Contrasting effect of hybridization on genetic differentiation in three rockfish species with similar life history

IF 3.5 2区 生物学 Q1 EVOLUTIONARY BIOLOGY
Anita Wray, Eleni Petrou, Krista M. Nichols, Robert Pacunski, Larry LeClair, Kelly S. Andrews, Marty Kardos, Lorenz Hauser
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Abstract

Hybridization can provide evolutionary benefits (e.g., population resilience to climate change) through the introduction of adaptive alleles and increase of genetic diversity. Nevertheless, management strategies may be designed based only on the parental species within a hybrid zone, without considering the hybrids. This can lead to ineffective spatial management of species, which can directly harm population diversity and negatively impact food webs. Three species of rockfish (Brown Rockfish (Sebastes caurinus), Copper Rockfish (S. auriculatus), and Quillback Rockfish (S. maliger)) are known to hybridize within Puget Sound, Washington, but genetic data from these species are used to infer population structure in the entire genus, including in species that do not hybridize. The goal of this project was to estimate the hybridization rates within the region and determine the effect of hybridization on geographic patterns of genetic structure. We sequenced 290 Brown, Copper, and Quillback rockfish using restriction-site associated DNA sequencing (RADseq) from four regions within and outside Puget Sound, Washington. We show that (i) hybridization within Puget Sound was asymmetrical, not recent, widespread among individuals, and relatively low level within the genome, (ii) hybridization affected population structure in Copper and Brown rockfish, but not in Quillback Rockfish and (iii) after taking hybridization into account we found limited directional dispersal in Brown and Copper rockfish, and evidence for two isolated populations in Quillback Rockfish. Our results suggest that rockfish population structure is species-specific, dependent on the extent of hybridization, and cannot be inferred from one species to another despite similar life history.

Abstract Image

杂交对三种生活史相似的岩鱼遗传分化的不同影响
通过引入适应性等位基因和增加遗传多样性,杂交可带来进化方面的益处(如种群对气候变化的适应能力)。然而,管理策略的设计可能只基于杂交区内的亲本物种,而不考虑杂交种。这可能导致物种空间管理无效,直接损害种群多样性并对食物网产生负面影响。已知有三种岩鱼(褐岩鱼(Sebastes caurinus)、铜岩鱼(S. auriculatus)和魁背岩鱼(S. maliger))在华盛顿州普吉特湾发生杂交,但这些物种的遗传数据被用于推断整个岩鱼属的种群结构,包括未发生杂交的物种。本项目的目标是估计该地区的杂交率,并确定杂交对遗传结构地理模式的影响。我们使用限制性位点相关 DNA 测序(RADseq)对华盛顿州普吉特湾内外四个区域的 290 条褐、铜和魁背石首鱼进行了测序。我们的研究结果表明:(i) 普吉特海湾内的杂交是不对称的,不是最近才发生的,在个体之间很普遍,而且在基因组中的水平相对较低;(ii) 杂交影响了铜石首鱼和褐石首鱼的种群结构,但没有影响翘鼻石首鱼;(iii) 考虑到杂交因素后,我们发现褐石首鱼和铜石首鱼的定向扩散有限,而且有证据表明翘鼻石首鱼有两个孤立的种群。我们的研究结果表明,岩鱼的种群结构具有物种特异性,取决于杂交的程度,尽管生活史相似,但不能从一个物种推断到另一个物种。
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来源期刊
Evolutionary Applications
Evolutionary Applications 生物-进化生物学
CiteScore
8.50
自引率
7.30%
发文量
175
审稿时长
6 months
期刊介绍: Evolutionary Applications is a fully peer reviewed open access journal. It publishes papers that utilize concepts from evolutionary biology to address biological questions of health, social and economic relevance. Papers are expected to employ evolutionary concepts or methods to make contributions to areas such as (but not limited to): medicine, agriculture, forestry, exploitation and management (fisheries and wildlife), aquaculture, conservation biology, environmental sciences (including climate change and invasion biology), microbiology, and toxicology. All taxonomic groups are covered from microbes, fungi, plants and animals. In order to better serve the community, we also now strongly encourage submissions of papers making use of modern molecular and genetic methods (population and functional genomics, transcriptomics, proteomics, epigenetics, quantitative genetics, association and linkage mapping) to address important questions in any of these disciplines and in an applied evolutionary framework. Theoretical, empirical, synthesis or perspective papers are welcome.
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