Javan Hawk-eagle Research Articles

Morphometric and DNA sexing accurately in male Javan hawk-eagle (Nisaetus bartelsi) determination at Kamojang Eagle Conservation Center, West Java, Indonesia

Abstract. Withaningsih S, Ilham MF, Rosdianto AM. 2024. Morphometric and DNA sexing accurately in male Javan hawk-eagle (Nisaetus bartelsi) determination at Kamojang Eagle Conservation Center, West Java, Indonesia. Biodiversitas 25: 1167-1173. The Javan hawk-eagle (Nisaetus bartelsi) is a protected and endemic species of eagle in Indonesia whose existence is symbolized by the Garuda Pancasila. Raptors act at the top of the predatory chain and as indicators of environmental health. IUCN data states that N. bartelsi is red-listed as endangered. It is one of Indonesia's most frequently hunted and traded birds, and this trading practice has changed its natural behavior. Therefore, preservation through conservation –one of which is rehabilitation– programs are needed to maintain their sustainability. The ultimate goal of rehabilitation is to release the Javan hawk-eagle back into its natural habitat. In conservation and breeding programs, accurate determination of the sex of raptors is integral to informing conservation decision-making, population management, and research efforts aimed at protecting these iconic birds of prey and their habitats. Therefore, this study aims to determine the sex of male N. bartelsi through morphometric and DNA sexing techniques. The research subjects were seven N. bartelsi rehabilitated at Kamojang Eagle Conservation Center, Garut, Indonesia. Morphometric sexing measurements obtained the following results: two males were consistent upon comparing DNA sexing and Kamonjang Eagle Conservation Centre records observations. Analyses were obtained using primer 2550F/2718R that recognized CHD1-Z and CHD1-W as cleaved. Furthermore, the amplification was successfully read a sexing of N. bartelsi at Kamonjang Eagle Conservation Centre. The analysis primer sets mainly for raptors can assist conservation programs such as breeding programs and data collection for mapping this raptor. In addition, the PCR method can also assist in the accurate management of in-situ and ex-situ conservation.

Identifying Important Areas for the Release of Five Endemic Species in a Mountainous Landscape: Inference from Spatial Modeling Techniques

Efforts to release animals resulting from evacuation and rehabilitation into their natural habitats are important practices in wildlife conservation. Before releasing the animals, it is important to assess the habitat suitability of the areas to support the existence of the animals in the long run. Yet, there is limited study of habitat suitability assessment on national parks as release locations for wild animals. This study aimed to assess the suitable habitat of five charismatic animal species, i.e., Panthera pardus melas, Hylobates moloch, Prinonailurus bengalensis, Nycticebus javanicus, and Nisaetus bartelsi, in Gunung Halimun Salak National Park using Maxent, and to determine potential locations for releasing animal’s species. Models for the P. p. melas show 47,619 ha and 21,391 ha, respectively, suitable as habitat and potential release location, for H. moloch, each is 57,537 ha and 33,471 ha, for P. bengalensis, each is 25,460 ha and 17.189 ha, for N. javanicus, each is 29,848 ha and 15,578 ha, and for N. bartelsi, each is 44,426 ha and 25,660 ha. Our study shows that a suitable habitat can be critical in choosing a wildlife release site. Further consideration of conflict mitigation and practicalities is required to achieve the long-term existence of released species.

Projected impacts of climate change and anthropogenic effects on habitat distribution of endangered Javan Hawk-Eagle in Indonesia

