目的:分布在台湾南部和菲律宾北部之间的植物分布在强大的黑潮横穿的地区的许多小岛中。洋流可以成为沿海植物物种的有效种子散布剂。此外,吕宋海峡是一个容易发生热带气旋的地区。这项研究的目的是研究濒临灭绝的沿海植物物种的扩散能力,Mearns无花果(Ficuspedunculosavar。mearnsii),使用实验和群体遗传学方法。
方法:台湾南部,菲律宾,以及吕宋岛和台湾岛之间的岛屿。
方法:本研究结合了两种类型的分析,即,syconia和双消化限制性相关DNA测序(ddRAD)的浮力实验,分析Mearns无花果的种群遗传学。
结果:我们首先发现成熟的Mearns无花果suconia可以漂浮在海水中。它们的平均浮动持续时间为10天至最多21天。经过不同持续时间的浮选处理的Mearns无花果种子之间的发芽率差异很大。种群遗传分析表明,各种Mearns无花果种群之间的近亲繁殖程度很高。此外,在种群和个体之间没有发现距离隔离。
结论:根据我们对Mearns无花果种群遗传结构的分析,我们可以清楚地强调黑潮洋流对无花果树种子扩散的影响。综合分析表明,在成熟的syconium沉入海水之前,Mearns无花果种子仍然可以存活,因此,他们可以利用黑潮水流漂浮到台湾目前的人口位置。
OBJECTIVE: Plants distributed between southern Taiwan and the north of the Philippines are spread among numerous small islands in an area crossed by the powerful Kuroshio current. Oceanic currents can be effective seed-dispersal agents for coastal plant species. Moreover, the Luzon Strait is an area prone to tropical cyclones. The aim of this study is to look at the dispersal capability of an endangered coastal plant species, the Mearns fig (Ficus pedunculosa var. mearnsii), using both experimental and population genetics methods.
METHODS: Southern Taiwan, the Philippines, and the islands between Luzon and Taiwan Island.
METHODS: This study combined two types of analysis, i.e., buoyancy experiments on syconia and double digest restriction-associated DNA sequencing (ddRAD), to analyze the population genetics of the Mearns fig.
RESULTS: We first discovered that mature Mearns fig syconia could float in seawater. They have a mean float duration of 10 days to a maximum of 21 days. Germination rates varied significantly between Mearns fig seeds that had undergone different durations of flotation treatment. Population genetic analysis shows a high degree of inbreeding among various Mearns fig populations. Moreover, no isolation by distance was found between the populations and individuals.
CONCLUSIONS: From our analysis of the genetic structure of the Mearns fig populations, we can clearly highlight the effect of the Kuroshio oceanic current on the seed dispersal of this fig tree. Comprehensive analysis has shown that Mearns fig seeds are still viable before the mature syconium sinks into the seawater, and so they could use the Kuroshio Current to float to the current population locations in Taiwan.