Global-Scale Analysis Reveals Importance of Environment and Species Traits in Spatial Patterns of Riparian Plants' Genetic Diversity

IF 6.3 1区环境科学与生态学 Q1 ECOLOGY

Global Ecology and Biogeography Pub Date : 2025-02-14 DOI:10.1111/geb.70010

Bartłomiej Surmacz, Patricia María Rodríguez González, Roland Jansson, Tomasz Suchan, Remigiusz Pielech

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引用次数: 0

Abstract

Aim

In riparian zones along rivers, plant demography is shaped by hydrologic disturbances, the dendritic structure of the river networks, and asymmetric gene flow due to the prevalence of unidirectional dispersal by hydrochory. Downstream-biased dispersal may lead to the accumulation of genetic diversity in populations situated lower within the catchment area—a phenomenon referred to as ‘downstream increase in intraspecific genetic diversity’ (DIGD). Our study aimed to test if the presence of this pattern in riparian plants depends on the species traits, sampling design and ecosystem integrity.

Location

Riparian zones along rivers worldwide.

Time Period

1978–2023.

Major Taxa Studied

Vascular plants.

Methods

We conducted meta-analysis of population genetic studies on riparian plants to identify the factors linked to the occurrence of the DIGD pattern. We modelled the correlation between position along rivers and population genetic diversity using a dataset consisting of variables extracted from the studies, supplemented by data from plant trait databases.

Results

We found no evidence for a general trend in plant genetic diversity along rivers, but species traits and environmental factors partially explained the patterns. A downstream increase in genetic diversity was more likely to be found in species capable of hydrochoric dispersal and along the unmodified rivers which maintain habitat continuity.

Main Conclusions

Our study highlights that different patterns of genetic diversity can be linked to species traits or different levels of habitat fragmentation. Population genetic studies of riparian plants have frequently investigated patterns of genetic diversity in remnant populations in degraded riparian habitats. Although such investigations are important, more population studies of common plants in well-preserved riparian zones are needed, as these can help understanding the general mechanisms that control natural population dynamics of plant species.

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全球尺度分析揭示了环境和物种特征在河岸植物遗传多样性空间格局中的重要性

在沿河流的河岸带，植物的种群分布是由水文干扰、河流网络的树突状结构和由于水文的单向扩散而导致的不对称基因流动所决定的。下游偏散可能导致位于集水区较低位置的种群的遗传多样性积累，这种现象被称为“种内遗传多样性下游增加”（DIGD）。我们的研究旨在测试这种模式在河岸植物中的存在是否取决于物种特征、采样设计和生态系统完整性。地理位置全球河流沿岸的河岸地带。时间period1978 - 2023。维管植物的主要分类群。方法我们对河岸植物群体遗传研究进行了荟萃分析，以确定与DIGD模式发生相关的因素。我们利用从研究中提取的变量组成的数据集，并辅以植物性状数据库的数据，建立了沿河位置与种群遗传多样性之间的相关性模型。结果沿江植物遗传多样性的变化趋势不明显，但物种特征和环境因素可以部分解释这一变化趋势。下游遗传多样性的增加更可能发生在能够在水中扩散的物种和沿着保持栖息地连续性的未修改河流的物种中。主要结论不同的遗传多样性模式可能与物种性状或不同程度的生境破碎化有关。河岸植物群体遗传研究经常对退化河岸生境中残余种群的遗传多样性模式进行研究。尽管这些调查很重要，但需要对保存良好的河岸带的常见植物进行更多的种群研究，因为这些研究有助于了解控制植物物种自然种群动态的一般机制。

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来源期刊

Global Ecology and Biogeography 环境科学-生态学

CiteScore

12.10

自引率

3.10%

发文量

170

审稿时长

3 months

期刊介绍： Global Ecology and Biogeography (GEB) welcomes papers that investigate broad-scale (in space, time and/or taxonomy), general patterns in the organization of ecological systems and assemblages, and the processes that underlie them. In particular, GEB welcomes studies that use macroecological methods, comparative analyses, meta-analyses, reviews, spatial analyses and modelling to arrive at general, conceptual conclusions. Studies in GEB need not be global in spatial extent, but the conclusions and implications of the study must be relevant to ecologists and biogeographers globally, rather than being limited to local areas, or specific taxa. Similarly, GEB is not limited to spatial studies; we are equally interested in the general patterns of nature through time, among taxa (e.g., body sizes, dispersal abilities), through the course of evolution, etc. Further, GEB welcomes papers that investigate general impacts of human activities on ecological systems in accordance with the above criteria.