TAN Tiang Wah, Hugh  陈长华 (陳長華)

Associate Professor

Contact Information:

Department of Biological Sciences
National University of Singapore
14 Science Drive 4
Singapore 117543

6516 2717
6779 2486

Academics Qualifications

PhD NUS, BSc Hons Sing. BSc Sing.

Research Areas

Conservation Biology, Plant Systematics and Ecology, Urban Greenery and Ecology, Restoration Ecology, Tropical Horticulture, Urban Agriculture

Current Projects

  • Cultivation of vegetables using the digestate from the anaerobic digestion of food waste
  • Cultivation of vegetables using the waste produced by black soldier fly processing of food waste
  • Vertical farming of vegetables
  • Feasibility of organic farming in Housing & Development Board residential apartment blocks
  • Feasibility of sea farming in Singapore
  • Feasibility of self-sufficiency in food production in Singapore
  • Restoration of Pandan Reservoir using macrophytes: a mesocosm study
  • Development of a Biodiversity Index for residential towns in Singapore
  • Functional diversity of secondary forests in human-modified landscapes
  • Nepenthes: a model system for the study of resource-mediated interspecific interactions
  • Centers of plant generic endemism in Borneo and their significance for biogeography and conservation
  • Orthoptera as drivers of ecosystem processes in tropical forests

Undergrad Student Research Projects Currently Available

Please go HERE to download the list of currently available research projects that are suitable for the research modules: UROPS (LSM2288, LSM2289, LSM3288, LSM3289) or final-year project (LSM4199).


Selected Publications

  1. Lam, W. N., R. J. Y. Lim, S. H. Wong & H. T. W. Tan, 2018. Predatory dipteran larva contributes to nutrient sequestration in a carnivorous pitcher plant. Biology Letters, 14: 20170716.

  2. Lam, W. N., W. Y. Wang, L. F. Cheong, J. K. H. Koh, M. Foo, K. Y. Chong & H. T. W. Tan, 2018. Pitcher plant facilitates prey capture in a sympatric congener. Plant Ecology, 219: 299-311.

  3. Tan, M. K., C.-c. Chang & H. T. W. Tan, 2018. Shy herbivores forage more efficiently than bold ones regardless of information-processing overload. Behavioural Processes, 149: 52-58.

  4. Chong, K. Y., M. B. Raphael, L. R. Carrasco, A. T. K. Yee, X. Giam, V. B. Yap & H. T. W. Tan, 2017. Reconstructing the invasion history of a spreading, non-native, tropical tree through a snapshot of current distribution, sizes, and growth rates. Plant Ecology, 218: 673-685.

  5. Choo, Y. R., A. T. Yan, R. H. J. Loh, Z. Y. Chin, C. S. Jo, K. E. M. Lee, M. K. Tan & H. T. W. Tan, 2017. Can waste vegetables and weeds be used to farm crickets and grasshoppers in Singapore? UTAR Agriculture Science, 3: 18-22.

  6. Harrison, R. D., K. Y. Chong, N. M. Pham, A. T. K. Yee, C. K. Yeo, H. T. W. Tan & J.-Y. Rasplus, 2017. Pollination of Ficus elastica: India rubber re-establishes sexual reproduction in Singapore. Scientific Reports, 7: 11616.

  7. Lam, W. N., K. Y. Chong, G. S. Anand & H. T. W. Tan, 2017. Dipteran larvae and microbes facilitate nutrient sequestration in the Nepenthes gracilis pitcher plant host. Biology Letters, 13(3): 20160928.

  8. Song, X. P., H. T. W. Tan & P. Y. Tan, 2017. Assessment of light adequacy for vertical farming in a tropical city. Urban Forestry & Urban Greening, 29: 49-57.

  9. Soliman, T., A. MacLeod, J. D. Mumford, T. P. L. Nghiem, H. T. W. Tan, S. K. Papworth, R. T. Corlett & L. R. Carrasco, 2016. A regional decision support scheme for pest risk analysis in Southeast Asia. Risk Analysis, 36(5): 904-913.

  10. Yang, Z., S. K. Koh, W. C. Ng, R. C. J. Lim, H. T. W. Tan, Y. W. Tong, Y. Dai, C. Chong & C.-H. Wang, 2016. Potential application of gasification to recycle food waste and rehabilitate acidic soil from secondary forests on degraded land in Southeast Asia. Journal of Environmental Management, 172: 40-48.

