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首页> 外文期刊>Conservation Genetics >Contemporary pollen flow, mating patterns and effective population size inferred from paternity analysis in a small fragmented population of the Neotropical tree Copaifera langsdorffii Desf. (Leguminosae-Caesalpinioideae)
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Contemporary pollen flow, mating patterns and effective population size inferred from paternity analysis in a small fragmented population of the Neotropical tree Copaifera langsdorffii Desf. (Leguminosae-Caesalpinioideae)

机译：通过亲子关系分析，从新近生树木Copaifera langsdorffii Desf的一小块零碎种群中推断出当代花粉流量，交配模式和有效种群大小。 （豆科-es科）

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Pollen flow and dispersal patterns were investigated in a small, isolated forest fragment of the Neotropical insect pollinated tree Copaifera langsdorffii, using paternity analysis and eight microsatellite loci. We also investigated the coancestry and effective population size of progeny arrays for conservation and environmental restoration purposes. Open-pollinated seeds were collected from 15 seed trees within the forest fragment, in which all adult trees were mapped, measured and genotyped. Twenty seeds were also collected from the nearest neighbor tree located 1.2 km from the forest fragment. Our results show that levels of genetic diversity were significantly higher in adults than offspring and significant levels of inbreeding were detected in offspring (F = 0.226). From paternity analysis, we observed low levels of selfing (s = 8%) and pollen immigration (m = 8%) in the fragment, but very high levels were detected for the isolated tree (s = 20%; m = 75%), indicating that the population and the tree are not reproductively isolated and are connected by patterns of long distance pollen dispersal (maximum detected 1,420 m). Within the forest fragment, the pattern of pollen dispersal was a near neighbor pattern with 49% of the pollen being dispersed within 50 m. The effective population size of the progeny array was low, indicating the need to collect seeds from a large number of seed trees (at least 76) for conservation purposes. The results show that the spatial isolation of the population and isolated tree due to forest fragmentation has not disrupted genetic connectivity; however, spatial isolation does seem to increase selfing and correlated mating.
机译：使用亲子关系分析和八个微卫星基因座，研究了新热带昆虫授粉树Copaifera langsdorffii的一个小的孤立森林片段中的花粉流动和扩散模式。我们还研究了后代阵列的祖先和有效种群大小，以保护和恢复环境。从森林片段内的15棵种子树中收集开放授粉的种子，在其中对所有成年树进行定位，测量和基因分型。还从距离森林碎片1.2公里的最近的邻居树中收集了20种种子。我们的结果表明，成年后代的遗传多样性水平明显高于后代，并且在后代中发现了近交水平（F = 0.226）。从亲子关系分析中，我们观察到片段中的自交率低（s = 8％）和花粉迁移（m = 8％），但是对于离体的树木却检测到很高的水平（s = 20％; m = 75％） ，表明种群和树木没有生殖隔离，并通过长距离花粉散布模式连接（最大检测到1,420 m）。在森林碎片内，花粉的散布模式是近邻模式，其中49％的花粉散布在50m以内。后代阵列的有效种群数量很低，表明出于保护目的需要从大量种子树（至少76棵）中收集种子。结果表明，由于森林破碎而造成的种群和孤立树木的空间隔离并没有破坏遗传连通性。但是，空间隔离似乎确实增加了自交和相关的交配。

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