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Satellite image analysis reveals changes in seagrass beds at Van Phong Bay, Vietnam during the last 30 years
- Source :
- Aquatic Living Resources. 33:4
- Publication Year :
- 2020
- Publisher :
- EDP Sciences, 2020.
-
Abstract
- Seagrass meadows are fragile ecosystems in the coastal zone. Natural disasters, land reclamation and various human activities seem to exert negative impacts on the distribution and biological performance of seagrass beds in Vietnam. In this present study, satellite Landsat TM/OLI image analysis was applied to determine changes in seagrass distribution at Van Phong Bay, Vietnam in the last 30 years. The maximum likelihood decision rule was used to extract seagrass bed distribution data. The error matrix using the in situ reference data for HLM image classification was 81–95% accurate, and Kappa coefficients were between 0.72 and 0.91. The results indicated that 186.2 ha (or 35.8%) of the original seagrass beds were lost in the last three decades at Van Phong Bay, and decline in each specific site may have been due to different causes. Typhoons may have caused the loss of seagrass beds at open-sea sites whereas aquaculture activities, excavation and terrigenous obliteration may have caused such losses in protected sites.
- Subjects :
- 0106 biological sciences
0303 health sciences
biology
business.industry
Terrigenous sediment
010604 marine biology & hydrobiology
Aquatic Science
biology.organism_classification
01 natural sciences
03 medical and health sciences
Seagrass
Land reclamation
Aquaculture
Typhoon
Satellite image
Environmental science
Ecosystem
Physical geography
business
Bay
030304 developmental biology
Subjects
Details
- ISSN :
- 17652952
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Aquatic Living Resources
- Accession number :
- edsair.doi...........2e51b3a920e435d9e1536b44ea55ab46
- Full Text :
- https://doi.org/10.1051/alr/2020005