Changing climate will jeopardize biodiversity, particularly the geographic distribution of endemic species. One such species is the Javan Hawk-Eagle (JHE, Nisaetus bartelsi), a charismatic raptor found only on Java Island, Indonesia. Thus, it is crucial to develop an appropriate conservation strategy to preserve the species. Ecological niche modeling is considered a valuable tool for designing conservation plans for the JHE. We provide an ecological niche modeling approach and transfer its model to future climate scenarios for the JHE. We utilize various machine learning algorithms under sustainability and business-as-usual (BAU) scenarios for 2050. Additionally, we investigate the conservation vulnerability of the JHE, capturing multifaceted pressures on the species from climate dissimilarities and human disturbance variables. Our study reveals that the ensemble model performs exceptionally well, with temperature emerging as the most critical factor affecting the JHE distribution. This finding indicates that climate change will have a significant impact on the JHE species. Our results suggest that the JHE distribution will likely decrease by 28.41% and 40.16% from the current JHE distribution under sustainability and BAU scenarios, respectively. Furthermore, our study reveals high-potential refugia for future JHE, covering 7,596 km2 (61%) under the sustainability scenario and only 4,403 km2 (35%) under the BAU scenario. Therefore, effective management and planning, including habitat restoration, refugia preservation, habitat connectivity, and local community inclusivity, should be well-managed to achieve JHE conservation targets.

First report on daily activity and feeding behavior of Javan hawk-eagle (Nisaetus bartelsi) in the protected forest of Kondang Merak Beach, Malang, Indonesia

Abstract. Ilmi AR, Luthfi M, Elfidasari D, Hidayat YS, Prawiradilaga DM. 2023. First report on daily activity and feeding behavior of Javan hawk-eagle (Nisaetus bartelsi) in the protected forest of Kondang Merak Beach, Malang, Indonesia. Biodiversitas 24: 6770-6779. The Javan Hawk-Eagle (JHE) (Nisaetus bartelsi) is an endemic bird of prey (raptor) on Java Island that is increasingly threatened due to land conversion, habitat destruction, and illegal hunting. These factors have led to its classification as a critically endangered species. There is a need to monitor one of the natural conservation areas in the southern region of East Java, namely the protected forest of Kondang Merak Beach, which serves as a habitat for Javan hawk-eagle to preserve the existence of this species. Therefore, this research aimed to understand and identify the daily activity and feeding behavior of Javan hawk-eagle in the protected forest of Kondang Merak Beach, Malang, East Java. The implication of this research is to provide ecological data for further research and disseminate information to the community to support conservation efforts of Javan hawk-eagle species in the protected forest of Kondang Merak Beach area. The methods used included field surveys, observation of daily activity and feeding behavior, collection of daily temperature data, habitat assessment, disturbance assessment, and interviews. Based on the observation of daily activity, the percentage of perching behavior was 71%, while flying behavior was 29%. The peak flying activity occurred between 9:00 and 12:00. Environmental factors such as temperature, rainfall, and human activities influenced daily activity in the conversation area. The observation of feeding behavior showed that the highest frequency belonged to the category of 23 occurrences, where the peak occurred between 14:00 and 17:00. Furthermore, the activity was affected by nesting seasons and the presence of other raptor species besides Javan hawk-eagle.

Habitat and behavior of javan hawk-eagle (Nisaetus bartelsi) in SPTN 2 Majelengka Gunung Ciremai National Park, West Java

The existence of the Javan hawk-eagle depends on the condition of the forest in its habitat. If the lowland forest is damaged, the Javan hawk-eagle will be pushed to the higher forest; This can affect the behavior of the Javan hawk-eagle because it is related to the availability of the game in each habitat type. This study aims to analyze the habitat conditions and behavior of the Javan hawk-eagle in Mount Ciremai National Park, using the checkered line method and focal animal sampling. Analysis of the Javan hawk-eagle habitat used a vegetation analysis approach and the level of use of habitat types. The results showed that the Javan hawk-eagle most often used natural forest habitat types (85.38%) at the Cipari site and plantation forests (83.14%) at the Bantar agung site. The dominant tree species in the natural forest are benda (Castanopsis argentea; 20.02%) and saninten (Artocarpus elasticus; 13.30%). Javan hawk-eagles choose trees to nest in kedondong trees (Spondias pinnata) and pine trees (Pinus merkusii ) in valleys between hills and close to water sources or rivers. Overall the behavior of the Javan hawk-eagle found is resting/perching, hunting, flying, and interacting. The most common behavior of Javan hawk-eagles found was resting/perching (80.16%) and interaction (45.88%).

