| Summary: | These researches started from 2004. Mangrove ecosystems in West Borneo have been degraded because of land conversion to be settlement, coconut farms, and shrimp-fishponds. They play important roles and give ecological services such as protect the coastal areas from the strong current and wave.
These researches were to study the structure and abundance of mangrove vegetation, the change of coastal line. The sites were selected base on the quality of mangrove present, which were several villages in Pontianak Regency and Bengkayang Regency. The vegetation data were collected with transect line quadrate plot across the mangrove zones and disturbed areas in back swamp of settlement areas. The changing of the coastal line between the 1972 map and landsat imagery of the 2004 modify by Arcview GIS 3.3.
The results showed there were 12 species of mangrove. These species were sparsely distributed. The mangrove conditions were better at Peniti Luar village. Even though the mangrove at Peniti Luar village was better then the other areas, the present of Acanthus ilicifolius in this area as indication that the area was degraded. The mangrove canopy and basal area had positive correlation as the coastal protect from abrasion. It means that mangroves protect the shoreline of West Borneo. Thus the present of one ha mangrove vegetation saved US $ 6.7 millions per Ha.
Key words: Mangroves, canopy, abrasion, reclamation, protection, ecology value,
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