Microlaimus capitatus sp. n. and Dichromadora simplex Timm, 1961 (Nematoda, Chromadorea) from the coast of Vietnam

Zootaxa ◽  
2020 ◽  
Vol 4732 (2) ◽  
pp. 323-331
Author(s):  
VLADIMIR G. GAGARIN
Keyword(s):  
South China Sea ◽  
South China ◽  
Littoral Zone ◽  
Nematode Species ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Coast Of Vietnam ◽  
First Time

Two nematode species isolated from sediments of the littoral zone of the South China Sea on the coast of Vietnam are described and illustrated. Microlaimus capitatus sp. n. is closely related to M. affinis Gerlach, 1958 and M. amphidius Kamran et al., 2009, but differs by having a thin, poorly developed pharyngostom, more posterior vulva and presence of terminal setae on the tail. The female of Dichromadora simplex Timm, 1961 is described and illustrated for the first time. 

scholarly journals Gracilaria phuquocensis sp. nov., a new flattened Gracilaria species (Gracilariales, Rhodophyta), previously recognized as G. mammillaris, from the southern coast of Vietnam

2020 ◽  
Author(s):  
HN Le ◽  
N Muangmai ◽  
S Kheauthong ◽  
Z Sun ◽  
Giuseppe Zuccarello
Keyword(s):  
New Species ◽  
South China Sea ◽  
South China ◽  
Taxonomic Status ◽  
Molecular Data ◽  
The South China Sea ◽  
The South ◽  
Western Atlantic ◽  
China Sea ◽  
Coast Of Vietnam

© 2019 Japanese Society of Phycology Flattened Gracilaria species are widely distributed along the coasts of the South China Sea with more than 20 species recorded. Within the South China Sea, Gracilaria mammillaris has only been reported from Vietnam, but this species is likely restricted to the western Atlantic. This study aimed to reevaluate the taxonomic status of Vietnamese specimens of ‘G. mammillaris’ using combined morphological and molecular data. Our data clearly indicated that Vietnamese specimens were morphologically and genetically distinct from authentic G. mammillaris from the western Atlantic, and also other described flat Gracilaria species. We, therefore, propose that specimens from Vietnam originally identified as G. mammillaris be designated as a new species, Gracilaria phuquocensis sp. nov. Morphologically, G. phuquocensis can be distinguished from other flat Gracilaria species by its small thallus size, narrower blades, many medullary layers, abundant basal nutritive filaments within mature cystocarps, and tetrasporangial nemathecium. Our rbcL sequence analyses showed that the new species was sister to Gracilaria rhodymenioides from Thailand, and these two species formed a clade with cylindrical Gracilaria species. Our study contributes to clarification of the taxonomic status of misidentified specimens attributed to the flattened Gracilaria species in the South China Sea.

scholarly journals Gracilaria phuquocensis sp. nov., a new flattened Gracilaria species (Gracilariales, Rhodophyta), previously recognized as G. mammillaris, from the southern coast of Vietnam

2020 ◽  
Author(s):  
HN Le ◽  
N Muangmai ◽  
S Kheauthong ◽  
Z Sun ◽  
Giuseppe Zuccarello
Keyword(s):  
New Species ◽  
South China Sea ◽  
South China ◽  
Taxonomic Status ◽  
Molecular Data ◽  
The South China Sea ◽  
The South ◽  
Western Atlantic ◽  
China Sea ◽  
Coast Of Vietnam

© 2019 Japanese Society of Phycology Flattened Gracilaria species are widely distributed along the coasts of the South China Sea with more than 20 species recorded. Within the South China Sea, Gracilaria mammillaris has only been reported from Vietnam, but this species is likely restricted to the western Atlantic. This study aimed to reevaluate the taxonomic status of Vietnamese specimens of ‘G. mammillaris’ using combined morphological and molecular data. Our data clearly indicated that Vietnamese specimens were morphologically and genetically distinct from authentic G. mammillaris from the western Atlantic, and also other described flat Gracilaria species. We, therefore, propose that specimens from Vietnam originally identified as G. mammillaris be designated as a new species, Gracilaria phuquocensis sp. nov. Morphologically, G. phuquocensis can be distinguished from other flat Gracilaria species by its small thallus size, narrower blades, many medullary layers, abundant basal nutritive filaments within mature cystocarps, and tetrasporangial nemathecium. Our rbcL sequence analyses showed that the new species was sister to Gracilaria rhodymenioides from Thailand, and these two species formed a clade with cylindrical Gracilaria species. Our study contributes to clarification of the taxonomic status of misidentified specimens attributed to the flattened Gracilaria species in the South China Sea.