Population Estimates of the Endangered Javan Hawk-Eagle Based on Habitat Distribution Modeling and Patch Occupancy Surveys

ABSTRACT Estimating the population size of threatened species is problematic and has biases because of a lack of validation data. The Javan Hawk-Eagle (Nisaetus bartelsi) is an endangered raptor endemic to the remnants of natural rainforests of Java, Indonesia. We aimed to improve the accuracy of population estimates through a combination of current habitat distribution modeling and patch occupancy surveys. Higher-resolution data sources (improved from 250 m to 30 m) were used in a predicted probability model using logistic regression. Patch occupancy surveys were conducted in habitat patches identified from a predictive analysis and field validation results after 2008. We estimated population sizes only in occupied patches ≥20 km2 (size based on Javan Hawk-Eagle home-range size). The area of suitable habitats currently totaled 10,804 km2, as calculated from the results of the 2019 predicted probability model (9106 km2) and field validation (1698 km2). The predicted area in 2019 decreased by 6.5% (638 km2) from that in 2008. We detected small suitable patches because of improvements in data resolution. The patch occupancy survey validated 44 of the 74 patches (59.5%) in the current habitat distribution. We confirmed that 38 patches (10,166 km2) were occupied by Javan Hawk-Eagles, and we estimated the population to be 511 ± 3.1 (SE) pairs. This apparent population increase is attributable to improved methodologies in predicting habitat distribution and estimating population size.

EKSPLORASI POTENSI FAUNA DI KAWASAN SUNGAI CIPUNAGARA KABUPATEN SUBANG SEBAGAI REKOMENDASI PENGEMBANGAN KAWASAN KONSERVASI

The variety of fauna is one of the certain natural wealth of Indonesia. Yet human characterisic to destroy forest has inflicted a loss. Therefore the fauna in its real habitat needs more attention so it may become a media in conserving the fauna and the habitat in order to save it for the future generation. The object of research is help to preserve the existing fauna and conservation area. The method of research by transect path and interviewing people around Wildlife Reserve of Cipunagar River, the observation on the location was done by following direction and position of transect diameter slowly and at the same time making note of any fauna species found. The result of the research that was done in wildlife resrve of Cipunagara River showed that there were 12 species of 8 families, are Panthera tigris sondaicus, Panthera pardus melas, Nisaetus bartelsi, Pteropus vampyrus, Trachypithecus auratus, Presbytis comate, Hystrix javanica, Sus verrucosus, Macaca fascicularis, Gallus gallus, and Colluricincla sp. The recommendation of fauna potential and conservation area is Taman Hutan Raya.

Board Game Design for Conservation Organization

A Javan hawk-eagle conservation organization, Yayasan Konservasi Elang Indonesia, is struggling with its marketing & publication activities. The organization then uses a board game to help their conservation works. There are educational and conservative purposes embedded in the game design to be a formal framework to overcome the challenge. Using a board game as a conservation tool engages the players and deepens their understanding of the topic, Javan hawk-eagle. The process we use to develop the framework includes mapping the learning objectives to the game component and actions, board game design steps, and implementation and production of the board game. We then compare the cognitive aspect of the educational goal in a pre-test and post-test of the learners.

