Abstract
This paper aims to analyse the spatial patterns of sampling effort and species richness of pteridophyte in a well-investigated region as Tuscany, Italy, by using data stored from a geodatabase storing information on the specimens preserved in the main herbaria of the region. A total of 6,905 records about pteridophyte specimens were extracted from the geodatabase, and 5,638 of such specimens were studied through the use of spatial statistical techniques. The data about the sampling effort and species richness were analysed in relation to topographical variables to assess any significant relationship. Specimen-based rarefaction techniques were used to compare areas with different number of detected species. The analysis of the sampling effort data showed a nonhomogeneous distribution of herbarium data, with some areas being intensively sampled and others being almost unsampled. Thus, the geographical distribution of specimens was extremely clustered. The comparison across geographical areas through specimen-based rarefaction curves showed great differences in species richness and sampling completeness. The analysis of the residuals of species–area relationships evidenced that the distance to water bodies was the only significant topographical variable in controlling species diversity.
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Acknowledgments
This study forms part of the GIFT project (Geographical Information on the Flora of Tuscany), funded by the Tuscany Region through the European POR-FSE fund. The authors thank all the people who supported and collaborated to this project by providing their plant collections or through the direct insert of the specimens into the database. In particular, many thanks go to Federico Selvi (Department of Agricultural Biotecnology Agrarie of University of Florence), Lorenzo Cecchi and Chiara Nepi (Natural History Museum of University of Florence), Lucia Amadei and Silvia Maccioni (Department of Biology of University of Pisa), Andrea Voirgar (Agricultural Technical College of Pescia), Elisa Santi and Sara Landi (Department of Environmental Science of University of Siena), Paolo Emilio Tomei and Serena Trimarchi (Department of Agronomy of University of Pisa), Pier Virgilio Arrigoni (University of Florence) and Fausto Bonafede. Many thanks also go to Roberto Venanzoni and Edoardo Panfili (University of Perugia) for the technical support and to Dino Marchetti for the huge amount of specimens provided and for the precious support for plants’ determination.
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Geri, F., Lastrucci, L., Viciani, D. et al. Mapping patterns of ferns species richness through the use of herbarium data. Biodivers Conserv 22, 1679–1690 (2013). https://doi.org/10.1007/s10531-013-0503-7
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DOI: https://doi.org/10.1007/s10531-013-0503-7