Habitat type and island identity as drivers of community assembly in an archipelago

Riccardo Guarino, Fabrizio Buldrini, Alessandro Chiarucci, Lorenzo Lazzaro, Laura Casella, Pierangela Angelini, Marco Cervellini, Piero Zannini, Salvatore Pasta, Mirko Enea, Marco Caccianiga, Bruno Enrico Leone Cerabolini, Daniele Viciani, Bruno Foggi

Risultato della ricerca: Articlepeer review

Abstract

Aim: Ecoinformatics offer new opportunity to test islands as biogeographic and eco- logical models. In this paper we predicted three hypotheses: (1) plot-based data issu- ing from vegetation surveys can be used to predict Island Species-Area Relationships (ISARs) or island similarity; (2) the habitat area is an independent predictor of species richness patterns within island; (3) species richness and composition are more de- pendent on habitat type than island identity in land-bridge islands.Area: Tuscan Archipelago, Italy.Methods: We assembled a database of all the vegetation plots available for the archi- pelago. For the first hypothesis we calculated ISARs, using Arrhenius model, and Beta Diversity, using Jaccard dissimilarity, on both published floras and cumulative plot data. For the second hypothesis, we modelled Habitat Species-Area Relationships (HSARs), using Arrhenius model. For the third hypothesis, we used additive partition- ing of species richness, NMDS and PERMANOVA.Results: Island Species-Area Relationships based on plot data mirrored those on pub- lished floras, but absolute values of c and z parameters were different. Beta diversity based on plot data resembled those of published floras, but was higher. Species rich- ness was significantly related to the habitat area. The total species richness of the archipelago was linked to large scale drivers, such as island identity, while plot species composition was driven by both habitat type and island identity.Conclusions: Data assembled issuing from vegetation surveys are useful to describe biogeographic patterns. Species richness in the archipelago is driven by spatial fac- tors such as the amount of habitats and the differences among islands, while the spe- cies composition of local assemblages is largely driven by habitat filters rather than by island identity, as expected in land-bridge islands.
Lingua originaleEnglish
pagine (da-a)1-14
Numero di pagine14
RivistaJournal of Vegetation Science
Stato di pubblicazionePublished - 2020

All Science Journal Classification (ASJC) codes

  • Ecology
  • Plant Science

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