Animal Info - Kloss' Gibbon
(Other Names: Beeloh, Dwarf Gibbon, Mentawai Gibbon, Siamang de Kloss, Siamang Enano)
Hylobates klossii
Status
:
Vulnerable
Contents
1.
Profile
(
Picture
)
2.
Tidbits
3.
Status and Trends
(
IUCN Status
,
Countries Where Currently Found
,
Population Estimates
,
History of Distribution
,
Threats and Reasons
for Decline
)
4.
Data on Biology and Ecology
(
Weight
,
Habitat
,
Gestation Period
,
Birth Rate
,
Diet
,
Behavior
,
Social Organization
,
Density and Range
)
5.
References
Profile
Pictures:
Kloss' Gibbon #1
(31 Kb JPEG) and
Kloss' Gibbon #2
(15 Kb JPEG)
(
Gibbon Res. Lab
)
Kloss' gibbon weighs about 6 kg (13 lb). It lives in tropical rain forest. All gibbons are
arboreal
and
diurnal
. Kloss' gibbon eats mostly fruit and animal matter. Kloss' gibbon is
monogamous
. A single young is born every 2 - 3 years. A group of Mentawai gibbons will "stake out" a
territory
in the forest which it actively defends against other groups of gibbons, to protect an adequate food supply.
Kloss' gibbon occurs on the islands of North and South Pagi, Sipora and Siberut in the Mentawai group of islands, West Sumatra,
Indonesia
. It is threatened by hunting and habitat loss due to deforestation, modernization and population growth.
Tidbits
*** An adult male Mentawai gibbon usually sings in the last hour before dawn. He sings every other day on average, and a song period can last anywhere from 10 minutes up to 2 hours. The male is able to demonstrate his confidence or willingness to defend his
territory
by the duration and complexity of his song.
(
Macdonald 1984
)
Status and Trends
Countries Where Kloss' Gibbon Is Currently Found:
2004: Occurs in
Indonesia
.
(
IUCN 2004
)
Population Estimates:
[Note: Figures given are for wild populations only.]
History of Distribution:
Kloss' gibbon occurs on the islands of North and South Pagi, Sipora and Siberut in the Mentawai group, West Sumatra,
Indonesia
(
IUCN 1968
)
. In 1987 it was still thought to occur on the same islands in the Mentawai chain and, although common locally, it was declining throughout most of its range.
Threats and Reasons for Decline:
Kloss' gibbon is currently threatened by hunting and habitat loss due to deforestation, modernization and population growth.
Data on Biology and Ecology
Kloss' gibbon weighs about 6 kg (13 lb).
Habitat:
Kloss' gibbon is found in tropical rain forest.
It is one of the species that live in both the
Sundaland
Biodiversity Hotspot
(
Cons. Intl.
)
and the Sumatran-Nicobar Islands Lowland Forests
Global 200 Ecoregion
.
(
Olson & Dinerstein 1998
,
Olson & Dinerstein 1999
)
7 - 8 months.
Birth Rate:
A single young is usually born. There are 2 - 3 years between births.
Diet:
Feeding time usually involves 72% on fruit and 25% on animal matter
(
Macdonald 1984
)
.
Behavior:
All gibbons are
arboreal
and
diurnal
.
Social Organization:
Kloss' gibbon is
monogamous
.
A group of Mentawai gibbons will "stake out" an area in the forest, its
home range
, which is large enough to provide a reliable food supply. The group will actively defend the core of this area, its
territory
, against other groups of gibbons. Conflict between groups is minimized because the resident male advertises the group's presence by singing a song to indicate his willingness to defend the group's
territory
.
Density and Range:
Density:
Range:
References
Burton & Pearson 1987
,
Cons. Intl.
,
Curry-Lindahl 1972
,
Fuentes 1997
,
Gibbon Res. Lab
,
IUCN 1968
,
IUCN 1994
,
IUCN 1996
,
IUCN 2000
,
IUCN 2003a
,
IUCN 2004
,
Macdonald 1984
,
Nowak & Paradiso 1983
,
Olson & Dinerstein 1998
,
Olson & Dinerstein 1999
,
Whittaker 2005
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Last modified: January 7, 2006;
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