Differing phylogeographic patterns within the Indo-West Pacific mangrove genus Xylocarpus (Meliaceae)
Differing phylogeographic patterns within the Indo-West Pacific mangrove genus Xylocarpus (Meliaceae)
复制标题
印度-西太平洋红树林木果属（楝科）内不同的系统发育地理学模式
DOI：
10.1111/jbi.13151
复制
发表时间：
2018-03-01
影响因子：
3.9
通讯作者：
Huang, Yelin
中科院分区：
文献类型：
--
作者：
Guo, Zixiao;Guo, Wuxia;Huang, Yelin
木果属（Xylocarpus）包括两种红树林，即木果木（X. granatum和X. moluccensis和一种稀有的非红树植物X. rumphii。这两种红树林具有独特的扩散能力，即通过漂浮繁殖体扩散，是研究海岸植物群落学的理想模式。构建了木果属及其近缘种的系统发育模型，并测定了两种红树林的种群结构。我们的目的是阐明大陆漂移和长距离扩散（LDD）的作用，在塑造今天的分布Xylocarpusand确定影响种群分化的格局的因素。granatum，X. moluccensis和X. rumphii在IWP地区进行了采样。木果属和外类群物种的5个叶绿体DNA基因间隔区进行测序，以确定分歧时间。利用5个核基因座和2个叶绿体基因座进一步分析了两种红树林的遗传多样性、遗传分化和遗传结构。结果木果属（Xylocarpus）与其姊妹属Carapa的分离时间约为19.4Ma。X. granatum分化为3个类群，在马来半岛和Wallacea存在遗传断裂，而X. moluccensis人口分化成两个群体，与遗传断裂目前只在整个马来半岛。在X. moluccensis，而X.主要结论木果属起源于冈瓦纳大陆的解体和随后的板块运动，其目前的分布范围应该是由今天的LDD而不是过去的大陆漂移。尽管LDD的能力，不同的人口结构的存在，跨越陆地障碍（巽他和Sahul货架）和洋流表明在X的扩散能力的差异限制。granatum和X.摩鹿加群岛
AimThe genus Xylocarpus contains two mangrove species, X. granatum and X. moluccensis, and a rare non-mangrove, X. rumphii. The two mangrove species are ideal models to study the biogeography of coastal plants with a unique dispersal ability, that is via buoyant propagules. We constructed the phylogeny of Xylocarpus and its relatives and determined the population structures of the two mangrove species. We aimed to elucidate the roles of continental drift and long-distance dispersal (LDD) in shaping the present-day distribution of Xylocarpusand to determine the factors affecting the patterns of population differentiation.LocationThe Indo-West Pacific (IWP) region.MethodsThirty populations of X. granatum, 15 of X. moluccensis and four of X. rumphii were sampled across the IWP region. Five chloroplast DNA intergenic spacers were sequenced for Xylocarpus and outgroup species to determine divergence times. The genetic diversity, divergence and structure of the two mangrove species were further analysed using five nuclear and two chloroplast DNA loci. Migrations between oceanic regions were estimated.ResultsThe genus Xylocarpus diverged from its sister genus Carapa approximately 19.4Ma. The populations of X. granatum differentiated into three groups, with genetic breaks present across the Malay Peninsula and Wallacea, whereas X. moluccensis populations differentiated into two groups, with a genetic break present only across the Malay Peninsula. Migration was also observed between populations of the Southeast Asian and Australasian regions in X. moluccensis but not in X. granatum.Main conclusionSince Xylocarpus originated after the breakup of Gondwana and subsequent plate motions, its current distribution range should have been facilitated by present-day LDD instead of past continental drift. Despite the capacity of LDD, the presence of differing population structures across land barriers (the Sunda and Sahul Shelves) and ocean currents indicated differential limitations in the dispersal capabilities of X. granatum and X. moluccensis.