Introgressive hybridization levels of Tilapiine species in Lake Victoria basin, Kenya inferred from microsatellite and mitochondrial DNA genotyping based on next-generation sequencing

IF 2 3区环境科学与生态学 Q2 BIODIVERSITY CONSERVATION

Conservation Genetics Pub Date : 2023-09-27 DOI:10.1007/s10592-023-01570-x

Gerald Kwikiriza, Thapasya Vijayan, Papius Dias Tibihika, Manuel Curto, Gerold Winkler, Juliet Kigongo Nattabi, John Kariuki, Harald Meimberg

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Abstract

Abstract Despite their high abundance and species richness, tilapiines have been compromised by various factors especially overfishing, climate change, and uncontrolled fish transfers and introductions. Fish introductions have negatively impacted native tilapiine populations through competition, predation, hybridization, and introgression compromising their genetic integrity. The hybridization levels of different tilapiines in the Lake Victoria basin remain relatively understudied. The study utilized nuclear microsatellite and mitochondrial DNA (mtDNA) genetic markers to investigate hybridization signals and compare the genetic diversity of different tilapiines in Lake Victoria, Kenya, using next-generation sequencing. Low levels of hybridization from Oreochromis niloticus into other Oreochromis species were detected by Bayesian clustering analysis and principal coordinate analysis (PCoA). The results contribute to the need for conservation measures for these fish species.

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基于下一代测序的微卫星和线粒体DNA基因分型研究了肯尼亚维多利亚湖流域罗非鱼物种的渐渗杂交水平

尽管罗非鱼的丰度和物种丰富度很高，但由于各种因素，特别是过度捕捞、气候变化和不受控制的鱼类转移和引进，罗非鱼的数量受到了损害。鱼类引进通过竞争、捕食、杂交和基因渗入损害了当地罗非鱼种群的遗传完整性，对其产生了负面影响。对维多利亚湖流域不同罗非鱼杂交水平的研究相对较少。该研究利用核微卫星和线粒体DNA (mtDNA)遗传标记研究了肯尼亚维多利亚湖不同罗非鱼的杂交信号，并利用下一代测序技术比较了不同罗非鱼的遗传多样性。通过贝叶斯聚类分析和主坐标分析(PCoA)发现，nilochromis与其他Oreochromis物种的杂交水平较低。研究结果表明，有必要对这些鱼类采取保护措施。

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来源期刊

Conservation Genetics 环境科学-生物多样性保护

CiteScore

3.80

自引率

4.50%

发文量

审稿时长

1 months

期刊介绍： Conservation Genetics promotes the conservation of biodiversity by providing a forum for data and ideas, aiding the further development of this area of study. Contributions include work from the disciplines of population genetics, molecular ecology, molecular biology, evolutionary biology, systematics, forensics, and others. The focus is on genetic and evolutionary applications to problems of conservation, reflecting the diversity of concerns relevant to conservation biology. Studies are based on up-to-date technologies, including genomic methodologies. The journal publishes original research papers, short communications, review papers and perspectives.