Impacts of rodent outbreaks on food security in Asia
Grant R. Singleton A D , Steven Belmain B , Peter R. Brown C , Ken Aplin C and Nyo Me Htwe A
+ Author Affiliations
- Author Affiliations
A International Rice Research Institute, Crop and Environmental Sciences Division, DAPO, Box 7777, Metro Manila, Philippines.
B Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK.
C CSIRO Sustainable Ecosystems, GPO Box 284, Canberra, ACT 2601, Australia.
D Corresponding author. Email: g.singleton@cgiar.org
Wildlife Research 37(5) 355-359 https://doi.org/10.1071/WR10084
Submitted: 19 May 2010 Accepted: 31 May 2010 Published: 11 August 2010
Abstract
Since 2007, a spate of rodent outbreaks has led to severe food shortages in Asia, affecting highly vulnerable and food-insecure families. Little has been documented about wildlife-management issues associated with these outbreaks. The aims of the present study were to synthesise what we know about rodent outbreaks in Asia, and identify important gaps in our knowledge. We compiled information from agencies of the United Nations, non-government organisations and the authors. The authors conducted site visits to areas affected by outbreaks of rodent populations, and convened an international conference in October 2009 to share knowledge. Bamboo masting is clearly implicated as the primary cause of the rodent-population outbreaks that led to severe food shortages in Mizoram (India), Chin State (Myanmar), Chittagong Hill Tracts (Bangladesh) and upland provinces of Lao PDR. In Laos, emergency food assistance was required for 85 000–145 000 people. In 2009, high rodent losses occurred also in lowland irrigated rice-based systems in the Philippines, Myanmar and Indonesia, not related to bamboo masting. Asynchronous or aseasonal growing of rice crops was a common element in these outbreaks. In the Ayeyarwaddy delta, Myanmar, 2.6 million rats were collected in 3 months through community activities; this outbreak appeared to be related to an extreme climatic event, Cyclone Nargis. There are two key features of rodent outbreaks that make the future uncertain. First, climate change and extreme climatic events will increase impacts of rodents on agricultural production. Second, there is food-security pressure in some countries to grow three crops per year. Increased cropping intensity will reduce fallow periods and create ideal conditions for rodents to breed nearly continuously. Implications of the research are as follows: (i) rodent outbreaks are a consequence of enhanced reproduction and natural mortality is of minor importance, particularly with rapidly increasing populations; therefore, we need to focus more on methods for disrupting reproduction; (ii) a stronger understanding of the ecology of pest species and community dynamics will enable ecologically sustainable management; (iii) we need landscape approaches that focus on crop synchrony, and timely coordinated community action to manage pest species and conserve desirable species; and (iv) a simple monitoring system can help implement ecologically based rodent management.
Acknowledgements
We thank Charles Krebs for his insightful comments on the manuscript.
References
Aplin
K. P.
,
Brown
P. R.
,
Singleton
G. R.
,
Douang Boupha
B.
, and
Khamphoukeo
K.
(2006). Rodent ecology in the rice environments of Laos. In ‘Rice in Laos’. (Eds J. M. Schiller, M. B. Chanphengxay, B. Linquist and S. Appa Rao.) pp. 291–308. (International Rice Research Institute: Los Baños, Philippines.)
Bartley
H. C.
(1911). ‘Studies in the Art of Rat Catching.’ (John Murray: London.)
Belmain
S. R.
,
Ali
M. S.
,
Azad
A. K.
,
Chakma
L. C.
,
Dewan
U.
,
et al
(2008). Scientific assessment report on bamboo flowering, rodent outbreaks and food security: rodent ecology, pest management, and socio-economic impact in the Chittagong Hill Tracts, Bangladesh. November 2008. United Nations Development Programme, Bangladesh. Available at http://www.nri.org/projects/bandicoot/docs/bamboo.pdf [accessed April 2010].
Brown, P. R. , and Khamphoukeo, K. (2010). Changes in farmers’ knowledge, attitudes and practices after implementation of ecologically-based rodent management in the uplands of Lao PDR. Crop Protection 29, 577–582.
| Crossref | GoogleScholarGoogle Scholar |
Buckle
A. P.
, and
Smith
R. H.
(Eds) (1994). ‘Rodent Pests and Their Control.’ (CAB International: Wallingford, UK.)
