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A note on the stable carbon isotope composition of bryophytes in calcareous aquatic habits and its relationship to carbon dioxide assimilation

Abstract The stable carbon isotope composition of six bryophytes (five from a hardwater spring, one from heathland) varied with the carbon dioxide source. Palustriella commutata growing in calcareous springwater was most depleted in 13C and Polytrichum formosum, the heathland species was the least depleted. The pattern of depletion was consistent with the observed availability of 13C-depleted groundwater. The springwater bryophytes were also associated with travertine deposition and demonstrated the probable existence of a photosynthetically-driven travertine component.