The Lower Mekong region is one of the most natural-resource rich and bio-diverse areas in the world, and also one of those at highest risk.
The five countries are almost completely encompassed within the Indo-Burma hotspot, one of the world’s top ten critical areas for biodiversity. The 2,373,000 km2 area includes all of Vietnam, Cambodia and Laos and most of Myanmar and Thailand, as well as parts of Bangladesh, Malaysia and southern China. More than 360 new species were discovered in this region during 2012 and 2013 alone.1 Even so, with its fast pace of development and changing landscapes, it is ranked fifth in the world at threat from humans.2
At the heart of the Indo-Burma hotspot is the Lower Mekong Basin (LMB). The 4,350 km long Mekong river, which stretches from the Himalayas to the South China Sea, binds together the five Lower Mekong countries (Cambodia, Laos, Myanmar, Thailand and Vietnam), along with China’s Yunan Province, and provides critical ecosystem services, such as water and biodiversity, to support the region’s growing population and economies.
Apart from the LMB, the region includes a wide variety of other ecosystems, including mixed wet evergreen, dry evergreen, deciduous, and montane forests, as well lowland floodplain swamps, and seasonally inundated grasslands. Limestone karsts, with their own unique ecosystems, characterize the landscape in many areas—most famous among them is Vietnam’s Ha Long Bay. The region’s coastlines and marine areas are also rich in biodiversity (only Laos is landlocked).
Natural resources are central to age-old subsistence practices that have long provided forest, farming and fishing communities with their livelihoods. These ecosystems are equally important to support the region’s expanding economies. The complex hydrology of the Mekong, and its interface with watersheds and forests, provides the water, sedimentation, and organic matter to support almost 15 percent of the world’s paddy rice production in 2014.3 It also makes for the world’s largest freshwater fishery, producing 25% of the world’s freshwater catch.
The region’s forests produce timber and non-timber forest products—including resins, bamboo, and rattan—that are traded both locally and internationally. In the last 2-3 decades, the rush to modernize and industrialize has significantly altered landscapes. Although the region’s GDPs have increased substantively as a result, forests declined by 8 million hectares between 1990 and 20104 (and projected to fall by a further 0.9% of the 2010 total by 20205) and at least 310 species of fish are now listed as threatened in the five Lower Mekong countries.6
The development of hydropower, the anticipated expansion of mineral extraction, and the transition of agrarian systems to agro-industrial production are set to alter landscapes still further. The Lower Mekong region is considered be at high risk for climate change. By 2030 the Mekong basin’s mean temperature is likely to increase by 0.79°C, with greater increases for the colder catchments in the north.7
Source: IUCN. The IUCN Red List of Threatened Species. Version 2015-4. Created by ODI, August 2015. Licensed under CC BY-SA 4.0. View this data in the ODI DataHub.
ASEAN and the Greater Mekong Subregion countries have nonetheless prioritized environmental protection via programs such as the 2014 Preah Sihanouk Declaration on Building Coastal Resilience to Climate Change Impacts in Southeast Asia8, and the ASEAN Environmental Education Action Plans9.These and other agreements seek to recognize the potential economic growth in the region, while acknowledging the value of its biodiversity and natural resources.
Last updated 2 September 2015
- 1. World Wide Fund for Nature. 2014. Mysterious Mekong: New Species Discoveries 2012-2013. Bangkok: WWF. Accessed 13 July 2015. https://www.worldwildlife.org/publications/mysterious-mekong-new-species-discoveries-2012-2013.
- 2. Critical Ecosystem Partnership Fund. “Indo-Burma Hotspot.” Accessed 8 April 2015. http://www.cepf.net/resources/hotspots/Asia-Pacific/Pages/Indo-Burma.aspx.
- 3. Total 2014 paddy rice production of LMB countries: 104,641,000t; total global 2014 paddy rice production: 707,480,000 t. International Rice Research Institute. “World Rice Statistics.” Accessed 6 February 2015. http://ricestat.irri.org:8080/wrs.
- 4. Food and Agriculture Organization of the United Nations. 2011. Forests and Forestry in the Greater Mekong Subregion to 2020. Bangkok: FAO, 8. Accessed 21 January 2015. http://www.fao.org/docrep/014/i2093e/i2093e00.pdf.
- 5. Chen Erxue, Huang Kebiao, Li Zengyuan, Pang Yong and Qin Xianlin. 2011. “Forest aboveground biomass analysis using remote sensing in the Greater Mekong Subregion.” Resources Science 33(10): 1863-1869. Accessed 21 July 2015. http://22.214.171.124/zykx/EN/abstract/abstract1344.shtml.
- 6. International Union for the Conservation of Nature. “Red List, Table 5: Threatened Species in Each Country (Totals by Taxonomic Group).” Accessed 3 April 2015. http://cmsdocs.s3.amazonaws.com/summarystats/2014_3_Summary_Stats_Page_Documents/2014_3_RL_Stats_Table_5.pdf.
- 7. Lebel, L., C.T. Hoanh, C. Krittasudthacheewa and R. Daniel, eds. 2014. Climate Risks, Regional Integration and Sustainability in the Mekong Region. Kuala Lumpur: SIRD. Accessed 4 April 2015. http://www.sumernet.org/content/e-version-sumernet-book-now-available. View on Open Development Datahub
- 8. Third Annual Coastal Forum of the Building Coastal Resilience Project. 2014. “The Preah Sihanouk Declaration on Building Coastal Resilience to Climate Change Impacts in Southeast Asia.” http://cmsdata.iucn.org/downloads/3rd_coastal_forum__preah_sihanouk_declaration.pdf. Accessed 2 February 2015. View on Open Development Datahub
- 9. ASEAN. “Cooperation on Environment.” Accessed 1 April 2015. http://environment.asean.org/action-plans/.