Cowan, D. A. , and Hinds, L. A. (2008). Preface. Wildlife Research 35, iii–iv.
| Crossref | GoogleScholarGoogle Scholar |
Departemen Pertanian (2008). ‘Peningkatan Produksi Padi Menuju 2020.’ (Departemen Pertanian: Jakarta, Indonesia.) [In Indonesian]
Easterling
W. E.
,
Aggarwal
P. K.
,
Batima
P.
,
Brander
K. M.
,
Erda
L.
,
et al
(2007). Food, fibre and forest products. In ‘Climate Change 2007: Impacts, Adaptation and Vulnerability’. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. (Eds M. L. Parry, O. F. Canziani, J. P. Palutikof, P. J. van der Linden and C. E. Hanson.) pp. 273–313. (Cambridge University Press: Cambridge, UK.)
FAO (2009). ‘The State of Food Insecurity in the World 2009. Economic Crises – Impacts and Lessons Learned.’ (Food and Agriculture Organization of the United Nations, Electronic Publishing Policy and Support Branch Communication Division FAO: Rome.) Available at http://www.fao.org/publications/sofi/en/ [accessed January 2010].
Harmeling
S.
(2009). ‘Global Climate Risk Index 2010. Who is Most Vulnerable? Weather Related Loss Events Since 2009 and How Copenhagen Needs to Respond.’ (Germanwatch: Bonn, Germany.) Available at http://www.germanwatch.org/klima/cri2010.pdf [accessed January 2010].
Hellen Keller International (2008
a). Needs assessment report on bamboo flowering, rat infestation and food scarcity in the Chittagong Hills Tracts, Bangladesh. April 2008. Helen Keller International, Bangladesh, for United States Agency for International Development (USAID). Available at http://www.nri.org/projects/bandicoot/docs/HKUSAIDApr08.pdf [accessed April 2010].
Hellen Keller International (2008
b). Food and nutrition survey of two rodent-affected districts in the CHT. September 2008. Helen Keller International, Bangladesh, for United Nations Development Programme. Available at http://www.nri.org/projects/bandicoot/docs/HKIsept08.pdf [accessed April 2010].
Heong
K. L.
, and
Hardy
B.
(Eds) (2009). ‘Planthoppers New Threats to the Sustainability of Intensive Rice Production Systems in Asia.’ (International Rice Research Institute: Los Baños, Philippines.)
Jacob, J. , Sudarmaji,
, Singleton, G. R. , Rahmini,
, Herawati, N. A. , and Brown, P. R. (2010). Ecologically based management of rodents in lowland irrigated rice fields in Indonesia. Wildlife Research 37, 418–427.
| Crossref | GoogleScholarGoogle Scholar |
Kenney
A. J.
,
Krebs
C. J.
,
Davis
S.
,
Pech
R.
,
Mutze
G.
, and
Singleton
G. R.
(2003). Predicting house mice outbreaks in the wheat-growing areas of south-eastern Australia. In ‘Rats, Mice and People: Rodent Biology and Management’. (Eds G. R. Singleton, L. A. Hinds, C. J. Krebs and D. M. Spratt.) pp. 325–328. (ACIAR: Canberra.)
Leung
L. K.-P.
,
Singleton
G. R.
,
Sudarmaji
, and
Rahmini
(1999). Ecologically-based population management of the rice-field rat in Indonesia. In ‘Ecologically-based Management of Rodent Pests’. (Eds G. R. Singleton, L. A. Hinds, H. Leirs and Z. Zhang.) pp. 305–318. (ACIAR: Canberra.)
Maclean
J. L.
,
Dawe
D. C.
,
Hardy
B.
, and
Hettel
G. P.
(Eds) (2002). ‘Rice Almanac.’ (International Rice Research Institute: Los Baňos, Philippines.)
