Areas of endemism of selected seed plants in southcentral/southwestern USA

Areas of endemism (AEs) are fundamental entities of analysis in biogeography and a key step for biogeographical regionalization. Even though many studies have contributed to the biogeographical knowledge of southern USA flora, no endemicity analysis (EA) has been conducted that would include a large number of native seed plant species from different families. A new analysis of plant spatial patterns is important as a first step for a future updated floristic regionalization of North America North of Mexico. It has become easier to accomplish owing to the increased availability of large-scale digitized distributional data and statistical methods of biogeographic analysis. Here we identify the AEs in SC/SW USA using digitized plant specimen data available from IDigBio. We built a database with 81,851-specimen point records of 400 selected mostly angiosperm species and applied the NDM/VNDM method of endemicity analysis. We then compare the established 26 AEs in the area of study with the f...

特有分布区（Areas of endemism, AEs）是生物地理学研究的核心分析单元，同时也是生物地理分区的关键步骤。尽管已有诸多研究为美国南部植物区系的生物地理学认知提供了支撑，但目前尚无一项涵盖不同科属大量本土种子植物物种的特有性分析（endemicity analysis, EA）工作。针对植物空间格局开展新的分析，作为未来更新墨西哥以北北美植物区系分区的第一步，具有重要意义。得益于大规模数字化分布数据与生物地理学统计分析方法的日益普及，此类研究的开展已更为便捷。本研究依托IDigBio平台公开的数字化植物标本数据，对美国南/西南部（SC/SW USA）的特有分布区进行识别。我们构建了包含400个优选物种（以被子植物为主）的81851条标本点位记录数据库，并应用NDM/VNDM特有性分析方法开展研究。随后，我们将本次研究划定的26个特有分布区与……