d’Entomologie, 135, 164-178.
Weber, D., Stoch, F., Knight, L. R., Chauveau, C., & Flot, J. F. (2020). The genus Microniphargus (Crustacea, Amphipoda): evidence for three lineages distributed across northwestern Europe and transfer to Pseudoniphargidae. bioRxiv, 2020-08.