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Karkkila, Finland

Ricotta C.,University of Rome La Sapienza | Godefroid S.,National Botanic Garden of Belgium | Godefroid S.,Vrije Universiteit Brussel | Godefroid S.,Free University of Colombia | And 2 more authors.
Plant Biosystems | Year: 2015

As species functioning is not randomly distributed with respect to phylogeny, we should expect that species assemblages, which are subject to the same environmental filters, often possess a clustered phylogenetic structure. This locally clustered phylogenetic structure is usually detected with randomization tests. In this paper we apply a test of community phylogenetic clustering that takes into account the non-random distribution of species frequency across the phylogeny of the urban flora of Brussels (Belgium). Our results provide only moderate support to the idea that a locally clustered phylogenetic structure is central to the coarse-scale patterns of species co-occurrence of this urban area. The abiotic drivers that promote a locally clustered phylogeny in cities like Brussels are also shortly discussed. © 2013,Società Botanica Italiana.


Heathfield D.,World in a Box | Kivisto V.,World in a Box | Mazzoleni S.,University of Naples Federico II | Ricotta C.,University of Rome La Sapienza
Annali di Botanica | Year: 2013

In this paper we introduce a program for testing for habitat filtering in local communities compared to a regional species pool. Based on phylogenetic or functional species data, the program first calculates the mean species dissimilarity in the local community. Next, it compares this value with a null distribution of expected values obtained drawing species randomly and without replacement from the regional species pool.


Ricotta C.,University of Rome La Sapienza | Heathfield D.,World in a Box | Godefroid S.,National Botanic Garden of Belgium | Godefroid S.,Vrije Universiteit Brussel | And 2 more authors.
Community Ecology | Year: 2012

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.

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