Meerburg, B. G. , Singleton, G. R. , and Leirs, H. (2009a). The year of the rat ends – time to fight hunger! Pest Animal Science 65, 351–352.
| Crossref | GoogleScholarGoogle Scholar |
Ong
P. S.
, and
Rickart
E. A.
(2008). Ecology of native and pest rodents in the Philippines. In ‘Philippine Rats: Ecology and Management’. (Eds G. R. Singleton, R. C. Joshi and L. S. Sebastian.) pp. 101–115. (Philippine Rice Research Institute: Science City of Muñoz, Neuva Ecija, Philippines.)
Palis
F. G.
,
Singleton
G. R.
, and
Flor
R. J. B.
(2008). Humans outsmarting rodents: adoption and impact of ecologically based rodent management in Asia. In ‘Philippine Rats: Ecology and Management’. (Eds G. R. Singleton, R. C. Joshi and L. S. Sebastian.) pp. 127–141. (Philippine Rice Research Institute: Science City of Muñoz, Neuva Ecija, Philippines.)
Prakash
I.
(Ed.) (1988). ‘Rodent Pest Management.’ (CRC Press: Boca Raton, FL.)
Schiller
J. M.
,
Douang Boupha
B.
, and
Bounnaphol
O.
(1999). Rodents in agriculture in the Lao PDR – a problem with an unknown future. In ‘Ecologically-based Management of Rodent Pests’. (Eds G. R. Singleton, L. A. Hinds, H. Leirs and Z. Zhang.) pp. 372–387. (ACIAR: Canberra.)
Sinclair, A. R. E. , Olsen, P. D. , and Redhead, T. D. (1990). Can predators regulate small mammal populations? Evidence from house mouse outbreaks in Australia. Oikos 59, 382–392.
| Crossref | GoogleScholarGoogle Scholar |
Singleton
G. R.
(2003). Impacts of rodents on rice production in Asia. IRRI Discussion Paper Series No. 45, 30 pp. (International Rice Research Institute: Los Baños, Philippines.) Available at http://books.irri.org/971220183X_content.pdf [accessed April 2010].
Singleton
G. R.
,
Hinds
L. A.
,
Leirs
H.
, and
Zhang
Z.
(Eds) (1999). ‘Ecologically-based Rodent Management.’ ACIAR Monograph 59. (ACIAR: Canberra.)
Singleton, G. R. , Brown, P. R. , and Jacobs, J. (2004). Ecologically-based rodent management – effectiveness in cropping systems in Southeast Asia. Netherlands Journal of Agricultural Science 52, 163–171.
Stuart
A. M.
,
Prescott
C. V.
, and
Singleton
G. R.
(2008). Biology and management of rodent communities in complex agroecosystems – lowlands. In ‘Philippine Rats: Ecology and Management’. (Eds G. R. Singleton, R. C. Joshi and L. S. Sebastian.) pp. 37–55. (Philippine Rice Research Institute: Science City of Muñoz, Neuva Ecija, Philippines.)
Sudarmaji
S. G. R.
,
Brown
P. R.
, and
Jacob
J.
(2010). Rodent impacts in lowland irrigated intensive rice systems in West Java, Indonesia. In ‘Rodent Outbreaks – Ecology and Impacts’. (Eds G. R. Singleton, S. R. Belmain, P. R. Brown and W. Hardy.) In press. (International Rice Research Institute: Los Baños, Philippines.)
Vibe-Petersen, S. , Leirs, H. , and De Bruyn, L. (2006). Effects of predation and dispersal on Mastomys natalensis population dynamics in Tanzanian maize fields. Journal of Animal Ecology 75, 213–220.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
World Food Program (2009). ‘Rodent Outbreaks in the Northern Uplands Lao PDR.’ March 2009. (World Food Program Emergency Food Security Assessment: Vientiane, Lao PDR.)
Zohir
S.
(2008). ‘In Search of the Pied Piper: Rapid Assessment of Impact of Rat Infestation on Livelihoods in the CHT Region.’ May 2008. (Save the Children UK: Bangladesh.) Available at http://www.nri.org/projects/bandicoot/docs/SCUKMay08.pdf [accessed April 2010].
