云南被子植物菊类分支的系统发育多样性及其分布格局

Phylogenetic diversity and its distribution pattern of asterids in Yunnan angiosperms flora

全球气候变化与人为活动等因素导致的生物多样性丧失,引起了全球各界对生物多样性保护的高度关注。传统生物多样性保护主要对物种、特有种、受威胁物种的种类组成及其分布模式开展研究,忽视了进化历史在生物多样性保护中的作用。云南是全球生物多样性热点地区的交汇区,生物多样性的保护历来受到广泛关注,为了更好地探讨云南生物多样性的保护措施,该研究以云南被子植物菊类分支物种为研究对象,基于物种间的演化关系,结合其地理分布,从进化历史的角度探讨物种、特有种、受威胁物种的种类组成及系统发育组成的分布格局,并整合自然保护地的空间分布,识别生物多样性的重点保护区域。结果表明:云南被子植物菊类分支的物种、特有种及受威胁物种的物种密度与系统发育多样性均显著正相关;通过零模型分析发现,由南向北标准化系统发育多样性逐渐降低;云南南部、东南部、西北部是云南被子植物菊类分支的重点保护区域,加强这些区域的保护,将最大化地保护生物多样性的进化历史和进化潜能。由此可见,融合进化历史信息的植物多样性格局分析不仅有助于更加深入地理解植物多样性的形成与演变,也为生物多样性保护策略的制定提供更多的思路。

Biodiversity conservation has attracted much attention around the world due to species extinction risks resulting from global climate change,human activities and so on.Traditional attempts to biodiversity conservation typically focus on the analyses of taxonomic composition and its distribution pattern of species,endemic species and threatened species,and ignore the rich context that evolutionary history can provide.As the intersection area of global biodiversity hotspots,the biodiversity conservation in Yunnan has been widely concerned.To better protect biodiversity in Yunnan,we combine data on the distributions and phylogenetic relationships of species from asterides in Yunnan angiosperms flora,explore how taxonomic composition(including species,endemic species and threatened species)and phylogenetic diversity vary across the different geographic regions in this area.And then integrating the distribution of nature protected areas with data of taxonomic and phylogenetic composition,we identify the key areas for biodiversity conservation.The results were as follows:Phylogenetic diversity was well correlated with taxonomic richness for species,endemic species and threatened species among the geographic regions;Using null model analyses,we found the standardized effect size of the phylogenetic diversity decreased gradually in Yunnan from south to north;We suggest that the southern,southeastern and northwestern Yunnan should be the biodiversity priority areas since they may help maximize the protection of evolutionary history and potential for Yunnan angiosperm flora.It can been seen that the integration of phylogenetic information can help us to better understand the formation and development of plant diversity,and provide more clues for the formulation of biodiversity protection strategies.