Yartsa Gunbu (Cordyceps sinensis) and the Fungal Commodification of Tibet’s Rural Economy
Yartsa Gunbu (Cordyceps sinensis) and the Fungal Commodification of Tibet’s Rural Economy. Cordyceps sinensis is a mushroom that parasitizes larvae of Thitarodes (Hepialus) moths, which inhabit the alpine grasslands of the Tibetan Plateau. Tibetans have used the mushroom, which they call yartsa gunbu (“summer-grass, winter-worm”) for many centuries, if not millennia. A 350% increase in the price paid to pickers between 1997 and 2004 has turned this tiny mushroom into the single most important source of cash for rural households in contemporary Tibet. On average, 40% of the rural cash income in the Tibet Autonomous Region is derived from its collection, which government statistics figured at 50,000 kg in 2004, contributing at least CNY (Chinese yuan) 1.8 billion (USD 225 million) to the Tibet Autonomous Region’s GDP. A dramatic fungal commodification of the rural Tibetan economy is occurring, as the income from sale of Cordyceps often accounts for 70%–90% of a family’s annual cash income in areas where it grows. The ever-increasing harvesting pressure raises the question of sustainability. The fact that Cordyceps has been collected for centuries and is still common argues for its resilience, but the lack of harvest studies for C. sinensis precludes a definite answer as to whether the harvest can be sustained at its current level.
Key WordsCordyceps grassland products medicinal mushrooms mushroom harvest mushroom income rural Tibet Tibet AR Tibet GDP Tibet income
In this world sexual desire is
The most marvelous of all earthly pleasures,
The essence of the enjoyment of all the senses...
As to this medicinal substance:
It grows in regions of beautiful mountains
Such as remote grassland mountains.
In the summer it is a blade of grass [growing] on a worm
Similar to the leaf of mountain garlic.
The flower resembles a silken green sedge.
The root resembles cumin seed at the end of autumn.
The taste is sweet and a little astringent.
The post-digestive [taste] is sweet and the quality is oily.
It has a slight warming quality.
It removes prana diseases, cures bile diseases and does not raise the phlegm; a marvelous medicine.
In particular, it especially increases semen.
It is a flawless treasure of an ocean of good qualities.
By contrast, the first record in China seems to be more than 200 years later in Wang Ang’s 1694 compendium of material medica, Ben Cao Bei Yao (Grace Yue, pers. comm. 2005); a recent claim by Halpern (1999) that Cordyceps sinensis was mentioned in Chinese texts from the 8th-Century Tang Dynasty has not been substantiated.
According to Gawä Dorje (1995), another name for Cordyceps sinensis in Tibetan medicine is tsa daji (Wylie 1959: tswa da byid). A medicine known as daji (not tsa daji, however) is mentioned even earlier in the fundamental Tibetan medical text Gyü Zhi (also known as the “Four Tantras;” Wylie 1959: rgyud bzhi), composed between the 8th and 11th centuries and frequently republished (e.g., Yutog 2002). However, the identity of daji as Cordyceps remains controversial.
In traditional Chinese medicine, the caterpillar fungus is mostly used as a tonic. According to Liu (1994), its main applications are for treating exhaustion, respiratory and pulmonary diseases (e.g., tuberculosis, asthma), renal, liver, and cardiovascular diseases, back pain, and sexual problems (e.g., lack of sex drive, premature ejaculation). Its use as an aphrodisiac seems to be the driving force with male consumers in China, or at least that is the perception of Tibetan harvesters, who often make a point of saying that they, by contrast, have no need to take it for this purpose (!).
In a recent treatise on Tibetan medicine (Gawä Dorje 1995), Cordyceps (referred to as yartsa gunbu) is placed in the category of tsi men (Wylie 1959: rtsi sman), the “medicinal essences,” which includes several tonics. It is recommended as a general tonic, for boosting the immune system and virility, and is prescribed, usually in conjunction with other medicines, for kidney, lung, and heart problems, as well as for Hepatitis B; nowadays it is also frequently mentioned as improving eyesight. For an overview of modern research on C. sinensis, including possible anti-tumor, anti-cancer, and anti-viral activity, immuno-modulating, cholesterol-reducing and anti-oxidant effects, and potential to increase stamina and libido, see Zhu et al. (1998), Holliday and Cleaver (2004), and Canney (2006).
