Mitogenomic phylogeny,biogeography,and cryptic divergence of the genus Silurus(Siluriformes:Siluridae)  

作　　者：Weitao Chen Nicolas Hubert Yuefei Li Shuli Zhu Jun Wang Denggao Xiang Shang Gao Chunni Kou Jilong Wang Tai Wang Zhiqiang Liang Junjie Wu Xinhui Li Jie Li 

机构地区：[1]Pearl River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Guangzhou,Guangdong 510380,China [2]China Key Laboratory of Aquatic Animal Immune Technology of Guangdong Province,Guangzhou,Guangdong 510380,China [3]Key Laboratory of Prevention and Control for Aquatic Invasive Alien Species,Ministry of Agriculture and Rural Affairs,Guangzhou,Guangdong 510380,China [4]Scientific Observing and Experimental Station of National Fisheries Resources and Environment,Guangzhou,Guangdong 510380,China [5]Institut de Recherche pour le Développement,Montpellier,UMR 226 ISEM(UM-CNRS-IRD),France [6]State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China,Xi’an University of Technology,Xi’an,Shaanxi 710048,China [7]Heilongjiang River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Harbin,Heilongjiang 150076,China [8]Gansu Fisheries Research Institute,Lanzhou,Gansu 730030,China [9]Hunan Fisheries Science Institute,Changsha,Hunan 410153,China [10]Yunnan Institute of Fishery Sciences Research,Kunming,Yunnan 650111,China

出　　处：《Zoological Research》2024年第4期711-723,共13页动物学研究（英文）

基　　金：National Natural Science Foundation of China(32000306);Project of Innovation Team of Survey and Assessment of the Pearl River Fishery Resources(2023TD-10);Natural Science Foundation of Shaanxi Province(2023-JC-YB-325)。

摘　　要：The genus Silurus,an important group of catfish,exhibits heterogeneous distribution in Eurasian freshwater systems.This group includes economically important and endangered species,thereby attracting considerable scientific interest.Despite this interest,the lack of a comprehensive phylogenetic framework impedes our understanding of the mechanisms underlying the extensive diversity found within this genus.Herein,we analyzed 89 newly sequenced and 20 previously published mitochondrial genomes(mitogenomes)from 13 morphological species to reconstruct the phylogenetic relationships,biogeographic history,and species diversity of Silurus.Our phylogenetic reconstructions identified eight clades,supported by both maximum-likelihood and Bayesian inference.Sequence-based species delimitation analyses yielded multiple molecular operational taxonomic units(MOTUs)in several taxa,including the Silurus asotus complex(four MOTUs)and Silurus microdorsalis(two MOTUs),suggesting that species diversity is underestimated in the genus.A reconstructed time-calibrated tree of Silurus species provided an age estimate of the most recent common ancestor of approximately 37.61 million years ago(Ma),with divergences among clades within the genus occurring between 11.56 Ma and 29.44 Ma,and divergences among MOTUs within species occurring between 3.71 Ma and 11.56 Ma.Biogeographic reconstructions suggested that the ancestral area for the genus likely encompassed China and the Korean Peninsula,with multiple inferred dispersal events to Europe and Central and Western Asia between 21.78 Ma and 26.67 Ma and to Japan between 2.51 Ma and 18.42 Ma.Key factors such as the Eocene-Oligocene extinction event,onset and intensification of the monsoon system,and glacial cycles associated with sea-level fluctuations have likely played significant roles in shaping the evolutionary history of the genus Silurus.

关 键 词：Maximum likelihood Bayesian inferences Ancestral area estimation Cryptic diversity Dispersal pathways Mitogenomes Sea levels 

分 类 号：S917.4[农业科学—水产科学]