Genetic Structure and Haplotype Pattern of Marine Planktonic Ostracod (Porroecia spinirostris) from South China Sea Based on Mitochondrial COI Gene

2018 ◽  
Vol 54 (1) ◽  
pp. 107-116 ◽  
Author(s):  
Lei Xu ◽  
Hong Li ◽  
Lianggen Wang ◽  
Feiyan Du
Keyword(s):  
Genetic Structure ◽  
South China Sea ◽  
South China ◽  
Coi Gene ◽  
Mitochondrial Coi ◽  
China Sea ◽  
Mitochondrial Coi Gene

scholarly journals POPULATION GENETIC STRUCTURE OF SPINY LOBSTERS, Panulirus homarus AND Panulirus ornatus, IN THE INDIAN OCEAN, CORAL TRIANGLE, AND SOUTH CHINA SEA

2019 ◽  
Vol 14 (1) ◽  
pp. 7
Author(s):  
Gusti Ngurah Permana ◽  
Bedjo Slamet ◽  
Bagus Arya Permana ◽  
Ayu Krisna Dewi ◽  
Gusti Ngurah Mahardika
Keyword(s):  
Genetic Structure ◽  
Indian Ocean ◽  
South China Sea ◽  
South China ◽  
Coi Gene ◽  
Market Demand ◽  
China Sea ◽  
Equilibrium Reconstruction ◽  
Spiny Lobsters ◽  
The Indian Ocean

Populations of spiny lobsters worldwide are threatened by overfishing, while its supply from aquaculture is currently insufficient to meet the market demand. This current study investigated the genetic structure of two economically important spiny lobsters, P. homarus and P. ornatus sourced from the Indian Ocean and South China Sea. Fragments of the cytochrome oxidase subunit-I (COI) gene of the mitochondrial DNA of 71 P. homarus and 42 P. ornatus collected from 6 and 5 fish landing sites in Indonesia, respectively, were sequenced. Homologous sequences from the Indian Ocean and South China Sea available at GenBank were included in the analysis. No genetic differences were observed in P. ornatus populations from the two geographic regions (xST = -0.005) while a diminutive difference was found in the populations of P. homarus (xST = -0.002 and 0.009). These results, combined with a negative Tajima’s D estimates, points to a deficit of nucleotide variation relative to the expectations from the mutation/drift equilibrium. Reconstruction of the phylogeny of P. homarus demonstrates that all Indonesian samples of P. homarus are grouped in one cluster and share the common cluster with GenBank data originated from Taiwan, Vietnam, India, Sri Lanka, Oman, and Iran. The phylogeny of P. ornatus indicates that there are two separated lineages existing in Indonesia.

scholarly journals Threadfin Porgy (Evynnis Cardinalis) Haplotype Pattern and Genetic Structure in Beibu Gulf, South China Sea

2021 ◽  
Vol 9 ◽  
Author(s):  
Lei Xu ◽  
Xuehui Wang ◽  
Lianggen Wang ◽  
Jiajia Ning ◽  
Yafang Li ◽  
...  
Keyword(s):  
Genetic Structure ◽  
South China Sea ◽  
South China ◽  
Mismatch Distribution ◽  
Coi Gene ◽  
Beibu Gulf ◽  
Demographic Expansion ◽  
Homogeneous Population ◽  
China Sea ◽  
Population Demographic

Threadfin porgy (Evynnis cardinalis) is one of the important commercial fishing targets of bottom trawl fishery in the northern South China Sea. It is mainly threatened by overexploitation and listed as endangered species in the IUCN Red List. To investigate the demographic history and genetic structure of E. cardinalis population, partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene were obtained from 162 individuals collected from Beibu Gulf, South China Sea. In total, 44 different haplotypes were identified, and the dominant haplotype was found in all sampling sites. Across the dataset, nucleotide diversity was low, whereas haplotype diversity was high. Low pairwise comparisons of ΦST and high gene flow among sampling sites revealed a genetically homogeneous population structure in Beibu Gulf, indicating a single panmictic stock of E. cardinalis in this area. The star-like haplotype network, unimodal mismatch distribution, and significantly negative Tajima’s D and Fu’s Fs values indicated recent population demographic expansion of E. cardinalis. The mismatch distribution and Bayesian skyline plot results indicated that E. cardinalis from Beibu Gulf might have experienced colonization and demographic expansion due to sea level fluctuations during the late Pleistocene.

