Artificial deepening of seasonal waterholes in eastern Cambodia: impact on water retention and use by large ungulates and waterbirds

Main Article Content

Thomas N.E. Gray
William J. McShea
Arnulf Koehncke
Prum Sovanna
Mark Wright

Abstract

Natural seasonal waterholes (trapeang in Khmer) are an important feature of the deciduous dipterocarp forests of eastern Cambodia and are utilised by a number of globally threatened species of large ungulates and waterbirds. However at the end of the dry-season (April) only a small proportion of waterholes retain water. In 2011, we artificially deepened six waterholes in the core area of Mondulkiri Protected Forest, eastern Cambodia, removing 3m3 to 24m3 of earth (mean 16.5m3) from each.  Surveys prior to deepening demonstrated that only one of these waterholes, and 10% of all waterholes surveyed in the study area (n=50), held water at the end of the dry-season.  Following modification five of the six deepened waterholes (83%) held water at the end of the subsequent dry-season. From four camera traps over 448 trap-nights, 23 species including two globally threatened large ungulates, Banteng Bos javanicus and Eld’s Deer Rucervus eldii, and two Critically Endangered Ibises (Giant Thaumatibis gigantea and White-shouldered Ibis Pseudibis davisoni), were photographed foraging and drinking at the deepened waterholes between March and June 2012.  Our results suggest that artificial deepening of natural waterholes does not cause damage, and makes these waterholes suitable for use throughout the dry-season.  In the face of changing climate it is suggested that management plans should have a programme for the survey and determination of the status of waterholes every year and improve the use of water resources by artificial deepening.

 

Article Details

How to Cite
[1]
Gray, T.N., McShea, W.J., Koehncke, A., Sovanna, P. and Wright, M. 2015. Artificial deepening of seasonal waterholes in eastern Cambodia: impact on water retention and use by large ungulates and waterbirds. Journal of Threatened Taxa. 7, 6 (May 2015), 7189–7195. DOI:https://doi.org/10.11609/JoTT.o3935.7189-95.
Section
Communications
Author Biographies

Thomas N.E. Gray, WWF Greater Mekong, Conservation Strategy 3, House No. 39, Unit 05, Ban Saylom, Vientiane, Lao PDR

Thomas Gray is regional species manager for WWF Greater Mekong and has been conducting conservation research in Cambodia since 2005.

 

William J. McShea, Conservation Ecology Center, Smithsonian Conservation Biology Institute, National Zoological Park, 1500 Remount Rd., Front Royal, VA 22630 USA

William ‘Bill’ McShea is an ecologist who has worked at the National Zoo’s facility in Front Royal, Virginia, since 1986.  His research focuses on wildlife management and conservation of mammals and forests. 

 

Arnulf Koehncke, WWF Cambodia, #21, Street 322, Sangkat Beoung Keng Kang 1, Phnom Penh, Cambodia; WWF Germany, Reinhardtstr. 14, 10117 Berlin; Institute for Theoretical Biology, Humboldt-Universität zu Berlin, Invalidenstr. 43, 10115 Berlin, Germany

Arnulf Koehncke was an intern supporting WWF Cambodia and currently works for WWF Germany

 

Prum Sovanna, Department of Wildlife and Biodiversity, Forestry Administration, Ministry of Agriculture Forestry and Fisheries, 40 Norodom Blvd, Phnom Penh, Cambodia

Prum Sovanna has worked in conservation for the government of Cambodia, and partner NGOs, since the mid 1990s and has led large mammal surveys across the country

 

Mark Wright, WWF Cambodia, #21, Street 322, Sangkat Beoung Keng Kang 1, Phnom Penh, Cambodia

Mark Wright was the landscape manager for WWF Cambodia’s Eastern Plains Landscape project.

References

Beaumont, L.J., A. Pitman, S. Perkins, N.E. Zimmermann, N.G. Yoccoz & W. Thuiller (2011). Impacts of climate change on the world’s most exceptional ecoregions. Proceedings of the National Academy of Sciences 108: 2306–2311.

Bruce, C. (2013). Creating options for long-term resource use and conservation in the eastern plains dry forest landscape of Cambodia, pp. 145–156. In: Sunderland, T.C.H., J. Sayer & M.H. Hoang (eds.). Evidence-based Conservation: Lessons from the Lower Mekong. Earthscan from Routledge.

