Plant diversity estimates of Mediterranean islands differ among biodiversity databases

作者：Francesco Santi, Julian Schrader, Riccardo Testolin, Michele Di Musciano, Olivier Argagnon, Fabio Attorre, Irena Axmanová, Federico Veggia Bombardi, Gianmaria Bonari, Vanessa Bruzzaniti, Juan Guillermo Campos, Johannes Foufopoulos, Emmanuel Garbolino, Riccardo Guarino, Behlül Güler, Borja Jiménez-Alfaro, Lea Klepka, Holger Kreft, Michele Lussu, Corrado Marcenò, Frédéric Médail, Maria Panitsa, Salvatore Pasta, Sofia Prandelli, Diletta Santovito, Željko Škvorc, Enrico Tordoni, Kiril Vassilev, Marlene Volz, Piero Zannini, Alessandro Chiarucci · 发表于：Ecography · 年份：2026 · DOI：10.1002/ecog.08128 · 被引用次数：1 · 研究领域：Ecology and Vegetation Dynamics Studies、Species Distribution and Climate Change、Mediterranean and Iberian flora and fauna

Large‐scale biodiversity databases encompass three main types of data for plants, namely single species point occurrences, co‐occurrences in vegetation plots, and checklists for specific areas. Evidence shows that such data types exhibit specific biases, reporting different species assemblages at local scales. We used the Mediterranean Basin, a global biodiversity hotspot with more than 2200 islands larger than 0.01 km 2 , to compare island vascular plant diversity patterns emerging from occurrence data (Global Biodiversity Information Facility; GBIF), vegetation plots (European Vegetation Archive; EVA), and species checklists (Global Inventory of Flora and Traits; GIFT). We aggregated plant data at the island level and compared geographic coverage, inventory completeness, and taxonomic coverage among these data sources. The combined databases accounted for 8702 species distributed on 790 islands (35.6% of the target islands). Data availability increased from small (26.8%) over medium (75.7%) to large islands (100.0%). Spatial coverage of databases on a 30 × 30 km grid was high for GBIF (52.8%) and EVA (45.4%), and low for GIFT (21.7%). GIFT provided higher native and alien species richness values for most of the islands, whereas GBIF and EVA consistently missed a considerable fraction of the expected species richness. Taking GIFT as reference, GBIF, and to a lesser extent EVA, showed a positive bias towards perennial species and an underrepresentation of annuals. Despite the...