With the recent advent of a cash economy in the Tibet Autonomous Region (Tibet AR), the collection and sale of economically valuable mushrooms have gained increasing importance. Cordyceps sinensis is by far the most profitable mushroom on the Tibetan Plateau. It is the most widely distributed of Tibet’s economically important wild mushrooms because it occurs in grasslands, the environmental basis for livestock herding. In contrast, most other commercially-collected wild mushrooms in Tibet are restricted to forested areas, including the matsutake, Tricholoma matsutake (Ito & Imai) Singer, and morels (Morchella spp.). Much of the recent research on Cordyceps sinensis, as well that on other economically valuable grassland products, such as Fritillaria bulbs, Rhodiola roots, and Saussurea plants, can be found under the acronyms NWFPs for “non-wood forest products” (e.g., Bhattarai 1995; He and Sheng 1995; Boa 2004) and NTFPs for “non-timber forest products” (e.g., Zhang et al. 2001; Winkler 2003). Both acronyms are misnomers, since these products do not come from forests. The grasslands of the Tibetan Plateau provide many wild medicines and foods that, in terms of their economic importance, have come to rival traditional livestock products such as butter, milk, yogurt, meat, wool, and hides. In the absence of an adequate collective term for the wild plants and mushrooms harvested in these extensive grassland areas, I feel compelled to coin a new acronym, NLRPs, for “non-livestock rangeland products.”
Most data presented in this paper were collected during a June 2005 research project in cooperation with Luorong Zhandui and assisted by Dawa Tsering, both from China’s Tibetology Research Center in Beijing. Semistructured interviews were carried out on site with Cordyceps collectors and dealers, and with administrators from county and prefecture government offices in Nyingchi, Chamdo, Nagchu, and Lhasa prefectures (note: alternate spellings for Tibetan place names are given in Appendix); these four prefectures combine to produce nearly 90% of Tibet AR’s Cordyceps. A total of 55 individuals were interviewed in 2005 and another 35 in June and July of 2006. Dealers and collectors were chosen haphazardly at collection sites and in yartsa gunbu markets. Additional information was collected by the author during 15 previous visits to Tibet since 1998 while carrying out work related to rural income generation, forestry, non-timber forest products, non-livestock rangeland products, and other natural resources. Published literature, including Tibetan and Chinese sources, was also consulted to integrate the research data and draw a more complete picture of the significance of Cordyceps in the lives of contemporary rural Tibetans.
The Ecology of Cordyceps sinensis
Cordyceps is a genus of mostly entomophagous flask fungi (Pyrenomycetes, Ascomycotina) in the family Clavicipitaceae. Thirty-three species of Cordyceps sensu lato have been recognized in the Tibetan Plateau and Himalayan region (Zang and Kinjo 1998), but only a few are collected for their medicinal properties. The best known and most commonly used is Cordyceps sinensis, but Zang and Kinjo have described several distinct, closely-related species (C. gansuensis K. Zhang, C. Wang & M. Yan, C. kangdingensis M. Zang & Kinjo, and C. nepalensis M. Zang & Kinjo) that in the past have been mistaken for C. sinensis. A recent molecular study by Sung et al. (2007) concluded that Cordyceps should be divided into three genera, with C. sinensis belonging to the largest of the three, Ophiocordyceps. It remains to be seen if this new designation will be accepted, because C. sinensis is an economically important species; there is ample precedent for retaining its better-known name, as used here.
Its Caterpillar Hosts
Though the Tibetan name for C. sinensis is yartsa gunbu (“summer-grass, winter-worm”), it is commonly referred to simply as bu (“worm” or “insect”). The full name describes the main life stages of Cordyceps sinensis: its infected caterpillar host passes the winter (gun) in the soil as a “worm” (bu, pronounced “boo” as in “book”); then in early summer (yar) the mushroom or “grass” (tsa) emerges above ground. The word tsa is usually translated as grass, but can also be used to denote some mushrooms.
Cordyceps sinensis parasitizes various grass root-boring Thitarodes (Hepialus) caterpillars (Fig. 2), which hatch as “ghost moths” when not preempted by Cordyceps. Thirty of the nearly 40 species of Thitarodes known from the Tibetan Plateau can be infected by Cordyceps sinensis (Chen et al. 2000). Many of the regional differences in size of the Cordyceps mushroom are probably caused by size differences in the host species. While the normal reproductive cycle for Thitarodes species takes up to five years, most of the life cycle is lived as a caterpillar; the whitish adult moth lives for only a few days in order to mate.
