PANTAUAN INFEKSI Neochetina spp PADA Eichhornia crassipes DI DAS MARO MERAUKE PAPUA BERDASARKAN CITRA LANDSAT TM dan ETM

• Main Authors: Sulistyawan, Barano Siswa, Hartono, ., Djohan, Tjut Sugandawaty
• Format: Article PeerReviewed
• Language: English
• Published: Sekolah Pascasarjana UGM 2003
• Subjects: Ecology; Freshwater Ecology
• Online Access: https://repository.ugm.ac.id/32672/1/05_2003_TeknoSains_III_September_2003.pdf; https://repository.ugm.ac.id/32672/
• Institution: Universitas Gadjah Mada

In the past ten years the water hyacinth (Eichhornia crassipes) has spread throughout the oxbow lakes and the rivers tn Maro catchment in Merauke. In 1995 World Wide Fund (WWF) had released the weevils (Neochetina bruci and N.eichhorniae) on Maro River to control the the spreading of water hyacinth population.So far there is no information how wide is the spreading of infected Neochetina spp to the water hyacinth. This research were 1) to study different spectral responses between healthy and sick water hyacinths based on brightness values of Landsat TM and ETM images, 2) to determine the priority of wat er hyacinth monitoring and zoning of distribution using the Landsat TM and ETM images. The study focused on the rivers,swamps and oxbow lake of Maro catchment. To monitor the infection Neochetina spp on water hyacinth population, we used satellite images of landsat TM on 10 November 1990, 26 january 1998 and landsat ETM on 25 October 2001. The interpretation and analysis of satellite images base on spectra patterns of between healthy and sick water hyacinths .We use scoring approach to determined spread and zoning distribution of water hyacinths population covered.During the ground check, we also measured of salinity, surface current, water level fluctuation, pH, temperature. We collected samples base on stratified proportional random sampling method. We collected the covered data in dominant aquatic macrophyta. The results showed these were the difference between spectral value of water hyacinth population on satellite images before and after released the weevil, Neochetina bruchi and N. eichhorniae. The spectral value were 120.1 in oxbow lake and 103.1 in the rivers from1990 Landsat TM image, while image da ta after 1995 for oxbow lake and river were 77. 15 and 49. 47 from 1998 Landsat TM; 100.45 and 74.12 from 2001 Landsat ETM Image, respective ly. These values indicated the condition of healthy and sick of water hyacinth in Maro catchment. This means that The weevil successful attacked the water hyacinth population gradually after then released in 1995. The sick water hyacinth has distributed on the rivers and oxbow lakes in Maro catchment. The satellite Landsat TM and ETM images is a good method to monitoring the biological control of water hyacinth spreading. Keywords : Neochetina, Landsat brightness value, invasive species, monitoring.