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Community ecologists have become increasingly interested in analyzing the phylogenetic diversity of species assemblages. Species that co-occur in the same habitats often share a common phylogenetic history such that at coarse spatial scales a species assemblage with a locally clustered phylogenetic structure is usually associated with the presence of habitat filtering mechanisms. However, more recently it has been hypothesized that environmental filters act primarily on the relative abundance of species rather than on their simple presences and absences, reducing the species’ probabilities to persist in given environmental conditions. This process may produce a non-random distribution of species abundances in the regional phylogeny even in the absence of a locally clustered phylogenetic structure. In this paper, using data from the urban flora of Brussels (Belgium) we tested for the presence of non-randomness in the distribution of abundances among the species phylogenetic structure. We argue that the observed pattern of low species phylogenetic distinctiveness at increasing species abundances is compatible with environmental filtering processes.
During the study of the urban flora of Veszprém (central Hungary), a remarkable population of E. serpens, a new alien species for Hungary was found. Morphological characteristics of E. serpens besides the description of locality, coenological features and circumstances of introduction of the species are presented. Authors interpret the long-distance dispersal of the species in correlation to human activity (trade and transportation) and do not overrate the role of climatic change.
During the study of the urban flora of the city of Szeged (southern Hungary) in 2011, about 100 specimens of Euphorbia prostrata Aiton, a new alien for the Hungarian flora, were found in a city park. Characterisation of the locality is provided. This record, being the one and only in the Carpathian Basin so far, confirms former observations that this meridional-subtropical species is in expansion in many parts of the world, including proper habitats of the temperate regions. A key for all species of the genus Euphorbia subgenus Chamaesyce for the region is given.
-value spectra of spontaneous urban floras. In: R. Bornkamm, J.A. Lee and M.R.D. Seaward (eds.), Urban Ecology; The Second European Ecological Symposium . Blackwell Scientific Publications, Oxford. pp. 23–31. Durwen KJ
. On the role of alien species in urban flora and vegetation. In: J.M. Marzluff, E. Shulenberger, W. Endlicher, M. Alberti, G. Bradley, C. Ryan, C. ZumBrunnen and U. Simon (eds.), Urban Ecology: An International Perspective on the Interaction Between