Uninfected larvae typically hibernate deeper in the soil than infected ones; apparently the fungus is able to force the infected host to situate itself nearer the soil surface in a position more favorable to its fruiting. The hyphae of the mycelium develop inside the body of the insect, first feeding on less vital parts before taking over the complete organism. Eventually the insect is completely mummified and emptied of nutrients, and all that remains is the exoskeleton filled and coated with Cordyceps mycelium. In spring, the mushroom (also known as the fruiting body or stroma) develops out of the head of the exoskeleton just above the eyes. The slender, brown, club-shaped fruiting body then emerges from the ground, reaching a total length of 8–15 cm. It is typically nearly twice as long as its caterpillar host, but in rare cases can be up to four times as long.
Distribution, Habitat, and Season
Omnipresent grazing by livestock keeps the grass and herbs short, making the small fruiting bodies much easier to find during the collecting season. Tibetan collectors report that fruiting of Cordyceps sinensis is enhanced by unusually high precipitation during the preceding monsoon season or in the form of winter snowfall, especially when followed by mild temperatures in the spring. However, if snow cover remains for longer than a few days during the harvest season, Cordyceps fruiting bodies decay and much of the harvest is lost.
The known range of C. sinensis includes all but the driest portions of the Tibetan Plateau. Administratively this encompasses vast areas of Tibet AR, as well as adjacent areas within the Tibetan autonomous prefectures of Sichuan, Yunnan, Qinghai, and Gansu provinces. It is also found in some mountainous areas of southwestern Sichuan and northern Yunnan that are inhabited by other ethnic minorities. Reports of it from the central and eastern Himalayas (Nepal, Bhutan, and India) are difficult to verify because of confusion with other Himalayan species, such as C. nepalensis (Zhang and Kinjo 1998). C. sinensis has also been reported from Tian Shan and Altai Shan in Xinjiang province of northwestern China (Zhang and Kinjo 1998).
On the Tibetan Plateau, C. sinensis occurs at altitudes of 3,000 to 5,000 m, but only where average annual precipitation is at least 350 mm and usually more than 400 mm. In the arid reaches of the northwestern Tibetan Plateau, where annual precipitation is below 300 mm, C. sinensis is apparently absent. It generally occurs within an altitudinal range of 600–1,000 m. This distribution zone can be correlated to an amplitude of 400–500 m above and below the treeline, or more accurately the potential treeline, since the actual treeline has been greatly altered by deforestation and other human activities. The potential treeline is highest in central Tibet (4,600–4,800 m) and lowest (3,500 m) in the northeastern portion of C. sinensis’ distribution (eastern Qinghai and Western Gansu provinces). Over the millennia, forests have been replaced by pastures in wide areas of the Tibetan Plateau (Winkler 1998, 2000; Miehe et al. 2006); thus Tibetan pastoral activities have clearly extended the habitat of Cordyceps sinensis. However, in general the downward distribution does not exceed 400–500 m into previously-forested areas.
The Commercial Harvest of Cordyceps sinensis
Each year as the high elevation grasslands spring to life, Tibetans venture out to look for yartsa gunbu. In eastern Tibet, the season begins in April or May, whereas in central Tibet it occurs after the onset of the summer monsoon (usually June) and may last into July in the drier, high-elevation areas. In any given locality, the collection season typically lasts for about a month, but a sharp elevation gradient can extend a locality’s season by several weeks since the higher slopes tend to fruit later than the lower ones.
The high altitude grasslands and shrublands are vast (Fig. 5), and individual specimens of bu do not occur in the groups or “patches” characteristic of many ectomycorrhizal mushrooms. Not only are they widely dispersed, but also the visible (epigeous) portion of the organism is very small (4–12 cm) and can only be spotted at close range. As a result, the search for bu is intensive as well as extensive, and ground that has already been searched is not necessarily devoid of bu.
