Landscape genetics of a threatened maple Acer miyabei: Implications for restoring riparian forest connectivity
Landscape genetics of a threatened maple Acer miyabei: Implications for restoring riparian forest connectivity
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受威胁枫树 Acer miyabei 的景观遗传学：对恢复河岸森林连通性的影响
DOI：
10.1016/j.biocon.2018.01.018
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发表时间：
2018
影响因子：
5.9
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Saeki;I.;Hirao;A.S.;Kenta;T.;Nagamitsu;T.;and Hiura;T.
由于森林破碎化影响生态连通性，建立廊道对保护生物多样性日益重要。保护河岸森林的连通性应该是一个优先事项，因为它们通常支持丰富而独特的生物群，但受到人类的极大改变。宫贝槭是一种生长在日本北部洪泛区生态系统中的濒危枫树。我们研究了森林破碎化对其遗传连通性的影响，并确定了恢复为河岸森林走廊的候选区域。我们采集了290株的叶片样本。利用12个微卫星位点确定了13个群体间的成对遗传距离。我们还计算了地理距离和抗性距离；后者是通过最小成本路径和电路理论模型量化的，通过指定森林或河岸森林地区比其他类型的土地利用具有更低的阻力。多元回归分析表明，遗传距离与抗性距离呈显著正相关，与地理距离无显著相关。结果表明，森林破碎化阻碍了该物种的基因流动。种群间的遗传分化在较小的树木组中比在较大的树木组中更大，这表明由于森林破碎化程度的增加，最近建立的个体比成熟的个体面临更大的遗传隔离。在毁林地区及其周围，遗传连通性的降低是明显的。在未来的景观规划中，这些地区可作为促进河岸生境连通性的目标。
Because forest fragmentation affects ecological connectivity, establishing corridors is increasingly important in conserving biodiversity. Conserving the connectivity of riparian forests should be a priority because they often support rich and unique biota but are greatly modified by humans.Acer miyabeiis a threatened maple which grows in floodplain ecosystems in northern Japan. We examined the effects of forest fragmentation on its genetic connectivity and identified candidate areas to be restored as riparian forest corridors. We collected leaf samples from 290 ofA. miyabeiindividuals in 13 populations and determined pairwise genetic distances among the populations using 12 microsatellite loci. We also calculated geographic and resistance distances; the latter was quantified by least-cost path and circuit theory models by designating forested or riparian forested areas as having lower resistance than other types of land use. According to multiple regression analyses, genetic distance showed significant positive relationships with resistance distance but was not significantly related to geographic distance. The results indicate that forest fragmentation impedes gene flow of the species. Genetic differentiation among populations was greater in the smaller tree group than in larger one, suggesting that more recently established individuals are exposed to greater genetic isolation than the mature individuals owing to increasing forest fragmentation over time. Reduction of genetic connectivity was conspicuous in and around deforested areas. Such areas can be targeted for promoting connectivity of riparian habitats in future landscape planning.