Hylobates klossii

Status and Conservation. CITES Appendix I. Classified as Endangered on The IUCN Red List. Kloss’s Gibbon is protected under Indonesian law, but it occurs in only one protected area, Siberut National Park. The total population, based on limited survey effort using auditory sampling, is 20,000 - 25,000 individuals, with island totals of 18,210 - 21,345 for Siberut, 753 - 880 for Sipora, and 1680 - 1974 on North and South Pagai together (another estimate for these last two islands, using a transect-based approach, was 2029 individuals). The vast majority of the global population is believed to be in Siberut National Park, with 13,190 - 15,413 individuals, but this estimate is based on a survey of less than 0 - 1 % of the park and therefore needs to be viewed as preliminary. Total population decline of Kloss’s Gibbon may be ¢. 50 % since 1980. Threats include hunting, commercial logging, forest conversion for agroindustry, especially oil palm, and forest clearance and disturbance at the local scale. Selective logging is widespread across the distribution of Kloss’s Gibbon, but one study suggests that this may have limited impact on carrying capacity. Hunting pressure has been exacerbated by increased access to forested areas through logging infrastructure and a move away from traditional hunting methods in the use of guns. Infant Kloss’s Gibbons are often taken as pets by hunters after they kill a parent. Traded Kloss’s Gibbons mostly remain in the Mentawai islands but sometimes go to neighboring western Sumatra. Increased legal protection of the remaining populations, including those in the Peleonan Forest, increased commitment and planning for conservation from logging companies, and improved enforcement in Siberut National Park are key conservation interventions.

Sumber: Hylobatidae

Descriptive notes. Head-body 43.5 - 58.5 cm (males) and 42 - 58 cm (females); weight 5.7 - 8 kg (males) and 4.4 - 6.8 kg (females). Female Kloss’s Gibbonsare slightly smaller than males, but they have canine teeth that are similar in size. Kloss’s Gibbon is considered one of the smallest gibbons, although its body size is within the range observed in other species of Hylobates. Both sexes and all ages have completely black fur with no markings. Kloss’s Gibbon was originally described as a “ dwarf siamang ” due to its black fur, but morphologically it more closely resembles other species of Hylobates than the Siamang (Symphalangus syndactylus). One notable difference is that the fur is sparser than is typical of other species of Hylobates, and there is a nearly bare area on the throat. In some respects, the skull of the Kloss’s Gibbon also resembles that of the Siamang.

Sumber: Hylobatidae