In total, 3,310 fern communities established on hardscapes (hard landscape elements such as walls, stone walls, open areas between buildings, or roadside openings) in 60 urban areas in Chubu region, Honshu, Japan, were investigated to analyze the habitat preferences of each fern species and examine the impact of urbanization on the distribution of each species. The analysis was conducted using a strategy similar to that employed in a previous study conducted in Kinki and Chugoku regions. Results showed that the impact to presence/absence of each species by urbanization was confirmed in 19 species (52.7%). Almost all species that preferred open areas between buildings were forest species, those that preferred walls were epiphytic species, whereas stone wall habitats were preferred by various species, in particular those which were originally adapted to inhabiting cliffs and rocks. Stone walls could be important as urban secondary habitats for rock or cliff ferns, including epiphytic species. These sites may serve as habitats for rare/endangered species. The fern species that particularly preferred the stone wall habitat could be useful as urban revegetation material, such as for wall greenings. Although each type of hardscape has its own utilization value, stone walls, which provide urban habitats for many fern species, need to be repaired and renewed in appropriate ways from the viewpoint of urban biodiversity conservation.
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