YANTO SANTOSA
2Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry, Bogor Agricultural University, Darmaga Campus, Bogor 16680, Indonesia

Published : 55 Documents
Articles

Cohabitation Study of the Leaf Monkey and Bornean White-Bearded Gibbons in Gunung Palung National Park, West Kalimantan SANTOSA, YANTO; TAQIUDDIN, .; MUSTARI, ABDUL HARIS; RAHMAN, DEDE AULIA
HAYATI Journal of Biosciences Vol 19, No 3 (2012): September 2012
Publisher : Bogor Agricultural University, Indonesia

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Abstract

Diet and habitat overlaps were studied for the leaf monkey (Presbytis rubicunda) and bornean white-bearded gibbons (Hylobates albibarbis) in tropical forest of Cabang Panti Research Station (CPRS), Gunung Palung National Park, West Kalimantan. Systematic data on feeding and ranging behaviour were collected from August 2009 up to February 2010 for the three groups of two sympatric primate species that shared two neighbouring patches. Our results showed that seven types of habitat in CPRS were affected to both primates, particularly in plant utilization for feed and the use of vertical space patterns. If the leaf monkeys were present in the same forest patch, the Bornean white-bearded gibbons showed a reduced within-group dispersal and significantly less foraging time in a given forest patch. This might be due to the bornean white-bearded gibbons were more selective in their diet selection. When fruits were scarce, bornean white-bearded gibbons spent most of their foraging time in many types of forest ecosystem, while leaf monkey foraged within one or two types of forest ecosystem. At this period, diet and habitat overlaps between the two species were low. When the availability of fruits increased, leaf monkeys shifted their foraging range and both species became confined to the forest habitat. Consequently, the overlaps of diets and habitats were increased while the peak was at the end of the fruit season.
Analisis Preferensi Habitat Badak Jawa (Rhinoceros sondaicus, Desmarest 1822) di Taman Nasional Ujung Kulon (Habitat Preference Analysis of Javan Rhino (Rhinoceros sondaicus, Desmarest 1822) in Ujung Kulon National Park) Rahmat, U Mamat; Santosa, Yanto; Kartono, Agus Priyono
JURNAL MANAJEMEN HUTAN TROPIKA Vol 14, No 3 (2008)
Publisher : Bogor Agricultural University

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Abstract

Javan rhinoceros (Rhinoceros sondaicus) is one of the rarest rhinoceros that are still existing today. Their distribution is limited to only a handful of countries including Indonesia, Vietnam, and possibly in Cambodia and Laos. In Indonesia, the species is only found in Ujung Kulon National Park (UKNP). Its population is concentrated in the Ujung Kulon peninsula. Theoretically, large animals have preferences in their habitat and therefore tend to distribute uniformly or clumped. In consequence, the management of javan rhino population and habitat must consider their habitat preference. The objectives of this study were: 1) to identify dominant habitat components that determine the presence of Javan Rhinoceros in UKNP, and 2) to formulate habitat preference typology. The study was carried out in Management Section II area of UKNP, Pandeglang District, Banten Province. Method applied was direct field observation and literature review.  Based on multiple linear regressions, the dominant habitat factors preferred  javan rhino were soil pH (X7) and salinity (X9). The equation formulated was  Y = 6.25 – 1.12 X7 + 3.88 X9.  Using Neu’s method of preferential index analysis, it was revealed that Citadahan, Cibandawoh, Cikeusik and Cigenter had preferential indices greater than 1.  The data shows that javan rhinoceros mostly prefer habitats located 400-600 m from the coast, and areas located 0-400 m was considered as their second preference. Keywords: Ujung Kulon National Park, javan rhinos, habitat preferences, soil, salinity
Precision of Nest Method in Estimating Orangutan Population and Determination of Important Ecological Factors for Management of Conservation Forest Santosa, Yanto; Rahman, Dede Aulia
JURNAL MANAJEMEN HUTAN TROPIKA Vol 18, No 1 (2012)
Publisher : Bogor Agricultural University

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Abstract

Orangutan as an umbrella species is closely interlinked with sustainable forest management meaning that the protection of this species has implications on the protection of other species and maintain ecosystem stability.  The total natural habitat required to support orangutan’s population could only be determined by the appropriate population size. It is associated with the carrying capacity to accommodate or fulfill the habitat requirements of a wildlife population. Selection and delineation of core and wilderness zones as habitat preference should be based on the results of preference test shown by the spatial distribution of orangutan population. Value of the coefficient  of  variation (CV) was used to observe the precision of the population estimation and to identify important ecological factors in selection of nesting trees.  The study resulted in varied CV spatial values for various habitat types: 22.60%,  11.20%, and 13.30% for heath, lowland dipterocarp, and peat swamp forest, respectively. In the other side, CV temporal values for various habitat types were 5.35%, 22.60%, and 17.60% for heath, lowland dipterocarp, and peat swamp forest, respectively. This indicated that the population density in each type of forest ecosystems had a variation based on location and did not varied according to time of survey.  The use of  nest survey technique showed good reliable results in estimating orangutan population density.  Efforts to improve the precision of estimation can be done by formulating r value as the harmonic average of nest production rates and t as the average of nest decay time per nest category. Selection of habitat preference and nest trees were influenced by food availability thus should form important consideration in conducting nest survey to avoid bias in estimating orangutan populations.Keywords: conservation forest management, nest survey, orangutan, population size, ecological factors
Habitat Suitability Modeling of Javan Rhino (Rhinoceros sondaicus Desmarest 1822) Ujung Kulon National Park Rahmat, U Mamat; Santosa, Yanto; Prasetyo, Lilik Budi; Kartono, Agus Priyono
JURNAL MANAJEMEN HUTAN TROPIKA Vol 18, No 2 (2012)
Publisher : Bogor Agricultural University

