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首页> 美国卫生研究院文献>Heredity >Low levels of realized seed and pollen gene flow and strong spatial genetic structure in a small isolated and fragmented population of the tropical tree Copaifera langsdorffii Desf
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Low levels of realized seed and pollen gene flow and strong spatial genetic structure in a small isolated and fragmented population of the tropical tree Copaifera langsdorffii Desf

机译：在热带树木Copaifera langsdorffii Desf的少量孤立和零散的种群中实现的种子和花粉基因流动水平低并且具有强大的空间遗传结构

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Over the past century, the Brazilian Atlantic forest has been reduced to small, isolated fragments of forest. Reproductive isolation theories predict a loss of genetic diversity and increases in inbreeding and spatial genetic structure (SGS) in such populations. We analysed eight microsatellite loci to investigate the pollen and seed dispersal patterns, genetic diversity, inbreeding and SGS of the tropical tree Copaifera langsdorffii in a small (4.8 ha), isolated population. All 112 adult trees and 128 seedlings found in the stand were sampled, mapped and genotyped. Seedlings had significantly lower levels of genetic diversity (A=16.5±0.45, mean±95% s.e.; He=0.838±0.006) than did adult trees (A=23.2±0.81; He=0.893±0.030). Parentage analysis did not indicate any seed immigration (mseeds=0) and the pollen immigration rate was very low (mpollen=0.047). The average distance of realized pollen dispersal within the stand was 94 m, with 81% of the pollen travelling <150 m. A significant negative correlation was found between the frequency and distance of pollen dispersal (r=−0.79, P<0.01), indicating that short-distance pollinations were more frequent. A significant SGS for both adults (∼50 m) and seedlings (∼20 m) was also found, indicating that most of the seeds were dispersed over short distances. The results suggested that the spatial isolation of populations by habitat fragmentation can restrict seed and pollen gene flow, increase SGS and affect the genetic diversity of future generations.
机译：在过去的一个世纪中，巴西大西洋森林被缩小为孤立的小块森林。生殖隔离理论预测此类种群的遗传多样性将会丧失，近交和空间遗传结构（SGS）也会增加。我们分析了八个微卫星基因座，以调查在一个小的孤立种群中（4.8公顷）的热带树木Copaifera langsdorffii的花粉和种子传播模式，遗传多样性，近交和SGS。对在林分中发现的所有112棵成年树木和128棵幼苗进行采样，定位和基因分型。幼苗的遗传多样性水平显着低于成年树木（A = 23.2±0.81; He = 0.893±0.030）（A = 16.5±0.45，平均值±95％s.e.; He = 0.838±0.006）。亲子关系分析未显示任何种子迁移（种子= 0），花粉迁移率非常低（mpollen = 0.047）。展位内已实现花粉散布的平均距离为94μm，其中81％的花粉在150μm以下传播。花粉散布的频率与距离之间存在显着的负相关关系（r = -0.79，P <0.01），表明近距离授粉更为频繁。还发现成年（〜50μm）和幼苗（〜20μm）均具有显着的SGS，表明大部分种子分散在短距离内。结果表明，通过生境破碎化对种群进行空间隔离可以限制种子和花粉基因的流动，增加SGS并影响子孙后代的遗传多样性。

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