Merlijn van Weerd
Lecturer
- Name
- Drs. M. van Weerd
- Telephone
- +31 71 527 2727
- m.van.weerd@cml.leidenuniv.nl
- ORCID iD
- 0000-0002-7173-3725
Merlijn van Weerd is an ecologist studying biodiversity distribution and richness patterns, the impact of human activities on biodiversity and the effectiveness of biodiversity conservation. He is a part-time lecturer at both the Faculties of Science and Social Science and leads the Mabuwaya Foundation, a Philippine conservation NGO.
More information about Merlijn van Weerd
News
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Students work with local community -
Thinking outside your scientific box -
Area studies of the Minor Sustainable Development in four countries -
International press attention for the Agta -
Beestieboys visit Philippine crocodile project -
Managing water is managing the future -
CML researcher Merlijn van Weerd wins Parker/Gentry Award 2015 -
Discovery of a new Philippine monitor lizard (Varanus bitatawa) -
New chance for the Philippine crocodile
Professional experience
Merlijn van Weerd graduated in 1996 at the University of Groningen with a MSc (Drs.) degree in biology, specialization animal ecology. During his studies, he conducted ecological research on the Dutch island of Schiermonnikoog on vegetation dynamics and the behavioural ecology of Oystercatchers and Brent Geese. In Mozambique he studied shore birds and their estuarine food supplies. As a visiting student at the Institute of Environmental Science (CML) of Leiden University, he conducted fieldwork in Cameroon on the impact of floodplain restoration on water bird populations.
After graduation, Merlijn continued fieldwork on Schiermonnikoog on the breeding biology of Oystercatchers for the University of Groningen. In 1998 he was ecologist for the CML at the Waza-Logone project in Cameroon studying freshwater fish migration and conducting bird and mammal surveys. From 1999 - 2003 he was employed by the Dutch Ministry of Foreign Affairs as a wildlife biologist at the Northern Sierra Madre Natural Park – Conservation Project in Luzon, the Philippines. Within this Dutch-funded integrated conservation and development project, Merlijn trained local wildlife researchers, conducted biodiversity surveys of birds, mammals, amphibians, reptiles, freshwater fish and butterflies, studied wildlife resource utilization and assisted in the development of conservation and natural resource management plans for the region.
In 2003, Merlijn joined CML again as a researcher on biodiversity distribution patterns and biodiversity change in the Philippines and as a lecturer in various Minor and Master courses. From 2007 – 2010, Merlijn was the coordinator of the CML field station in the Philippines. Since 2010, he is also connected to the Department of Anthropology and Development Sociology (CA-DS) of the Faculty of Social Sciences of Leiden University as lecturer and organizer of the joint CML/CA-DS annual field course on sustainability in the Philippines. In addition, he leads the Mabuwaya Foundation, a Philippine non-profit biodiversity conservation organization. He is a member of the IUCN Species Survival Commission (Crocodile Specialist Group and Monitor Lizard Specialist Group) and the IUCN Commission on Education and Communication.
Research topic
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Biodiversity in tropical forest ecosystems at various spatial scales
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The impact of deforestation and forest fragmentation on tropical forest biodiversity
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The impact of climate change on forest ecosystems and biodiversity
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Local utilisation and management of natural resources
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Conservation of biodiversity at various organisational levels
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The impact of communication and education on the effectiveness of biodiversity conservation
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Status, ecology and conservation of the Philippine crocodile
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Wetlands and water-birds
Lecturer
- Science
- Centrum voor Milieuwetenschappen Leiden
- CML/Environmental Biology
- Brown J.C., Shirley M.H., Yog-yog A., Weerd M. van, Balbas M.G., Tarun B.A. & Siler C.D. (2021), Use of diet and body condition assessments as intermediate indicators of translocation success in the Critically Endangered Philippine crocodile (Crocodylus mindorensis), Aquatic Conservation: Marine and Freshwater Ecosystems 31(10): 2817-2829.
- Weerd M. van et al. (2021), Testing a global standard for quantifying species recovery and assessing conservation impact, Conservation Biology 35(6): 1833-1849.
- Doyog N.D., Lumbres R.I.C., Weerd M. van & Baoanan Z.G. (2021), Non-linear tree height (h-d) model development and forest resource productivity assessment of Diguyo limestone forest within Northern Sierra Madre Natural Park, Philippine: Journal of Science 150(6A): 1517-1530.
