Vietnamese: Hổ Đông Dương
|Subspecies:||P. tigris corbetti|
|Panthera tigris corbetti
|Distribution of the Indochinese Tiger (in red)|
The Indochinese tiger (Panthera tigris corbetti) is a tiger subspecies dispersed throughout the Indochina region of Southeastern Asia. In 2007, its population comprised less than 2,500 individuals with no subpopulations greater than 250 individuals, so the IUCN Red List of Threatened Species categorized the Indochinese tiger as Endangered. There is restricted access to border areas where this subspecies lives, so there is very little accurate information regarding its population status.
The Indochinese tiger population was formerly estimated at 202-352 total individuals in the wild, and had almost approached the threshold for Critically Endangered. However, as of 2015, the total population of Indochinese tigers has been estimated at 600-650 individuals in the wild.
The Indochinese tiger is generally smaller than Bengal and Siberian tigers. Males range in size from 2.55 to 2.85 m (8.4 to 9.4 ft) and in weight from 150 to 195 kg (331 to 430 lb). Females range in size from 2.3 to 2.55 m (7.5 to 8.4 ft) and in weight from 100 to 130 kg (220 to 290 lb). Its head is smaller than of the Bengal tiger; the ground coloration is darker with more rather short and narrow single stripes.
Distribution and habitat
Indochinese tigers are distributed in Myanmar, Thailand, Laos, Cambodia, Vietnam. In China, they occurred historically in the Yunnan province and Mêdog County in the country's southwestern part, where tigers may not be resident any more today. Tiger populations in historic range countries declined seriously. They have not been recorded in Vietnam since 1997. Available data suggest that there are no more breeding tigers left in Cambodia, Vietnam and China.
More than half of the total population is found in the Western Forest Complex in Thailand, especially in the area of the Huai Kha Khaeng Wildlife Sanctuary. Its habitat consists of tropical and subtropical moist broadleaf forests. Forests provide this tiger subspecies with camouflage, and its preference for mountainous regions provides them with hunting grounds that fit their lifestyle and dietary needs.
The above figures were collected during a meeting of the International Tiger Forum (‘Tiger Summit’), held in St. Petersburg, Russia, on 21–24 November 2010. Participants included representatives of 13 tiger range countries.
Ecology and behavior
The Indochinese tiger is a solitary animal. Due to its elusive behavior it is difficult to be observed and studied in the wild, so there is little knowledge about their behaviour.
Indochinese tigers prey mainly on medium- and large-sized wild ungulates. Sambar deer, wild pigs, serow, and large bovids such as banteng and juvenile gaur comprise the majority of Indochinese tiger’s diet. However, in most of Southeast Asia large animal populations have been seriously depleted because of illegal hunting, resulting in the so-called “empty forest syndrome” – i.e. a forest that looks intact, but where most wildlife has been eliminated. Some species, such as the kouprey and Schomburgk's Deer, are extinct, and Eld's Deer, hog deer and wild water buffalo are present only in a few relict populations. In such habitats tigers are forced to subsist on smaller prey, such as muntjac deer, porcupines, macaques and hog badgers. Small prey by itself is barely sufficient to meet the energy requirements of a large carnivore such as the tiger, and is insufficient for tiger reproduction. This factor, in combination with direct tiger poaching for traditional Chinese medicine, is the main contributor in the collapse of the Indochinese tiger throughout its range.
Indochinese tigers mate throughout the year, but most frequently during November through early April. After a gestation period of 3.5 months, roughly 103 days, a female Indochinese tiger is capable of giving birth to seven cubs. However, on average a female will only give birth to three. Indochinese tiger cubs are born with their eyes and ears closed until they begin to open and function just a few days after birth. During the first year of life there is a 35% mortality rate, and 73% of those occurrences of infant mortality are the entire litter. Infant mortality in Indochinese tigers is often the result of fire, flood, and infanticide. As early as 18 months for some but as late as 28 months for others, Indochinese tiger cubs will break away from their mothers and begin hunting and living on their own. Females of the subspecies reach sexual maturity at 3.5 years of age while it takes males up to 5 years to reach sexual maturity.
Their lifespan can range from 15 to 26 years of age depending on factors like living conditions and whether they are wild or in captivity. Due to their dwindling numbers, Indochinese tigers are known to inbreed, mating with available immediate family members. Inbreeding within this subspecies has led to weakened genes, lowered sperm count, infertility and in some cases defects such as cleft palates, squints, crossed-eyes, and swayback.