Identification of spatial data and ecology of Javan hawk-eagle's nest (Nisaetus bartelsi) in the Kondang Merak Coastal, South Malang, East Java, Indonesia

Abstract. Iskandar RRD, Elfidasari D, Prawiradilaga DM. 2022. Identification of spatial data and ecology of Javan hawk-eagle's nest (Nisaetus bartelsi) in the Kondang Merak Coastal, South Malang, East Java, Indonesia. Biodiversitas 23: 3419-3428. Ecological identification of the Javan hawk-eagle's habitat (Nisaetus bartelsi) is necessary to understand the support of its life, such as the spatial data in connection with its home range, nest location, and the use of nest trees. The species must choose a location that suits its needs. According to several studies, The Javan hawk-eagle's presence was only in highland forests. The new report of The Javan hawk-eagle occurrence in Merak Kondang coastal confirmed The Javan hawk-eagle's presence in lowland forest. The objective of this study was to identify the landscape characteristics that become the habitat preferences of The Javan hawk-eagle in Merak Kondang coastal, South Malang, East Java. Analysis used in this study included habitat suitability maps, plant vegetation, spatial analysis of tree canopy, and tree nest architecture analysis. The home range of the Javan hawk-eagle in the Kondang Merak coastal, South Malang, East Java, covered an area of 149.94 Ha. Most of the home range overlapped between Javan hawk-eagle individuals, including siblings and between an individual Javan hawk-eagle with other species of eagle. The Javan hawk-eagle used Spondias pinnata as nest trees with the architectural model Scarrone. It used 3 different tree species for perching, namely Pterocymbium javanicum, Anthocephalus cadamba, and Alstonia angustiloba. In the tree phase, the dominant vegetation type was Spondias pinnata (IVI) 43,16%, the pole phase that dominates was Mallotus paniculatus (IVI) 62.31%, the dominant vegetation of the stake phase was Garcinia forbesii, and the seedling phase was Arenga obtusifolia (IVI) 71.42%. The highest diversity index (H') was in the tree phase (H’=2,34), which was in the moderately abundant category and was at an elevation of 8% (flat).

Conservations Javan Hawk Eagle (Nisaetus bartelsi) in Gunung Picis Ponorogo Nature Reserve

The Javan Hawk Eagle (Nisaetus bartelsi) is a bird prey species (raptor) at the top of the food chain cycle that only exists in Java’s Island. Population the Javan Hawk Eagle is endangered due to illegal trade, poaching, and land narrowing. The purpose of this study is to know the population of the Javan Hawk Eagle in Gunung Picis Ponorogo Nature Reserve. The identification method used is by using the suitable method and direct observation. The study results explained that in the area, the Javan Hawk Eagle was found following food supplies in nature, so that area was very suitable for the breeding process of endemic birds in Java’s Island. In 2016, one young Javan Hawk-Eagle was released in this area. In 2017 and 2018, a young Javan Hawk-Eagle and 1 adult Javan Hawk-Eagle were found. Then at the end of 2019, they released one adult Javan Hawk-Eagle at location A, so there have been four adult Javan Hawk-Eagle. Observations lasted until 2020 in that area with the same result as in 2019. Observations made in that conservation area in February - March 2020 show that the Javan Hawk-Eagle conservation continues to increase, marked by the presence of young individuals.

Perbandingan Komunitas Burung di Lahan Perkebunan Kopi dengan Naungan Pohon Alami

This study aims to compare bird communities in coffee plantation habitats with tree shade systems in natural forests or trees planted by coffee farmers. The method used is the bird encounter rate per unit time. The results showed that the quantitative ecological values ​​of birds in two coffee plantation areas were Richness Indices (RI) = 11.18, Diversity Indices (DI) = 3.71, Sorensen Indices (SI) = 45.5% and the Similarity Index of Two Habitats (ISE) = 24.3%. As many as 65% of bird species in both coffee plantations are potential insectivorous birds. In conclusion, three of the 85 bird species encountered during the study had a near-threatened (NT) conservation status, namely Loriculus pusillus, Oriolus xanthonotus, and Ficedula dumetoria. One species is categorized as Endangered (EN) namely Spizaetus bartelsi and the other species is a migratory bird, namely Muscicapa dauurica.
 Keywords: Insectivorous Birds, Habitat, Coffee Plantation, Ecological Value, Conservation Status

