Effects of climate change on the distribution of plant species and plant functional strategies on the Canary Islands

Occurrence data: We used occurrence data from the Banco de Datos de Biodiversidad de Canarias, an open-access database, for single-island endemic (SIE; n = 325), archipelago endemic (AE; n = 234) and definitely non-endemic native (NEN; n = 149) extant seed plant species (excluding subspecies), in a raster of 500 m x 500 m grid cells covering the Canary Islands (https://www.biodiversidadcanarias.es/biota/) [<em>accessed 14/03/2022</em>]. The database includes all species listed in the checklist of the Banco de Datos de Biodiversidad de Canarias, across 31,628 grid cell assemblages. Species range in occurrence from 1 to 4,466 cells. We only retrieved occurrences for which a species has been certainly observed or collected (precision level 1 of four levels). The Banco de Datos de Biodiversidad de Canarias provides presence-only information that is spatially biased by sampling effort (Hortal et al., 2007). However, the sampling bias of SIEs, AEs, and NENs is less than for species overall because studies incorporated into the database involved focus on, and extensive sampling of, endemic and non-endemic native species (https://www.biodiversidadcanarias.es/biota/documentos). We considered a species (pseudo-)absent if it was not recorded at a site, although we recognise that there is debate as to whether this truly represents absences.出现数据：本研究使用开源数据库加那利群岛生物多样性数据库（Banco de Datos de Biodiversidad de Canarias）的物种出现数据，研究对象涵盖单岛特有种（single-island endemic，SIE；n=325）、群岛特有种（archipelago endemic，AE；n=234）以及确定非特有本土种（definitely non-endemic native，NEN；n=149）的现存种子植物物种（不包含亚种），研究空间为覆盖加那利群岛的500m×500m栅格单元，相关数据获取链接为https://www.biodiversidadcanarias.es/biota/，检索时间为2022年3月14日。该数据库收录了其官方名录中列出的全部物种，涵盖31628个栅格单元组合。各物种的出现栅格数范围为1至4466个。本研究仅筛选经明确观测或采集的物种出现记录（四级精度分级中的第1级）。加那利群岛生物多样性数据库仅提供仅存在点记录信息，其空间分布会因采样投入存在偏差（Hortal et al., 2007）。不过，单岛特有种、群岛特有种与确定非特有本土种的采样偏差程度低于整体物种平均水平，原因在于该数据库纳入的相关研究均聚焦于特有及非特有本土物种并开展了大规模采样（数据来源链接：https://www.biodiversidadcanarias.es/biota/documentos）。本研究将未在某一栅格位点被记录的物种视为（伪）缺失，但需说明，此类记录是否真正代表物种真实缺失仍存在学术争议。