CC-Bio

摘要: Natalie James , Sylvie de Blois , Marcel Darveau Page 1 Pseudo-absences were selected using three different methods. For each species the number of pseudo-absences sampled was equal to the number of recorded presence points. Ten repetitions were made for each method of pseudo-absence selection. Species distribution models are increasingly employed to forecast the spatial distribution of the environmental components of species’ ranges under novel spatial or temporal contexts (ie scenarios of future climatic change). The models are frequently based upon multiple presence-only datasets of species occurrence. In order to make use of powerful statistical methods, the generation of pseudo-absences has been widely adopted (Engler et al. 2004; Chefaoui & Lobo 2008; Wisz & Guisan 2009). While several strategies for selecting pseudo-absences have been proposed; researchers have yet to reach a …