Riverscape genomics of the endangered freshwater mussel Lampsilis rafinesqueana

IF 2.8 2区生物学 Q2 ECOLOGY

Freshwater Biology Pub Date : 2024-08-18 DOI:10.1111/fwb.14317

Steven R. Hein, Keaka Farleigh, David J. Berg

引用次数: 0

Abstract

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濒危淡水贻贝 Lampsilis rafinesqueana 的河景基因组学

历史上急剧的气候变化以及相关的直接和间接影响（如冰川作用和排水系统的重组）对许多水生类群的生物多样性、种系分化和当代遗传变异的形成具有重要意义。通过了解这些古老的陆地和水域景观变化对当前多样性的影响，实践者可以在制定保护策略时考虑到物种独特的进化历史。我们调查了美国内陆地区特有的极度濒危淡水贻贝 Lampsilis rafinesqueana 的种内遗传多样性。我们的研究（1）描述了种群内部和种群之间的遗传变异特征，以推断生物地理历史；（2）将遗传信息应用于潜在的保护策略。我们应用限制位点相关 DNA 测序和线粒体 DNA 测序来研究整个物种分布区中 L. rafinesqueana 种群内部和种群之间的遗传多样性。然后，我们结合历史上的河流景观过程和对保护的适用性考虑了这些信息。河流内部的变异情况类似，但我们发现了与两个主要生态区域（中部内陆高地和奥萨吉平原）相关的不同遗传种群。平原种群的 Ne 值约为高原种群的 10 倍。历史人口模型表明，这两个种群在大约 120 万年前分化，然后在大约 19700 年前，两个种群的数量都出现了大幅下降。这两个重大事件分别与历史上已知的快速气候变化时期相关。我们发现了联邦濒危贻贝 L. rafinesqueana 的两个不同种群。该物种的当代遗传多样性受到历史上气候快速变化的直接和间接影响。高原种群经历了典型的更新世后气候变化的近期扩张，同时其 Ne 值也比平原种群大得多。我们的研究结果表明，这两个不同种群之间跨代的基因流动水平较低。我们建议该物种的保护管理者在制定管理策略时考虑种群间多样性的相对差异。在许多物种中，只有在极端情况下，才会考虑在基因独特的种群之间进行辅助基因流动；然而，对于虹鳟来说，种群之间的低水平辅助迁移可能是维持自然遗传变异水平的一种有价值的策略。我们的研究表明，生物地理框架有助于制定保护策略，以保留代表目标淡水物种进化潜力的重要基因组变异。

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来源期刊

Freshwater Biology 生物-海洋与淡水生物学

CiteScore

5.90

自引率

3.70%

发文量

162

审稿时长

2 months

期刊介绍： Freshwater Biology publishes papers on all aspects of the ecology of inland waters, including rivers and lakes, ground waters, flood plains and other freshwater wetlands. We include studies of micro-organisms, algae, macrophytes, invertebrates, fish and other vertebrates, as well as those concerning whole systems and related physical and chemical aspects of the environment, provided that they have clear biological relevance. Studies may focus at any level in the ecological hierarchy from physiological ecology and animal behaviour, through population dynamics and evolutionary genetics, to community interactions, biogeography and ecosystem functioning. They may also be at any scale: from microhabitat to landscape, and continental to global. Preference is given to research, whether meta-analytical, experimental, theoretical or descriptive, highlighting causal (ecological) mechanisms from which clearly stated hypotheses are derived. Manuscripts with an experimental or conceptual flavour are particularly welcome, as are those or which integrate laboratory and field work, and studies from less well researched areas of the world. Priority is given to submissions that are likely to interest a wide range of readers. We encourage submission of papers well grounded in ecological theory that deal with issues related to the conservation and management of inland waters. Papers interpreting fundamental research in a way that makes clear its applied, strategic or socio-economic relevance are also welcome. Review articles (FRESHWATER BIOLOGY REVIEWS) and discussion papers (OPINION) are also invited: these enable authors to publish high-quality material outside the constraints of standard research papers.