Duncan, C., A.L.M. Chauvenet, L.M. McRae & N. Pettorelli (2012). Predicting the future impact of droughts on ungulate populations in arid and semi-arid environments. PLOS ONE 7(12): e51490; http://dx.doi.org/10.1371/journal.pone.0051490

Gray, T.N.E., R. Ou, K. Huy, C. Pin & A.L. Maxwell (2012a). The status of large mammals in eastern Cambodia: a review of camera-trapping data 1999–2007. Cambodian Journal of Natural History 2012: 42–55.

Gray, T.N.E., S. Prum, C. Pin & C. Phan (2012b). Distance sampling reveals Cambodia’s Eastern Plains Landscape supports largest global population of the endangered Banteng Bos javanicus. Oryx 46: 563–566.

Gray, T.N.E., C. Phan, C. Pin & S. Prum (2013). Establishing a monitoring baseline for threatened large ungulates in eastern Cambodia. Wildlife Biology 18: 406–413.

Koehncke, A. (2010). Report on Monitoring Waterhole-Dynamics in Mondulkiri Protected Forest. WWF-Cambodia, Phnom Penh, Cambodia, 32pp.

Lacasa, V.R.G., C.S. Garcia-Abad, R.P. Martin, D.J. Bartolome Rodriguez, J.A.P. Garrido & M.E.A. de La Varga (2010). Small game water troughs in a Spanish agrarian pseudo steppe: visits and water site choice by wild fauna. European Journal of Wildlife Research 56: 591–599.

Mint, A., W.J. McShea, S. Htung, A. Than, T.M. Soe, S. Monfort & C. Wemmer (2001). Ecology and social organization of a tropical deer. Journal of Mammalogy 82: 836–847.

Owen-Smith, N. (1996). Ecological guidelines for waterpoints in extensive protected areas. South African Journal of Wildlife Research 26: 107–112

Phan, C., S. Prum & T.N.E. Gray (2010). Recent camera-trap records of globally threatened species from the Eastern Plains Landscape, Cambodia. Cambodian Journal of Natural History 2010: 89–93.

Pin, C., C. Phan, S. Prum & T.N.E. Gray (2013). Structure and composition of deciduous dipterocarp forest in the Eastern Plains Landscape, Cambodia. Cambodian Journal of Natural History 2013: 27–34.

Shrader, A.M., S.L. Pimm & R.J. van Aarde (2010). Elephant survival, rainfall and the confounding effects of water provision and fences. Biodiversity & Conservation 19: 2235–2245.

Smit, I.P.J., C.C. Grant & B.J. Devereux (2007). Do artificial waterholes influence the way herbivores use the landscape? Herbivore distribution patterns around rivers and artificial surface water sources in a large African Savanna Park. Biological Conservation 136: 85–99.

Timmins, R.J. (2011). An assessment of the ‘vulnerability’ of the proposed Western Siem Pang Protected Forest to climate change, with recommendations for adaptation and monitoring. BirdLife International, Phnom Penh, Cambodia, 132pp.

Timmins, R.J., J.W. Duckworth, S. Hedges, R. Steinmetz & A. Pattanavibool (2008). Bos javanicus. The IUCN Red List of Threatened Species. Version 2014.3. www.iucnredlist.org, Downloaded on 28 March 2015.

Tordoff, A.W., R.J. Timmins, A. Maxwell, K. Huy, V. Lic & E.H. Khou (2005). Biological Assessment of the Lower Mekong Dry Forests Ecoregion. WWF Greater Mekong. Phnom Penh, Cambodia, 304pp.

Wright, H.L., N.J. Collar, I.R. Lake, N. Net, V. Rours, K. Sok, P. Sun & P.M. Dolman (2012a). First census of the White-shouldered Ibis Pseudibis davisoni reveals roost-site mismatch with Cambodia’s protected areas. Oryx 46: 236–239.

Wright, H.L., N.J. Collar, I.R. Lake, V. Bou & P.M. Dolman (2012b). Foraging ecology of sympatric White-shouldered Ibis Pseudibis davisoni and Giant Ibis Thaumatibis gigantea in northern Cambodia. Forktail 28: 93–100.

Wright, H.L., N.J. Collar, I.R. Lake & P.M. Dolman (2013). Amphibian concentrations in dessicating mud may determine the breeding season of the White-shouldered Ibis Pseudibis davisoni. Auk 130: 774–783.