A biogeographical regionalisation of Australian Acacia species

Aim: To develop a biogeographical regionalization of Australian Acacia species and to investigate their environmental correlates. Location: Australia. Methods: We used a previously published framework for delineating biogeographical regions. We calculated species turnover patterns of 1020 Australian Acacia species with distributions estimated from 171,758 georeferenced herbarium records aggregated to 100 km × 100 km cells (868 across Australia). An agglomerative cluster analysis using a matrix of pairwise Simpson's beta (βsim) dissimilarity values was applied. Eleven environmental variables at the same resolution as the aggregated herbarium records were used to explore the correlates of the βsim patterns using a non-metric multidimensional scaling (NMDS) analysis. We also used an ANOVA to test the significance of the environmental changes between each pair of biogeographical regions. Results: Five major Acacia biogeographical regions were proposed. These bioregions were broadly similar ...研究目标：构建澳大利亚金合欢属物种的生物地理分区体系，并探究其环境关联因子。研究区域：澳大利亚。研究方法：本研究采用已发表的生物地理区划框架。基于被聚合为100 km×100 km栅格单元（全澳范围内共868个）的171758条地理参考化标本馆记录所估算的分布范围，对1020个澳大利亚金合欢属物种的物种周转格局进行计算。本研究采用基于两两辛普森β（βsim）相异值矩阵的凝聚聚类分析；同时使用与标本馆记录聚合分辨率一致的11项环境变量，通过非度量多维标度分析（non-metric multidimensional scaling, NMDS）探究βsim格局的关联因子；此外还借助方差分析（Analysis of Variance, ANOVA）检验每一对生物地理分区间的环境变化显著性。研究结果：本研究提出了5个主要的金合欢属生物地理分区，这些生物区系大体相似……