Most collectors use a knife or small hoe to dig the bu out of the ground. This needs to be done carefully, since the Kobresia turfs are very dense, and breaking off the Cordyceps fruiting body from the head of the larva greatly reduces its value. Collectors dig bu whenever they encounter it. However, the caterpillar fungus is more valuable when young, that is, before it sporulates or early during sporulation. In the final stages of sporulation, the host larva becomes soft and undesirable, and the upper part of the mushroom sometimes splits. The price of a specimen depends mostly upon the size of the larval host: the bigger, the better. By contrast, the length of the fruiting body (mushroom) is of little significance except for exceptionally long specimens, which are regarded as inferior and may even be cut shorter. The healing power of yartsa gunbu is believed to be concentrated in the caterpillar, which is indeed filled with Cordyceps mycelium. Firmness of the larva is thus important in pricing; collectors and dealers often squeeze the larva between their fingers to assess quality. Dealers also pay attention to the caterpillar’s color: a saturated yellowish-brown is preferred to paler tones.
A person’s typical daily harvest ranges from a few specimens to several dozen, and rarely as many as 100. During interviews with collectors in Riwoche and Dengchen counties, both in Chamdo Prefecture, I was frequently told that 5 to 10 specimens a day was average, and that 20 was considered very good. Using the official statistics for Dengchen County, the average collection rate comes to 10 specimens per person per day, and the average annual harvest of about 5000 kg represents some 12 million specimens collected by 35,000 people over approximately 30 days. In 2004, a single bu was worth about CNY 8–16 (USD 1–2) to the collector. In comparison, a seasonally available manual job in road construction or other rural labor would generate only CNY 15–25 (roughly USD 2–3) per day. Thus a typical day’s harvest of 5–10 bu represents some three to seven times the typical daily wages in the region, and an unusually good day’s harvest could produce income equivalent to a month or more of wage labor.
Collection Pressure and Permits
Most of the collectors interviewed complained that each year there are more people collecting. To date, however, the increasing value of bu has compensated for the increased competition and reduced individual harvest. The dramatic economic impact of bu collection is exemplified in Dengchen County, Chamdo Prefecture, where a local official in charge of bu collection stated that 60% of its 63,000 inhabitants had been mobilized by county government intervention to collect bu in 2005, and that bu collection was the single most important source of money in the county. Though most counties have not yet made similar organized efforts, the recognition of bu’s economic importance is spreading.
Most counties in Tibet require collecting permits for local residents, with typical costs ranging from CNY 10 to CNY 300 (USD 1.3–38) per person per season. Nonlocal collectors, or “outsiders,” currently pay significantly higher fees than locals. In the 1990s, permits for outsiders were either not required, were very cheap (CNY 10–30, USD 1.3–3.8), or were not enforced. However, in recent years most bu-producing counties have imposed steadily-increasing permit fees on outsiders, in many cases outpacing the actual price increase for bu. In 2005, collection permits for outsiders ranged from CNY 300–1,500 (USD 38–200) per person for the one-month season. In 2006, the most expensive “outsider” permit, costing CNY 4,000 (USD 500), was in Golok Prefecture, Qinghai Province.
“Outsiders” include Tibetans from neighboring counties and prefectures: for example, in Nagchu and Nyingchi prefectures, most Tibetan outsiders come from Shigatse Prefecture, which has a large population but is relatively poor in economically valuable plants and mushrooms. Non-Tibetan collectors also arrive for the collecting season, notably Hui Muslims from northeastern Qinghai and Gansu provinces who come by the thousands, in some places outnumbering the local population during collection season (Winkler 2005). There is no overall policy for nonlocal collectors, but in recent years, counties have become stricter in regulating access to outsiders. Some counties, such as Riwoche and Dengchen, have phased out permits for outsiders and declared a complete ban on bu collecting by nonresidents. Such bans as well as dramatic increases in permit fees have led to unrest and even riots with some fatalities in 2004 and 2005, such as in Dzato County (Zaduo Xian, Yushu Prefecture, Qinghai; ENS 2005), and also, according to local sources, in Gyamda Kongpo County, Nyingchi Prefecture, Tibet AR in 2005, and Dengchen County in 2004 and 2005.
Many county officials that I interviewed noted that permit recipients, both local and nonlocal, are instructed in how to minimize grassland destruction while digging bu, for instance, by closing up the holes created by digging, by keeping tent sites clean, and by not using local vegetation as fuel for campfires. Dengchen County even specifies that the size of the hoe used for digging bu cannot exceed 5 × 15 cm. Many county officials explained that the money generated by permit fees is used for environmental protection, by which they mean clean-up after the collecting season. However, campsites that I visited at the close of the season in Dengchen County (Richu Valley, Seda Xiang) were marked by empty and broken beer bottles, discarded instant noodle containers, and plastic bags, so I could not verify that such clean-up of the campsites was actually taking place.
