Evaluation Method of Coral Reef Integrity: RMDI and Coring Rate Comparative Analysis Method

2014 ◽  
Vol 989-994 ◽  
pp. 1396-1399
Author(s):  
Jin Chao Wang ◽  
Chuan Ying Wang ◽  
Zeng Qiang Han
Keyword(s):  
Comparative Analysis ◽  
Coral Reef ◽  
South China Sea ◽  
Coral Reefs ◽  
South China ◽  
Evaluation Method ◽  
Geological Data ◽  
Analysis Method ◽  
China Sea ◽  
Borehole Camera

At present, relatively few drilling surveys have been conducted on coral reefs, and comprehensive geological info on coral reefs is difficult to obtain. However, research of coral reef is of great importance to our development and exploitation of maritime resources. The survey of South China Sea some Islands saw China’s first usage of digital borehole camera technology, which resulted in a large amount of first-hand geological data. Because the coral reef, special rock mass, integrity evaluation is very difficult, we proposed the RMDI and coring rate comparative analysis method. The evaluation method is applied to the South China Sea some Islands, and the evaluation results prove generally consistent with actual cores. The results indicate that: (1) high-resolution borehole images can provide reliable results for evaluation of coral reef integrity; (2) The RMDI and coring rate comparative analysis method is a feasible approach for the evaluation of coral reef integrity along the full or partial depth of a borehole.

scholarly journals The Status of Coral Reefs and Its Importance for Coastal Protection: A Case Study of Northeastern Hainan Island, South China Sea

2019 ◽  
Vol 11 (16) ◽  
pp. 4354 ◽  
Author(s):  
Meixia Zhao ◽  
Haiyang Zhang ◽  
Yu Zhong ◽  
Dapeng Jiang ◽  
Guohui Liu ◽  
...  
Keyword(s):  
Coral Reef ◽  
South China Sea ◽  
Coral Reefs ◽  
South China ◽  
Hainan Island ◽  
Coastal Protection ◽  
China Sea ◽  
Spatial Coverage ◽  
The Status ◽  
Coral Communities

This study evaluated the status of coral communities at the fringing reefs in the northern South China Sea, and their potential role in maintaining nearby coastline stability of northeastern Hainan Island (Puqian Bay, Hainan Bay). Thirty-nine coral species were recorded with mean coral cover of 5.3%, and are dominated by massive Galaxea, Platygyra and Porites. The coral communities were clustered into two groups (Clu-HNB and Clu-PQB) corresponding to different stable coastal conditions. Coral communities at the Hainan Bay with higher diversity and greater cover corresponded to relatively stable coastline, whereas those at the southern Puqian Bay (with the lowest coral diversity and spatial coverage) corresponded to severe coastline erosion. This work provides some direct evidence that declined coral reefs would weaken their functions to maintain a stable coastline, resulting in severe coastal erosion. It is also useful to help coastal managers and local people pay more attention to the importance of coral reefs in coastal protection and encourage them to change their ways to get sustainable use of coral reef resources. It may be beneficial to inspire or initiate coastal engineering to manage coasts with natural coral reef solution.

scholarly journals Diazotroph diversity associated with scleractinian corals and its relationships with environmental variables in the South China Sea

2019 ◽  
Author(s):  
Jiayuan Liang ◽  
Kefu Yu ◽  
Yinghui Wang ◽  
Xueyong Huang ◽  
Wen Huang ◽  
...  
Keyword(s):  
Coral Reef ◽  
South China Sea ◽  
Coral Reefs ◽  
South China ◽  
Human Activities ◽  
Environmental Variables ◽  
The South China Sea ◽  
The South ◽  
Fringing Reef ◽  
China Sea

