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5 enero 2015 1 05 /01 /enero /2015 18:08
 The yellow-cheeked gibbon (Nomascus gabriellae), also called the golden-cheeked gibbon, yellow-cheeked crested gibbon, the golden-cheeked crested gibbon or the buffed-cheeked gibbon, is a species of gibbon native to Vietnam, Laos and Cambodia.
The yellow-cheeked gibbon (Nomascus gabriellae), also called the golden-cheeked gibbon, yellow-cheeked crested gibbon, the golden-cheeked crested gibbon or the buffed-cheeked gibbon, is a species of gibbon native to Vietnam, Laos and Cambodia.

Genetic studies show that gibbon ancestors diverged from the lineage leading to great apes and humans in South-East Asia about 6-9 million years ago. Gibbons are one of the most successful apes in terms of the number of species, especially in Vietnam with 7 species of gibbon from the genus Nomascus (The Crested gibbons), including the newly described species N. annamensis (2010).

Los estudios genéticos muestran que los antepasados de los gibones divergieron del linaje que llevó a los grandes simios y los seres humanos en el sudeste de Asia hace cerca de 6-9 millones de años. El gibon es uno de los simios más exitosos en términos del número de especies, sobre todo en Vietnam, con 7 especies de gibón del género Nomascus (Los gibones con cresta), incluyendo las especies recientemente descritas Nomascus annamensis (2010).

En Vietnam, la organización EAST trabaja con la especie más austral, el gibón de mejillas doradas (Nomascus gabriellae), que sólo se encuentran en el sur de Vietnam y Camboya. Como resultado de la destrucción de los bosques y la caza, la población silvestre de esta especie se estima en menos de 25.000 con la mayoría de la población sobreviviendo en Camboya.


Los gibones viven en pequeños grupos familiares, que consta de padres y sus hijos. Cada familia defiende una zona núcleo de 15 a 80 hectáreas de otras familias, para asegurar tener suficiente comida. Aunque tipificados originalmente como monógamos (emparejamiento de por vida), es evidente que existe una estructura social más flexible entre los gibones, de un macho con dos hembras o una hembra que llevan a cabo el apareamiento con un macho extra (apareamiento con otro además del macho residente).

Casi todas las mañanas al salir el sol toda la familia canta una canción a dúo de 12 a 15 minutos para informar a otros gibones de su ubicación y condición social. Esta canción no sólo es exclusiva de la especie, el macho y la hembra tienen sus propias piezas diferentes para hacer "arreglos" al cantar. La canción está dominada normalmente por el macho, pero si la disponibilidad de alimentos es buena o muchos grupos de gibones están cerca de la hembra, contribuirán al cantar de la dupla.

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Golden-Cheeked Gibbon Climbing in Vietnam

Vietnam fue "El paraíso de los gibones"

Golden-Cheeked Gibbons

Genetic studies show that gibbon ancestors diverged from the lineage leading to great apes and humans in South-East Asia about 6-9 million years ago.  Gibbons are one of the most successful apes in terms of the number of species, especially in Vietnam with 7 species of gibbon from the genus Nomascus (The Crested gibbons), including the newly described species N. annamensis (2010).

Genus Nomascus

Black crested gibbon, Nomascus concolor

  • Tonkin black crested gibbon, Nomascus concolor lu
  • Central Yunnan black crested gibbon, Nomascus concolor jingdongensis
  • West Yunnan black crested gibbon, Nomascus concolor furvogaster

Eastern black crested gibbon, Nomascus nasutus

  • Cao Vit black crested gibbon, Nomascus nasutus nasutus

Hainan black crested gibbon, Nomascus hainanus

Northern white-cheeked gibbon, Nomascus leucogenys

Southern white-cheeked gibbon, Nomascus siki

Northern buffed-cheeked gibbon, Nomascus assamensis

Golden-cheeked gibbon, Nomascus gabriellae

In Vietnam EAST works with the most southerly species, the Golden-cheeked gibbon (Nomascus gabriellae), which are only found in South Vietnam and Cambodia.  As a result of forest destruction and hunting, the wild population is estimated at less than 25,000 with the majority of the surviving population in Cambodia.
 

Female golden-cheeked gibbon Male golden-cheeked gibbon


They live in small family groups, consisting of the parents and their offspring.  Each family defends a core area of 15-80 hectares from other gibbon families, to ensure they have enough food.  Although classed originally as monogamous (pairing for life) it is clear that a more flexible social structure exists with one male to two females or females conducting extra pair mating (mating with other males than her resident male).

Most mornings at sunrise the whole family sings a short duet song of 12-15 minutes to inform other gibbons of their location and social status.  This song is not only unique to the species, the male and female have their own different parts to sing.  The song is dominated normally by the male, but if food availability is good or many other gibbon groups are near the female will contribute more to the duet.

At birth golden-cheeked gibbons have blonde fur, but by 2 years of age this changes to black.  Once they reach maturity at around 5 years of age, the females turn back to blonde whilst the males remain black with golden cheeks.  Each colour change takes about one year to complete.  The average life span of a golden-cheeked gibbon is 35 years.

Golden-cheeked gibbons have proved to be highly adaptable at living in disturbed secondary forest, feeding primarily on forest fruits with some leaf, flower and insects.  They have evolved to feed on the tips of branches, being light in weight and able to suspensory feed.

Gibbons in the wild are very timid, although they happily co-exist with doucs, they are afraid of the tougher, noisier macaques.

Indiscriminate snares catch many macaque species that travel on the ground.  For gibbons that are totally aboreal (living off the ground in the trees) they are most commonly hunted by gun or poison darts.  The gibbon morning call alerts hunters of their location.  When found whole families can be killed at once, as the male and young will stay near the mother, unwilling to break up the family unit.

In unprotected areas of forest in the Central Highlands of Vietnam, hunters passing by on the new highways with blow darts on their backs are a common sight.  Thankfully, with strengthened law enforcement and punishment, the risks of being caught hunting gibbons have increased, creating greater protection for this endangered species, but with growing tourism the building of more highways has opened up areas previously impenetrable to hunters.

Gibbons are hunted for the pet trade, tourist attractions, traditional medicene and illegal wild meat.  An analysis of information relating to our rescued gibbons at Dao Tien shows that the most common source are private restaurants and resorts, where they are held, usually in small cages for the entertainment of tourists.
 

Infant gibbons as young as six months of age, illegally kept at a private tourist attraction


 


You can make a difference, by avoiding tourist attractions that hold these beautiful intelligent primates.  Make a point of informing the owners before you leave of your objections and tell your friends to make a point of letting the owner know in the future and leave before spending a penny!  Please then report the sighting to the local authorities, daotien@go-east.org or to the ENV hotline: hotlin@fpt.vn.

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  • Malcolm Allison H malcolm.mallison@gmail.com
  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL
  • Biólogo desde hace más de treinta años, desde la época en que aún los biólogos no eran empleados de los abogados ambientalistas. Actualmente preocupado …alarmado en realidad, por el LESIVO TRATADO DE(DES)INTEGRACIÓN ENERGÉTICA CON BRASIL

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