Lesson learned from Segara Anakan Mangrove Ecosystem Central Java: Past, present and threatened future
Professor Tjut Sugandawaty Djohan, Laboratory of Ecology and Conservation, Faculty of Biology, Universitas Gadjah Mada
In the 1980, the problems of the SA mangrove were heavy siltation, selective loggings of tree species. The siltation is due to the bad management in the watershed. Each year, the lagoon experiences 4.5 Mton of sediment from the Citanduy River. The tree gap area was dominated by Achantus ilicifolius. In the 1997, large areas of SA were changed to the intensive shrimp-ponds, which were failure and abandon. These areas were colonized by A. ilicifolius and Derrys heteropylla. In the 2007, the water salinity was not response to the daily tides, but to the seasons. During the rainy season was hypo-haline, but during the dry season was hyper-haline. At present the salinity is 0 ppt, and people try to grow rice-paddy. The climate change is worsen the SA mangrove. The attempts of mangrove tree rehabilitations were performed, but it was failed. Thus the future of SA mangrove are in questioned.
Key words: heavy siltation, mangrove tree densities, Acanthus ilicifolius, abandon shrimp-pond