scholarly journals Characterizing the spatial distribution of coral reefs in the South-Central Coast region of Viet Nam using Planetscope imagery

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12413
Author(s):  
Khanh V. Nguyen ◽  
Vinh C. Duong ◽  
Kinh T. Kieu ◽  
Thuong V. Tran ◽  
Cho-ying Huang ◽  
...  

This study aims to understand the spatial distribution of coral reefs in the central region of Viet Nam. We classified live coral cover in Son Tra Peninsula (ST) and Cu Lao Cham Island (CLC) in the South-Central Coast Region of Viet Nam using the Maximum Likelihood Classifier on 3 m Planetscope imagery. Confusion matrices and the accuracy of the classifier were assessed using field data (1,543 and 1,560 photographs in ST and CLC, respectively). The results showed that the reef’s width ranged from 30 to 300 m across the study site, and we were able to detect live coral cover across a depth gradient of 2 to 6 m below the sea surface. The overall accuracies of the classifier (the Kappa coefficient) were 76.78% (0.76) and 78.08% (0.78) for ST and CLC, respectively. We found that 60.25% of coral reefs in ST were unhealthy and the live coral cover was less than 50%, while 25.75% and 11.46% of those in CLC were in good and excellent conditions, respectively. This study demonstrates the feasibility of utilizing Planetscope imagery to monitor shallow coral reefs of small islands at a high spatial resolution of 3 m. The results of this study provide valuable information for coral reef protection and conservation.

2021 ◽  
Author(s):  
◽  
Thi Phuong Lan Nguyen

<p>The tourism industry of Viet Nam has developed rapidly over the last two decades. However, more attention must be given to destination marketing, especially joint destination marketing, if the sector is to continue to expand. To date there has been little research on joint destination marketing, especially in developing countries and transitional economies like Viet Nam. This study attempts to fulfil this gap by examining the joint destination marketing activities of the eight South Central Coast provinces of Viet Nam. The study has three objectives: (1) to examine the nature and extent of current joint destination marketing activities, (2) to analyze the factors that influence joint destination marketing decision-making, and (3) to investigate the destination marketing relationships between local destination marketing organizations(DMOs) of the eight provinces.  The South Central Coast was chosen as the study site as it is the most dynamic tourism development region of Viet Nam. The study triangulated both primary and secondary data. The primary data was collected mainly from semi-structured in-depth interviews with DMO representatives. This was complemented by the content analysis of official tourism websites.  Four sets of key findings result from this research. First, the South Central Coast provinces currently conduct destination marketing more individually than jointly. However, all provinces of the region practise a certain mix of both individual and joint marketing activities. Local DMOs also develop competitive and cooperative relationships with other counterpart DMOs. Second, joint destination marketing is an emerging and increasingly common trend in the region and is characterized by different patterns of cooperative behaviour and levels of involvement. Third, joint destination marketing decision-making is influenced by various factors, including preconditions, benefits, drawbacks, motives and barriers. These factors are inter-related, which in turn creates tensions for DMO in their joint destination marketing decision-making. Fourth, in the South Central Coast region, joint destination marketing activities occur more commonly at a sub-regional scale than at the scale of the whole region. Furthermore, these sub-region cooperative models involve provinces located in other regions. Decisive factors in destination marketing partnership formation include proximity, convenient transportation, mutual benefits, similar target markets and compatibility of tourism products.  The study concludes by highlighting the need to establish a regional tourism coordinating organization to facilitate joint actions and cooperative interrelationships between provinces. There is also much room left in for further joint destination marketing research.</p>


2021 ◽  
Author(s):  
◽  
Thi Phuong Lan Nguyen

<p>The tourism industry of Viet Nam has developed rapidly over the last two decades. However, more attention must be given to destination marketing, especially joint destination marketing, if the sector is to continue to expand. To date there has been little research on joint destination marketing, especially in developing countries and transitional economies like Viet Nam. This study attempts to fulfil this gap by examining the joint destination marketing activities of the eight South Central Coast provinces of Viet Nam. The study has three objectives: (1) to examine the nature and extent of current joint destination marketing activities, (2) to analyze the factors that influence joint destination marketing decision-making, and (3) to investigate the destination marketing relationships between local destination marketing organizations(DMOs) of the eight provinces.  The South Central Coast was chosen as the study site as it is the most dynamic tourism development region of Viet Nam. The study triangulated both primary and secondary data. The primary data was collected mainly from semi-structured in-depth interviews with DMO representatives. This was complemented by the content analysis of official tourism websites.  Four sets of key findings result from this research. First, the South Central Coast provinces currently conduct destination marketing more individually than jointly. However, all provinces of the region practise a certain mix of both individual and joint marketing activities. Local DMOs also develop competitive and cooperative relationships with other counterpart DMOs. Second, joint destination marketing is an emerging and increasingly common trend in the region and is characterized by different patterns of cooperative behaviour and levels of involvement. Third, joint destination marketing decision-making is influenced by various factors, including preconditions, benefits, drawbacks, motives and barriers. These factors are inter-related, which in turn creates tensions for DMO in their joint destination marketing decision-making. Fourth, in the South Central Coast region, joint destination marketing activities occur more commonly at a sub-regional scale than at the scale of the whole region. Furthermore, these sub-region cooperative models involve provinces located in other regions. Decisive factors in destination marketing partnership formation include proximity, convenient transportation, mutual benefits, similar target markets and compatibility of tourism products.  The study concludes by highlighting the need to establish a regional tourism coordinating organization to facilitate joint actions and cooperative interrelationships between provinces. There is also much room left in for further joint destination marketing research.</p>


