AMBIO

, Volume 42, Issue 7, pp 864–876

The Flood Pulse as the Underlying Driver of Vegetation in the Largest Wetland and Fishery of the Mekong Basin

  • Mauricio E. Arias
  • Thomas A. Cochrane
  • David Norton
  • Timothy J. Killeen
  • Puthea Khon
Report

Abstract

The Tonle Sap is the largest wetland in Southeast Asia and one of the world’s most productive inland fisheries. The Mekong River inundates the Tonle Sap every year, shaping a mosaic of natural and agricultural habitats. Ongoing hydropower development, however, will dampen the flood pulse that maintains the Tonle Sap. This study established the current underlying relationship among hydrology, vegetation, and human use. We found that vegetation is strongly influenced by flood duration; however, this relationship was heavily distorted by fire, grazing, and rice cultivation. The expected flood pulse alteration will result in higher water levels during the dry season, permanently inundating existing forests. The reduction of the maximum flood extent will facilitate agricultural expansion into natural habitats. This study is the most comprehensive field survey of the Tonle Sap to date, and it provides fundamental knowledge needed to understand the underlying processes that maintain this important wetland.

Keywords

Cambodia Ecohydrology Wetlands Tropical floodplain vegetation 

Supplementary material

13280_2013_424_MOESM1_ESM.pdf (146 kb)
Fig. S1 (PDF 146 kb)
13280_2013_424_MOESM2_ESM.pdf (108 kb)
Table S2 (PDF 108 kb)
13280_2013_424_MOESM3_ESM.pdf (86 kb)
Table S3 (PDF 86 kb)
13280_2013_424_MOESM4_ESM.pdf (163 kb)
Table S4 (PDF 163 kb)
13280_2013_424_MOESM5_ESM.pdf (36 kb)
Table S5 (PDF 36 kb)
13280_2013_424_MOESM6_ESM.pdf (32 kb)
Table S6 (PDF 32 kb)

