2023 |
Widyastuti, Salmah; Perwitasari-Farajallah, Dyah; Iskandar, Entang; Prasetyo, Lilik B.; Setiawan, Arif; Aoliya, Nur; Cheyne, Susan M. Population of the Javan Gibbon (Hylobates moloch) in the Dieng Mountains, Indonesia: An updated estimation from a new approach Journal Article In: Biodiversity Data Journal, vol. 11, 2023, ISSN: 13142828. Abstract | Links | BibTeX | Tags: ASCR, density, point count, population size, triangulation @article{Widyastuti2023a, The Javan gibbon (Hylobates moloch) is endemic to the island of Java and its distribution is restricted from the western tip of Java to the Dieng Mountains in Central Java. Unlike the other known habitats that hold a large population of Javan gibbons, the Dieng Mountains have not been protected and experience various threats. This study, which was conducted in 2018 and 2021, aimed to provide an update of the current density and population size of Javan gibbons in Dieng after the most recent study in 2010 and to investigate their relationships with habitat characteristics (vegetation and elevation). The triangulation method and a new acoustic spatial capture-recapture method were used to estimate group density. A new approach for extrapolation, based on the habitat suitability model, was also developed to calculate population size. The results show that the Javan gibbon population in the Dieng Mountains has most likely increased. The mean group density in each habitat type was high: 2.15 groups/km2 in the low suitable habitat and 5.55 groups/km in the high suitable habitat. The mean group size (3.95 groups/km2 |
2020 |
Repi, Terri; Masy'ud, Burhanuddin; Mustari, Abdul Haris; Prasetyo, Lilik B Population density, geographical distribution and habitat of Talaud bear cuscus (Ailurops melanotis Thomas, 1898) Journal Article In: Biodiversitas, vol. 21, no. 12, pp. 5621-5631, 2020. Abstract | Links | BibTeX | Tags: Ailurops melanotis, conservation, density, distribution, habitat, population @article{Repi2020, The Talaud bear cuscus (Ailurops melanotis) has been reported from Sangihe (the largest island in the Sangihe Island group) and Salibabu (within the Talaud Islands). As an endemic species of Indonesia, this species is rare and there is no certainty regarding its precise geographic distribution or population size. This research aimed to estimate population density and provide the first preliminary data on its geographical distribution, as well as general description of its habitat. Our research shows that A. melanotis occurs on three islands: Salibabu Island, Nusa Island, and Bukide Island, and probably also exists in the Sahandaruman mountain on Sangihe Island. Our population surveys estimate, population density on each island as: Salibabu: 3.69 ± 2.54 ind/km2, with an estimated total population of 28.95 individuals, Nusa Island: was 12.31 ± 2.58 ind/km2, with an estimated population of 19.08 individuals, and Bukide Island: 7.17 ± 1.79/km2, with an estimated population of 10.40 individuals. Information regarding population is a key guiding factor in conservation efforts, where population size is related to extinction risk (threat status) and its geographical distribution, this can help to determine conservation priorities for species or habitats. |
2023 |
Population of the Javan Gibbon (Hylobates moloch) in the Dieng Mountains, Indonesia: An updated estimation from a new approach Journal Article In: Biodiversity Data Journal, vol. 11, 2023, ISSN: 13142828. |
2020 |
Population density, geographical distribution and habitat of Talaud bear cuscus (Ailurops melanotis Thomas, 1898) Journal Article In: Biodiversitas, vol. 21, no. 12, pp. 5621-5631, 2020. |