2021 ◽  
Vol 324 ◽  
pp. 03007
Author(s):  
Ni Wayan Purnama Sari ◽  
Rikoh Manogar Siringoringo ◽  
Muhammad Abrar ◽  
Risandi Dwirama Putra ◽  
Raden Sutiadi ◽  
...  

Observations of the condition of coral reefs have been carried out in Spermonde waters from 2015 to 2018. The method used in this observation uses Underwater Photo Transect (UPT), and the data obtained is analyzed using CPCe (Coral Point Count with Excel Extensions) software. The results show that the percentage of coral cover has increased from year to year. The percentage of live coral cover in 2015 was 19.64%, 23.60 in 2016, 23.72% in 2017, and 27.83% in 2018. The increase in live coral cover from year to year is thought to occur due to the availability of nutrients. or increasing public awareness, considering this location is one of the most famous tourist attractions in Makassar. Coral reef health index values can be used to classify coral reef health. Through the analysis of the coral reef health index, an index value of 4 was obtained, which means that the condition of the coral reefs is in the “moderate” category.


2018 ◽  
Vol 66 (1-1) ◽  
pp. 280 ◽  
Author(s):  
Juan José Alvarado ◽  
Andrés Beita-Jiménez ◽  
Sebastián Mena ◽  
Cindy Fernández ◽  
Jorge Cortés ◽  
...  

Abstract: When conservation can keep up with development´s pace: Health status of coral ecosystems in the North Pacific of Costa Rica. Coral reefs are diverse and productive ecosystems, despite this, they are being threatened by human activities that enhance the detrimental impact of the natural phenomenon’s like Harmful Algal Blooms (HAB). The north Pacific of Costa Rica has been characterized as one of the best regions for the coral reefs development in the country. However, many of these ecosystems are being lost as a result of eutrophication, overfishing, invasive species and others impacts that affect the region. In the present study, live coral cover in the north Pacific was 5.0 ± 10.4(s.d.) %, with a domination in the ecosystems by turf algae. Twenty-six invertebrate taxa were registered in the region with the predominance of the sea urchin Diadema mexicanum. Ninety-four species of reef fish were identified. Snappers and some planktivores species were the groups with the highest frequency and abundance. The localities previously studied in the 1990 decade, presented a mean live coral cover between 40-50 %, whereby the actual state of the reef reflect a significant deterioration. This decline in coral cover is due to natural events like the El Niño, as well as the decrease in water quality in the region. In recent years, proliferations of the invasive seaweed Caulerpa sertularioides and high densities of bioerosive sea urchins have been reported, mainly associated with HAB events. Likewise, fish communities have low biomass, especially in the vicinity of fishing villages. The state of the reefs in the North Pacific is worrying and requires actions for its recovery and conservation, for which there must be better planning of the development of projects and activities on the coast. Rev. Biol. Trop. 66(Suppl. 1): S280-S308. Epub 2018 April 01. 


Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4309
Author(s):  
Rongyong Huang ◽  
Huiya Zhang ◽  
Kefu Yu

Coral reefs are important as they can help to maintain ecological balance, biological resources, and species diversity on earth. However, they are globally threatened by human activities and climate change. As live coral cover (LCC) is regarded as an important measure of the health of coral reefs, analysis on LCC change associated with environmental parameters, such as chlorophyll-a concentration (Chl-a), sea surface temperature (SST), and photosynthetically active radiation (PAR), is of great value. Research on this front would help us comprehend the changes in coral reefs induced by human activities and global changes. Instead of using spasmodically in-field-measured environmental parameters, in this study, we chose to combine the successive Chl-a, SST, and PAR products of the Moderate Resolution Imaging Spectroradiometer (MODIS) with historic LCC records to establish an empirical relationship using nonlinear optimization. Thereafter, the established relationship was further used to discuss some possible developments of LCCs. According to the experiments, we concluded that the degradation of the LCC around Weizhou Island may be mainly caused by human-activity-caused eutrophication. Besides, we also showed that even if the Chl-a and the PAR can keep constant with current average levels, the corals around Weizhou Island may still be in a risk of disappearing between 2120–2140 as the SST continues to rise.