- Taggueg J.B., Guzman Jr. L.S., Soriano L.S., Acay J.T. & Weerd M. van (2019), An inland record of Red-tailed Tropicbird Phaethon rubricauda in the wake of typhoon Mangkhut in northern Luzon, Philippines, Birding Asia 31: 68-69.
- Weerd M. van, Gatan-Balbas M., Luning S. & Taggueg J. (2019), International course on water and water management in the Philippines: 6 January - 1 February 2019. Leiden, the Netherlands and Cabagan, the Philippines: Leiden University, Isabela State Universit and the Mabuwaya Foundation.
- Groffen J., Ploeg J. van der, Telan S.P. & Weerd M. van (2018), Rhinella Marina. Predation by a Philippine crocodile, Herpetological Review 49(3): 520-521.
- Law S.J., Kort S.R. de, Bennett D. & Weerd M. van (2018), Diet and Habitat Requirements of the Philippine Endemic Frugivorous Monitor Lizard Varanus bitatawa, Biawak 12(1): 12-22.
- Weerd M. van, Gatan-Balbas M., Verheijen J. & Mangabat c. (2018), International course on water and water management in the Philippines: 4 January - 2 February 2018. Leiden, the Netherlands and Cabagan, the Philippines: Leiden University, Isabela State University and the Mabuwaya Foundation.
- Ploeg J. van der, Vermeersch L., Rodriguez D., Balbas M. & Weerd M. van (2017), Establishing freshwater protected areas to protect biodiversity and improve food security in the Philippines. In: Westlund L., Charles A., Garcia S.M. & Sanders J. (Eds.), Marine protected areas: Interactions with fishery livelihoods and food security. Rome: FAO and IUCN. 31-42.
- Daltry J.C., Langelet E., Solmu G.C., Ploeg J. van der, Weerd M. van & Whitaker R. (2017), Successes and failures of Crocodile harvesting strategies in the Asia pacific region. In: Aguirre A.A. & Sukumar R. (Eds.), Tropical conservation: Perspectives on local and global priorities. New York: Oxford University Press. 345-358.
- Weerd M. van, Gatan-Balbas M., Hagen R. & Servitillo J. (2017), International course on water and water management in the Philippines: 4 January - 31 January 2017. Leiden, the Netherlands and Cabagan, the Philippines: Leiden University, Isabela State University and the Mabuwaya Foundation.
- Persoon G.A. & Van Weerd M. (Eds.) (2016), The Mermaid: Essays in Honour of Hans H. de Iongh and the Lion King. Leiden: CML, Leiden University.
- Persoon G.A. & Weerd M. van (2016), The Mermaid and the Lion King - Essays in honour of Hans H. de Iongh. Zutphen: CPI.
- Weerd M. van, Taggueg J., Luning S., Masipiquena M., Kok R., Gatan-Balbas M., Osterhaus-Simic N. & Persoon G.A. (2016), The World of Water - The International Course on Water Use and Management in Cagayan Valley - The Philippines (2011-2015). Leiden: Institute of Cultural Anthropology and Development Sociology Leiden University.
- Law S.J., Kort S.R. de, Bennett D. & Weerd M. van (2016), Morphology, activity area, and movement patterns of the frugivorous monitor lizard Varanus Bitatawa, Herpetological Conservation and Biology 11(3): 467-475.
- Ploeg J. van der, Aquino D.M., Minter T. & Weerd M. van (2016), Recognising land rights for conservation tenure reforms in the Northern Sierra Madre, The Philippines, Conservation and Society 14(2): 146-160.
- Cureg M.C., Bagunu A.M., Weerd M. van, Balbas M.G., Soler D. & Ploeg J. van der (2016), A longitudinal evaluation of the Communication, Education and Public Awareness (CEPA) campaign for the Philippine crocodile Crocodylus mindorensis in northern Luzon, Philippines, International Zoo Yearbook 50(1): 68-83.
- Weerd M. van, Taggueg J., Luning S., Gatan-Balbas M., Servitillo J. & Persoon G. (2016), International course on water and water management in the Philippines: 5 January - 31 January 2016. Leiden, the Netherlands and Cabagan, the Philippines: Leiden University, Isabela State University and the Mabuwaya Foundation.
