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Hope to see you Tomorrow...!

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posted by Connie Lemperle alias Connie Lemperle on Tuesday 25th of August 2009 02:21:48 AM

© All Rights Reserved - No Usage Allowed in Any Form Without the Written Consent of Connie Lemperle/ lemperleconnie or the Cincinnati Zoo & Botanical Garden Link to the Cincinnati Zoo's Website.............. Cincinnati Zoo Siamang The Siamang inhabits the forest remnants of Sumatra Island and the Malay Peninsula, and is widely distributed from lowland forest to montane forest, even a rainforest. And can be found at altitudes of up to 3800 m [5]. The Siamang lives in groups of up to 6 individuals (4 individuals on average) with a home range 23 hectares on average.[6][7]. Their day ranges are substantially smaller than those of sympatric Hylobates species, often less than 1 km[8]. The Siamang's melodious choir singing breaks the forest's silence in the early morning after the Agile Gibbon or Lar Gibbon's calls. The Siamang in Sumatra and the Malay Peninsula are similar in appearance, but there are some differences in behaviour between the two populations. Diet The Siamang mainly eats various parts of plants. The Sumatran Siamang is more frugivorous than its Malayan cousin, with fruit making up to 60% of its diet. The Siamang eats at least 160 species of plants, from vines to woody plants. Its major food is figs (Ficus spp.), a member of Moraceae family.[7][9] The Siamang prefers to eat ripe fruit rather than unripe fruit, and young leaves rather than old leaves. It eats flowers and a few animals, mostly insects. When the Siamang eats large flowers, it will eat only the corolla (petal), but it will eat all parts of smaller flowers, with the small fruit collected in its hand before being consumed. When it eats big and hard seeds or seeds with sharp edge it will peel out the fruit flesh and throw away the seed.[9] Although its diet consists of substantial portions of fruit, it is the most folivorous of all members of Hylobatidae[10]. As it is also the largest gibbon, and thus fits well with the general primate dietary trend in which larger primates tend to be more folivorous. Demography and population A group of Siamang normally consist of an adult dominant male, an adult dominant female, with offspring, infant and sometimes a sub-adult. The sub-adult usually leaves the group after the age 6 to 8 years; sub-adult females tend to leave the group earlier than sub-adult males. Siamang males tend to offer more paternal care than other members of the family Hylobatidae, taking up a major role in carrying the infant after it is about 8 months old [12]. The infant typically returns to its mother to sleep and nurse. A study in relation to effect of habitat disturbance on the Siamang found that group composition is varied in age-sex structure between intact forest and post-burnt forest. The post-burnt population was more adult and sub-adults than the intact population. Post-burnt groups contain fewer infants, small juveniles and large juveniles compared to intact forest groups. Infant survival rates in post-burnt groups are lower than in intact forests. The number of individuals in intact forests is higher than in post-burnt forests.[7] The Siamang in disturbed forests live in small groups and have a density lower than in intact forests because of lack of food resources and trees for living. In the 1980s, the Indonesian population of the Siamang in the wild was estimated to be 360,000 individuals.[13] This seems over-estimate today, as an example, Bukit Barisan Selatan National Park (BBSNP) is the third largest protected area (3,568 km²) in Sumatra, of which approximately 2,570 km² remains under forest cover inhabit by 22,390 siamangs (in 2002 censuses). According to two different research projects conducted in Sumatra, the Siamang prefer to inhabit lowland forest below between 500 m in altitude and over 1000 m above sea level. Behavior The Siamang tends to rest for more than 50% of its waking period (from dawn to dusk), followed by feeding, moving, foraging and social activities. It takes more rest during midday, taking time to groom each other or play. During resting time it usually uses a branch of a large tree lying on their back or on their stomach. Feeding behaviors, foraging, and moving are most often in the morning and after resting time. In the dry season the length of the Siamang's daily range is longer than in the rainy season. The Siamang in southern Sumatra undertakes less foraging than the Siamang in other places because it eats more fruit and therefore consumes more nutrition, which results in less time needed for looking for food. Sometimes the Siamang will spend all of the day in one big fruiting tree, just moving out when it wants to rest and then coming back again to fruiting trees. Role of calling The Siamang starts its day by calling in the early morning and calls less after midday, with the peak of their calls around 9:00 am to 10:00 am. Most of the Siamang's calls are directed to its neighbours rather than to inside its home range. This means that the Siamang's calling is in response to disturbances and is to defend its territory. Calls in the late morning typically happen when it meets or sees another Siamang group. The edge of the Siamang's home range, which may overlap another, is often the places where calling is made. Counter-call (co-response calling) occasionally happens near the border or in the overlap area. Calls are numerous when fruit is more abundant rather than when fruit is less available. Branch shaking, swinging, and moving around the tree crowns accompany the calling. This movement might be to show the other groups where they are. The Siamang prefers calling in the living, high and big trees, it might be the places where another group is easy to see. Beside that, living, big, and tall trees can support Siamang movement. Calling trees are usually near feeding trees but sometimes they call in the feeding trees. Siamang and their habitat As a frugivorous animal, the Siamang disperses seeds through defacation as it travels across its territory. The Siamang can carry seed and defecate over 300 m with the shortest distance being 47.6 m from the seed resource, which supports the forest regeneration and succession. Threats to population The Siamang, as an arboreal primate, absolutely depends on the forest for existence, needing trees for its living. At the moment, the Siamang is facing a population decrease due to habitat loss[6], poaching and hunting. Habitat loss A major threat to the Siamang is habitat loss due to plantation, forest fire, illegal logging, encroachment, and human development. Firstly, palm oil plantations have removed large areas of the Siamang's habitat in the last four decades. Since 2002 107,000 square kilometres of palm oil have been planted,[17] which has replaced much rainforest in Indonesia and Malaysia, where the Siamang originally used to live. Secondly, in the last two decades, forest fire destroyed more than 20,000 km² of Sumatran rainforest, mainly in the lowland area where most of the Siamang live. Thirdly, the rate of illegal logging in Indonesia increased from 1980 to 1995 and even more rapidly after the reformation era beginning in 1998.[17] These illegal activities devastated the remaining tropical rainforest especially in Sumatra. Fourthly, forest encroachments change forest cover into cultivated land, for example; the rising price of coffee in 1998 has been encouraging people in Sumatra to replace the forest with coffee plantation.[18] Fifthly, development in many areas needs infrastructure such as roads, which now divide a lot of conservation areas have been caused forest fragmentation and edge effects. Unfortunately, the Siamang as an arboreal primate faces difficulty because road establishment has disconnected their pathways. Poaching and hunting Unlike other parts of Asia, primates are not hunted for their meat in Indonesia (the exception is in Chinese restaurants in Indonesia which sometimes serve macaque on their menu). However, they are poached and hunted for the illegal pet trade, mostly for infant Siamang. Poachers kill the mothers because mother Siamang are highly protective of their infants. It is therefore very difficult to remove the infant without first killing the mother. Despite the fact that most Siamang on the market are infants many infants nevertheless die during transportation Note___________________________________________________________ I know the above is a lot to read so don't worry about reading it unless you really want to. I like to post information about an animal in case someone is interested in it. I'm posting and than going to bed. I'm so sorry if I missed any of your beautiful photos and will try to catch up. Just been a busy girl! I have to take Teebo to the Vet tomorrow for his yearly checkup and than I'm meeting my sister and some friends to see a movie. Haven't done that in awhile. I hope you all have a very nice Tuesday and week. Hope to see you tomorrow! Sweet dreams and Good Night!

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