2004 ◽  
Vol 31 (2) ◽  
pp. 111-121 ◽  
Author(s):  
HECTOR M. GUZMAN ◽  
CARLOS A. GUEVARA ◽  
ODALISCA BREEDY

Sampling scale and lack of attention to taxa other than scleractinian corals have limited the capacity to protect coral reefs and coral communities in Pacific Panama. The distribution of coral habitats (live coral cover) and their species richness in the largest marine protected area of Panama, the Coiba National Park (270 125 ha), is described using quadrat transects and manta tows. The species richness of scleractinian corals and octocorals was lower in coral reefs than in coral communities, and a close relationship between richness and live coral cover was observed only in coral communities. The distribution of high live coral cover in coral communities overlapped with areas of high coral species richness. Average live coral cover in communities was 64%, compared to 28% in reefs, whereas algae cover was 30% and 49%, respectively. Twenty-two coral and 34 octocoral species were observed, many only now detected in Panama as endemic or new species. Analysis of satellite imagery showed 80% of terrestrial habitats were mostly primary forest, and coral reefs and coral communities covered 1700 ha, about 2% of marine habitats. Shallow marine environments (< 20 m) had up to 60% calcareous red algae cover (rhodolite beds). Based on the distribution of live coral cover and species richness, three conservation units were identified as priority, with the southern and northernmost sides of the marine protected area as the most significant. These three areas encompass most of the rare and endemic species or populations, as well as species previously regarded as endangered.


2020 ◽  
Vol 5 (4) ◽  
Author(s):  
Nguyen Thi Quyet

<p>Located in the middle position of the country, all provinces/cities in the South Central Coast border the sea. With a total coastline length of 1,430 km, accounting for 43.8% of the whole country's coastline (3,260 km), the sea and island tourism in the South Central Coast is now considered a spearhead economic sector, which plays an important role in socio-economic development of this area. In this article, the authors have deeply analyzed the situation and the issues in developing the sea and island tourism in the South Central Coast region from 2010 up to now. Thence, findings lead to important practical suggestions to promote the sustainable development of the sea and island tourism in the South Central Coast in the coming time.</p><p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0616/a.php" alt="Hit counter" /></p>


2020 ◽  
Vol 24 (1) ◽  
pp. 71-80
Author(s):  
Suparno Suparno ◽  
Yempita Efendi ◽  
Arlius Arlius ◽  
Mas Eriza ◽  
Bukhari Bukhari ◽  
...  

Coral reefs condition in the protected marine area at Selat Bunga has decreased every year.  The health of coral reefs is represented by coral index health. The purpose of this study was to analyze the coral reefs health index based on the condition of live coral cover, resilience level and condition of coral fish. Retrieval of coral reefs data using the Under Photo Transect Method and coral fish data collection using the Under Water Visual Census. The results of research at 9 research stations found that the average cover of live coral ranged from 1.40 - 44.68%, fleshy seaweed ranged from 0.13% - 12.87%, rubble ranged from 1.73 - 39.40%, and average total reef fish biomass ranged from 8.93 - 253.23 kg/ha. Coral reef health index values range between 3-6. Coral reefs health index of 67% of research stations is 3. The coral health index value 3 is indicated by a low percent live coral cover, a high resilience rate, and a low reef fish biomass.Kondisi terumbu karang di Kawasan Konservasi Taman Wisata Perairan (TWP) Selat Bunga Laut  telah mengalami penurunan setiap tahun.  Indeks kesehatan karang adalah nilai yang mengambarkan kesehatan karang antar lokasi penelitian. Tujuan penelitian ini adalah menganalisis indeks kesehatan terumbu karang berdasarkan kondisi tutupan karang hidup,  tingkat resiliensi dan kondisi ikan karang.  Pengambilan data terumbu karang dengan metode Under Photo Transect dan pengambilan data ikan karang mengunakan Under Water Visual Census. Hasil penelitian di 9 stasiun penelitian didapatkan persen rata-rata tutupan karang hidup berkisar  1.40- 44.68 %, fleshy seaweed berkisar  0.13% - 12.87%, pecahan karang berkisar 1.73 –39.40 %, dan rata-rata total biomassa ikan karang berkisar 8.93 – 253.23 kg/ha. Nilai indeks kesehatan terumbu karang berkisar antara 3-6. Sebanyak  67% stasiun penelitian mempunyai indeks kesehatan terumbu karang dengan skala 3. Indeks kesehatan karang skala 3 ditunjukkan  oleh  persen tutupan karang  hidup yang rendah, tingkat resiliensi yang tinggi dan biomassa ikan yang rendah.


2010 ◽  
Vol 83 (3-4) ◽  
pp. 253-261 ◽  
Author(s):  
Doan-Nhu Hai ◽  
Nguyen-Ngoc Lam ◽  
Joachim W. Dippner

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