The vegetative reproduction of Dicranum viride (Sull. & Lesq.) Lindb. as a likely explanation for micro-habitat and stand-type relationships – implications for forest management

Abstract

Dicranum viride is a bark-dwelling and woodland species listed in Annex II of the ‘EU Habitat Directive’. It occurs mainly in heavily managed forests. The effects of stand age, tree diameter and host tree species on the occurrence of D. viride have been studied at two distinct scales. We suggest that the effects of tree diameter and tree species are mainly related to bark roughness. The occurrence of D. viride on trees with a smooth bark is strongly related to the abundance of Hypnum cupressiforme var. filiforme, which may facilitate establishment of large leaf fragments on smooth bark. Vegetative dispersal and establishment of D. viride are inferred from the current occurrence pattern and biological traits of the species and are hypothesized as having been critical for its survival within managed forests. A straightforward and widely applicable new method of compartment prioritization is provided to facilitate the implementation of modified interventions.