The Connectivity of Javan-Hawk Eagle’s (Nisaetus bartelsi) Landscape Habitat in West Java

Posted by Sekilas Peternakan on

Sunday 8 October 2017

NUR AZMI. The Connectivity of Javan-Hawk Eagle’s (Nisaetus bartelsi) Landscape Habitat in West Java. Supervised by SYARTINILIA and YENI A MULYANI.

Javan Hawk-Eagle (JHE, Nisaetus bartelsi) is an endemic bird species in the natural forests of Java, Indonesia. JHE is categorized as one of the endangered raptors in IUCN Red List of Threatened Species, 2007. Small population size, severe habitat loss, forest fragmentation, and illegal hunting have contributed to the ‘‘endangered’’ status of this species. Moreover, conservation of this species has become a national priority. Unfortunately lack of information about current conditions of the distribution of JHE’s remnants habitat caused the proposing conservation strategies for JHE become difficult. The last data determined the habitat suitability probability modelling of JHE with used landsat images in 2002 (Syartinilia and Tsuyuki 2008). The model showed that JHE’s habitat depends on slope, elevation, and NDVI variables. This study updated the model based on the previous study in West Java as case study. Therefore, this study proposed to analyze the current condition of JHE’s habitat patches remaining in West Java. Furthermore this study continued with landscape connectivity and metapopulation analysis. The final results of this study provide recommendations landscape habitat management of Javan Hawk-Eagle in West Java. This study used Geographic Information System (GIS) with new satellite image (Landsat 8, 2014). The current condition of JHE’s habitat patches were obtained by updating the habitat suitability probability modelling of JHE trough maps input (slope, elevation and NDVI) into RAMAS GIS software. Connectivity analysis was being conducted by applying the probability of connectivity index (PC) by Saura dan Pascual (2007). Habitat patches distribution of JHE and connecitivity characteristic were the components that being used to produce the metapopulation model. Metapopulation models were analyzed spatialy by evaluating the habitat patches distribution with 5 metapopulation models by Harrison (1990). The result of this study is 17 habitat patches which distributed all over West Java with total coverage around 3 955 km2 . But only 36.16% of the total habitat patches size located inside protected area. The landcover of habitat patches were dominated by forest (38.87%), plantation (22.48%), bushes (15.12%) and agricultural land (9.15%). The number of current conditions of JHE’s habitat patches were increased by 3 patches and the total coverage area were increased by 741 km2 . Based on the PC index calculation, it can be obtained three important indices which are PCintra, PCflux, and PCcon. High value of PCintra and PCflux showed that those patches are core habitat. Meanwhile, the PCcon=0 value showed which patches were isolated. Trough PC index calculation we get the result of 4 core habitat patches and 6 isolated habitat patches. The metapopulations model was mainland-island model with two clusters. Based on all the results it was able to provide 5 recommendations for increasing the survival of JHE in the natural habitat remnants in West Java.

Keywords: GIS, Javan-Hawk Eagle, landscape connectivity, metapopulation, remnant habitat

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