The Sale of Cordyceps
Three main factors enable rural households to participate successfully in the harvest of yartsa gunbu: 1) the widespread knowledge about bu and how to find it; 2) access to the grasslands where it grows; and 3) the fact that little or no capital is needed to participate, at least for locals. In other words, resource access is assured and the usual barriers to economic success (lack of formal education or access to credit) are absent. As a result, within the distribution area of bu, nearly all rural households who practice traditional subsistence herding and agriculture also participate in bu collection (see also Winkler 2003).
Typically, small quantities of bu are sold after seller and buyer have agreed on a price per specimen and the bu have been counted by both parties. In June 2005, prices in Tibet ranged from CNY 3–30 (USD 0.4–3.8) per specimen. This price range is roughly equivalent to CNY 10,000–60,000 (USD 1,250–7,500) per kg figured at 1,800 large bu or 3,600 small bu per kg). Collectors have several choices of where to sell. Some sell the freshly collected bu right on the grasslands or in the collectors’ camps. This is often done early in the season to generate some quick cash to pay for living expenses in the camps. But by selling small, unprocessed (i.e., uncleaned) quantities on the grasslands, collectors forgo 10–30% in profit, since this is the range of the common mark-up for cleaned bu sold in larger quantities to itinerant bu dealers who ply the roads. At this point, bu is sold by the piece rather than weight, since they are not fully dried yet.
Market Control and Brokering
Lhasa now has about 15 large brokers of bu who buy from smaller brokers or middlemen, a business entailing multimillion-yuan transactions. These large brokers also maintain a network of buyers, sometimes family members, in prefecture towns such as Nyingchi’s Bayi, Shigatse, and Lhoka’s Tsetang. Native Tibetan brokers control less than half of the approximately 30,000 kg of bu dealt annually in Lhasa. Instead, bu brokering in Lhasa is dominated by Hui Muslims, many of them originally from Gansu Province, to the northeast of Tibet. Hui brokers in Lhasa typically sell their bu to even larger Hui brokers in Xining (Qinghai Province). When asked why they dominate bu brokering in Lhasa, one Hui broker replied that the Hui are clever at business, willing to take risks, and have a close network in their communities. A successful Tibetan broker answered similarly: “The Hui have an advantage due to their reliable business relationships, and most Lhasa Tibetans lack the guts for this high-stakes business.” There are regional differences, however, in brokering and market share. In eastern Tibet (i.e., Chamdo Prefecture), the market is controlled by native Khampa Tibetans, who prefer selling their bu to other Tibetans, and who are renowned in Tibet for their willingness to take risks. Several Hui dealers in Lhasa even reported losing market share to Khampa brokers.
Cordyceps trade between Tibet and China goes back at least to the 17th century and probably much further. For Tibetans, it was an important bartering item for obtaining tea, a mainstay in the Tibetan diet, as well as silk (Winkler 2005). Dried Cordyceps—being so valuable, small, and light in weight (<0.2–0.5 g per specimen)—has functioned traditionally as a form of currency and still does today. During the commune period (1956–1981), Cordyceps collection was marshalled by state-decreed quotas that had to be fulfilled. A typical quota was three specimens per person per day for each household during the collecting season, handed over to local authorities. Surplus collection above the quota levels was traded. During the Cultural Revolution (1966–1976), the Cordyceps market collapsed (as it did for many other products). For example, in the 1970s, 1 kg of bu was traded for CNY 21 (less than USD 3) in Xining, Qinghai Province (Wen 2004), an extremely low price by today’s standards even after inflation is taken into account.
Yartsa gunbu wholesale price development in Lhasa (Tibet Autonomous Region) and Litang (Ganzi Tibetan Autonomous Prefecture, Sichuan).
Litang big size
Litang big size
Lhasa annual price increase
Local Income Generation and Contribution to GDP
Selected Tibetan county-level per capita income fromyartsa gunbu, based on officially reported harvest quantities and actual rural market prices in 2004.