References

  1. Araki, Y., Y. Hirabuki, and D. Powkhy. 2007. Influence of large seasonal water level fluctuations and human impact on the vegetation of the Lake Tonle Sap, Cambodia. In Forest Environments in the Mekong River Basin, ed. H. Sawada, M. Araki, N.A. Chappell, J.V. LaFrankie, and A. Shimizu, 281–294. Dordrecht: Springer.Google Scholar
  2. Arias, M.E., T.A. Cochrane, M. Kummu, T.J. Killeen, T. Piman, and B.S. Caruso. 2012. Quantifying changes in flooding and habitats in the Tonle Sap Lake (Cambodia) caused by water infrastructure development and climate change in the Mekong Basin. Journal of Environmental Management 112: 53–66.CrossRefGoogle Scholar
  3. Bowman, D.M.J.S., and L. McDonough. 1991. Tree species distribution across a seasonally flooded elevation gradient in the Australian monsoon tropics. Journal of Biogeography 18: 203–212.CrossRefGoogle Scholar
  4. Campbell, I., C. Poole, W. Giesen, and J. Valbo-Jorgensen. 2006. Species diversity and ecology of Tonle Sap Great Lake, Cambodia. Aquatic Sciences—Research Across Boundaries 68: 355–373.CrossRefGoogle Scholar
  5. Chave, J., C. Andalo, S. Brown, M.A. Cairns, J.Q. Chambers, D. Eamus, H. Fölster, F. Fromard, N. Higuchi, T. Kira, J.-P. Lescure, B.W. Nelson, H. Ogawa, H. Puig, B. Riéra, and T. Yamakura. 2005. Tree allometry and improved estimation of carbon stocks and balance in tropical forests. Oecologia 145: 87–99.CrossRefGoogle Scholar
  6. Cochrane, T.T., and T.A. Cochrane. 2010. Amazon forest and Savanna lands: A guide to the climates, vegetation, landscapes and soils of central tropical South America. Scotts Valley, CA: CreateSpace.Google Scholar
  7. Costa-Cabral, M.C., J.E. Richey, G. Goteti, D.P. Lettenmaier, C. Feldkötter, and A. Snidvongs. 2007. Landscape structure and use, climate, and water movement in the Mekong River basin. Hydrological Processes 22: 1731–1746.CrossRefGoogle Scholar
  8. Davidson, P.J. 2006. The biodiversity of the Tonle Sap biosphere reserve: 2005 status review. Phnom Penh: Wildlife Conservation Society.Google Scholar
  9. Dy Phon, P. 2000. Dictionary of plants used in Cambodia, 1st ed. Phnom Penh: Imprimerie Olympic.Google Scholar
  10. FAO. 2006. Guidelines for soil description. Rome: FAO.Google Scholar
  11. Ferreira, L.V., and T.J. Stohlgren. 1999. Effects of river level fluctuation on plant species richness, diversity, and distribution in a floodplain forest in Central Amazonia. Oecologia 120: 582–587.CrossRefGoogle Scholar
  12. Finlayson, C.M. 2005. Plant ecology of Australia’s tropical floodplain wetlands: A review. Annals of Botany 96: 541–555.CrossRefGoogle Scholar
  13. Foti, R., M. del Jesus, A. Rinaldo, and I. Rodriguez-Iturbe. 2012. Hydroperiod regime controls the organization of plant species in wetlands. Proceedings of the National Academy of Sciences of the United States of America 109: 19596–19600.CrossRefGoogle Scholar
  14. Furch, K. 1997. Chemistry of Várzea and Igapó soils and nutrient inventory of their floodplain forest. In The central Amazon floodplain: Ecology of a pulsing system, ed. W.J. Junk, 47–67. Berlin: Springer.Google Scholar
  15. Grumbine, R.E., and J. Xu. 2011. Mekong hydropower development. Science 332: 178.CrossRefGoogle Scholar
  16. Hellsten, S., E. Jarvenpaa, and T. Dubrorin. 2003. Preliminary observations of floodplain habitats and their relations to hydrology and human impact, modelling of the flow regime and water quality of the Tonle Sap. MRCS/WUP-FIN.Google Scholar
  17. Hortle, K.G. 2007. Consumption and the yield of fish and other aquatic animals from the Lower Mekong Basin (No. MRC Technical Paper No. 16). Vientiane, Lao PDR: Mekong River Commission.Google Scholar
  18. Inomata, H., and K. Fukami. 2008. Restoration of historical hydrological data of Tonle Sap Lake and its surrounding areas. Hydrological Processes 22: 1337–1350.CrossRefGoogle Scholar
  19. JICA. 1999. Cambodia reconnaissance survey digital data. Phnom Penh: Japan International Cooperation Agency.Google Scholar
  20. Junk, W.J., and M.T.F. Piedade. 1997. Plant life in the floodplain with special reference to herbaceous plants. In The central Amazon floodplain: Ecology of a pulsing system, ed. W.J. Junk, 147–186. Berlin: Springer.Google Scholar
  21. Junk, W.J., P.B. Bayley, and R.E. Sparks. 1989. The flood pulse concept in river-floodplain systems. In International large river symposium, 110–127. Ottawa: Canadian Special Publication of Fisheries and Aquatic Sciences.Google Scholar
  22. Junk, W.J., M.T. Brown, I.C. Campbell, C.M. Finlayson, B. Gopal, L. Ramberg, and B.G. Warner. 2006. The comparative biodiversity of seven globally important wetlands: A synthesis. Aquatic Sciences—Research Across Boundaries 68: 400–414.CrossRefGoogle Scholar
  23. Junk, W.J., S. An, C.M. Finlayson, B. Gopal, J. Květ, S.A. Mitchell, W.J. Mitsch, and R.D. Robarts. 2013. Current state of knowledge regarding the world’s wetlands and their future under global climate change: A synthesis. Aquatic Sciences 75: 151–167.CrossRefGoogle Scholar
  24. Keskinen, M. 2006. The Lake with floating villages: Socio-economic analysis of the Tonle Sap Lake. International Journal of Water Resources Development 22: 463–480.CrossRefGoogle Scholar