  11. Yee, A. T. K., K. Y. Chong, L. Neo & H. T. W. Tan, 2016. Updating the classification system for the secondary forests of Singapore. Raffles Bulletin of Zoology, Supplement No. 32: 11-21.

  12. Giam, X., L. Mani, L. P. Koh & H. T. W. Tan, 2015. Saving tropical forests by knowing what we consume. Conservation Letters, 9(4): 267-274.

  13. Nghiem, L. T. P., H. T. W. Tan & R. T. Corlett, 2015. Invasive trees in Singapore: are they a threat to native forests? Tropical Conservation Science, 18: 201-214.

  14. Chong, K. Y., S. Teo, B. Kurukulasuriya, Y. F. Chung, S. Rajathurai & H. T. W. Tan, 2014. Not all green is as good: Different effects of the natural and cultivated components of urban vegetation on bird and butterfly diversity. Biological Conservation, 171: 299-309.

  15. Yeo, H. H. T., K. Y. Chong, A. T. K. Yee, X. Giam, R. T. Corlett & H. T. W. Tan, 2014. Leaf litter depth as an important factor inhibiting seedling establishment of an exotic palm in tropical secondary forest patches. Biological Invasions, 16: 381-392.

  16. Wee, A. K. S., K. Takayama, T. Asakawa, B. Thompson, Onrizal, S. Sungkaew, X. T. Nguyen, M. Nazre, K. K. Soe, H. T. W. Tan, Y. Watano, S. Baba, T. Kajita & E. L. Webb, 2014. Oceanic currents, not land masses, maintain the genetic structure of the mangrove Rhizophora mucronata Lam. (Rhizophoraceae) in Southeast Asia. Journal of Biogeography, 41: 954-964.

  17. Nghiem, L. T. P., T. Soliman, D. C. J. Yeo, H. T. W. Tan, T. A. Evans, J. D. Mumford, R. P. Keller, R. H. A. Baker, R. T. Corlett & L. R. Carrasco, 2013. Economic and environmental impacts of harmful non-indigenous species in Southeast Asia. PLoS ONE, 8, article number e71255.

  18. Chong, K. Y., S. Teo, B. Kurukulasuriya, Y. F. Chung, S. Rajathurai, H. C. Lim & H. T. W. Tan, 2012. Decadal changes in urban bird abundance in Singapore. The Raffles Bulletin of Zoology, Supplement 25: 189-196.

  19. Giam, X., L. P. Koh, H. H. Tan, J. Miettinen, H. T. W. Tan & P. K. L. Ng, 2012. Global extinctions of freshwater fishes follow peatland conversion in Sundaland. Frontiers in Ecology and the Environment, 10: 465-470.

  20. Chong, K. Y., S. M. L. Lee, A. T. Gwee, P. K. F. Leong, S. Ahmad, W. F. Ang, A. F. S. L. Lok, C. K. Yeo, R. T. Corlett & H. T. W. Tan, 2012. Herbarium records do not predict rediscovery of presumed nationally extinct species. Biodiversity and Conservation, 21: 2589-2599.

  21. Giam, X., N. S. Sodhi, B. W. Brook, H. T. W. Tan & C. J. A. Bradshaw, 2011. Relative need for conservation assessments of vascular plant species among ecoregions. Journal of Biogeography, 38: 55-68.

  22. Ng, P.K.L., R.T. Corlett and H.T.W. Tan (eds.), 2011. Singapore Biodiversity: An Encyclopaedia of the Natural Environment and Sustainable Development. Editions Didier Millet in association with the Raffles Museum of Biodiversity Research, National University of Singapore, Singapore. 552 pp.


  23. Chong, K. Y., R. T. Corlett, D. C. J. Yeo & H. T. W. Tan, 2010. Towards a global database of weed risk assessments: A test of transferability for the tropics. Biological Invasions, 13: 1571-1577.

  24. Giam, X., C. J. A. Bradshaw, H. T. W. Tan & N. S. Sodhi, 2010. Future habitat loss and the conservation of plant biodiversity. Biological Conservation, 143: 1594-1602.

  25. Giam, X., T. H. Ng, V. B. Yap & H. T. W. Tan, 2010. The extent of undiscovered species in Southeast Asia. Biodiversity and Conservation, 19: 943-954.

