Media Statement: Deforestation for durian plantations poses serious long-term risks to industry’s productivity and profitability

Download the statement in pdf format: Deforestation for durian plantations poses serious long-term risks to industry_s productivity and profitability

Kuala Lumpur, 25 October – We refer to the recent news report by The Star’s Sim Leoi Leoi and Ong Han Sean: ‘Jungle’s goodness gone – and it’s legal’, on 23 October 2018. We are concerned that the durian, Southeast Asia’s beloved ‘king of fruits’ and such a culturally significant element of this region, is turning into the next new monoculture crop driving yet more deforestation and biodiversity loss in Malaysia.

This not only causes the destruction of critical habitat for wide-ranging animals such as tigers, elephants, primates, and hornbills – it also reduces the numbers of the very pollinators that are necessary for durian fruit production, and which the durian industry therefore heavily relies on for profit.

durian for sale_PMF.jpg
Musang King durians for sale in Peninsular Malaysia. COPYRIGHT: PIERRE-MICHEL FORGET

Unlike other monoculture crops such as oil palm and rubber, the Durio zibethinus durian tree is native to Malaysia, a natural component of our unique tropical ecosystem. As it cannot self-pollinate, it requires a specific native pollination system that has evolved over millennia, which involves a unique, complex, and specialised set of interactions between the tree and the wild animal pollinators that it depends on. Research has shown that the only truly efficient natural pollinators of the durian trees are the plant-visiting bats of the family Pteropodidae (see Project Pteropus press release: ‘Durian industry may suffer without endangered fruit bats’ for further information).

Commonly referred to as ‘fruit bats’, this vitally important animal group is the most effective at performing natural durian pollination, providing an essential and irreplaceable service to the durian industry for free. Yet Malaysia’s long-distance durian pollinators, the giant fruit bats known as flying foxes (Pteropus hypomelanus and Pteropus vampyrus), are already severely threatened by hunting. Any further removal of their forest habitat and food resources will continue to reduce the effectiveness of their role in durian fruit production. On top of this, the durian-pollinating Cave Nectar Bat (Eonycteris spelaea) is threatened by uncontrolled limestone quarrying. Any removal of forest around or near limestone karsts will reduce the habitat suitability of these caves, and will also prevent the bats from travelling further to the durian farms that are in need of pollination.

Video-trap footage showing a flying fox pollinating durian flowers. COPYRIGHT: RIMBA

Although there is some preliminary research suggesting that the Asian Giant Honeybee (Apis dorsata) can also serve as a secondary pollinator in areas with no bat pollinators, it is restricted to a strictly supporting role with greatly reduced fruit production – and this threatened insect group is also highly dependent on pristine rainforest habitat for its survival.

Therefore, destroying pollinator habitats and food resources in order to establish durian monoculture simply does not make good business sense. Companies that engage in this practice are prematurely destroying the very future profits that they hope to derive from their durian business in the first place. In the absence of our native, natural pollinators of durian trees, farmers would have to invest extra time, labour, and money to hand-pollinate their trees.

Giant honeybee (Apis dorsata) feeding on pollen of durian. COPYRIGHT: SHEEMA AZIZ / RIMBA

Other serious impacts of deforestation, such as carbon emissions, soil erosion, sedimentation, loss of water supply, increased flood risks, etc., are already well documented and have been repeatedly highlighted. Moreover, planting of durian in inappropriate locations such as hillsides could potentially cause landslides (‘Residents scoff at proposal to plant durian trees at Gunung Panjang’, Malay Mail, 5 December 2017). On top of this, Musang King plantations are now also encroaching on the rights of indigenous Orang Asli communities, and threatening their livelihoods and traditions (‘Musang King durian plantation owners blockade jungle roads of orang asli’, The Star, 31 July 2018).

We therefore wish to highlight, reiterate, and emphasise this very serious impact of durian-driven deforestation to all relevant parties. We call on the Ministry of Agriculture and Agro-based Industry, the Department of Agriculture, the wider durian industry, and individual durian farmers to think long-term and pursue good agricultural practices for growing durian that is sustainable, contributes to healthy ecosystems, and provides a future for the Malaysian durian industry and Malaysian durian lovers.

Suggested practices are to prioritise converting previously tended agricultural land to durian orchards rather than clearing native forest for durian farming, establishing new durian plantings in appropriately situated areas, avoiding pure monocrops by intercropping with other fruit trees, and integrating low-impact and organic practices into pest and tree management. Such methods will ensure the preservation of the pollinator habitat and food resources that will help attract the necessary animal pollinators to durian farms. By ensuring the survival of these crucial pollinator communities, this will also help to guarantee the long-term longevity and viability of our local durian industry.