Patch dynamics in the Javan Hawk-Eagle (Nisaetus bartelsi) habitat of East Java

Javan Hawk-Eagle (JHE, Nisaetus bartelsi) is an endemic species in Java Island and an important biological indicator of ecosystem health. The government has issued regulations to protect this species and increase the population by 10% from 2015 until 2019. East Java has the largest JHE potential habitat in Java Island based on a previous study using satellite images of 2002. Therefore, the current habitat distribution of JHE’s is essential for getting knowledge about patch dynamics in JHE’s habitat. This study’s objective was to analyze patch dynamics of JHE’s habitat from 2002 until 2015 and validate habitat distribution. Previously predicted probability map (2002) of JHE’s were updated using Landsat 8 satellite images of 2015 and was validated through ground-truth checked. Results showed that the distribution of JHE’s habitat after validation is 28 patches, which is covered 4766.26 km2. The dynamics that occur in the JHE’s patch are patch lost(1 patch), patch area decreased (5 patches), patch area increased (13 patches), new patch (4 patches), and merged patch. After validation, there are six newly identified patches, and one patch area increased. The total area increased by 2156.14 km2 or 82.61% of the total area occupied by JHE’s in 2002. About 39.89% of total habitat patches were located inside the protected area. This study recommends continuing monitoring activities on habitat patches, including potential habitat patches in lowland areas, and proposing conservation activities based on habitat patch dynamics that occurred from 2002 to 2015.

Scientific data laundering: Chimeric mitogenomes of a sparrowhawk and a nightjar covered-up by forged phylogenies

In 2017, Gang Liu and colleagues published a paper in this journal in which they described the first mitochondrial genome of Japanese Sparrowhawk Accipiter gularis (Aves, Accipitriformes). The paper included two phylogenies (one based on full mitogenomes, the other on mitochondrial 12S/16S rRNA sequences) that placed this species among the goshawks and sparrowhawks (genus Accipiter). These phylogenies also included a previously published mitogenome of Grey Nightjar Caprimulgus indicus. Here, we show that the published mitogenome of A. gularis is a chimera of three species (a sparrowhawk, a buzzard and a dove), and that the published mitogenome of C. indicus is a chimera of two owl species. Phylogenetic re-analysis showed substantial differences from those published by Liu et al. (2017): the A. gularis sequence was placed among Streptopelia doves in the 12S/16S rRNA tree, and the C. indicus sequence was placed among Otus owls in the mitogenomic and mitochondrial 12S/16S rRNA trees. The phylogenies in Liu et al. (2017) showed several other peculiarities: (i) the inclusion of Javan Hawk-eagle Nisaetus bartelsi in the mitogenome tree (whereas no mitogenome is available of this species and no such sequence has been described in the literature), (ii) reciprocal monophyly of the genera Buteo, Leucopternis and Buteogallus (whereas multiple previous studies have shown these to be para- or polyphyletic), and (iii) the placement of Black-chested Buzzard Eagle Geranoaetus melanoleucus and Crane Hawk ‘Geranoaetus’ (=Geranospiza) caerulescens as sister species (whereas all previous studies have shown these to be distantly related). Close examination of the figures in Liu et al. (2017) revealed that both phylogenies have been manually prepared or modified. The evidence indicates that Liu et al. (2017) published phylogenies that were not based on existing data but were fabricated to reflect preconceived ideas about phylogenetic relationships. The phylogenies published by Liu et al. (2017) give the impression that the mitogenomic sequence described in their paper (A. gularis) and another one (C. indicus) described by Zhao et al. (2016) are authentic and correctly identified, whereas in reality these sequences are highly problematic chimeras. The term ‘scientific data laundering’ is proposed for the practice of hiding poor or erroneous research data with fabricated or falsified figures.

