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| Aldrich, B.C.; Molleson, L.; Nekaris, K.A.I.. |
| Titi monkeys (Callicebus), morphologically cryptic primates, have been difficult to survey using traditional sighting-based line transect methods. Callicebus-species regularly engage in loud, ritualized singing bouts, which could allow for the use of alternate, potentially more accurate call-based survey methods to monitor populations. The Andean titi monkey, C. oenanthe, is endemic to a small region of northern Peru, an area subject to widespread and rapid deforestation and human colonization. We conducted a call-based survey of C. oenanthe at Tarangue, a 74 ha private reserve near Moyobamba. Triangulation of calls was used to map groups of titi monkeys on and around the reserve. 73 mapped calls were used to estimate the presence of between three and... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Crypsis; Triangulation; Primates; Tropical Andes; Song; 42.84. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/269614 |
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| Eschmann, C.; Moore, R.; Nekaris, K.A.I.. |
| The study of calling patterns is a useful non-invasive method for determining population densities and the taxonomic relationships of rare or cryptic animal species. The Western purple-faced langur Trachypithecus vetulus nestor, endemic to Sri Lanka’s lowland rainforests, is severely impacted by forest fragmentation, with most remaining populations living almost completely in home gardens. Due to their shy nature, little is known about the behaviour of this subspecies; analysing the regular loud calls emitted by these langurs could allow for improvement of census techniques, clarification of their taxonomy, and an understanding of the impact of forest destruction on their behaviour. In 2007, we recorded the calling patterns of five male T. v. nestor at... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bioacoustics; Taxonomy; Colobinae; South Asia; Fragmentation; 42.84. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/280454 |
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| Nekaris, K.A.I.; Jaffe, S.. |
| Since the 1950s, Sundaland (Borneo, Java, Sumatra and their surrounding islands) was thought to be inhabited by a single slow loris species, the greater slow loris Nycticebus coucang. Early taxonomies as well as recent morphological and genetic studies, however, point to at least three species native to this region: N. coucang, N. menagensis, and N. javanicus. In the light of this taxonomy, all Sundaland slow lorises, previously considered Least Threatened, have been listed as Vulnerable or Endangered. Of particular concern is the fact that slow lorises are the most common protected primate species in the rampant Southeast Asian pet trade, resulting in their recent transferral to CITES Appendix I precluding all international commercial trade. Due to lack... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Indonesia; Java; Slow loris; Pet trade; Morphological variability; Taxonomy; Conservation; 42.82; 42.70. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/256131 |
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