Such conservation and sustainable use of Malaysia’s wild durian pollinators is in line with the Principles and Goals of our country’s National Policy on Biological Diversity (2016-2025), which falls under the purview of the Ministry of Water, Land and Natural Resources (KATS). Also, as Malaysia is a signatory to the Convention on Biological Diversity (CBD), and a member of the Like-Minded Megadiverse Countries (LMMC), such a progressive move would also demonstrate Malaysia’s commitment to the CBD’s explicitly identified priority on the ‘Conservation and Sustainable Use of Pollinators’. Indeed, the CBD states (see also

“The overall objective of this plan of action is to promote coordinated action worldwide to safeguard wild and managed pollinators and promote the sustainable use of pollination services, which is a recognized vital ecosystem service for agriculture and for the functioning and health of ecosystems.”

As such, we invite all relevant and interested parties to work with us on a coordinated and collaborative initiative to identify, encourage, support, and promote durian production practices that are deforestation-free, biodiversity-friendly, and respectful of indigenous rights. This would be a particularly fitting time to start taking action, as the week of 24-31 October this year is the official International Bat Week.

Island Flying Fox (Pteropus hypomelanus) on Tioman Island, Malaysia_COPYRIGHT SHEEMA AZIZ.jpg
Island Flying Fox (Pteropus hypomelanus) on Tioman Island, Malaysia. COPYRIGHT: SHEEMA AZIZ / RIMBA


Dr. Sheema Abdul Aziz, Co-founder & President, Rimba (email sheema AT rimbaresearch DOT org)

Lindsay Gasik, Durian Tour Organizer (Instagram @durianwriter; email lindsay AT yearofthedurian DOT com)

Signed in support:

  1. Miss Ng Wen Qing (Nuvista)
  2. Mr. Surin Suksuwan (Member, IUCN World Commission on Protected Areas)
  3. Ms. Justine Vaz (General Manager, The Habitat Foundation)
  4. Dr. Yong Kien Thai (University of Malaya)
  5. Loo Jey Sern (Student, University of Nottingham Malaysia Campus)
  6. Mr. Arvind Devadasan (Student, Universiti Sains Malaysia)
  7. Mrs. Joanna de Rozario (NTFP-EP – Non-Timber Forest Products Exchange Programme)
  8. Dr. Nur Atiqah (MCKC – Malaysia Cave and Karst Conservancy)
  9. Mr. Raphe van Zevenbergen (Co-Founder, Lang Tengah Turtle Watch)
  10. Ms. Ummi Nadiah Rosli (Project Leader, Communications; The Forest Trust)
  11. Mr. Mohd Abdul Muin Md Akil (Universiti Sains Malaysia)
  12. Mr. Lau Chai Ming (Reef Check Malaysia)
  13. Miss Elisa Panjang (Danau Girang Field Centre)
  14. Miss Long Seh Ling (Universiti Malaysia Terengganu)
  15. Ms. Natasha Zulaikha (Conservation Officer, MYCAT – Malaysian Conservation Alliance for Tigers)
  16. Mr. Nicholas Tan Wei Cheng (Universiti Sains Malaysia)
  17. Mr. Sim Kee Kong (The Forest Trust)
  18. Dr. Jarina Mohd Jani (Universiti Malaysia Terengganu)
  19. Dr. Dzaeman Dzulkifli (Tropical Rainforest Conservation and Research Center)
  20. Ms. Celine Ch’ng (Independent)
  21. Ken Yeong (Innovation Manager, The Forest Trust)
  22. Mr. Mohamad Izereen Amat Mukri (Merapoh Rainforest Station, Fuze-Ecoteer)
  23. Mr. Prasad Vasudevon (Independent)
  24. Ms. Alicia Solana Mena (MEME – Management and Ecology of Malaysian Elephants)
  25. Miss Aini Hasanah Abd Mutalib (Malaysian Primatological Society; Universiti Sains Malaysia)
  26. Mr. Rushan Abdul Rahman (Data For A Cause)
  27. Mr. Daniel Quilter (Merapoh Rainforest Station)
  28. Nazirul Amin Azmi (Reef Check Malaysia)
  29. Ms. Stephanie Santigo (APE Malaysia)
  30. Ms. Ange Tan (Project Coordinator, Wild Asia)
  31. Mrs. Noorainie Awang Anak (Independent)
  32. Dr. Forest Ang (Independent)
  33. Dr. Nadine Ruppert (Senior Lecturer, Universiti Sains Malaysia)
  34. Ms. Nur Izzati Roslan (Juara Turtle Project)
  35. Dr. Reza Azmi (Executive Direction & Founder, Wild Asia)
  36. Dr. Yek Sze Huei (Senior Lecturer, Monash University Malaysia)
  37. Dr. Mohd-Azlan Jayasilan (Associate Professor, Universiti Malaysia Sarawak)
  38. Mr. Ronald Oblander (Independent, former Peace Corps volunteer in Sarawak)