- Van Weerd M., Taggueg J., Osterhaus-Simić N., Gatan-Balbas M. & Persoon G.A. (2015), International Course on Water and Water Management in the Philippines 2015. Leiden University and Isabela State University. [lecture].
- Ploeg J. van der, Balbas M. & Weerd M. van (2015), Reforestation and producer organizations in the Philippines, ETRFN News 57: 84-90.
- Cureg M.C., Bagunu A.M., Balbas M.G., Soler D., Van Weerd M. & Van der Ploeg J. (2015), Reassessing the Effectiveness of Environmental Education: Mobilizing Community Support for Philippine Crocodile Conservation, Northern Philippines Journal 1(1): 60-73.
- Lowney A.M., Weerd M. van & Kort S.R. de (2015), Species rank of Isabela Oriole Oriolus isabellae and White-lored Oriole O. albiloris reinforced by song playback responses, Forktail 31: 113-116.
- De Alban J.D., Acay J., Gaschick F., Gomez R., Guinto A.F., Ledesma M., Mallari N.A., Masigan J.P., Monzon A.K., Pales J.R., Parinas M., Reyes S.R., Rico E.L., Supsup C., Tablazon D., Tumaneng R., Weerd M. van, Veridiano R.K., Wenceslao J.J.P.M., Monzon A.K., Pales J.R. & Parinas M. (2015), High conservation value areas as a strategic approach for protected area management in the Philippines. Manila: Fauna and Flora International.
- Van Weerd M., Taggueg J., Kok R.J., Pels P., Masipiguena M., Gatan-Balbas M. & Persoon G.A. (2014), International Course on Water and Water Management in the Philippines 2014. Leiden, Netherlands and Cabagan, Philippines. [lecture].
- Taggueg J., Weerd M. van & Telan S. (2014), Nest and nesting characteristics of Redcrested Malkoha Phaenicophaeus superciliosus cagayanensis, Birding Asia 21: 98-99.
- Hinlo M.R.P., Tabora J.H.G., Bailey C.A., Trewick S., Rebong G., Weerd M. van, Pomares C.C., Engberg S.E., Brenneman R.A. & Louis Jr.E.E. (2014), Population genetics implications for the conservation of the Philippine Crocodile Crocodylues Mindorensis Schmidt, 1935 (Crocodylia: Crocodylidae), Journal of Threatened Taxa 6(3): 5513-5533.
- Brown R., Siler C., Oliveras C., Welton L., Rock A., Swab J., Weerd M. van, Beijnen J. van, Jose E., Rodriquez D., Jose E. & Diesmos A. (2013), The amphibians and reptiles of Luzon Island, Philippines, VIII: the herpetofauna of Cagayan and Isabela Provinces, northern Sierra Madre Mountain Range, ZooKeys 266: 1-120.
- Groffen J., Parmentier H.K., Ven W.A.C. van de & Weerd M. van (2013), Effects of Different Rearing Strategies and Ages on Levels of Natural Antibodies in Saliva of the Philippine Crocodile, Asian Herpetological Research 4(1): 22-27.
- Snelder D.J.R.M., Weerd M. van, Zelfde M. van 't & Tamis W.L.M. (2013), Modelling the impact of climate and land use changes on forest bird species for adaptive management of the Northern Sierra Madre Natural Park (Philippines). Leiden: Institute of Environmental Sciences (CML).
- Weerd M. van & Van der Ploeg J. (2012), The Philippine crocodile: Ecology, culture and conservation. Cabagan: Mabuwaya Foundation.
- Koopmans F., Weerd M. van, Rodriquez D., Heitkonig I., Ven W. van de, Balbas M.G., Macadangdang A. & Van der Ploeg J. (2012), Philippine Crocodile Attacks on Livestock: Implications for Conservation. IUCN CSG (Ed.), Crocodiles. Proceedings of the 21st Working Meeting of the IUCN-SSC Crocodile Specialist Group. Crocodile Specialist Group Meeting 2012, Manila, Philippines. Gland: IUCN. 221-227.
