Strong genetic differentiation and low genetic diversity in a habitat-forming fucoid seaweed (Cystophora racemosa) across 850 km of its range.

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Jane M Edgeloe, Samuel Starko, Albert Pessarrodona, Melinda A Coleman, Jacqueline Batley, Thomas Wernberg, Georgina V Wood
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Abstract

Temperate seaweed forests are among the most productive and widespread habitats in coastal waters. However, they are under threat from climate change and other anthropogenic stressors. To effectively conserve and manage these ecosystems under these rising pressures, an understanding of the genetic diversity and structure of habitat-forming seaweeds will be necessary. Australia's Great Southern Reef, a global hotspot of endemic diversity, is home to one of the world's most speciose habitat-forming seaweed genera, Cystophora (order Fucales). Despite severe declines in some species, genomic data on this genus remain limited. We used a reduced representation genomic approach (DaRTSeq) to investigate the genetic diversity and structure of Cystophora racemosa, a dominant canopy-forming species, across ~850 km of its range. Our sequencing captured 4741 high-quality single nucleotide polymorphisms (SNPs), and we distinguished neutral loci from those under natural selection (i.e., outlier loci). We identified strong population structure and high genetic differentiation for both neutral (mean FST = 0.404) and outlier loci (mean FST = 0.901). Across populations, genetic diversity was low (neutral: mean HE = 0.046; outlier: HE = 0.042), with high inferred inbreeding (neutral loci mean FIS = 0.531) and no evidence of isolation-by-distance. Several SNPs (n = 70) were observed to be putatively adaptive, with most (97%) correlated with annual maximum sea surface temperature (SST, °C), indicating local adaptation to this key ocean variable. Our results show that C. racemosa populations have low genetic diversity and high differentiation, both of which may increase the vulnerability of this important foundation species to global change.

一种生长于850公里范围内形成栖息地的岩藻(Cystophora racemosa)遗传分化强,遗传多样性低。
温带海藻林是沿海水域最多产和最广泛的栖息地之一。然而,它们正受到气候变化和其他人为压力因素的威胁。为了在不断上升的压力下有效地保护和管理这些生态系统,有必要了解形成栖息地的海藻的遗传多样性和结构。澳大利亚的南大堡礁是全球特有多样性的热点,是世界上物种最多的栖息地形成海藻属之一的家园,水藻属(岩藻目)。尽管某些物种的数量严重下降,但该属的基因组数据仍然有限。本文采用简化表示基因组方法(DaRTSeq)对850 km范围内的总状囊藻(Cystophora racemosa)的遗传多样性和结构进行了研究。我们的测序捕获了4741个高质量的单核苷酸多态性(SNPs),并将中性位点与自然选择下的位点(即离群位点)区分开来。我们发现中性位点(平均FST = 0.404)和异常位点(平均FST = 0.901)的群体结构强,遗传分化高。种群间遗传多样性较低(中性:平均HE = 0.046;异常值:HE = 0.042),推断近亲繁殖率高(中性位点平均FIS = 0.531),无距离隔离证据。几个snp (n = 70)被观察到具有假定适应性,其中大多数(97%)与年最高海表温度(SST,°C)相关,表明对这一关键海洋变量的局部适应。本研究结果表明,总状藓居群遗传多样性低,分化程度高,这可能会增加这一重要基础物种对全球变化的脆弱性。
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来源期刊
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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