Recent brachiopods from the South China Sea, NW Pacific

Zootaxa ◽  
2017 ◽  
Vol 4306 (2) ◽  
pp. 287 ◽  
Author(s):  
MARIA ALEKSANDRA BITNER ◽  
MARCO ROMANIN
Keyword(s):  
South China Sea ◽  
Northern Hemisphere ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
The West ◽  
West Pacific ◽  
China Sea ◽  
Recent Brachiopods ◽  
First Time

Three articulated brachiopod species have been recognized in material collected during the 2014 French-Taiwanese cruise DongSha to the South China Sea, NW Pacific: Terebratulina japonica (Sowerby, 1846), Macandrevia sp. and Nipponithyris afra Cooper, 1973. Nipponithyris afra is noted for the first time from the Northern Hemisphere and the genus Macandrevia is reported for the first time from the West Pacific. All species are reported for the first time from the South China Sea, extending their biogeographical range. 

scholarly journals The Philippines and Vietnam’s Responses to the Permanent Court of Arbitration’s Final Award on the Arbitration Case Initiated by the Philippines Against China over the South China Sea (July 2016)

2019 ◽  
Vol 11 (1) ◽  
pp. 155-178
Author(s):  
Nguyen Huong Thach Thao
Keyword(s):  
Foreign Policy ◽  
South China Sea ◽  
Comparative Study ◽  
South China ◽  
The Philippines ◽  
International Community ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
First Time

Abstract In July 2016, the Permanent Court of Arbitration (PCA) issued its final award on the South China Sea dispute between the Philippines and China that caught the attention of the international community. Since this was the first time that a claimant in the South China Sea had ever referred the case to an international juridical body in an effort to settle the dispute, the responses of both claimant and non-claimant stakeholders were awaited. Realising the relevance of the issue, I conduct a comparative study of the responses to the PCA’s final award to two major claimants with similar positions on the South China Sea—the Philippines and Vietnam. The main aim of this study is to indicate the similarities and/or differences in the way these two states responded to the final decisions of the PCA. The study finds that even though both the Philippines and Vietnam reacted to the award in a similar manner, the motives behind their responses were different. In general, the South China Sea policy of the Philippines has always been less consistent than that of Vietnam, which can be explained through each state’s foreign policy tendencies.

scholarly journals Integrated Russian-Vietnamese geological-geophysical and oceanographic expedition in the South China Sea (R/V “Akademik M.A. Lavrentyev”, cruise 88, 2019)

2020 ◽  
Author(s):  
Р.Б. ШАКИРОВ ◽  
Н.С. ЛИ ◽  
А.И. ОБЖИРОВ ◽  
М.Г. ВАЛИТОВ ◽  
В.Т. СЪЕДИН ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Oil And Gas ◽  
The South China Sea ◽  
New Mineral ◽  
The South ◽  
China Sea ◽  
Hydrological Structure ◽  
Iron Manganese ◽  
First Time

В ноябре 2019 г. в Южно-Китайском море (исключительная экономическая зона СРВ) впервые за последние 30 лет была проведена крупная комплексная геолого-геофизическая совместная экспедиция ТОИ ДВО РАН и Вьетнамской академии наук и технологий (88-й рейс НИС «Академик М.А. Лаврентьев»). Области изучения – геофизика, геология, гидроакустика, газогеохимия, гидрооптика, геомикробиология, палеогеография и гидрология. В толще вод и донных отложениях впервые обнаружены газогеохимические аномалии, сравнимые с аномалиями над нефтегазоносным шельфом о-ва Сахалин. Впервые в районе исследований выявлены геомикробиологические индикаторы углеводородных скоплений. Уточнены рельеф, геофизические поля, гидрологическая структура, особенности седиментации, палеогеографии и минералогии континентального шельфа Вьетнама и прилегающих глубоководных бассейнов. Предложено выделить тонкодисперсные карбонатно-глинистые осадочные отложения в самостоятельный минеральный ресурс. Выявлены районы, перспективные для поисков новых залежей нефти и газа, газогидратов, скоплений железо-марганцевых образований и др. Более 70 % научного состава экспедиции составляли молодые ученые. In November 2019, for the first time in 30 years, an integrated geological and geophysical joint expedition of the POI FEB RAS and the Vietnamese Academy of Science and Technology was carried out in the South China Sea (EEZ Vietnam) (88 cruise of the R/V “Akademik M.A. Lavrent’yev”). The set of methods consisted of geophysics, geology, hydroacoustics, gasgeochemistry, hydrooptics, geomicrobiology, paleogeography and hydrology. Gasgeochemical anomalies were found in the water column and bottom sediments, comparable with the anomalies over the oil and gas deposits along the Sea of Okhotsk shelf of Sakhalin Island. For the first time in the study area, deep water geomicrobiological indicators of hydrocarbon accumulations have been identified. The relief, geophysical fields, hydrological structure, features of sedimentation, paleogeography and mineralogy of the continental shelf of Vietnam and the adjacent deep sea basins are refined. Finely dispersed carbonate-clay sediments were proposed as a new mineral resource. Areas that are promising for the search for new deposits of oil and gas, gashydrates, accumulations of iron-manganese formations, and others are identified. Young scientists occupied more than 60 % of the scientific expedition staff.

scholarly journals Characterization of the micro-contaminants from the inner-body of Kraak porcelain excavated from the “Nan’ao I” shipwreck, the South China Sea