Pemodelan Spasial Kesesuaian Habitat Elang Jawa (Nisaetus bartelsi) di Taman Nasional Bromo Tengger Semeru (Spatial Modeling of Javan Hawk-Eagle (Nisaetus bartelsi) Habitat Suitability in Bromo Tengger Semeru National Park)

Bromo Tengger Semeru National Park (TNBTS) is a conservation area as the habitat of endemic species in Java Island, such as the Javan hawk-eagle (Nisaetus bartelsi). One of the spatial models of habitat is the Ecological Niche Modeling (ENM) approach. This study aimed to determine habitat suitability for the Javan hawk-eagle in TNBTS. The research was conducted from September 2019 to January 2020. The habitat suitability model used the present coordinate point data and the Javan hawk-eagle habitat environment variables. The data were then analyzed to build a Javan hawk-eagle habitat suitability model using the Maximum Entropy (MaxEnt) algorithm. The results showed three models of habitat suitability categories, i.e.: high of 15,131.18 ha (30%), medium 11,216.61 ha (22%), and low 23,298.41 ha (48%). The evaluation of the Javan hawk-eagle habitat suitability model in TNBTS has an excellent model accuracy with an AUC value of 0.97 and a standard deviation of 0.93.Keywords: endemic, habitat, Javan hawk-eagle, maximum entropy, spatial modeling

Comparative Study of Released Javan Hawk-Eagle (Nisaetus bartelsi) And Changeable Hawk-Eagle (Nisaetus cirrhatus) Based On Satellite Tracker Data

The release of a rehabilitated raptor, defined as an effort to release the raptor back into nature, have been done in Indonesia; however, only about 2% were monitored for more than one year. This is because long time intensive monitoring using simple observation equipment is difficult to do because of limited resources. Thus, more modern equipment – oneof which is satellite radio used in this research – needs to be used. The use of satellite radio to monitor the movement of rehabilitated raptors was carried out for the first time in 2018 for juvenile male Javan hawk-eagles (N.bartelsi) and adult female Changeable hawk-eagles (N.cirrhatus). The results of the monitoring of these two types of raptors showed that they mostly used forested areas close to water sources. Both types of eagles had the farthest flight distance with an average distance of ± 1,000 m / day occurring at week 4. Thus, it can be concluded that the rehabilitation efforts for these eagles were successful and that they had adapted to their new habitats as wild raptors.

Distribution and Characteristics of Javan Hawk Eagle Nesting Trees in Gunung Halimun Salak National Park, Indonesia

Javan Hawk Eagle is one of the three keys species of the Gunung Halimun Salak National Park and endemic to the island of Java. Protecting the active Javan Hawk Eagle nesting tree is one of the efforts to increase the success rate of Java Hawk Eagle breeding so that information on the distribution and characteris-tics of Javan Hawk Eagle nesting tree is needed. Field exploration was carried out to determine the existence of the Javan Hawk Eagle nest. There were 10 individuals of Javan Hawk Eagle nesting trees which consisted of 5 species namely Rasamala, Huru, Damar, Leng-sar and Manggong with tree architecture models of rauh, massart, scarrone and aubreville, tree height between 26-55 m and height of nests between 18-41m. The Javan Hawk Eagle nesting trees grow in primary, secondary, and plantation forests in a height between 670- 1295 masl, with a steep and very steep slope, the majority of the dis-tance from the river is less than 100 m and the majority of the dis-tance with ecotone is less than 600 m. Javan Hawk Eagle nest on Damar is the first finding at Gunung Halimun Salak National Park.

Habitat preferences of current record of JHE (Nisaetus bartelsi) in lowland forest in Ujung Kulon National Park

