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Reticulate evolution as a management challenge: Patterns of admixture with phylogenetic distance in endemic fishes of western North America.
Evolutionary Applications ( IF 4.1 ) Pub Date : 2020-06-29 , DOI: 10.1111/eva.13042 Max R Bangs 1, 2 , Marlis R Douglas 1 , Patrick C Brunner 3 , Michael E Douglas 1
Evolutionary Applications ( IF 4.1 ) Pub Date : 2020-06-29 , DOI: 10.1111/eva.13042 Max R Bangs 1, 2 , Marlis R Douglas 1 , Patrick C Brunner 3 , Michael E Douglas 1
Affiliation
Admixture in natural populations is a long‐standing management challenge, with population genomic approaches offering means for adjudication. We now more clearly understand the permeability of species boundaries and the potential of admixture for promoting adaptive evolution. These issues particularly resonate in western North America, where tectonism and aridity have fragmented and reshuffled rivers over millennia, in turn promoting reticulation among endemic fishes, a situation compounded by anthropogenic habitat modifications and non‐native introductions. The melding of historic and contemporary admixture has both confused and stymied management. We underscore this situation with a case study that quantifies basin‐wide admixture among a group of native and introduced fishes by employing double‐digest restriction site‐associated DNA (ddRAD) sequencing. Our approach: (a) quantifies the admixed history of 343 suckers (10 species of Catostomidae) across the Colorado River Basin; (b) gauges admixture within the context of phylogenetic distance and “ecological specialization”; and (c) extrapolates potential drivers of introgression across hybrid crosses that involve endemic as well as invasive species. Our study extends across an entire freshwater basin and expands previous studies more limited in scope both geographically and taxonomically. Our results detected admixture involving all 10 species, with habitat alterations not only accelerating the breakdown of reproductive isolation, but also promoting introgression. Hybridization occurred across the genus despite phylogenetic distance, whereas introgression was only detected within subgenera, implicating phylogenetic distance and/or ecological specialization as drivers of reproductive isolation. Understanding the extent of admixture and reproductive isolation across multiple species serves to disentangle their reticulate evolutionary histories and provides a broadscale perspective for basin‐wide conservation and management.
中文翻译:
网状进化是一项管理挑战:北美西部特有鱼类的混合系统进化距离模式。
在自然种群中掺混是一项长期的管理挑战,种群基因组学方法提供了裁决手段。现在,我们更加清楚地了解了物种边界的渗透性和外加剂促进适应性进化的潜力。这些问题在北美西部尤其引起共鸣,数千年来,构造运动和干旱使河流支离破碎和改组,反过来又促进了特有鱼类之间的网状化,这种情况由于人为栖息地的改良和非本地引进而加剧。历史和现代混合物的融合既使管理混乱又受阻。我们通过一个案例研究来强调这种情况,该案例通过使用双消化限制性位点相关DNA(ddRAD)测序来量化一组本地鱼类和引进鱼类之间的全流域混合。我们的方法:(a)量化横跨科罗拉多河流域的343个抽油者(10种猫科动物)的混合历史;(b)在系统发生距离和“生态专业化”的背景下对混合物进行计量;(c)推断涉及地方性和入侵性物种的杂交杂交中潜在的基因渗入驱动力。我们的研究覆盖了整个淡水盆地,并扩大了以前的研究范围,无论是在地理上还是在分类学上。我们的结果检测到涉及所有10种物种的混合体,栖息地的改变不仅加速了生殖隔离的破坏,而且还促进了渗入。尽管有系统发育距离,杂交仍在整个属中发生,而渗入仅在亚属内被检测到,暗示系统发育距离和/或生态专业化是生殖分离的驱动力。了解跨多个物种的混合和生殖隔离的程度有助于弄清其网状的进化历史,并为整个流域的保护和管理提供了广阔的前景。
更新日期:2020-06-29
中文翻译:
网状进化是一项管理挑战:北美西部特有鱼类的混合系统进化距离模式。
在自然种群中掺混是一项长期的管理挑战,种群基因组学方法提供了裁决手段。现在,我们更加清楚地了解了物种边界的渗透性和外加剂促进适应性进化的潜力。这些问题在北美西部尤其引起共鸣,数千年来,构造运动和干旱使河流支离破碎和改组,反过来又促进了特有鱼类之间的网状化,这种情况由于人为栖息地的改良和非本地引进而加剧。历史和现代混合物的融合既使管理混乱又受阻。我们通过一个案例研究来强调这种情况,该案例通过使用双消化限制性位点相关DNA(ddRAD)测序来量化一组本地鱼类和引进鱼类之间的全流域混合。我们的方法:(a)量化横跨科罗拉多河流域的343个抽油者(10种猫科动物)的混合历史;(b)在系统发生距离和“生态专业化”的背景下对混合物进行计量;(c)推断涉及地方性和入侵性物种的杂交杂交中潜在的基因渗入驱动力。我们的研究覆盖了整个淡水盆地,并扩大了以前的研究范围,无论是在地理上还是在分类学上。我们的结果检测到涉及所有10种物种的混合体,栖息地的改变不仅加速了生殖隔离的破坏,而且还促进了渗入。尽管有系统发育距离,杂交仍在整个属中发生,而渗入仅在亚属内被检测到,暗示系统发育距离和/或生态专业化是生殖分离的驱动力。了解跨多个物种的混合和生殖隔离的程度有助于弄清其网状的进化历史,并为整个流域的保护和管理提供了广阔的前景。