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Jingnan Du ◽  
Wugan Luo ◽  
Naisheng Li ◽  
Changsui Wang
Keyword(s):  
South China Sea ◽  
Corrosion Product ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Phase Transition Pressure ◽  
Ft Ir ◽  
First Time ◽  
Kraak Porcelain

Abstract In this paper, optical microscopy, SEM–EDS, Raman and FT-IR analyses were used to investigate different types of corrosion product between layers of glaze and body of Kraak porcelain objects that were excavated from “Nan’ao I” shipwreck, the South China Sea. Several contaminants including NaCl, CaSO4·2H2O, FeOOH and FeS2, were found in many of the pores and cracks of the porcelain objects from Jingdezhen Kiln and Zhangzhou Kiln, even after conservation. While compared with the sample of Jingdezhen Kiln, the contaminants in the sample of Zhangzhou Kilns much more severely. The research pointed out that these contaminants were formed due to the marine environment influence and cross-contamination with other metal relics located in the shipwreck, and more contaminants formed in porous structure, hence reduce the porcelain quality. As regards to conservation, the fragility of ceramic objects from underwater contexts are likely to be caused by various kinds of insoluble ferrous salts and its phase transition pressure. Previous studies on this kind of remains tend to focus on the macro-insoluble salts on the enamel surface. In this paper, preliminary investigations were performed for the first time on different kinds of inner micro-corrosion product in China.

scholarly journals Geological features for the formation of gas-geochemical fields, including helium and hydrogen, in the water and sediments at the Vietnamese part of the South-China Sea

Georesursy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 132-142
Author(s):  
Nadezhda S. Syrbu ◽  
Do Huy Kyong
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Marine Geology ◽  
The South ◽  
China Sea ◽  
Marine Geology And Geophysics ◽  
Academy Of Sciences ◽  
Far Eastern ◽  
First Time

The paper presents the results of a complex joint Russian-Vietnamese geological, geophysical and oceanographic expedition in the South-China Sea (R/V “Akademik M.A. Lavrentyev”, cruise 88, 2019), as well as related joint Russian-Vietnamese marine and land researches in the area of north and south Vietnam under a series of local FEB RAS – VAST grants. The organizers of the marine expedition are the V. I. Ilyichev Pacific Oceanological Institute of the Far Eastern Branch of the Russian Academy of Sciences (POI FEB RAS) and the Institute of Marine Geology and Geophysics of the Vietnam Academy of Science and Technology (IMGG VAST). In comparison with the Sea of Japan and the Sea of Okhotsk, it can be noted that the active bottom degassing on the on the Vietnamese shelf and slope have is a local, although the intensity of gas-geochemical anomalies is comparable to similar zones in the Far Eastern Seas. For the first time, anomalous methane fields (up to 5000 nl/l) were found in the water column of the South-China Sea, which are comparable to anomalies on the oil and gas shelf and the gas-hydrate-bearing slope of Sakhalin Island. Metamorphosed sedimentary and volcanic rocks were discovered for the first time in the southern part of Catba Island (Gulf of Tonkin), which indicates the introduction of an endogenous body into the sedimentary strata and its further transformation. In connection with the discovery in 2020 of the large Ken Bau gas field at the southern end of the sedimentary basin of the Red River, the forecast of POI scientists about the presence of significant hydrocarbon reserves in this area was confirmed. The work was carried out within the framework of the joint Vietnam-Russia Laboratory for Marine Sciences and Technology (V. I. Ilyichev Pacific Oceanological Institute of the Far Eastern Branch of the Russian Academy of Sciences and the Institute of Marine Geology and Geophysics Vietnam Academy of Science and Technology). The expedition of the R/V “Akademik M.A. Lavrentyev” (cruise 88) is part of a series of expeditions in accordance with the UN Decade dedicated to the Ocean Science for Sustainable Development.

scholarly journals Three-Dimensional Distribution of Turbulent Mixing in the South China Sea

2016 ◽  
Vol 46 (3) ◽  
pp. 769-788 ◽  
Author(s):  
Qingxuan Yang ◽  
Wei Zhao ◽  
Xinfeng Liang ◽  
Jiwei Tian
Keyword(s):  
South China Sea ◽  
South China ◽  
Turbulent Mixing ◽  
Three Dimensional ◽  
Internal Tide ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Dimensional Distribution ◽  
First Time

AbstractA three-dimensional distribution of turbulent mixing in the South China Sea (SCS) is obtained for the first time, using the Gregg–Henyey–Polzin parameterization and hydrographic observations from 2005 to 2012. Results indicate that turbulent mixing generally increases with depth in the SCS, reaching the order of 10−2 m2 s−1 at depth. In the horizontal direction, turbulence is more active in the northern SCS than in the south and is more active in the east than the west. Two mixing “hotspots” are identified in the bottom water of the Luzon Strait and Zhongsha Island Chain area, where diapycnal diffusivity values are around 3 × 10−2 m2 s−1. Potential mechanisms responsible for these spatial patterns are discussed, which include internal tide, bottom bathymetry, and near-inertial energy.

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