Genetic consequences of habitat fragmentation in a perennial plant Trillium camschatcense are subjected to its slow‐paced life history
Genetic consequences of habitat fragmentation in a perennial plant Trillium camschatcense are subjected to its slow‐paced life history
复制标题
多年生植物延龄草栖息地破碎化的遗传后果受到其缓慢生活史的影响
DOI：
10.1002/1438-390x.12093
复制
发表时间：
2021
影响因子：
1.7
通讯作者：
Ohara Masashi
中科院分区：
文献类型：
--
作者：
Tsuzuki Yoichi;Sato Mitsuhiko P.;Matsuo Ayumi;Suyama Yoshihisa;Ohara Masashi
许多野生种群由于生境破碎化而遭受遗传多样性的丧失，而物种和种群的多样性丧失程度因其生活史特征而有所不同。延龄草是一种多年生植物，在日本北海道的Tokachi地区经历了严重的生境破碎化。虽然已经报告了人口退化，如种子产量减少，但没有参照其生活史来研究碎片化的遗传后果。在这里，我们研究了生活史事件(例如，生长和繁殖)及其随机性如何影响两个(各自大小)片段T的遗传多样性。Camschatcense种群。利用全基因组2,008个单核苷酸多态(SNPs)对遗传多样性进行评估。在小群体中，新萌发幼苗的遗传多样性显著低于成熟的生活史阶段，有效育种者数(Nb)也小于大群体。利用矩阵种群模型进行的模拟表明，苗木的多样性损失是由繁殖过程中的遗传漂移引起的，而Small erNb加剧了遗传漂移。此外，使用随机扰动的转移矩阵的模拟表明，幼年阶段的停滞，这是一个共同的特征。通过缓冲随机减少来维持遗传多样性，这可能有助于种群的生存。虽然以前的研究表明促进繁殖和招募对于人口恢复的重要性，但这项研究强调了幼体存活在遗传多样性方面对保护碎片化T的关键作用。Camschatcense在Tokachi地区的人口。
Many wild populations are suffering from the loss of genetic diversity caused by habitat fragmentation, while the degree of diversity loss differs among species and populations based on their life history characteristics.Trillium camschatcense, an understory perennial plant, has undergone intensive habitat fragmentation in the Tokachi region, Hokkaido, Japan. Although demographic deteriorations, such as reduced seed production, were already reported, genetic consequences of fragmentation have not been studied with reference to its life history. Here, we examined how life history events (e.g., growth and reproduction) and the stochasticity therein influence genetic diversity in two (each large and small) fragmentedT. camschatcensepopulations. Genetic diversity was evaluated using genome‐wide 2,008 single nucleotide polymorphisms (SNPs). In the small population, genetic diversity of newly germinated seedlings was significantly lower than that of matured life history stages, and effective number of breeders (Nb) was smaller than that of the large population. Simulations using a matrix population model showed that the diversity loss at seedlings is caused by genetic drift during reproduction, which was intensified by smallerNb. Besides, simulations using randomly perturbed transition matrices suggested that stasis at juvenile stages, which is a common characteristics ofT. camschatcense, maintains genetic diversity by buffering stochastic decrease, possibly contributing to population viability. While previous studies showed the importance to facilitate reproduction and recruitment for demographic recovery, this study highlighted the crucial roles of juvenile survival in terms of genetic diversity for the conservation of fragmentedT. camschatcensepopulations in the Tokachi region.