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Urban Ecosystems

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12-09-2022

Floristic changes of vascular flora in the city of Rome through grid-cell census over 23 years

Authors: Carlo Fratarcangeli, Giuliano Fanelli, Riccardo Testolin, Francesca Buffi, Alessandro Travaglini

Published in: Urban Ecosystems | Issue 6/2022

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Abstract

Cities are considered important areas for biodiversity and host a high plant species richness. However, many factors, such as urbanisation or changes in land use, can affect the presence of spontaneous flora and, consequently, represent a threat for biodiversity. How species respond to these factors of change in cities over time is a relevant and current issue and spatiotemporal analyses represent an essential step forward to better understand these dynamic systems and to fill gaps of knowledge. In this paper we present a comparison between a floristic survey carried out in 1995 on a grid-cell for the city of Rome and a new survey, performed between 2015 and 2018, in order to verify if the species composition significantly changed over time and to which drivers this change was related to. For 76 grid-cells of the raster, each of which of 1.6 km², we recorded all spontaneous vascular species. We analysed the differences between the two surveys by means of statistical tests on species richness, by species turnover, by generalised linear models (GLMs) and by Ellenberg indicator values. The patterns of species richness are similar between the two surveys, although an increase in the number of species per grid-cell, on average, was observed. This increase regarded both native and alien richness, with significant differences only for aliens. Many species significantly reduced or increased their frequencies, comparing the two surveys. A set of environmental variables, among which the presence of protected areas, are relevant for explaining the pattern of species’ frequencies and its change over time.

Our results suggest that the flora of the city, notwithstanding the steady human pressure and the increase in alien species, maintained a high level of heterogeneity.

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Title: Floristic changes of vascular flora in the city of Rome through grid-cell census over 23 years
Authors: Carlo Fratarcangeli
Giuliano Fanelli
Riccardo Testolin
Francesca Buffi
Alessandro Travaglini
Publication date: 12-09-2022
Publisher: Springer US
Published in: Urban Ecosystems / Issue 6/2022
Print ISSN: 1083-8155
Electronic ISSN: 1573-1642
DOI: https://doi.org/10.1007/s11252-022-01293-w

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