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Proceedings Paper

Status and threats on seagrass beds using GIS in Vietnam
Author(s): Cao Van Luong; Nguyen Van Thao; Teruhisa Komatsu; Nguyen Dac Ve; Dam Duc Tien
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Paper Abstract

Seagrasses, marine flowering plants, are widely distributed along temperate and tropical coastlines of the world. Seagrasses have key ecological roles in coastal ecosystems and can form extensive meadows supporting high biodiversity. Till now, fourteen seagrass species belonging to four families were found in Vietnam: Halophila beccarii, H. decipiens, H. ovalis, H. minor, Thalassia hemprichii, Enhalus acoroides, Ruppia maritima, Halodule pinifolia, H. uninervis, Syringodium isoetifolium, Cymadocea rotundata, C. serrulata and Thalassodendron ciliatum. A total area of seagrass beds in Vietnam is estimated to be approximately 17000 ha by satellite images and GIS technology. In recent years, the distribution areas and densities of seagrass beds in Vietnam have been serious decreased compared with those 10-15 years ago. The decline level depended on the impacts by the natural process, the economical activities and the conservation awareness of local people. Thus, it is different at each coastal area. Generally speaking, the distribution areas and densities of seagrass beds were decreased by more than 50%. Seagrasses on tidal flats in some areas such as Quang Ninh, Hai Phong, Phu Quoc seem to be nearly lost. The distribution areas of seagrass beds in 2009 at Tam Giang-Cau Hai lagoon and Cua Dai estuary was decreased by 50-70% of those in early 1990s.

Paper Details

Date Published: 11 December 2012
PDF: 13 pages
Proc. SPIE 8525, Remote Sensing of the Marine Environment II, 852512 (11 December 2012); doi: 10.1117/12.977277
Show Author Affiliations
Cao Van Luong, Institute of Marine Environment and Resources (Viet Nam)
Nguyen Van Thao, Institute of Marine Environment and Resources (Viet Nam)
Teruhisa Komatsu, Univ. of Tokyo (Japan)
Japan Science and Technology Agency (Japan)
Nguyen Dac Ve, Institute of Marine Environment and Resources (Viet Nam)
Dam Duc Tien, Institute of Marine Environment and Resources (Viet Nam)


Published in SPIE Proceedings Vol. 8525:
Remote Sensing of the Marine Environment II
Robert J. Frouin; Naoto Ebuchi; Delu Pan; Toshiro Saino, Editor(s)

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