[Vascular spontaneous flora of the town of Modena: analysis of the historic centre]
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Accepted: 19 June 2020
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[The results of the first systematic study concerning the urban flora of Modena are here presented. Data collection was carried out in 2014-2018, by inspecting every road and square of the historic centre, intended as the area encompassed within the wide avenues that retrace the layout of the 16th century ramparts. 344 plant species were found, of which 1 is new for the flora of Italy, 10 are new for Emilia-Romagna and 19 are new for the province of Modena. Among these 30 new species, alien species make up 63%. There are 17 species no longer found during this study, which were observed at least 20 years ago or were testified only by late 19th century herbarium samples. The life form spectrum is dominated by the therophytes (44%), followed by hemicryptophytes (28%) and phanerophytes (15%). Eurasian (28%), Mediterranean (24%) and cosmopolite species (24%) dominate the chorological spectrum. Neophytes are 18% of the total number of species, quite a low percentage if compared with what was observed in other towns of the Po Plain and Central Europe. This fact is probably due to the small area of the historic city centre, whose compact urbanistic structure seems to resist against the diffusion of alien plants. The invasive species are 11% of the total. The presence of 15 hygrophilous species is interesting, since they indicate irrigation or hyper-irrigation of lawns and flowerbeds. We found 4 protected species at the regional level, of which 2 are escaped from cultivation. Concerning the affinity of the species to urban ecology, the floristic list is dominated by the urban-neutral (45%) and urbanophilous species (42%). This fact can indicate a good variety in terms of growth environments, with most of them probably in a quite advanced phase of ecological evolution for an urban centre, and also a fairly good environmental quality, likely due – at least partially – to the abundance of green areas. The species richness in every road or square is strongly correlated to the environmental heterogeneity (ρ = 0,794) and moderately correlated to the nearby presence of green areas (ρ = 0,544) and to the road length or square surface (ρ = 0,665 and 0,673, respectively). Furthermore, a weak correlation (ρ = 0,212) exists between the presence of horticultural or food species and the presence of restaurants in the same road or square. Therefore, the town is confirmed to be a very dynamic ecosystem with great biological richness, useful to understand the ecological strategies developed by plants to adapt to sometimes very unfavourable conditions. In addition, during the process of colonisation of a region, urban areas often act as a «hub» for the spreading of species along the road and railway network. Understanding and respecting the ecological roles of native species is thus fundamental for modern urban planning, aimed at improving the quality of life as a whole.]
[Article in Italian]
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