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Abstract

Javan rhino (Rhinoceros sondaicus Desmarest 1822) is the rarest species among 5 species of rhinos in the world. Its distribution is currently limited only in Ujung Kulon National Park (UKNP), Indonesia.  Due to the small population size and its limited distribution, it is listed as critically endangered species in the IUCN Redlist. The main objectives of this research were: 1) to identify the dominant habitat components that determine the presence of javan rhino in UKNP; 2) to analyze habitat suitability of javan rhino (Rhinoceros sondaicus Desmarest 1822) in UKNP using geographical information system; and 3) to examine its habitat condition. Results of the research found eight components identified to be crucial for Javan rhino habitat and appropriate for spatial modelling of habitat suitability, of which four were the most dominant factors influencing the frequency of javan rhino presence. These four dominants factors were slope, distance from wallow sites, distance from rumpang (open area), and distance from beach (p
Javan Rhino (Rhinoceros sondaicus Desmarest 1822) Utilization Distribution and Habitat Selection in Ujung Kulon National Park Santosa, Yanto; Rahmat, U Mamat; Prasetyo, Lilik Budi; Kartono, Agus Priyono
JURNAL MANAJEMEN HUTAN TROPIKA Vol 19, No 1 (2013)
Publisher : Bogor Agricultural University

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Abstract

Javan rhino (Rhinoceros sondaicus Desmarest 1822) is one of world´s rarest endangered species (IUCN 2008). Currently,  their distribution  is  limited  to Ujung Kulon National Park  (UKNP) of  Indonesia. Natural disasters, disease, poaching, encroachment, and competition are threats  facing Javan rhino´s population, hence creating pockets of habitats outside  the UKNP was necessary and  should be based on  scientific  studies of  javan  rhino utilization distribution and habitat selection in UKNP as the natural habitat. The objectives of the study were to determine  the utilization distribution of Javan rhino and  its habitat characteristics and determine  javan rhino habitat selection within UKNP.  The research  indicated  that Javan rhinos highest use of areas comprised of swampy shrub (w = 2.197) and shrub (w = 2.012), relatively open habitat (w = 4.233), flat area (w = 1.313) and slightly sloping areas (w = 1.007), lowland (w = 1.346), close to river (w = 1.087), close to road network (w = 1.395), close to coasts/beaches (w = 1.862), close  to wallowing areas (w = 3.709), and close  to rumpang (w = 3.783).  The results suggested  that  javan  rhino  showed  selection and preferences  for  its habitat.Keywords:  javan  rhino, utilization distribution, habitat  selection, preferences
Habitat Selection and Activity Pattern of GPS Collared Sumateran Tigers Priatna, Dolly; Santosa, Yanto; Prasetyo, Lilik Budi; Kartono, Agus Priyono
JURNAL MANAJEMEN HUTAN TROPIKA Vol 18, No 3 (2012)
Publisher : Bogor Agricultural University