Yartsa Gunbu Harvest (kg)
Official Average Income
Yartsa Gunbu Income per Capita
At CNY 22,000 per kg
Percentage of Official Income
Turning from local to national records, the reported harvest of yartsa gunbu in Tibet AR was 50,000 kg in 2004. Using the conservative producer’s price of CNY 22,000/kg, this amounts to a value of CNY 1.1 billion (USD 133 million in 2004), an overall per capita income contribution of CNY 463 (USD 58) to the approximately 2.4 million rural and small town inhabitants who account for 92% of Tibet’s total population. Thus, yartsa gunbu harvest would represent about 25% of the total per capita income of CNY 1,861 (USD 248) reported in 2004 for rural and small town Tibet (Tibet Statistical Yearbook 2006). Discounting noncash income (which is included in government statistics), yartsa gunbu harvest accounts for about 40% of the cash income for all of rural Tibet AR, including nonproducing regions. It is clear, then, that the yartsa gunbu harvest is a major driving force in the Tibetan rural economy.
So far, Tibetan and Chinese administrators, statisticians, and economists have not specifically examined the value contributed by the yartsa gunbu industry to Tibet AR’s gross domestic product (GDP). Because of the aggregate nature of official income reporting, it is not clear where or even if this industry is included in the income categories of the Tibet Statistical Yearbook (2006). Using the wholesale price in Lhasa of CNY 36,000/kg as a basis for calculation, the yartsa gunbu industry would represent a contribution of CNY 1.8 billion (USD 225 million) to Tibet’s economy, accounting for 8.5% of the total 2004 GDP of CNY 21.1 billion. The contribution of yartsa gunbu surpasses the entire secondary economic sector (industry and mining), valued at CNY 1.5 billion, and amounts to over 40% of the total primary sector (agriculture, livestock, forestry, etc.), valued at CNY 4.3 billion. By comparison, matsutake production in 2004 contributed CNY 30–40 million to the overall rural income in Tibet AR, or just 2–3% of the estimated contribution made by yartsa gunbu (Winkler n.d.). (As already noted, however, the grasslands where yartsa gunbu grows are far more extensive in Tibet than the evergreen oak forests favored by matsutake.)
Annual Production and Sustainability
The output ofyartsa gunbuin kg in the producing prefectures of Tibet Autonomous Region from 1999–2004, based on Tibetan government sources.
Average annual share of Tibet AR’s production
Table 3 shows a clear trend toward increased harvest of yartsa gunbu. The increased number of collectors and discovery of “new” (i.e., previously unpicked) production areas would appear to drive the increased harvest. However, the spiraling value of the yartsa gunbu may be causing authorities to pay more attention to this product, in which case the growing production numbers may also reflect, in part, a reporting bias. There are also some year-to-year inconsistencies in production values. For instance, the data for 1999 did not include Shigatse and Lhoka prefectures, and adding a conservative estimate of this harvest would have raised Tibet’s production for that year to nearly 42,000 kg. On the other hand, given the well-established tradition of harvest in Chamdo and Nagchu prefectures, the year-to-year fluctuations recorded there likely reflect actual fluctuations in crop size.
The current and steadily increasing harvest pressure on yartsa gunbu is unprecedented. With increasing numbers of Tibetans searching for yartsa gunbu, and some local governments now facilitating searches in more remote places, the issue of sustainability looms large (see Bhattarai 1995; He and Sheng 1995; Schei et al. 2001; Zhang et al. 2001; Hywel-Jones 2003; Winkler 2005). Research on the consequences of intensive harvest of Cordyceps sinensis is noticeably lacking. Most statistics still report increased production, but this could be resulting from more people searching more areas. Interviewed collectors do not report reduced output, but complain about reduced harvesting rates per individual due to steadily-increasing competition. Similarly, dealers and brokers do not lament reduced output rates, but report increased competition as well.
Rapid Vulnerability Assessment (RVA) forCordyceps sinensis.
Factor (with abbreviated outline)
Remarks specific to Cordyceps sinensis
1. Life Form: Slow vs. fast growth and reproduction.
Quickly-reproducing fungi dependent on widespread host larvae.
2. Habitat Specificity: Narrow habitat requirements increase vulnerability.
Grass and shrub lands, the most extensive ecosystem of the Tibetan plateau; grazing does not appear to undermine growth, but overgrazing might.
