Cryptic genetic divergence of the red dwarf rasbora, <i>Microrasbora rubescens</i> , in and around Inle Lake: implications for the origin of endemicity in the ancient lake in Myanmar
Cryptic genetic divergence of the red dwarf rasbora, <i>Microrasbora rubescens</i> , in and around Inle Lake: implications for the origin of endemicity in the ancient lake in Myanmar
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茵莱湖及其周边红矮星红矮星红矮星红矮星的隐性遗传差异：对缅甸古湖地方性起源的影响
DOI：
10.1111/jfb.15195
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发表时间：
2022
影响因子：
2
通讯作者：
Watanabe Katsutoshi
中科院分区：
文献类型：
--
作者：
Fuke Yusuke;Kano Yuichi;Tun Sein;Yun LKC;Win Seint Seint;Watanabe Katsutoshi
茵莱湖是位于缅甸掸邦高原的一个古老湖泊，是一个具有高度鱼类特有性的生物地理吸引力地区。一些特有物种栖息在湖泊及周边地区。湖泊和周边地区种群之间的遗传和生态关系为了解茵莱湖鱼类动物区系形成的过程提供了重要的见解。在这项研究中，作者重点研究了该地区的特有属和物种——红矮星麦子Microrasbora rubescens，并使用来自茵莱湖和该湖周边三个地区的样本，基于全基因组多态性、线粒体DNA和几何形态测量分析，估计了其种群结构和进化情景。结果表明，M.冬凌草包含至少三个遗传上不同的谱系（Inle、Heho 和 Hopong），具有与核和 mtDNA 数据一致的独特地理结构。相比之下，形态上没有明显的区域分化。基于 mtDNA 的分歧时间估计表明，Hopong 谱系在 2.7 Ma 时分歧，Inle 和 Heho 谱系在 1.9 Ma 时分歧——与核 DNA 结果一致。在特有物种中观察到的深度分化支持了该地区鱼类动物发展的古代历史。该物种独特的区域分化和形态保守性可能是由限制扩散和形态多样化的死水环境中的生态位保守性造成的。未来对其他本土物种的全面遗传和形态分析和比较应该揭示塑造该地区鱼类动物群的地理和生态过程。
Inle Lake, an ancient lake located in the Shan Plateau of Myanmar, is a biogeographically attractive region with high fish endemism. Some endemic species inhabit the lake as well as the surrounding areas. The genetic and ecological relationships between populations in the lake and surrounding areas provide important insights into the process underlying ichthyofaunal formation in Inle Lake. In this study, the authors focused on red dwarf rasboraMicrorasbora rubescens, an endemic genus and species in this region, and estimated its population structure and evolutionary scenario based on genome‐wide polymorphism, mtDNA and geometric morphometric analyses using samples from Inle Lake and three areas surrounding the lake. The results showed thatM. rubescenscomprises at least three genetically divergent lineages (Inle, Heho and Hopong) with distinct geographic structures consistent with nuclear and mtDNA data. In contrast, there was no clear regional differentiation in morphology. The divergence time estimation based on mtDNA suggests that the Hopong lineage diverged at 2.7 Ma and the Inle and Heho lineages diverged at 1.9 Ma – consistent with the nuclear DNA results. The deep divergence observed in the endemic species supports the ancient history of ichthyofaunal development in this region. The distinct regional differentiation and morphological conservatism of this species might have been shaped by niche conservatism in stagnant water environments that limit dispersal and morphological diversification. Future comprehensive genetic and morphological analyses and comparisons for other native species should reveal the geographic and ecological processes that shaped the ichthyofauna in this region.