Archive for August, 2012

Master Thesis : Nest Distribution of Carettochelys insculpta Ramsay 1886 at Vriendschap river, Asmat District, Papua

Richard Gatot Nugroho Triantoro, MD.Kusrini, & LB.Prasetyo

ABSTRACT

Carettochelys insculpta (pig-nosed turtle) is one of  protected species the Labi-Labi, which can be found only in southern Papua. Its distribution spread from the Merauke to Kaimana. Information of C. insculpta is very limited, such as its distribution and population status. Unfortunately,  pressure and threats to C. insculpta are increasing inline with development in Papua. Information of distribution and population is very important for its future management. For those reasons, this study aims to determine the pattern of distribution and nesting habitat selection of C. insculpta in the Vriendschap river, Asmat regency, Papua. The study was conducted on 8 to 25 November 2011. The method used is survey with the transect system. Analysis of data on nesting habitat in Descriptive while the distribution pattern of nests made by the Ratio Variety Method and the Index Method. The results showed the distribution pattern of nests and tracks C. insculpta in Vriendschap River region iwas clumped with the parameters that most influence the presence of nest amount and tracks on the nest and laying sand is parameter of the vegetation cover area. Distribution of nests and tracks were found clustered in the Obokain region whose position is at the center of the length of the Vriendschap River.

Corresponding author :  richard_gnt@yahoo.com

Master Thesis : Spatial Modelling for Distribution and Habitat Suitability of Invasive Alien Species Kirinyuh (Austroeupatorium inulifolium (Kunth) R. M. King & H. Rob) in Mandalawangi Resort Gunung Gede Pangrango National Park)

Marlenni Hasan, Agus Hikmat, Lilik Budi Prasetyo

 ABSTRACT

The existence of invasive alien species influenced the ecosystem, and at the same time could not be controlled. This could cause disturbance of ecosystem function and also declined forest value, ecologically and economically. Some national parks have been facing serious threat caused by invasive alien species and 37 species were identified in Gunung Gede Pangrango National Park (GGPNP). It is important to carry out this research in GGPNP since the information on the distribution and habitat suitability for invasive alien species, especially for kirinyuh, is still limited. The objectives of this research were to determine the distribution and habitat suitability model for kirinyuh and the suitability degree of GGPNP as habitat for kirinyuh. Binary Logistic Regression Analysis and Principal Component Analysis were used to predict probability of habitat suitability for kirinyuh. Fifty percent of recorded data was used to build a predictive model and the rest was used to validate the model. Habitat requirements were analyzed and quantified from digital topographic maps, ASTER DEM and Landsat 7 ETM+. The result showed that predictive model of habitat suitability for kirinyuh was affected by elevation, NDMI, NDVI, distance to farmland and distance to trail. The result suggested Principal Component Analysis was more appropriate than Binary Logistic Regression.

Keywords: habitat suitability, binary logistic regression analysis, principal component analysis, kirinyuh, Resort Mandalawangi Gunung Gede Pangrango National Park, GIS

Corresponding author :  Marlenni Hasan  (lennikris@yahoo.com)