3. Abundance and Distribution: Abundant, widely-distributed species are less vulnerable.
Widely distributed, but confined to High Asia.
4. Growth Rate: Slower-growing species will be more vulnerable to use.
Fungus is fast growing; larvae are relatively fast growing.
5. Response to Harvesting: The ability of a species to re-grow as a response to harvesting affects its vulnerability.
As long as sufficient spores are being dispersed and hosts are available, sustainability is presumably guaranteed; harvest before spore dispersal increases vulnerability and is common.
6. Parts Used: Part used significantly affects sustainability, e.g., use of leaves has less impact on a plant vs. use of the roots or whole plant.
Whole organism is removed; however, this is done close to the end of its completed lifecycle.
7. Pattern of Selection and Use: If a certain size, age, or quality of a species is used, the remaining population may ensure the survival of species.
All mushrooms seen are collected; however, their very small size and cryptic coloration ensure that not all specimens in an area are collected.
8. Demand: The level of demand (quantity and frequency) has a major impact on the species.
Very high demand; income derived is crucial for local population.
9. Seasonal Harvesting: Demand may be reduced if harvesting is restricted to certain seasons.
Fungus is only collected when fruiting and its host only after infection
10. Traditional Conservation Practices: When demand increases and commercial exploitation occurs, traditional practices often break down.
Has been collected for centuries, but rapidly advancing cash economy has substantially increased its economic importance; collecting taboos are disrespected in most places.
11. Commercialization: Once a product moves from subsistence use to commercialization, the chances of unsustainable use increases.
Well-established trade networks from most remote Tibetan grasslands to Chinese consumers in lowlands and abroad.
12. Substitutes: The availability of substitutes affects species’ vulnerability indirectly by reducing demand.
Artificial production of mycelium (spawn) supplies products to Western consumers. Semi-artificial production shows signs of success and might take off soon. However, Chinese consumers prefer the wild product.
With its extremely mountainous, vast, and sparsely-populated landscape, Tibet is experiencing great difficulties in making the transition from its traditional rural subsistence economy to a market-based economy as now envisioned by China. In the last decade, the sale of the tiny caterpillar fungus, Cordyceps sinensis, known as yartsa gunbu or chong cao, has become rural Tibetans’ means of entry into a steadily-expanding, cash-dependent lifestyle. It is difficult to overstate the contribution of yartsa gunbu to rural income in contemporary Tibet. Currently, an estimated 40% of rural Tibet’s total cash income, and in some regions as high as 80%, is derived from the sale of this one mushroom. This fungal commodification has enabled poor rural Tibetans to purchase vehicles and other goods and to pay school fees, hospital bills, and taxes.
As a result of this research, Luorong Zhandui of the Tibetology Research Center in Beijing submitted a policy advisory to the government of the Tibet AR (Luorong and Dawa 2005). This advisory formed the basis for the first region-wide regulations on collection and protection of yartsa gunbu, published in April 2006. In brief, the regulations include stipulations for surveying of the resource and development of a protection program, minimizing resource conflict, ensuring environmental protection and clean-up, and an initiative to standardize the licensing system. This was followed in December 2006 by a Tibet AR conference addressing these issues and providing a framework for implementation. It is too early to judge if these initiatives will bear fruit.
Scientific studies of sustainability are lacking. Regions that have been harvested for commercial export continually for hundreds of years, such as Litang in Sichuan province (Boesi 2003; Winkler 2003, 2005), are still producing prodigious quantities of yartsa gunbu, a testament to the resilience to human predation of this mushroom and its caterpillar host. However, the level and breadth of harvest now occurring are unprecedented, and research is needed to determine what basic management measures, if any, are required to ensure that yartsa gunbu remains plentiful for the generations to come.
China’s Beijing-based Tibet Research Institute sponsored the fieldwork in Tibet AR in 2005. This article integrates the findings of this cooperation. Special thanks to Luorong Zhandui, who took me to remote sites in Tibet AR. Without his support, I would not have been able to acquire much of the data. Jakob Winkler translated the yartsa gunbu text by Nyamnyi Dorje from Tibetan into English. In addition, I want to acknowledge all the other researchers who shared their knowledge and my Tibetan counterparts who supported me while tracking bu. Last, but not least, I am grateful to all the collectors and dealers who freely shared their knowledge and data.
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