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Catastrophic ongoing decline in Cambodia’s Bengal Florican Houbaropsis bengalensis population



In 2013 a prediction was made that the South-East Asian subspecies of Bengal Florican Houbaropsis bengalensis blandini would be extinct within 10 years. In 2018 we conducted a survey in the Tonle Sap floodplain, Cambodia, of the last population of Bengal Florican in South-East Asia. We found that the rate of decline in displaying males was 55% over five years, a decline comparable to that recorded between 2005–2007 and 2012. The estimated number of displaying males in 2018 was 104 (95% CI: 89–117), down from 216 (156–275) in 2012. We also conducted surveys by flushing birds in the non-breeding season, which indicated that the sex ratio of males to females is 3:1. We therefore estimate that the total population of adult Bengal Floricans in Cambodia in 2018 was 138 (119–156), making H. b. blandini the most threatened bustard taxon. The number of sites that support displaying male Bengal Floricans was reduced from 10 to four between 2012 and 2018. Between 2012 and 2018 we monitored numbers of displaying males in most years at the sites that support 80% of the total population. The only site where numbers of birds are stable is Stoung-Chikraeng Bengal Florican Conservation Area, where there were 44 (25–63) displaying males in 2018. This is the only site that has an ongoing NGO-government conservation programme. Our data indicate that Bengal Floricans are lost from sites when the area of grassland falls below 25 km2. We found evidence that displaying male Bengal Floricans abandon display territories when grassland is lost, this also creates hope that they may disperse and could colonise newly created habitat. All remaining sites that support Bengal Floricans in Cambodia are imperilled and we outline what must be done to reduce the possibility that H. b. blandini will be extinct by 2023.


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Arias, M. E., Cochrane, T. A., Piman, T., Kummu, M., Caruso, B. S. and Killeen, T. J. (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. J. Environ. Manage. 112: 5366.
Arias, M. E., Piman, T., Lauri, H., Cochrane, T. A. and Kummu, M. (2014) Dams on Mekong tributaries as significant contributors of hydrological alterations to the Tonle Sap Floodplain in Cambodia. Hydrol. Earth Syst. Sci. 18: 53035315.
BirdLife International (2018) Species factsheet: Houbaropsis bengalensis.
Bretagnolle, V., Villers, A., Denonfoux, L., Cornulier, T., Inchausti, P. and Badenhausser, I. (2011) Rapid recovery of a depleted population of Little Bustards Tetrax tetrax following provision of alfalfa through an agri-environment scheme. Ibis 153: 413.
Campbell, I. C., Poole, C., Giesen, W. and Valbo-Jorgensen, J. (2006) Species diversity and ecology of Tonle Sap Great Lake, Cambodia. Aquat. Sci. 68: 355373.
Collar, N., Garcia, E. F. J. and Sharpe, C. J. (2018) Bengal Florican (Houbaropsis bengalensis), in Handbook to the Birds of the World Alive. Barcelona: Lynx Edicions.
Collar, N., Patil, P. and Bhardwaj, G. (2015) What can save the Great Indian Bustard Ardeotis nigriceps. Birding ASIA 23: 1524.
Collar, N. J., Baral, H. S., Batbayer, N., Bhardwaj, G. S., Brahma, N., Burnside, R. J., Choudhury, A. U., Combreau, O., Dolman, P. M., Donald, P. F., Dutta, S., Gadhavi, D., Gore, K., Goroshko, O. A., Hong, C., Jather, G. A., Jha, R. R. S., Jhala, Y. V., Koshkin, M. A., Lahkar, B. P., Liu, G., Mahood, S. P., Morales, M. B., Narwade, S. S., Natsagdorj, T., Nefedov, A. A., Silva, J. P., Thakuri, J. J., Wang, M., Zhang, Y. and Kessler, A. E. (2017) Averting the extinction of bustards in Asia. Forktail 33: 126.
Davidson, P. (2004) The distribution, ecology and conservation status of the Bengal Florican Houbaropsis bengalensis in Cambodia. School of Environmental Sciences, University of East Anglia, Norwich, UK.
Doherty, T. S., Dickman, C. R., Glen, A. S., Newsome, T. M., Nimmo, D. G., Ritchie, E. G., Vanak, A. T. and Wirsing, A. J. (2017) The global impacts of domestic dogs on threatened vertebrates. Biol. Conserv. 210: 5659.
Dolman, P. M., Collar, N. J., Scotland, K. M. and Burnside, R. J. (2015) Ark or park: the need to predict relative effectiveness of ex situ and in situ conservation before attempting captive breeding. J. Appl. Ecol. 52: 841850.
Donald, P., Collar, N., Marsden, S. and Pain, D. (2013) Facing extinction: the world’s rarest birds and the race to save them . 2nd edition. London: T & A. D. Poyser.
Donald, P. F. (2007) Adult sex ratios in wild bird populations. Ibis 149: 671692.
Dutta, S., Narwade, S. S., Bipin, C. M., Gadhavi, D., Uddin, M., Mhasker, M., Pandey, D., Mohan, A., Sharma, H., Iyer, S., Tripathi, R., Verma, V., Varma, V., Chakdar, B., Karulkar, A., , B., L., Khongsai, N., Kumar, S., Gore, K., Jhala, D., Vaidya, N., Horne, B., Chittora, A., Annigeri, B. S., Trivedi, M. and Jhala, Y. V. (2018) Status of the Lesser Florican Sypheotides indicus and implications for its conservation. Dehradun: Wildlife Insitute of India.
Dutta, S., Rahmani, A. R. and Jhala, Y. V. (2010) Running out of time? The Great Indian bustard Ardeotis nigriceps—status, viability, and conservation strategies. Eur. J. Wildl. Res. 57: 615625.
