Spatial Patterns of Endemic Plants in California
Spatial Patterns of Endemic Plants in California
复制标题
加州特有植物的空间格局
DOI：
10.3375/043.029.0402
复制
发表时间：
2009
影响因子：
10
通讯作者：
David M. Stoms
中科院分区：
文献类型：
--
作者：
James H. Thorne;J. Viers;J. Price;David M. Stoms
摘要：
加州特有维管植物分布区模式是使用基于植物区系的地理数据库技术来量化的，该技术通过地理区域和海拔带来定义物种范围。由此产生的物种空间格局报告了228个地理单元。超过60%的特有种分布区大小小于10000 km2。最大的特有类群范围为275,749平方公里，占全州的67%。加州特有植物丰富度分布模式由228个地理单元总结，并根据不同的标准进行报告。加利福尼亚州的中央海岸山脉、内华达山脉山麓、高海拔内华达山脉、海峡群岛、圣哈辛托山脉、纳帕县和莱克县、因约山、莫哈韦沙漠的部分地区和圣贝纳迪诺山脉都被确定为具有独特的特有植物属性的地区。我们比较了具有相似地形和气候的区域地图单元之间的特有物种丰富度，发现该地区仅与物种丰富度弱相关，这表明其他因素对加州大陆的特有物种丰富度有更强的影响。这些发现对制定针对特有物种的保护计划具有重要意义。特别是，我们根据受限制的特有植物的特点，确定了以前不太重视的该州地区，这些地区值得更多地认识。这一分析低估了俄勒冈州和下加利福尼亚州边界附近的地方病水平，因为数据库人为地限制了加利福尼亚州的边界。然而，在这项研究中，通过数字再现植物检索表产生的范围分布估计被证明是有效的，这是一种廉价的方法，可以在世界上已经出版植物区系的其他地区实施。
ABSTRACT:
California endemic vascular plant range patterns were quantified using a flora-based geodatabase technique that defined species range by geographic area and elevation band. Resulting species spatial patterns are reported for 228 geographic units. Over 60% of the endemic species range size distributions were found to have range sizes less than 10,000 km2. The largest endemic taxon range was 275,749 km2, or 67% of the state. California endemic plant richness distribution patterns are summarized by 228 geographic units, and reported by various criteria. California's Central Coast Ranges, Sierra Nevada foothills, high elevation Sierra Nevada Mountains, Channel Islands, San Jacinto Mountains, Napa and Lake Counties, Inyo Mountains, sections of the Mojave Desert, and San Bernardino Mountains were all identified as areas with unique endemic plant attributes. We compared endemic species richness between map units in zones containing similar topography and climate, and found that area only weakly correlated with species richness, suggesting other factors have stronger influence on endemism in continental California. The findings have implications for developing conservation plans that target endemic species. In particular, we identify areas of the state, previously de-emphasized, that deserve greater recognition based on the characteristics of their restricted endemic plants. This analysis underestimates the level of endemism near the borders with Oregon and Baja California because of the artificial limitation of the database to the boundaries of the state of California. However, range distribution estimates produced from digital renditions of floral keys proved effective in this study, an inexpensive approach that could be implemented in other regions of the world for which floras have been published.