  25. Keskinen, M., and O. Varis. 2012. Institutional cooperation at a basin level: For what, by whom? Lessons learned from Cambodia’s Tonle Sap Lake. Natural Resources Forum 36: 50–60.CrossRefGoogle Scholar
  26. Kummu, M., and J. Sarkkula. 2008. Impact of the Mekong River flow alteration on the Tonle Sap flood pulse. AMBIO 37: 185–192.CrossRefGoogle Scholar
  27. Kummu, M., J. Sarkkula, J. Koponen, and J. Nikula. 2006. Ecosystem Management of the Tonle Sap Lake: An integrated modelling approach. International Journal of Water Resources Development 22: 497–519.CrossRefGoogle Scholar
  28. Kummu, M., X.X. Lu, J.J. Wang, and O. Varis. 2010. Basin-wide sediment trapping efficiency of emerging reservoirs along the Mekong. Geomorphology 119: 181–197.CrossRefGoogle Scholar
  29. Lamberts, D. 2006. The Tonle Sap Lake as a productive ecosystem. International Journal of Water Resources Development 22: 481–495.CrossRefGoogle Scholar
  30. Lauri, H., H. de Moel, P.J. Ward, T.A. Räsänen, M. Keskinen, and M. Kummu. 2012. Future changes in Mekong River hydrology: Impact of climate change and reservoir operation on discharge. Hydrology and Earth System Sciences 16: 4603–4619.CrossRefGoogle Scholar
  31. Lepš, J., and P. Šmilauer. 2003. Multivariate analysis of ecological data using CANOCO. Cambridge: Cambridge University Press.Google Scholar
  32. McDonald, J.A., P. Bunnat, P. Virak, and L. Bunton. 1997. Plant communities of the Tonle Sap floodplain. UNESCO/IUCN/WI.Google Scholar
  33. Milzow, C., V. Burg, and W. Kinzelbach. 2010. Estimating future ecoregion distributions within the Okavango Delta Wetlands based on hydrological simulations and future climate and development scenarios. Journal of Hydrology 381: 89–100.CrossRefGoogle Scholar
  34. MRC. 2005. Overview of the hydrology of the Mekong Basin. Vientiane: MRC.Google Scholar
  35. MRC. 2010. Impacts on the Tonle Sap Ecosystem (No. Technical Note 10), assessment of basin-wide development scenarios. Basin Development Plan Programme, Phase 2. Vientiane, Lao PDR: Mekong River Commission.Google Scholar
  36. Mubyana, T., M. Krah, O. Totolo, and M. Bonyongo. 2003. Influence of seasonal flooding on soil total nitrogen, organic phosphorus and microbial populations in the Okavango Delta, Botswana. Journal of Arid Environments 54: 359–369.CrossRefGoogle Scholar
  37. Murray-Hudson, M. 2009. Floodplain vegetation responses to flood regime in the seasonal Okavango Delta, Botswana. PhD thesis. University of Florida, Environmental Engineering Sciences, Gainesville, FL, USA.Google Scholar
  38. Murray-Hudson, M., F. Combs, P. Wolski, and M.T. Brown. 2011. A vegetation-based hierarchical classification for seasonally pulsed floodplains in the Okavango Delta, Botswana. African Journal of Aquatic Science 36: 223–234.CrossRefGoogle Scholar
  39. Parolin, P., and F. Wittmann. 2010. Struggle in the flood: Tree responses to flooding stress in four tropical floodplain systems. AoB Plants 2010. doi:10.1093/aobpla/plq003.
  40. Parolin, P., L.V. Ferreira, A.L.K.M. Albernaz, and S.S. Almeida. 2004. Tree species distribution in Várzea forests of Brazilian Amazonia. Folia Geobotanica 39: 371–383.CrossRefGoogle Scholar
  41. Ter Braak, C.J.F. 1986. Canonical correspondence analysis: A new eigenvector technique for multivariate direct gradient analysis. Ecology 67: 1167–1179.CrossRefGoogle Scholar
  42. Todd, M.J., R. Muneepeerakul, D. Pumo, S. Azaele, F. Miralles-Wilhelm, A. Rinaldo, and I. Rodriguez-Iturbe. 2010. Hydrological drivers of wetland vegetation community distribution within Everglades National Park, Florida. Advances in Water Resources 33: 1279–1289.CrossRefGoogle Scholar
  43. Warfe, D.M., N.E. Pettit, P.M. Davies, B.J. Pusey, S.K. Hamilton, M.J. Kennard, S.A. Townsend, P. Bayliss, D.P. Ward, M.M. Douglas, M.A. Burford, M. Finn, S.E. Bunn, and I.A. Halliday. 2011. The “wet–dry” in the wet–dry tropics drives river ecosystem structure and processes in northern Australia. Freshwater Biology 56: 2169–2195.CrossRefGoogle Scholar
  44. Worbes, M. 1997. The forest ecosystem of the floodplains. In The central Amazon floodplain: Ecology of a pulsing system, ed. W.J. Junk, 223–266. Berlin: Springer.CrossRefGoogle Scholar
  45. Xu, J., R.E. Grumbine, A. Shrestha, M. Eriksson, X. Yang, Y. Wang, and A. Wilkes. 2009. The Melting Himalayas: Cascading effects of climate change on water, biodiversity, and livelihoods. Conservation Biology 23: 520–530.CrossRefGoogle Scholar
  46. Ziv, G., E. Baran, S. Nam, I. Rodriguez-Iturbe, and S.A. Levin. 2012. Trading-off fish biodiversity, food security, and hydropower in the Mekong River Basin. Proceedings of the National Academy of Sciences of the United States of America 109: 5609–5614.CrossRefGoogle Scholar

Copyright information

© Royal Swedish Academy of Sciences 2013

Authors and Affiliations

  • Mauricio E. Arias
    • 1
  • Thomas A. Cochrane
    • 1
  • David Norton
    • 2
  • Timothy J. Killeen
    • 3
  • Puthea Khon
    • 4
  1. 1.Department of Civil and Natural Resources EngineeringUniversity of CanterburyChristchurchNew Zealand
  2. 2.New Zealand School of ForestryUniversity of CanterburyChristchurchNew Zealand
  3. 3.Carbon and Commodities ProgramWorld Wildlife FundWashingtonUSA
  4. 4.Faculty of Mathematics, Sciences and EngineeringPannasastra University of CambodiaPhnom PenhCambodia

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