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Abstract

Although translocation has been used in mitigating human-carnivore conflict for decades, few studies have been conducted on the behavioral ecology of released animals. Such information is necessary in the context of sustainable forest management. In this study we determine the type of land cover used as main habitat and examine the activity pattern of translocated tigers. Between 2008 and 2010 we captured six conflict tigers and translocated them 74-1,350 km from their capture sites in Sumatera. All tigers were fitted with global positioning system (GPS) collars. The collars were set to fix 24-48 location coordinates per day.  All translocated tigers showed a preference for a certain habitat type within their new home range, and tended to select the majority of natural land cover type within the landscape as their main habitat, but the availability of natural forest habitat within the landscape remains essensial for their survival. The activity of male translocated tigers differed significantly between the six time intervals of 24 hours, and their most active periods were in the afternoon (14:00-18:00 hours) and in the evening (18:00-22:00 hours). Despite being preliminary, the findings of this study-which was the first such study conducted in Sumatera-highlight the conservation value of tiger translocation and provide valuable information for improving future management of conflict tigers.Keywords: activity pattern, GPS collars, habitat selection, sumateran tiger, translocation
Pendugaan model pertumbuhan dan bentuk sebaran spasial populasi banteng (Bos sondaicus dAlton) di taman nasional alas purwo jawa timur Santosa, Yanto; Paturohman, Gugum Gumilar
Jurnal Ilmu Pertanian Indonesia Vol 14, No 3 (2009): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Population of bulls in the world is decreasing to 80%. on Java and Bali, the habitat of the species has declined by about 20% and 30% respectively (IUCN 2003). In Java, especially in Alas Purwo national park, the decreasing population of bulls is caused by hunting and degradation of habitat. the estimation of growth bulls population in APNP is increase. The size of population in the beginning is 588 individuals the rate of growth is 0.093 and caryying capacity of habitat is 4772 individuals.
Pendugaan parameter demografi dan bentuk sebaran spasial biawak komodo (Varanus komodoensis Ouwens 1912) di Pulau Rinca, Taman Nasional Komodo Santosa, Yanto; Muhammad, R. Yosi Zainal; Rahman, Dede Aulia
Jurnal Ilmu Pertanian Indonesia Vol 17, No 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Komodo is one of the protected rare reptiles that can only be found within the Komodo National Park and the northern island of Flores. This study was aimed to determine the species poputation parameters and spatial distribution. Data collection on population and spatial distribution of komodo were conducted using 2O transects with four repetitions, of which 5 transects were placed in the deciduous forcst and 15 in the savannah with a total sampling anea of 200 ha. The form of spatial distribution was obtained using the methods of variance ratio, dispersion index, green index, clumping index and chi-square, In addition, vegetation analysis was carried out on a 4 ha sampling plot. Results of the observations indicated that the size of the komodo population on Rinca Island was 698 individuals with a density of 3.15 individuals/kmz comprised of: adults with 1,7 individuals/km2; sub-adults with 0.65 individuals/km2; juveniles with 0.8 individuals/kmz and infants with 0.4 individuals/kmr. The density of komodo in the deciduous forest (8.4 individuals/km2) was much higher than in the savannah (O.64 individuals/km2). The birth rate of komodo (LL.27o/o) was higher than the mortality rate (4.23ort), The sex ratio was 3:1. Within the study area, komodo distributed within clusters as indicated by the ratio of mean value of 3,77; dispersion index 3.72i green index O.O8; clumping index 2.72 and chi-square 167,059.6, Chance of encounters with Komodo in both types of habitat was much higher in the morning (80o/o) than during the day (20%).
Prospek pengembangan kebun buru rusa Perum Perhutani BKPH Jonggol Jawa Barat berdasarkan tinjauan Ekologi Santosa, Yanto; ., Firmansyah
Jurnal Ilmu Pertanian Indonesia Vol 17, No 1 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

One fom of sustainable wildlife utilization with ecological and economic values is game hunting. Due to game huntingt promising prospects, Perum Perhutani planned to develop their deer captive breeding area (PRJ) into a hunting garden. The objective of this research was to study the prospects of deer captive breeding area of Perum Perhutani BKPH Jonggol, West Java into a hunting garden based on ecological considerations. The research was conducted for three months from June - August 2006. Based on direct observation, interuiews with the locals and local officers, and observation of land cover change due to increase in population, it was concluded that Block 9 was the most ideal site for hunting garden due to its varied slopes which was preferred by deers, ideal land ooverages such as grassland, shrubs and plantation forest, lack of enclave, abundant grazing area and accessible by the hunters. Based on land topography and land coverage, the most suitable huntingmethod for Block 9 was stalking. According to the Directorate General of PHPA (1988), the only weapon allowed for game hunting is firearm. Based on calculations and literature reviews, the maximum number of huntersallowed in Block 9 is 108 hunters per year with a hunting season of two months, during July and October. Assuming l00o/o hunting success with maximum number of hunters allowed, the hunting quota would be 108 deer per year. Furlfier studies are required to determine the number of initial population to be introduced to the hunting area and time to start hunting activities, as well as prospects of PRI development as hunting garden based on socio-economic considerations.
STUDI BIAYA DAN PENDAPATAN PENANGKARAN MONYET EKOR PANJANG (Macaca fascicularis Raffles) DENGAN SISTEM TERBUKA, SEMI TERBUKA DAN TERTUTUP (Expenses and Earnings Study of Breeding of Long Tail Macaque with Open, Semi Open, and Closed Systems) Paryadi, Sugeng; Santosa, Yanto; Ontarjo, Jojo
MEDIA KONSERVASI Vol 11, No 2 (2006): Media Konservasi
Publisher : MEDIA KONSERVASI

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Abstract

The study was conducted to calculate the earning and expenses of three kinds breeding system of long tail macaque i.e open, semi-open and close breeding system, respectively in PT PRESTASI Farma Nusantara, CV New Inquitex Primates Division and CV Wahana Satwa Loka. Discounted cash now analysis for ten years period were used to determine the earning and expenses, using 18% of interest rate. According to NPV, IRR and BCR values for 1000 macaques in captive showed that the earning and expenses were difference between these breeding system, where closed system was higher than the others. Based on product grade, close system was better (level B) than semi-open (level C) and open system (level D).Keyword : Macaca fascicularis, breeding system, expenses, earnings