Population genetics of Zamia decumbens (Zamiaceae, Cycadales), an endangered cycad from the Maya Mountains of Belize

IF 1.1 4区 生物学 Q4 ECOLOGY Plant Species Biology Pub Date : 2024-06-21 DOI:10.1111/1442-1984.12473
Michael Calonje, Alan W. Meerow, Jan Meerman, Javier Francisco‐Ortega, M. Patrick Griffith
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Abstract

We utilized 10 microsatellite loci to examine the genetic diversity, genetic structure, and demographic history of Zamia decumbens Calonje, Meerman, M.P. Griff. & Hoese, an endangered cycad species occurring in small populations on karst topography within the Maya Mountains of Belize. Four populations in two distinct habitats were sampled: three inside dolines (one at a cave entrance and two at the bottom of sinkholes) and one on a rocky hilltop. Genetic variation in the species reflects the demographic history of the sampled populations which appears closely linked to the karstification of the limestone bedrock on which it occurs rather than being structured geographically or by habitat type. Contemporary gene flow between populations is low, with the cave population facilitating most of the genetic connectivity in the region as a source of migrants to other populations. Coalescent‐based modeling revealed that the two sinkhole populations were established first, and the hilltop and cave populations were more recently founded from a common ancestral population. All populations were in Hardy–Weinberg equilibrium and moderately heterozygous, yet signatures for recent bottleneck events were recovered for the doline populations. Furthermore, a high inbreeding coefficient and high average pairwise relatedness were found for the hilltop population, the latter possibly the result of recent illegal harvesting activities.
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伯利兹玛雅山脉濒危苏铁植物 Zamia decumbens(苏铁科,Zamiaceae)的种群遗传学
我们利用 10 个微卫星位点研究了 Zamia decumbens Calonje、Meerman、M.P. Griff. & Hoese 的遗传多样性、遗传结构和人口历史。我们在两种不同的生境中采集了四个种群的样本:三个在岩洞内(一个在洞口,两个在天坑底部),一个在岩石山顶。该物种的基因变异反映了采样种群的人口历史,而这一历史似乎与石灰岩基岩的岩溶化密切相关,而不是按地理或栖息地类型划分的。当代种群之间的基因流动较少,洞穴种群作为其他种群的迁徙源,促进了该地区大部分基因的连接。基于聚合的建模显示,两个天坑种群是最早建立的,而山顶和洞穴种群是最近从一个共同的祖先种群建立的。所有种群都处于哈代-温伯格平衡和中等杂合状态,但在洞穴种群中发现了近期瓶颈事件的特征。此外,山顶种群的近交系数较高,平均配对亲缘关系也较高,后者可能是近期非法采伐活动的结果。
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来源期刊
Plant Species Biology
Plant Species Biology 生物-生态学
CiteScore
2.70
自引率
14.30%
发文量
36
审稿时长
>12 weeks
期刊介绍: Plant Species Biology is published four times a year by The Society for the Study of Species Biology. Plant Species Biology publishes research manuscripts in the fields of population biology, pollination biology, evolutionary ecology, biosystematics, co-evolution, and any other related fields in biology. In addition to full length papers, the journal also includes short research papers as notes and comments. Invited articles may be accepted or occasion at the request of the Editorial Board. Manuscripts should contain new results of empirical and/or theoretical investigations concerning facts, processes, mechanisms or concepts of evolutionary as well as biological phenomena. Papers that are purely descriptive are not suitable for this journal. Notes & comments of the following contents will not be accepted for publication: Development of DNA markers. The journal is introducing ''Life history monographs of Japanese plant species''. The journal is dedicated to minimizing the time between submission, review and publication and to providing a high quality forum for original research in Plant Species Biology.
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