RT info:eu-repo/semantics/article T1 An island view of endemic rarity—Environmental drivers and consequences for nature conservation A1 Irl, Severin D.H. A1 Schweiger, Andreas H. A1 Medina, Félix M. A1 Fernández-Palacios, José María A1 Harter, David E. V. A1 Jentsch, Anke A1 Provenzale, Antonello A1 Steinbauer, Manuel J. A1 Beierkuhnlein, Carl K1 corrected weighted endemism K1 conservation biogeography K1 endemic plant species K1 evolutionary pattern K1 hypervolume K1 island ecology K1 Natura 2000 K1 protected areas K1 biogeografía de la conservación K1 especies de plantas endémicas K1 patrones evolutivos K1 hipervolumen K1 ecología insular K1 áreas protegidas AB Aim: Rarity—an important measure for conservation biogeography—can vary overmany orders of magnitude. However, it is unclear which regional-scaleabiotic conditionsdrive processes affecting rarity of endemic species on islands. To support conservationefforts, we (1) assess the main abiotic drivers of endemic rarity, (2) determinehow well existing protected areas (PAs) coincide with hotspots of endemic rarity and(3) introduce and evaluate a new hypervolume-basedrarity estimator.Location: La Palma (Canary Islands).Methods: We recorded all present endemic vascular plant species in 1,212 plots coveringthe entire island. We calculated endemic rarity (corrected range-rarityrichnessfor endemics) using a rarity estimation approach based on kernel density estimations(hypervolume approach). We performed a sensitivity analysis based on multiple linearregressions and relative importance estimations of environmental drivers to estimatethe performance of the hypervolume-basedrarity estimation compared to standardmethods (occurrence frequency, convex hulls, alpha hulls).Results: Climate variables (mean annual temperature, climatic rarity, precipitation variability)best explained archipelago endemic (AE) and single-islandendemic (SIE) rarity.Existing PAs covered the majority of AE and SIE rarity, especially national and naturalparks as well as the Natura 2000 sites. In our study system, hypervolumes performedbetter than standard measures of range size.Main conclusion: Both AE and SIE rarity on La Palma show a clear spatial pattern, withhotspots of endemic rarity found at high elevations and in rare climates, presumablyowing to geographical and climatic constraints and possibly anthropogenic pressure(e.g., land use, introduced herbivores, fire). Areas of high rarity estimates coincide withthe distribution and extent of PAs on La Palma, especially since the recent addition ofthe Natura 2000 sites. The hypervolume approach is a promising tool to estimate speciesrange sizes, and can be applied on all scales where point/plot data are available. PB Wiley YR 2017 FD 2017 LK http://riull.ull.es/xmlui/handle/915/18456 UL http://riull.ull.es/xmlui/handle/915/18456 LA en NO European Union DS Repositorio institucional de la Universidad de La Laguna RD 10-oct-2024