Enigmaticolus inflatus sp. nov., a new buccinid species from a methane seep area in the South China Sea (Gastropoda: Neogastropoda)

Zootaxa ◽  
2020 ◽  
Vol 4728 (3) ◽  
pp. 385-389 ◽  
Author(s):  
SHUQIAN ZHANG ◽  
SUPING ZHANG ◽  
HAO CHEN
Keyword(s):  
South China Sea ◽  
South China ◽  
Gross Anatomy ◽  
The South China Sea ◽  
Coi Gene ◽  
Shell Shape ◽  
Methane Seep ◽  
The South ◽  
China Sea ◽  
C Subunit

During an investigation carried out by the Institute of Oceanology, Chinese Academy of Sciences (IOCAS), two living buccinid specimens were collected from a deep-sea methane seep area in the South China Sea. Observations of the shell, gross anatomy and radular morphology reveal that they represent an undescribed species of the genus Enigmaticolus. In this paper, we describe and illustrate this species as Enigmaticolus inflatus sp. nov. The new species is by general shell shape most similar to Enigmaticolus marshalli Fraussen & Stahlschmidt, 2016 from Kermadec Ridge, New Zealand, but can be distinguished from it by having an inflated shell with reduced spiral sculpture, and by the absence of axial sculpture. Phylogenetic analysis using 636 bp of the cytochrome oxidase c subunit I (COI) gene also supports its systematic placement within Enigmaticolus. 

Integrative taxonomy of enigmatic deep-sea true whelks in the sister-genera Enigmaticolus and Thermosipho (Gastropoda: Buccinidae)

2020 ◽  
Author(s):  
Chong Chen ◽  
Ting Xu ◽  
Koen Fraussen ◽  
Jian-Wen Qiu
Keyword(s):  
South China Sea ◽  
South China ◽  
Okinawa Trough ◽  
Morphological Variability ◽  
The South China Sea ◽  
Coi Gene ◽  
The South ◽  
China Sea ◽  
The Okinawa Trough ◽  
New Findings

Abstract Whelks in the sister-genera Enigmaticolus and Thermosipho (Gastropoda: Buccinidae) commonly inhabit deep-water hydrothermal vents and hydrocarbon seeps. Thermosipho desbruyeresi, originally described from the Lau Basin, was thought to occur in vents across the western Pacific, with Eosipho desbruyeresi nipponensis described from the Okinawa Trough treated as its junior synonym. However, new material collected from vents in the Okinawa Trough and seeps in the South China Sea exhibit key characteristics of Enigmaticolus. Re-examination of the types revealed that Eosipho d. nipponensis is actually morphologically distinct from Thermosipho desbruyeresi. A molecular phylogeny reconstructed using the cytochrome c oxidase subunit I (COI) gene confirmed the placement of both taxa in Enigmaticolus and supported their distinctiveness at the species level. We, therefore, rehabilitate E. d. nipponensis as Enigmaticolus nipponensis comb. nov. and transfer T. desbruyeresi to the same genus, as Enigmaticolus desbruyeresi comb. nov. Our results also revealed that Enigmaticolus monnieri described from east Africa and E. inflatus described from the South China Sea are in fact conspecific with E. nipponensis. We discuss the distribution and biogeography, as well as morphological variability, of Enigmaticolus in the light of these new findings. Thermosipho is then left with only its type species, T. auzendei from the East Pacific vents. We have revised the diagnosis for the two genera, as well as the species included in them.

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