Vegetation Inventory of the Juan Fernández Islands A number of studies on vegetation of the Robinson Crusoe Archipelago have been completed over the past 120 years. A first summary of the general vegetation of the archipelago was provided by Johow (1896) in addition to his treatment of the flora of the archipelago. In the years 1908, 1916, and 1917, Swedish botanist Carl Skottsberg visited the islands and collected data for a profound analysis of the vegetation, which was, however, published nearly half a century later (Skottsberg 1953a). Besides the many informative and detailed descriptions of the vegetation, he also provided graphical summaries of the vegetation on both islands by very simple sketch maps. These maps were very helpful, but they were based on inaccurate topographical maps and had no support from comprehensive aerial photographs. Two further analyses focused on Robinson Crusoe Island: a detailed report of the vegetation on and around the summit of El Yunque by Kunkel (1957) and a transect analysis by Schwaar (1979). A revised map based on Skottsberg’s (1953a) map, including new observations from 1976 and 1979, was provided by Nishida and Nishida (1981). This map, however, is of limited resolution, displaying only six vegetation units. Another mapping effort of the vegetation of the entire archipelago was completed by Ortiz R. (1982), who used aerial photographs taken in 1980 by the Chilean Air Force. This analysis yielded more than 120 different categories of vegetation, many based on dominance of single species, and together providing an overly complex picture of the spatial distribution of the vegetation. In investigating bird communities, Hahn (1998) showed a rough distribution of habitat types on both islands based on Skottsberg’s maps and data, updated by detailed actual observations. Modified versions of Skottsberg’s maps are also included in a short summary in Mueller-Dombois and Fosberg (1998). Cuevas (2002) investigated the proportions of native and alien plants on Alejandro Selkirk Island (AS) in some relevés taken from different habitats. Danton et al. (2006) gave short descriptions of the vegetation on the islands in their catalogue of vascular plants in the archipelago, whereas Danton (2006b) focused on the Myrceugenia (Nothomyrcia) forests on both islands.