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| Nijman, Vincent. |
| As one of the fundamental units of ecology and biogeography, the geographic distribution of the endemic and threatened ebony leaf monkey Trachypithecus auratus (E. Geoffroy Saint-Hilaire, 1812) on the islands of Java, Bali, and Lombok (Indonesia) has been assessed. All localities where the species has been collected are listed, and forty-two areas (each in itself consisting of numerous smaller sites) where the species has been recorded are discussed. The species occurs in a large variety of forest types, including mangrove, beach, and freshwater swamp forest; everwet lowland and hill forest; dry decidious forest; montane forest up to 3,000 – 3,500 m a.s.l.; and in some forest plantations (teak Tectona grandis, rasamala Altingia excelsa, acacia Acacia spp).... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Colobinae; Colobine monkeys; Distribution; Indonesia; Java; Langur; Lombok; Primates; Bali. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534369 |
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| Nijman, Vincent. |
| The colobine monkey Presbytis comata is confined to the rain forests of West and Central Java, Indonesia. In order to determine its distribution, a review of the literature, evidence from the study of museum specimens, and the results of recent surveys are presented. Recent surveys in the central parts of the island indicate that P. comata is still present on four volcanic mountain complexes, viz. Mt. Sawal, Mt. Slamet, Mts. Dieng, and Mt. Lawu. The present paper gives the results of the surveys combined with a review of its distribution. Altitudinal and habitat preferences, and the conservation status of the species are discussed. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cercopithecidae; Indonesia; Java; Presbytis comata; Presbytis fredericae; Primates. |
| Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/504066 |
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| Nijman, Vincent. |
| Dit rapport geeft een overzicht van de resultaten van onderzoek naar genetische variabiliteit in de zandhagedis Lacerta agilis, uitgevoerd in de periode 1993-1995 op het Instituut voor Systematiek en Populatiebiologie, Universiteit van Amsterdam. In totaal zijn van 83 individuen uit acht locaties (zes duingebieden en twee heidegebieden in zuidoost Nederland) weefselmonsters genomen op een non-destructieve manier. Met behulp van elektroforese is de variatie in 23 enzymen zichtbaar gemaakt. De gemiddelde heterozygotie per individu ligt tussen de 0.041 en 0.049. Dit is in overeenstemming met eerder gevonden waarden binnen het genus Lacerta en deze waarde geeft geen aanleiding te veronderstellen dat de bemonsterde zandhagedispopulaties door een genetische... |
| Tipo: Article / Letter to the editor |
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| Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/506343 |
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| Sözer, Resit; Nijman, Vincent. |
| In the period December 1993 – January 1995 research on the behavioural ecology, distribution and conservation of the Javan Hawk-eagle Spizaetus bartelsi was carried out by R. Sözer and V. Nijman, under supervision of BirdLife International / PHPA – Indonesia Programme. This research was part of the requirements for graduation in the study of Biology at the University of Amsterdam (UVA). During the seven-month of fieldwork many new data were collected on these subjects and recommendations for the conservation of the Javan Hawk-eagle were formulated. The main research aims were: 1) a study of the home range, habitat requirements and behaviour of the Javan Hawk-eagle, and 2) a study of the distribution of the hawk-eagle with special reference to the central... |
| Tipo: Article / Letter to the editor |
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| Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/506347 |
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| Balen, S. (Bas) van; Nijman, Vincent; Sözer, Resit. |
| The endemic Javan hawk-eagle Spizaetus bartelsi is considered threatened with extinction because of its small population size and fragmentation of its habitat on the densely populated island of Java, Indonesia. Like many other tropical forest raptors little is known about many of its population parameters. Research was carried out from 1980 to 2000 in order to assess the status of this species. Its presence was confirmed throughout the island in both wet and dry climatic zones. Home range sizes were calculated to range between 12-36 km², and comparison with published estimates suggests that these may differ significantly between areas. Encounter rates are in the order of 0.1-0.9 birds per survey day, and were significantly higher in areas with a short dry... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Birds-of-prey; Raptor; Forest fragmentation; Java; Indonesia. |
| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/534326 |
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| Nijman, Vincent. |
| Hose’s leaf monkey Presbytis hosei is endemic to Borneo and occurs only in tall forest. In recent decades Borneo has lost a large part of its forest cover, mostly in low-lying coastal regions. Large intact tracts of forest remain in the interior, but these are by and large inhabited by tribes that subsist in part by hunting. The combined effects of habitat disturbance and hunting on the densities and biomass of Hose’s leaf monkey were studied in Kayan Mentarang National Park in Borneo’s far interior. Over four months, data on densities and hunting were collected by transect walks in four forest types. Hose’s leaf monkeys were hunted to deter crop-raiding, for their meat, and to obtain bezoar stones (visceral secretions used in traditional medicine). Hose’s... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Colobines; Conservation; Logging; Primates; Shifting cultivation. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/534367 |
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