Assessment of Sea Water Quality in some Limestone Island and Archipelagos areas, Viet Nam

Trang, Cao Thị Thu; Thung, Đỗ Công; Nam, Le Van; Kha, Pham Thi; Van, Bach Nguyen; Ngoc, Dinh Hai

doi:10.25073/2588-1094/vnuees.4556

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The coastal areas of Ha Long Bay (Vietnam) and North Sulawesi (Indonesia) comprise a wide assortment of environments, including shallow salty to brackish lakes, lagoons and mangroves, and deeper coral reefs, rocky bottoms, sandy beds, and plant or algal meadows [37,38]. Such heterogeneous habitat availability can be a driver of new species radiation, forcing organisms to acclimatize and diversify across a variety of ecological niches [39].…”

Section: Discussionmentioning

confidence: 99%

New Insight into the Genus Cladocroce (Porifera, Demospongiae) Based on Morphological and Molecular Data, with the Description of Two New Species

Bertolino

Cerrano

Bavestrello

et al. 2023

JMSE

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During scientific expeditions in Indonesia and Vietnam, several sponge specimens belonging to the genus Cladocroce were collected. The integration of morphological and molecular analyses, incorporating species delimitation models (ABGD, ASAP, and bPTP) and phylogenetic approaches using three molecular markers (COI, 28S, and 18S–ITS1–5.8S–ITS2–28S), allowed us to discriminate three congeneric species. Two of these species (C. burapha and C. pansinii sp. nov.) were supported by morphological and molecular data, whereas a third species (C. lamellata sp. nov.) was delimited by morphological data only. We formally describe two new species, C. pansinii sp. nov. and C. lamellata sp. nov. C. aculeata is a newly recorded species for Indonesia and the first documented finding after the original description. The re-examination of the type material of C. burapha, and indirectly the molecular approach, allowed us to confirm that C. burapha lives in sympatry with C. pansinii sp. nov. in Vietnam and with C. lamellata in Indonesia. Thanks to these findings, we relocated the paratype of C. burapha to the new species described here, i.e., C. pansinii sp. nov.

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Section: Discussionmentioning

confidence: 99%

New Insight into the Genus Cladocroce (Porifera, Demospongiae) Based on Morphological and Molecular Data, with the Description of Two New Species

Bertolino

Cerrano

Bavestrello

et al. 2023

JMSE

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show abstract

“…Các nghiên cứu gần đây về chất lượng nước ven bờ quanh đảo Cát Bà cho thấy có biểu hiện ô nhiễm do hoạt động nuôi trồng thủy sản và một phần từ lục địa [1], hàm lượng một số kim loại nặng, hóa chất bảo vệ thực vật trong nước ven bờ Cát Bà cao hơn so với Hạ Long, Bái Tử Long phản ánh tác động từ lục địa tới ven bờ Cát Bà lớn hơn các vùng khác [2]. Ở phía Bắc và phía Tây Bắc của quần đảo Cát Bà được cung cấp trầm tích hệ thống sông Bạch Đằng nên tốc độ lắng đọng trầm tích tăng nhanh hơn so với các vùng giữa vịnh Hạ Long và rìa ngoài do khu vực này ít nhận được nguồn trầm tích từ đất liền chuyển ra.…”

Section: Mở đầUunclassified

Major Characteristics of Surface Sediments Within the Shallow Water of the Cat Ba Island, North Vietnam

Hoàng¹,

Vuong²,

Egidarev³

et al. 2020

EES

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The Cat Ba is one of the largest Islands offshore North Vietnam, which is characterized by an abundance of coral reefs in the East and Southeast of the island. The surface sediments are considered the basic elements for the coral ecosystem development. In this study, the authors present some new results studying pH, Eh, mineral composition, and grain size as the basic information for environmental assessment of this area. The results show that the pH value of the surface sediment varies from 6.90 to 8.09, with an average of 7.24 while the Eh value of the sediment ranges from -121.10 to -48.20mV, an average of -68.39mV, demonstrating a reducing environment. The surface sediments have been classified into 8 size classes: the coarse silt > very coarse silt > medium sand, very fine sand > very coarse sand, fine sand > coarse sand, very fine gravel. Most of the sediments are poorly sorted - very poorly sorted, only a few sedimentary samples are well sorted, moderately sorted, and moderately well sorted. The average mineral composition of the surface sediments consists of: 25% quartz, 17% illite, 16% aragonite, 13% kaolinite, 10% calcite, 5% chlorite, 4% gothite, 3% halite, 2% feldspar and less montmorillonite, and dolomite. These results allowed the researcher to interpret that the sediments have been deposited in a relatively calm environment and the terrigenous sediment sources are dominant over the marine sources. Source marine sediment groups are characterized by coarse grains, high pH, and are rich in carbonate minerals, which have been produced by biological materials. In contrast, the terrigenous sediment group is dominated by fine-grained sediments, rich clay minerals, quartz, and gothite. These fine-grained sediments are commonly distributed in the area and are favorable places for pollutant accumulation.

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Environmental Radioactivity in the Marine Environment of Ha Long Bay, North Vietnam, and Biomagnification of Polonium

et al. 2021

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Assessment of Sea Water Quality in some Limestone Island and Archipelagos areas, Viet Nam

Cited by 5 publications

References 2 publications

New Insight into the Genus Cladocroce (Porifera, Demospongiae) Based on Morphological and Molecular Data, with the Description of Two New Species

New Insight into the Genus Cladocroce (Porifera, Demospongiae) Based on Morphological and Molecular Data, with the Description of Two New Species

Major Characteristics of Surface Sediments Within the Shallow Water of the Cat Ba Island, North Vietnam

Environmental Radioactivity in the Marine Environment of Ha Long Bay, North Vietnam, and Biomagnification of Polonium

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