Seagrass mapping in East Bintan coastal area, Riau Archipelago, Indonesia

概要

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Sea-truthing based on Satellite Image Data recorded at 28^<th> April 2000 by Landsat 7 with sensor ETM+ was carried out in September 2004 to map the extend of seagrass of East Bintan coastal area. Due to the ability in penetrate through water depth, only bands with the wave length of 1 (0.45-0.52μm), 2 (0.53-0.60μm) and 3 (0.61-0.69μm) were used for image analysis purpose. Approximately 2,093.66ha total of seagrass was estimated in the area of study. The widest area of seagrass was recorded in the northern part of East Bintan, Tanjung Berakit i.e ±847.29ha with percent coverage ranged between 46 to 56%. It was found that 10 of 13 species of Indonesian seagrass exist in. They are namely, Cymodocea rotundata, C. serrulata, Enhalus acoroides, Halodule pinifolia, H. uninervis, Halophila ovalis, H. spinulosa, Syringodium isoetifolium, Thalassia hemprichii and Thalassodendron ciliatum. The most dominant species in the area is Thalassodendron ciliatum. The existence of Halophila spinulosa is noteworthy, since In Indonesia, this species is considered to be rare. Beside in this location, it existence was only reported in Kuta Bay, Lombok (Kiswara 1994). In East Bintan coastal area, it was found only in Tanjung Berakit with very low percent coverage (<5%) and patchy distribution.
東京大学の論文
2006-04-28