Evolutionary history of Otophysi (Teleostei), a major clade of the modern freshwater fishes: Pangaean origin and Mesozoic radiation.
Evolutionary history of Otophysi (Teleostei), a major clade of the modern freshwater fishes: Pangaean origin and Mesozoic radiation.
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DOI：
10.1186/1471-2148-11-177
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发表时间：
2011-06-22
影响因子：
3.4
通讯作者：
Nishida M
中科院分区：
文献类型：
--
作者：
Nakatani M;Miya M;Mabuchi K;Saitoh K;Nishida M
淡水港约12，000种鱼类占所有现代鱼类多样性的43%。一个单一的祖先谱系进化成了这个巨大的生物多样性的三分之二（约7900种）。目前分布在除南极洲以外的世界各大洲。尽管如此显着的物种多样性和普遍性，这个主要的淡水鱼分支，耳鞭鱼的进化历史，仍然在很大程度上未被探索。为了深入了解otopolitan多样化的历史，我们构建了一个基于整个有丝分裂基因组序列的110个物种，代表64个家族中的55个。分区的最大似然分析的基础上明确对齐的序列（9923 bp）自信地恢复了单系耳和两个组成亚组（鲤形目和Characiphysi）。后一个分支包括三个目（裸形目，Characiformes，Siluriformes），裸形目是后两个组的姐妹。在溪形目的两个亚目中，有一个亚目（溪形亚目）与鲶形目的关系比它自己的亚目（狐形亚目）更近，使溪形目成为并系的。虽然这种新的关系没有得到强有力的统计学支持，但它得到了独立核标记物分析的支持。一个宽松的分子钟贝叶斯分析的分歧时间和重建的祖先栖息地上的树木提出了一个盘古起源和中生代辐射的otopterians。目前的研究表明，通过对泛大陆的两次连续的大规模灭绝，以及随后的辐射在侏罗纪到早白垩世形成了现代的家庭多样性otopterians的祖先血统的生存。这种进化的情况是一致的，最近的论点的基础上，地理推断和分子分歧的时间估计。然而，在Albian（白垩纪早期100-112 Ma）之前，没有记录到任何化石，创造了超过1亿年的时间跨度，没有化石证据。这个可怕的幽灵范围部分反映了茎组起源（分子分歧时间）和冠组形态多样化（化石分歧时间）的估计年龄之间的真正差异;然而，幽灵范围将充满更古老的化石的发现，可以用作更合理的时间限制，以及更现实的模型的发展，准确地捕捉分子序列的速率。
Freshwater harbors approximately 12,000 fish species accounting for 43% of the diversity of all modern fish. A single ancestral lineage evolved into about two-thirds of this enormous biodiversity (≈ 7900 spp.) and is currently distributed throughout the world's continents except Antarctica. Despite such remarkable species diversity and ubiquity, the evolutionary history of this major freshwater fish clade, Otophysi, remains largely unexplored. To gain insight into the history of otophysan diversification, we constructed a timetree based on whole mitogenome sequences across 110 species representing 55 of the 64 families. Partitioned maximum likelihood analysis based on unambiguously aligned sequences (9923 bp) confidently recovered the monophyly of Otophysi and the two constituent subgroups (Cypriniformes and Characiphysi). The latter clade comprised three orders (Gymnotiformes, Characiformes, Siluriformes), and Gymnotiformes was sister to the latter two groups. One of the two suborders in Characiformes (Characoidei) was more closely related to Siluriformes than to its own suborder (Citharinoidei), rendering the characiforms paraphyletic. Although this novel relationship did not receive strong statistical support, it was supported by analyzing independent nuclear markers. A relaxed molecular clock Bayesian analysis of the divergence times and reconstruction of ancestral habitats on the timetree suggest a Pangaean origin and Mesozoic radiation of otophysans. The present timetree demonstrates that survival of the ancestral lineages through the two consecutive mass extinctions on Pangaea, and subsequent radiations during the Jurassic through early Cretaceous shaped the modern familial diversity of otophysans. This evolutionary scenario is consistent with recent arguments based on biogeographic inferences and molecular divergence time estimates. No fossil otophysan, however, has been recorded before the Albian, the early Cretaceous 100-112 Ma, creating an over 100 million year time span without fossil evidence. This formidable ghost range partially reflects a genuine difference between the estimated ages of stem group origin (molecular divergence time) and crown group morphological diversification (fossil divergence time); the ghost range, however, would be filled with discoveries of older fossils that can be used as more reasonable time constraints as well as with developments of more realistic models that capture the rates of molecular sequences accurately.
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影响因子：
5.4
作者：
Brown JW;Rest JS;García-Moreno J;Sorenson MD;Mindell DP
通讯作者：
Mindell DP
影响因子：
64.8
作者：
CHENG, S;CHANG, SY;RESPESS, R
通讯作者：
RESPESS, R
影响因子：
3.5
作者：
Chen, Wei-Jen;Miya, Masaki;Mayden, Richard L.
通讯作者：
Mayden, Richard L.
影响因子：
1.4
作者：
Arratia, G;Scasso, RA;Kiessling, W
通讯作者：
Kiessling, W
影响因子：
1.9
作者：
Asahida, T;Kobayashi, T;Nakayama, I
通讯作者：
Nakayama, I