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Past, present, and future of the invasion of Senecio pterophorus

AuthorsRubió-Ortega, Cristina; Herrando Moraira, Sonia ; Nualart, Neus ; Vilatersana, Roser ; López-Pujol, Jordi
Issue Date26-Jul-2017
CitationXIX International Botanical Congress (2017)
AbstractSenecio pterophorus DC. is a perennial shrub of the family Compositae native to eastern South Africa (Eastern Cape and KwaZulu-Natal provinces) that inhabits forest margins, grasslands, and fynbos. One hundred years ago, S. pterophorus expanded into Western Cape in South Africa and was introduced cross-continentally in Australia as well. A more recent expansion occurred 25¿30 years ago in Europe, concretely in Liguria (NW Italy) and Catalonia (NE Spain). In the introduced ranges, it mainly appears in disturbed areas such as railroads or roadsides, although it can also occur in natural areas. During the late 19th and the early 20th centuries, S. pterophorus was recorded in Belgium and the United Kingdom, respectively, although it is now considered extinct in both countries. We used ecological niche models [geographic (G) space] and niche comparisons analyses [both in geographic and environmental (E) spaces] aimed to: (1) determine whether the species has changed its niche during the invasion process, (2) ascertain why the species has not succeeded neither in Belgium nor in United Kingdom, and (3) assess possible expansions and/or contractions of the species under different climate change scenarios by comparing habitat suitability between present and future models. In the G-space we used the maximum entropy algorithm (implemented in MaxEnt) to create niche distribution models, which are projected and evaluated in the native area vs. the invaded ones, and vice versa. Possible differences in niches of native and invaded areas were also tested by comparing background divergence with the observed niche divergence in the Principal Components Analysis (PCA)-reduced axes. The results of this study would contribute to understand in which conditions S. pterophorus is behaving as an invasive plant.
DescriptionTrabajo presentado en el XIX International Botanical Congress (IBC 2017), celebrado en Shenzhen (China) del 23 al 29 de julio de 2017
Appears in Collections:(IBB) Comunicaciones congresos
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