Abstract Background: Coral reef ecosystems cannot operate normally without an effective nitrogen cycle. For oligotrophic coral reef areas, coral-associated diazotrophs are indispensable participants in the nitrogen cycle. How coral-associated diazotrophs will change in order to adapt to environmental changes resulting from global warming and human activities is a topic of concern for researchers. To this end, 68 colonies of scleractinian coral were collected from 6 coral reefs areas with different environmental variables in the South China Sea to investigate the composition of associated diazotrophs based on nifH gene amplification using high-throughput sequencing. The six coral reefs can be clearly divided into two types (fringing reefs and island reefs), are affected by varying degrees of human activities and are located at different latitudes from 9°20′06′′N to 22°34′55′′N with different seawater temperatures. Results: Alpha- and beta-diversity analyses showed that the distribution of diazotrophs among coral reefs exhibited greater geographical fluctuations than interspecific fluctuations. The predominant bacterial phyla included Proteobacteria, Chlorobi, Cyanobacteria, and two unclassified phyla. Chlorobi exhibited an abundance of 47–96% in coral samples from the high-latitude Daya Bay fringing reef affected by eutrophication. Unclassified bacteria II, with an abundance of 28–87%, was found in all coral samples from the midlatitude Luhuitou fringing reef affected by eutrophication. However, unclassified bacteria I and Proteobacteria dominated (> 80% abundance) in most of the coral samples from the Weizhou Island fringing reef, which is far from land, and three island reefs (Huangyan Island, Xinyi Reef, and Sanjiao Reef) at relatively low latitudes. At the genus level, some core diazotrophs were found in different coral sample groups. In addition, the correlation analysis with various environmental variables revealed that the variables correlated positively or negatively with different diazotrophic genera. Conclusions: We found that coral-associated diazotrophs were common among coral individuals. The presence of these diazotrophs was not affected by the external environment, but their population abundances were closely related to the different environmental variables. These results provide insights into the ecological characteristics of coral-associated diazotrophs and their relationships with critical environmental variables in the South China Sea.

Numerical Simulation for Shallow Strata Stability of Coral Reef in the Southwest of Yongshu Reef (South China Sea)

2018 ◽  
Vol 17 (4) ◽  
pp. 763-772 ◽  
Author(s):  
Qinqin Tang ◽  
Jinchang Zhang ◽  
Yingci Feng ◽  
Jian Li ◽  
Yantao Yao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coral Reef ◽  
South China Sea ◽  
South China ◽  
China Sea ◽  
Shallow Strata

scholarly journals Diversity and Characterization of Multicellular Magnetotactic Prokaryotes From Coral Reef Habitats of the Paracel Islands, South China Sea

2018 ◽  
Vol 9 ◽  
Author(s):  
Zhaojie Teng ◽  
Yuyang Zhang ◽  
Wenyan Zhang ◽  
Hongmiao Pan ◽  
Jianhong Xu ◽  
...  
Keyword(s):  
Coral Reef ◽  
South China Sea ◽  
South China ◽  
China Sea ◽  
Paracel Islands

An Inventory and Seasonal Changes in the Recent Benthic Flora of Coral Reefs of Wuzhizhou Island, Haitang Bay, South China Sea (China)

2020 ◽  
Vol 46 (6) ◽  
pp. 485-492
Author(s):  
X. B. Li ◽  
E. A. Titlyanov ◽  
T. V. Titlyanova ◽  
O. S. Belous ◽  
J. Q. Xia ◽  
...  
Keyword(s):  
South China Sea ◽  
Coral Reefs ◽  
South China ◽  
Seasonal Changes ◽  
China Sea

Crown-of-thorns starfish outbreak at Taiping Island (Itu Aba), Spratlys, South China Sea

2021 ◽  
Author(s):  
Wei Khang Heng ◽  
Ming-Jay Ho ◽  
Chao-Yang Kuo ◽  
Ya-Yi Huang ◽  
Chia-Ying Ko ◽  
...  
Keyword(s):  
South China Sea ◽  
Coral Reefs ◽  
South China ◽  
Coral Cover ◽  
Significant Decline ◽  
Live Coral ◽  
Sea Stars ◽  
China Sea ◽  
Regional Collaboration ◽  
First Time

Outbreak of crown-of-thorns sea stars, Acanthaster cf. solaris, were documented in coral reefs around Taiping Island, Spratlys for the first time. The outbreak might be thereason for the significant decline in live coral cover in 2021. Comprehensive monitoring through regional collaboration is needed.

scholarly journals Coral reef ecosystems in the South China Sea as a source of atmospheric CO2 in summer

2011 ◽  
Vol 56 (7) ◽  
pp. 676-684 ◽  
Author(s):  
HongQiang Yan ◽  
KeFu Yu ◽  
Qi Shi ◽  
YeHui Tan ◽  
HuiLing Zhang ◽  
...  
Keyword(s):  
Coral Reef ◽  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Atmospheric Co2 ◽  
The South ◽  
China Sea ◽  
Coral Reef Ecosystems
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