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ZHENG Lianming,HE Jinru,LIN Yuanshao,CAO Wenqing,ZHANG Wenjing. 2014. 16S rRNA is a better choice than COI for DNA barcoding hydrozoans in the coastal waters of China. Acta Oceanologica Sinica, 33(4):55-76
16S rRNA is a better choice than COI for DNA barcoding hydrozoans in the coastal waters of China
16S rRNA is a better choice than COI for DNA barcoding hydrozoans in the coastal waters of China
Received:June 17, 2013  Revised:October 20, 2013
DOI:10.1007/s13131-014-0415-8
Key words:DNA barcoding  hydrozoan  COI  16S rRNA
中文关键词:  DNA barcoding  hydrozoan  COI  16S rRNA
基金项目:The National Natural Science Foundation of China under contract No. 41006078; the Fundamental Research Funds for the Central Universities under contract No. 2010121037; the Public Science and Technology Research Funds Projects of Ocean under contract Nos 201005012-3 and 201005015-5; the Natural Science Foundation of Fujian Province of China under contract No. 2011J05116.
Author NameAffiliationE-mail
ZHENG Lianming College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
Marine Biodiversity and Global Change Research Center, Xiamen University, Xiamen 361005, China
Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies (CEES), Xiamen University, Xiamen 361005, China 
zhlm@xmu.edu.cn 
HE Jinru College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China  
LIN Yuanshao College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
Marine Biodiversity and Global Change Research Center, Xiamen University, Xiamen 361005, China 
 
CAO Wenqing College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
Marine Biodiversity and Global Change Research Center, Xiamen University, Xiamen 361005, China 
 
ZHANG Wenjing College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
Marine Biodiversity and Global Change Research Center, Xiamen University, Xiamen 361005, China 
 
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Abstract:
      Identification of hydrozoan species is challenging, even for taxonomic experts, due to the scarcity of distinct morphological characters and phenotypic plasticity. DNA barcoding provides an efficient method for species identification, however, the choice between mitochondrial cytochrome c oxidase subunit Ⅰ (COI) and large subunit ribosomal RNA gene (16S) as a standard barcode for hydrozoans is subject to debate. Herein, we directly compared the barcode potential of COI and 16S in hydrozoans using 339 sequences from 47 pelagic hydrozoan species. Analysis of Kimura 2-parameter genetic distances (K2P) documented the mean intraspecific/interspecific variation for COI and 16S to be 0.004/0.204 and 0.003/0.223, respectively. An obvious "barcoding gap" was detected for all species in both markers and all individuals of a species clustered together in both the COI and 16S trees. These results suggested that the species within the studied taxa can be efficiently and accurately identified by COI and 16S. Furthermore, our results confirmed that 16S was a better phylogenetic marker for hydrozoans at the genus level, and in some cases at the family level. Considering the resolution and effectiveness for barcoding and phylogenetic analyses of Hydrozoa, we strongly recommend 16S as the standard barcode for hydrozoans.
中文摘要:
      Identification of hydrozoan species is challenging, even for taxonomic experts, due to the scarcity of distinct morphological characters and phenotypic plasticity. DNA barcoding provides an efficient method for species identification, however, the choice between mitochondrial cytochrome c oxidase subunit Ⅰ (COI) and large subunit ribosomal RNA gene (16S) as a standard barcode for hydrozoans is subject to debate. Herein, we directly compared the barcode potential of COI and 16S in hydrozoans using 339 sequences from 47 pelagic hydrozoan species. Analysis of Kimura 2-parameter genetic distances (K2P) documented the mean intraspecific/interspecific variation for COI and 16S to be 0.004/0.204 and 0.003/0.223, respectively. An obvious "barcoding gap" was detected for all species in both markers and all individuals of a species clustered together in both the COI and 16S trees. These results suggested that the species within the studied taxa can be efficiently and accurately identified by COI and 16S. Furthermore, our results confirmed that 16S was a better phylogenetic marker for hydrozoans at the genus level, and in some cases at the family level. Considering the resolution and effectiveness for barcoding and phylogenetic analyses of Hydrozoa, we strongly recommend 16S as the standard barcode for hydrozoans.
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