UPDATE: Read media coverage of our statement:

The Star: ‘Durian farmers pay the price in the end’

Malay Mail: Weighing in on bats and durians


Press Release: New State Park to Strengthen Biodiversity Protection in Malaysia

KUALA TERENGGANU, 15 August – Malaysia’s Terengganu state government announced today that it has designated 10,386 hectares of land formerly slated for logging as a new protected area for conservation. This new state park in the Kenyir region of Terengganu is phase one of a much larger conservation project that lies within a globally important Tiger Conservation Landscape and critical wildlife corridor.


The creation of this protected area and its ongoing management is a collaborative effort involving the Terengganu state government, and local nonprofit organization Rimba, in partnership with Rainforest Trust and Panthera/Woodland Park Zoo.

“This new protected area not only brings more key wildlife habitat under protection, but also protects vital forested watersheds that provide important ecosystem services to the people of Terengganu,” said Dr. Sheema Abdul Aziz, President of Rimba.

Estimated at more than 130 million years old, the dipterocarp forest in the Lawit-Cenana State Park is now protected from logging and secured from further development.

“The importance of this area simply cannot be underestimated,” said Rainforest Trust Chief Executive Officer Dr. Paul Salaman. “The creation of the new park is a rare and unparalleled opportunity to protect a spectacular and imperiled tropical forest harboring what is certainly one of the planet’s most awe-inspiring predators – the Critically Endangered Malayan Tiger.”

The forests of the new park contain some of the highest biodiversity in Asia and are home to 18 highly threatened mammal species, including the Asian Elephant, Sunda Pangolin, Asian Tapir, Dhole and White-handed Gibbon. Six of Malaysia’s eight wild cat species prowl these forests, including the Malayan Tiger.

“These apex predators face tremendous pressure from poaching, fuelled by the illegal trade in their body parts for traditional Chinese medicine,” said Dr. Gopalasamy Reuben Clements, lead investigator of Rimba’s Harimau Selamanya project and Associate Professor at Sunway University. Continue reading

Updates to WWF Camera-trap database

Hi all!

Since Shariff Wan Mohamad from WWF-Malaysia originally posted his camera-trap database in Rimba’s Biologist Toolbox in 2012, a number of data management solutions have been developed by various researchers and organisations; some of which are freely available online. To join in the fun, he has decided to post a long overdue updated version of his camera-trap database, which he only just recently finalised. Some of the main improvements integrated into this database are listed below:

  • Added the ability to automatically fill up subsequent records of the same event based on customisable time interval between photos
  • Added a function to automatically filter records into independent events based on customisable time interval
  • Added direct output of daily capture matrix files for PRESENCE and SECR
  • Added an option to physically export good photos and photos of selected species to a folder in Windows
  • Added a more detailed user guide

You can download version 161018 of the database here.

You can also download the same database with some sample data here, to see how the outputs look like.


Inputting data into the database is relatively simple; you only have to fill in two forms – one for camera-trap locations and one for the photo data. The results will be compiled automatically. However, make sure to read the data entry guide in the database beforehand! If your existing camera-trapping data are in MS Excel spreadsheets or a similar format, it can be imported into this database.


Shariff won’t go into details about the summaries and analysis outputs; you can see the results for yourself in the database which contains sample data. Most of the outputs are pretty basic and easy to understand. Some of the main automated outputs are:

  • Trapping efforts
  • Distance between camera-trap locations
  • Naïve occupancy
  • Relative abundance
  • Activity patterns
  • Occupancy matrix for input into software PRESENCE
  • Data sheets for population density analysis in SECR


As mentioned earlier, there are already a number of camera-trap database solutions currently available. Shariff recommends testing out these alternatives before deciding on which one to use, or even before choosing to develop your own. The best way to gauge which solution is best would be to input a sample of your data into the database and see what the outputs look like – then you would be able to assess whether it is suitable for your use or not.

If you don’t have MS Access the data entry can still be run via a free version called MS Access Runtime, although there are limitations in customizing or editing the database. The current version of this database was tested on MS Access 2016 (32 bit and 64 bit) on the Windows 10 platform.

Anyway that’s the general overview of Shariff’s database; if you have any inquiries then he is willing to assist in any way he can. If the results of this database are used for any publications or reports, please credit WWF-Malaysia. Hope this helps!

Shariff can be contacted at: shariff1mohamad AT gmail DOT com.