Newly discovered cichlid fish biodiversity threatened by hybridization with non-native species
Newly discovered cichlid fish biodiversity threatened by hybridization with non-native species
复制标题
新发现的丽鱼科鱼类生物多样性受到与非本地物种杂交的威胁
DOI：
10.1101/2020.08.06.240002
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Blackwell T
中科院分区：
文献类型：
--
作者：
Blackwell T
众所周知，入侵的淡水鱼很容易与当地的同类物种杂交，导致独特和不可替代的遗传资源的丧失。在这里，我们揭示了新发现的（2013-2016）来自坦桑尼亚南部的具有进化意义的Korogwe罗非鱼（Oreochromis korogwe）种群受到与较大入侵尼罗罗非鱼（Oreochromis niloticus）杂交的威胁。我们使用形态学、微卫星等位基因频率和全基因组序列相结合的方法来证明O.来自南部湖泊（Nambawala，Rutamba和Mitupa）的korogwee与坦桑尼亚北方（Zigi河和Mlingano大坝）地理上分离的种群不同。我们还提供了O的遗传证据。korogwe×niloticushybrids在三个南部湖泊，并证明在整个基因组的混合程度的异质性。最后，使用最少混合的基因组区域，我们估计北方和南方O. korogwepopulations最有可能分歧约140，000年前，这表明北方和南方群体的地理分离不是最近易位的结果，相反，这些人口代表独立的进化重要单位。我们的结论是，这些新发现的和表型独特的慈鲷种群已经受到威胁的杂交与入侵物种，并提出这些不可替代的遗传资源将受益于保护干预。
Invasive freshwater fishes are known to readily hybridize with indigenous congeneric species, driving loss of unique and irreplaceable genetic resources. Here we reveal that newly discovered (2013–2016) evolutionarily significant populations of Korogwe tilapia (Oreochromis korogwe) from southern Tanzania are threatened by hybridization with the larger invasive Nile tilapia (Oreochromis niloticus). We use a combination of morphology, microsatellite allele frequencies and whole genome sequences to show thatO. korogwefrom southern lakes (Nambawala, Rutamba and Mitupa) are distinct from geographically disjunct populations in northern Tanzania (Zigi River and Mlingano Dam). We also provide genetic evidence ofO. korogwe×niloticushybrids in three southern lakes and demonstrate heterogeneity in the extent of admixture across the genome. Finally, using the least admixed genomic regions we estimate that the northern and southernO. korogwepopulations most plausibly diverged ~140,000 years ago, suggesting that the geographical separation of the northern and southern groups is not a result of a recent translocation, and instead these populations represent independent evolutionarily significant units. We conclude that these newly discovered and phenotypically unique cichlid populations are already threatened by hybridization with an invasive species, and propose that these irreplaceable genetic resources would benefit from conservation interventions.
登录
查看更多内容
影响因子：
3.3
作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
通讯作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
影响因子：
2.7
作者：
Arroita, Maite;Flores, Lorea;Elosegi, Arturo
通讯作者：
Elosegi, Arturo
维多利亚湖和基奥加湖（东非）本土鱼类的减少以及外来物种的影响，特别是尼罗河鲈鱼、尼罗罗非鱼和尼罗罗非鱼
影响因子：
1.4
作者：
R. Ogutu
通讯作者：
R. Ogutu
罗非鱼的生物学和养殖
DOI：
--
发表时间：
1982
期刊：
影响因子：
--
作者：
R. Pullin;R. Lowe‐Mcconnell
通讯作者：
R. Lowe‐Mcconnell
影响因子：
10.7
作者：
Wendy A. Valencia-Montoya;S. Elfekih;Henry L. North;Joana I. Meier;I. Warren;W. T. Tay;K. Gordon;A. Specht;S. Paula-Moraes;R. Rane;T. Walsh;C. Jiggins
通讯作者：
Wendy A. Valencia-Montoya;S. Elfekih;Henry L. North;Joana I. Meier;I. Warren;W. T. Tay;K. Gordon;A. Specht;S. Paula-Moraes;R. Rane;T. Walsh;C. Jiggins