  26. Tan, H.T.W., L.M. Chou, D.C.J. Yeo and P.K.L. Ng. 2010. The Natural Heritage of Singapore. 3rd Edition. Prentice Hall/Pearson South Asia Pte Ltd, Singapore. 323 pp.


  27. Chong, K. Y., H. T. W. Tan & R. T. Corlett, 2009. A Checklist of the Total Vascular Plant Flora of Singapore: Native, Naturalised and Cultivated Species. Raffles Museum of Biodiversity Research, National University of Singapore, Singapore. 273 pp. Uploaded 12 Nov.2009. [PDF, 1.03 MB]

  28. Shi, A. Z., L. P. Koh & H. T. W. Tan. 2009. The biofuel potential of municipal solid waste. GCB Bioenergy, 1: 317-320.

  29. Bradshaw, C. J. A., X. Giam, H. T. W. Tan, B. W. Brook & N. S. Sodhi. 2008. Threat or invasive status in legumes is related to opposite extremes of the same ecological and life-history attributes. Journal of Ecology, 96: 869-883.

  30. Sodhi, N. S., L. P. Koh, S.-H. Peh, H. T. W. Tan, R. L. Chazdon, R. T. Corlett, T. M. Lee, R. K. Colwell, B. W. Brook, C. H. Sekercioglu & C. J. A. Bradshaw. 2008. Correlates of extinction proneness in tropical angiosperms. Diversity and Distributions, 14: 1-10.

  31. Koh, L.P., H.T.W. Tan and N.S. Sodhi. 2008. Biofuels: Waste not, want not. Science, 320: 1419.

  32. Tan, H. T. W., B. C. Tan, K.-x., Tan, Ali bin Ibrahim, P. T. Chew, K. S. Chua, H. Duistermaat, S. K. Ganesan, M. W. K. Goh, A. T. Gwee, R. Kiew, S. M. L. Lee, P. Leong, J. Lim, A. F. S. L. Lok, A. H. B. Loo, S. K. Y. Lum, T. Morgany, Saifuddin bin Suran, S. Sim, Haji Samsuri bin Haji Ahmad, Y. C. Wee, K. F. Yap, C. K. Yeo & J. W. H. Yong. 2008. Checklists of threatened species: Seed plants. In: Davison, G. W. H., P. K. L. Ng & H. C. Ho (eds.), The Singapore Red Data Book: Threatened Plants and Animals of Singapore. 2nd Edition. Nature Society (Singapore), Singapore. Pp. 213-244.

    red data book cover-w250

  33. Pandit, M. K., H. T. W. Tan & M. S. Bishi. 2006. Polyploidy in invasive plant species of Singapore. Botanical Journal of the Linnean Society, 151: 395-403.

  34. Tan, H.T.W. 2006. Nature Reserve Parks, Gardens and Streetscapes: Today Singapore, Tomorrow the World. 10 pp.

  35. Teo, D. H. L., H. T. W. Tan, R. T. Corlett, C. M. Wong & S. K. Y. Lum, 2003. Continental rain forest fragments in Singapore resist invasion by exotic plants. Journal of Biogeography, 30: 305-310.

  36. Koh, L. P., N. S. Sodhi, H. T. W. Tan & K. S.-H. Peh, 2002. Factors affecting the distribution of vascular plants, springtails, butterflies and birds on small tropical islands. Journal of Biogeography, 29: 93-108.

  37. Keng, H., S. C. Chin & H. T. W. Tan, 1998. A Concise Flora of Singapore. Volume II: Monocotyledons. Singapore University Press, Singapore. 215 pp. Available at NUS Publishing.


  38. Turner, I.M., K.S. Chua, J.S.Y. Ong, B.C. Soong and H.T.W. Tan., 1996. A century of plant species loss from an isolated fragment of lowland tropical rain forest. Conservation Biology, 10: 1229-1244.

  39. Tan, H. T. W. (ed.), 1995. A Guide to the Threatened Plants of Singapore. Singapore Science Centre, Singapore. 158 pp.
    Turner, I. M., H. T. W. Tan, Y. C. Wee, Ali Ibrahim, P. T. Chew & R. T. Corlett, 1994. A study of plant species extinction in Singapore: lessons for the conservation of tropical biodiversity. Conservation Biology, 8: 705-712.

Hugh Tan’s 168 Selected Publications on Singapore Biodiversity