Ujung Kulon National Park (TNUK) used camera traps to help monitoring the occurrence of Javan Rhinos (Rhinos sondaicus) but the result accidentally recorded the occurrence of Javan Hawk-eagle (JHE). According to the latest habitat modelling, JHE’s presence was only in highland forests. The new report of JHE occurrence in TNUK confirmed JHE’s presence in lowland forest. The objective of this study was to identify the landscape characteristics that become the habitat preferences of JHE in TNUK. Observation and analysis were conducted around the occurrence location to obtain the information about JHE’s preferences for selecting their nesting and hunting sites. Vegetation analysis was conducted to obtain Important Value Index (IVI) and diversity index that represented plants species domination. The results indicated that in TNUK lowland forest, JHE’s habitat was distinguished into two habitat preferences based on the behaviour. JHE hunted and nested around Cigenter River and its tributary with sloping ground. Hunting and nesting habitats were both dominated by bay trees (Syzygium polyanthum) with IVI of 88.97% and 69.49%, respectively. Tree dominance that provided habitats for JHE’s diet was an important factor in determining hunting preferences, while species diversity was an important factor in determining nesting preferences.

Habitat patch connectivity of Javan Hawk-Eagle (Nisaetus bartelsi) in Eastern Part of Java, Indonesia

Javan Hawk-eagle, JHE (Nisaetus bartelsi) is an endemic raptor species of Java Island which is currently threatened due to habitat destruction, forest fragmentation, and illegal poaching. Eastern part of Java Island is the largest remaining habitat for JHE which consisted of 28 patches with an area of 4766.26 km2. Connectivity in the landscape plays a role in facilitating inter-patch movement, and as long-term conservation of biodiversity. This study was aimed to determine the degree of connectivity between habitat patches in eastern part of Java. The patches were analyzed using conefor sensonide 2.6 to determine the probability of connectivity between patches using connectivity indices. Three fractions namely PCintra, Pcflux, Pccon were used for determine the connectivity index. The results showed that seven patches were identified as core patches which was 70.32% (2965.94 km2) located inside the protected area. Thirteen patches that had PCcon under 10% as stepping stones among the patches around them. There were eight patches isolated from other patches because they had PCconnector = 0, and small patch size for supporting viable JHE population. These results will be useful for decision makers to decide the conservation priorities action in order to maintain the connectivity habitat of JHE in eastern part of Java.

Assessing potential habitat of Javan Hawk-eagle (Nisaetus bartelsi) based on landscape characteristic in Banten Province

Javan Hawk-eagle is an endangered raptor on natural forest in Java Island, Indonesia. Banten Province has six potential habitat patches based on previous research obtained from the updated of JHE habitat suitability models. The objectives of this study were to obtain landscape characteristics of potential habitat and to compare it to actual habitat characteristic based on literatures review. Data was collected through ground check activities and interviewed the key informants. Landscape characteristics were assessed through gap analysis between potential and actual habitat. Several information includes land cover, landform, slope, elevation, nest vegetation, corridor movement; human activity intensity, river, and home range were used for this study. Five levels of gap found between potential to actual habitat patches were determined from this analysis. Result showed that two patches were the highest potential, which were Mt. Karang and Mt. Aseupan in Pandeglang district. Three patches high potential (Gunung Tukung Gede Nature Reserve, Mt. Pulosari, and Mt. Honje), then one patch (South Coast) was moderately potential. Forest has dominated in six potential habitat patches with total area of 136.35 km2 (71.09 %). Only three potential habitat patches (Mt. Pulosari, Mt. Karang, Mt. Aseupan) were located in the protected forest which is covered about 20.84 km2 (9.54%). Six potential habitats JHE should be monitored continuously, increased the landscape quality, and offered conservation activities.

DINAMIKA POPULASI ELANG JAWA (NISAETUS BARTELSI) DI KAWASAN CAGAR ALAM GUNUNG PICIS DAN CAGAR ALAM GUNUNG SIGOGOR

Javan Hawk-Eagle is one of priority species which is natural population need to increase 10 percent, so that BBKSDA East Java chooses the monitoring site to monitor this species dynamic population. The observations which conduct in Gunung Picis and Gunung Sigogor Nature Reserve Areas for seven days in every years on July-August since 2013 until 2018 shows that Javan Hawk-Eagle population in those areas has been increase. The population increase show by juvenile individual and finding the species in new locations.