The primary threat to Indochinese tigers is mankind. Humans hunt Indochinese tigers to make use of their body parts for adornments and various Eastern traditional medicines. Indochinese tigers are also facing habitat loss. Humans are encroaching upon their natural habitats, developing, fragmenting, and destroying the land. In Taiwan, a pair of tiger eyes, which are believed to fight epilepsy and malaria, can sell for as much as $170. In Seoul, powdered tiger humerus bone, which is believed to treat ulcers, rheumatism, and typhoid, sells for $1,450 per pound. In China, the trade and use of tiger parts was banned in 1993, but that has not stopped poachers who can earn as much as $50,000 from the sale of a single tiger’s parts on the black market. With a growing affluence in countries where tiger parts are so greatly valued, demand is high.
Located in the Kachin State of Myanmar, the Hukaung Valley is the world's largest tiger reserve and is home to Myanmar's remaining Indochinese tiger population. Since 2006, the Yuzana Corporation's wealthy owner Htay Myint alongside local authorities has expropriated more than 200,000 acres of land from more than 600 households in the valley. Much of the trees have been cut down and the land has been transformed into plantations. Some of the land taken by the Yazana Corporation had been deemed tiger transit corridors. These are areas of land that were supposed to be left untouched by development in order to allow the region’s Indochinese tigers to travel between protected pockets of reservation land. The Burmese Civil War has been an ongoing conflict within the country of Myanmar since 1948. Because of renewed rebel uprising in 2011 from the Kachin Independence Army who occupy a portion of the Hukaung Valley, foreign poaching threats have been unable to safely enter the region. Not only are foreigners restricted from entering the region but reservation staff as well. Among indigenous people, particularly the impoverished, the Indochinese tiger is a valuable resource. Because of the danger of civil conflict, the reservation staff have had a difficult time protecting the tigers from the native population. In early January 2013, rumors of a ceasefire between the government and rebel forces began to circulate. The country’s leaders believed that a resolution could have been reached as early as October 2013. Having been unable to establish themselves as a protective force in the region, there is concern that foreign poachers will begin moving back into the soon to be peaceful region before the reservation staff.
Throughout out all ecosystems they inhabit, tigers are a top predator. When a top predator is in decline or even totally removed from an ecosystem, there are serious consequences that trickle down through the food web and disrupt the proper functioning of an ecosystem. They control population growth and decline and increase species diversity. William J. Ripple, a professor of forestry at Oregon State University made it clear that:
The data from Canada, Alaska, the Yukon, Northern Europe and Asia are all showing similar results. There's consistent evidence that large predators help keep populations of large herbivores in check, with positive effects on ecosystem health.
In the event of the extinction of the Indochinese tiger subspecies it is possible that prey populations would explode. As herbivorous populations increase, the diversity and productivity of native plant communities would decline substantially. Competition among species would also increase, causing some to dominate over others due to sheer population size. Species diversity would decline, and the ecosystem would be thrown completely off balance. Historically, other top predators have been removed from an ecosystem and similar effects were seen such as in the case of the Yellowstone National Park wolves.
Despite being illegal, the trade of tiger parts on the black market provides many poachers with substantial income. While it is an illegal and frowned upon profession, many poachers do what they do because they are impoverished and have limited options for obtaining a substantial and steady income otherwise.
Of all tiger subspecies, the Indochinese tiger is the least represented in captivity and not part of a coordinated breeding program. As of 2007, 14 individuals were recognized as Indochinese tigers based on genetic analysis of 105 captive tigers in 14 countries.
Prior to the designation of the Malay subspecies there were approximately 60 Indochinese tigers in Asian, European and North American zoos. Today there are less than a handful. Zoos are committed to conserving the genetic integrity of the subspecies that do exist in the wild.
The Indochinese tiger has been recognized as a distinct subspecies since 1968. It is also referred to as "Corbett's tiger" in honor of Jim Corbett. In the early 1900s Corbett, an avid hunter, was often called to regions of India to deal with "problem cats." While his work was initially dedicated to eradicating troublesome leopards and tigers from Indian villages, he eventually began to raise support and awareness for environmental and animal conservation.
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