Population genetics of Nelumbo lutea (American lotus) near its northwestern range limit

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany Pub Date : 2023-09-01 DOI:10.1016/j.aquabot.2023.103673

Bei Lu , John M. Nzei , Zhizhong Li , Jinming Chen , Xingyu Yang , Donna J. Perleberg

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Abstract

Nelumbo lutea Wild. (American lotus) has a broad and changing geographical distribution that is influenced by human transplanting and changes to climate, hydrology, and habitat. Populations vary from extensive stands where the species appears to be an effective colonizer, to sites where the species has declined or appears to have been extirpated. Previous studies in apparently stable populations from central and southern United States revealed low genetic diversity within and between populations. In this study, we assess genetic diversity at the northern edge of N. lutea’s range where it is often imperiled. A total of 489 individuals in 25 populations collected in Upper Mississippi River regions in Minnesota and Wisconsin were amplified in 12 microsatellite loci. Ten microsatellite loci indicated significant deviation from Hardy-Weinberg principal and were utilized for further analysis. Generally, genetic diversity was low compared to the genetic studies from southern North America. Despite low levels of genetic differentiation (Fst range; 0.003–0.059), structure and UPGMA analysis indicated the possibility of two distinct clusters and slight admixture in some populations. Initial low genetic diversity in populations was likely caused by founder effect if few individuals were established at each site. Limited migration and clonal growth contribute to the continued low diversity. We provide recommendations and research suggestions for the conservation of this species.

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美洲莲西北分布区的种群遗传学研究

野生莲藕。（美洲莲）有着广泛而不断变化的地理分布，受到人类移植和气候、水文和栖息地变化的影响。种群数量各不相同，从该物种似乎是有效殖民者的广阔林分，到该物种数量减少或似乎已经灭绝的地点。先前对美国中部和南部明显稳定的种群进行的研究表明，种群内部和种群之间的遗传多样性较低。在这项研究中，我们评估了木犀栖息地北部边缘的遗传多样性，那里的木犀经常受到威胁。在明尼苏达州和威斯康星州密西西比河上游地区采集的25个种群中，共有489个个体在12个微卫星位点上扩增。10个微卫星位点与Hardy-Weinberg原理存在显著偏差，可用于进一步分析。总体而言，与北美南部的遗传研究相比，遗传多样性较低。尽管遗传分化水平较低（Fst范围；0.003-0.059），但结构和UPGMA分析表明，在一些种群中可能存在两个不同的聚类和轻微的混合。如果在每个地点建立的个体很少，那么种群最初的低遗传多样性可能是由创始人效应引起的。有限的迁移和克隆生长导致了持续的低多样性。我们为保护该物种提供建议和研究建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aquatic Botany 生物-海洋与淡水生物学

CiteScore

3.80

自引率

5.60%

发文量

审稿时长

6 months

期刊介绍： Aquatic Botany offers a platform for papers relevant to a broad international readership on fundamental and applied aspects of marine and freshwater macroscopic plants in a context of ecology or environmental biology. This includes molecular, biochemical and physiological aspects of macroscopic aquatic plants as well as the classification, structure, function, dynamics and ecological interactions in plant-dominated aquatic communities and ecosystems. It is an outlet for papers dealing with research on the consequences of disturbance and stressors (e.g. environmental fluctuations and climate change, pollution, grazing and pathogens), use and management of aquatic plants (plant production and decomposition, commercial harvest, plant control) and the conservation of aquatic plant communities (breeding, transplantation and restoration). Specialized publications on certain rare taxa or papers on aquatic macroscopic plants from under-represented regions in the world can also find their place, subject to editor evaluation. Studies on fungi or microalgae will remain outside the scope of Aquatic Botany.