Detecting the early genetic effects of habitat degradation in small size remnant populations of Machilus thunbergii Sieb. et Zucc. (Lauraceae).
Detecting the early genetic effects of habitat degradation in small size remnant populations of Machilus thunbergii Sieb. et Zucc. (Lauraceae).
复制标题
检测小规模楠楠残余种群栖息地退化的早期遗传效应。
DOI：
10.1155/2017/9410626
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发表时间：
2017
影响因子：
--
通讯作者：
N. Noma
中科院分区：
文献类型：
--
作者：
S. Watanabe;Y. Kaneko;Y. Maesako;N. Noma
人类活动造成的生境退化减少了世界各地许多植物种群的规模，通常对遗传产生负面影响。然而，在树种中检测这种影响并不容易，因为树木的寿命很长。et Zucc.樟科（Lauraceae）是万年青林的优势树种，主要分布于沿着日本海岸。该物种的内陆生境因人类活动而退化。为了探讨生境退化对遗传结构的影响，我们比较了5种红树林的成树和幼龄树的遗传差异。在日本的琵琶湖附近有一个黑松种群。等位基因多样性的影响，过去的血统混合事件，但森林大小的影响还不清楚。另一方面，幼龄阶段的近交系数在小种群中较高，而大种群则保持着泛系繁殖。此外，遗传分化的程度是更大的少年比在成熟的树木。我们检测到栖息地退化的早期遗传效应在小，isolatedM。thunbergiipopulations，表明生境退化增加了种群间的近亲繁殖和遗传分化。
Habitat degradation caused by human activities has reduced the sizes of many plant populations worldwide, generally with negative genetic impacts. However, detecting such impacts in tree species is not easy because trees have long life spans.Machilus thunbergiiSieb. et Zucc. (Lauraceae) is a dominant tree species of broad‐leaved evergreen forests distributed primarily along the Japanese coast. Inland habitats for this species have become degraded by human activities. To investigate the effects of habitat degradation on genetic structure, we compared the genetic diversities of mature and juvenile trees of fiveM. thunbergiipopulations around Lake Biwa in Japan. Allelic diversity was influenced by past lineage admixture events, but the effects of forest size were not clear. On the other hand, the inbreeding coefficient of the juvenile stage was higher in small populations, whereas large populations maintained panmictic breeding. Also, the extent of genetic differentiation was greater in juveniles than in mature trees. We detected the early genetic effects of habitat degradation in small, isolatedM. thunbergiipopulations, indicating that habitat degradation increases inbreeding and genetic differentiation between populations.