Mangrove health distribution on forest classes in the eastern waters of Biak Island, Papua I Wayan Eka Dharmawan, Dietriech G. Bengen, I Wayan Nurjaya, Rastina, Yaya Ihya Ulumuddin, Doni Nurdiansah, Jeverson Renyaan
Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University, Bogor, Indonesia
Research Center for Oceanography, National Research and Innovation Agency, Jalan Pasir Putih 1. No 1. Ancol Timur, Jakarta Utara
Abstract
Mangrove structure influenced by geomorphological and environmental parameters gradient forms specific group dominated zones. A study of mangrove zonation in small islands was conducted along the eastern waters of the Biak, Papua. This study aimed to investigate mangroves zones distribution and their areas. Another objective of this study was to spatially determine the mangrove health index along the zones in seven mangrove sites, i.e. Ruar-Yenusi, Tanjung Barari, Owi, Auki, Wundi, Pai, and Padaidori island. The random forest technique was applied in the Google Earth Engine platform to classify mangrove zones. On the other hand, MHI distribution was estimated by a spatial model combining several vegetation indices. Classification analysis resulted in high accuracy by 93% of overall accuracy and 0.91 of kappa coefficient. The Rhizophora-dominated forest was dominant in Tanjung Barari and Padaidori island, while the Bruguiera zone had a majority distribution in Pai and Auki islands. Sonneratia zone has significant coverage in Owi and Wundi islands. Those three zones were found in a similar area in Yenusi-Ruar mangrove. In terms of MHI distribution, Rhizophora and Bruguiera forests were dominantly in an excellent category which indicated that mangroves on the Biak^s eastern coast were in a pristine condition.
Keywords: Mangrove- Forest Zone- Random Forest Classification- Mangrove Health Index-
Topic: Marine and Fisheries Geographic Information System (International)