Eaton, J. A., Mahood, S. P. and Eames, J. C. (2014) Chinese Grassbird Graminicola striatus in South-East Asia: lost, forgotten and re-found. Birding ASIA 22: 1921.
Goes, F. (2013) The birds of Cambodia: An annotated checklist. Pnomh Penh, Cambodia: Centre for Biodiversity Conservation, Fauna & Flora International Cambodia Programme and Royal University of Phnom Penh.
Gray, T. N. E. (2008) The conservation and ecology of the Bengal florican Houbaropsis bengalensis in Cambodia: grasslands, people and management. University of East Anglia.
Gray, T. N. E., Chamnan, H., Borey, R., Collar, N. J. and Dolman, P. M. (2007) Habitat preferences of a globally threatened bustard provide support for community-based conservation in Cambodia. Biol. Conserv. 138: 341350.
Gray, T. N. E., Chamnan, H., Collar, N. J. and Dolman, P. M. (2009a) Sex-specific habitat use by a lekking bustard: conserv implications for the critically endangered bengal florican (Houbaropsis bengalensis) in an intensifying agroecosystem. The Auk 126: 112122.
Gray, T. N. E., Collar, N. J., Davidson, P. J., Dolman, P. M., Evans, T. D., Fox, H. N., Chamnan, H., Borey, R., Hout, S. K. and Van Zalinge, R. N. (2009b) Distribution, status and conservation of the Bengal Florican Houbaropsis bengalensis in Cambodia. Bird Conserv. Internatn. 19: 114.
Hillard, R. (2012) Non-breeding habitat requirements and conservation threats to the Bengal florican (Houbaropsis bengalensis) in Cambodia. University of East Anglia, Norwich, United Kingdom.
Ibbett, H., Lay, C., Phlai, P., Song, D., Hong, C., Mahood, S. P. and Milner-Gulland, E. (2017) Conserving a globally threatened species in a semi-natural, agrarian landscape. Oryx 53: 181191.
Jha, R. R., Thakuri, J. J., Rahmani, A. R., Dhakal, M., Khongsai, N., Pradhan, N. M. B., Shinde, N., Chauhan, B. K., Talegaonkar, R. K. and Barber, I. P. (2018) Distribution, movements, and survival of the critically endangered Bengal Florican Houbaropsis bengalensis in India and Nepal. J. Ornithol. 159: 851866.
Mahood, S. P., Silva, J. P., Dolman, P. M. and Burnside, R. J. (2016) Proposed power transmission lines in Cambodia constitute a significant new threat to the largest population of the Critically Endangered Bengal florican Houbaropsis bengalensis. Oryx 52: 147155.
Mahood, S. P., Son, V., Chamnan, H. and Evans, T. D. (2012) The status of Bengal floricans in the Bengal Florican Conservation Areas, 2010/11 monitoring report. Phnom Penh: Wildlife Conservation Society, Cambodia Program.
Morales, M. B., Traba, J., Delgado, M., Morena, E. L. G. (2013) The use of fallows by nesting Little Bustard Tetrax tetrax females: implications for conservation in mosaic cereal farmland: El uso de los barbechos por las hembras de sisón común Tetrax tetrax: implicaciones para su conservación en mosaicos cerealistas. Ardeola 60: 8597.
Newton, I. (2006) Can conditions experienced during migration limit the population levels of birds? J. Ornithol. 147: 146166.
Norris, D. R., Marra, P. P., Kyser, T. K., Sherry, T. W. and Ratcliffe, L. M. (2004) Tropical winter habitat limits reproductive success on the temperate breeding grounds in a migratory bird. Proc. Roy. Soc. London B: Biol. Sci. 271: 5964.
Packman, C. E. (2011) Seasonal landscape use and conservation of a critically endangered bustard: Bengal florican in Cambodia. University of East Anglia.
Packman, C. E., Gray, T. N., Collar, N. J., Evans, T. D., Van Zalinge, R. N., Virak, S., Lovett, A. A. and Dolman, P. M. (2013a) Rapid loss of Cambodia’s grasslands. Conserv. Biol. 27: 245247.
Packman, C. E., Showler, D. A., Collar, N. J., Virak, S., Mahood, S. P., Handschuh, M., Evans, T. D., Chamnan, H. and Dolman, P. M. (2013b) Rapid decline of the largest remaining population of Bengal Florican Houbaropsis bengalensis and recommendations for its conservation. Bird Conserv. Internatn. 24: 429437.
R Core Team (2018) R: A language and environment for statistical computing. Vienna, Austria: R Foundation for Statistical Computing.
Rahmani, A. R., Khongsai, N., Rahman, A., Imran, M., Sagwan, T. and Ojah, S. (2016a) Conservation of threatened grassland birds of the Brahmaputra Floodplains. Mumbai: Bombay Natural History Society.
Rahmani, A. R., Rahman, A., Imran, M., Sagwan, T. and Khongsai, N. (2016b) D’Ering Memorial Wildlife Sanctuary: Report of Summer Survey in 2016. Mumbai: Bombay Natural History Society.
Royal Government of Cambodia (2013) Rectangular strategy for growth, equity and efficiency. Phase III. Phnom Penh, Cambodia.
Székely, T., Liker, A., Freckleton, R. P., Fichtel, C. and Kappeler, P. M. (2014) Sex-biased survival predicts adult sex ratio variation in wild birds. Proc. Roy. Soc. London B: Biol. Sci. 281: 20140342.
Vanna, L. (2002) Rice remains in the prehistoric pottery tempers of the shell midden site of Samrong Sen: Implications for early rice cultivation in central Cambodia. Aséanie, Sciences humaines en Asie du Sud-Est 9: 1334.
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Bird Conservation International
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