- Pul N., Van der Ploeg J., Balbas M.G., Macadangdang A., Persoon G.A., Cureg M.C. & Weerd M. van (2012), Using participatory video filming to engage people in the conservation of the Philippine crocodile. IUCN CSG (Ed.), Crocodiles. Proceedings of the 21st Working Meeting of the IUCN-SSC Crocodile Specialist Group. Crocodile Specialist Group Meeting 2012, Manila, Philippines. Gland: IUCN. 59-63.
- Koopmans F., Weerd M. van, Rodriguez D., Heitkonig I., Ven W. van de, Balbas M., Macadangdang A. & Van der Ploeg J. (2012), Philippine Crocodile Attacks on Livestock: Implications for Conservation. IUCN CSG (Ed.), Crocodiles: Proceedings of the 21st Working Meeting of the Crocodile Specialist Group. Crocodile Specialist Group Meeting 2012, Manila, Philippines. Gland: IUCN. 221-227.
- Rodriguez D., Weerd M. van, Van der Ploeg J., Ven W. van de, Telan S., Balbas M. & Guerrero J. (2012), People's Attitudes Towards the Reintroduction of the Philippine Crocodile in Dicatian Lake. IUCN CSG (Ed.), Proceedings of the 21st Working Meeting of the Crocodile Specialist Group. Crocodile Specialist Group Meeting 2012, Manila, Philippines. Gland: IUCN. 105-110.
- Rodriquez D., Weerd M. van, Van der Ploeg J., Ven W. van de, Telan S., Balbas M.G. & Guerrero J. (2012), People’s Attitudes towards the Reintroduction of the Philippine Crocodile in Dicatian Lake. IUCN CSG (Ed.), Crocodiles. Proceedings of the 21st Working Meeting of the IUCN-SSC Crocodile Specialist Group. Crocodile Specialist Group Meeting 2012, Manila, Philippines. Gland: IUCN. 105-110.
- Van Weerd M., Masipiqueña M.D., Taggueg J.B., Luning S.W.J. & Persoon G.A. (2012), International course on water and water management in the Philippines: 3 January - 5 February 2012. Leiden: Leiden University and Isabela State University.
- Van der Ploeg J., Koopmans F., Cauilan-Cureg M., Rodriguez D., Ven W. van de, Balbas M.G., Arano R. & Weerd M. van (2012), Philippine crocodile attacks on humans in the Northern Sierra Madre, Crocodile Specialist Group Newsletter 31(2): 20-23.
- Villanueva R.J.T., Weerd M. van & Cahilog H. (2012), Odonata recorded in February 2012 in Isabela and Aurora Provinces, Luzon Island and Polillo Island, Philippines, International Dragonfly Fund-Report 49: 1-42.
- Laurance W.F., Weerd M. van & et al (2012), Averting biodiversity collapse in tropical forest protected areas, Nature 489: 290-294.
- Tabora J.A.G., Hinlo M.A.R.P., Bailey C.A., Lei R., Pomares C.C., Rebong G., Weerd M. van, Engberg S.E., Brenneman R.A. & Louis Jr. E.E. (2012), Detection of Crocodylus mindorensis x Crocodylus porosus (Crocodylidae) hybrids in a Philippine crocodile systematics analysis, Zootaxa 3560: 1-31.
- Villanueva L., Van der Ploeg J. & Weerd M. van (2011), Drepanosticta hamalaineni spec. nov and Sulcosticta sierramadrensis spec. nov from the Northern Sierra Madre Natural Park, Luzon, the Philippines (Zygoptera: Platystictidae), Odonatologica 40(4): 333-338.
- Ploeg J. van der, Cauilan-Cureg M., Weerd M. van & Groot W.T. de (2011), Assessing the effectiveness of environmental education: mobilizing public support for Philippine crocodile conservation, Conservation Letters 4(4): 313-323.
- Van der Ploeg J., Weerd M. van & Persoon G.A. (2011), A cultural history of crocodiles in the Philippines: Towards a new peace pact?, Environment and History 17(2): 229-264.
- Van der Ploeg J., Cauilan-Cureg M., Weerd M. van & Persoon G.A. (2011), 'Why must we protect crocodiles?' Explaining the value of the Philippine crocodile to rural communities, Journal of Integrative Environmental Sciences 8(4): 287-298.
- Van der Ploeg J., Weerd M. van, Masipiquena A.B. & Persoon G.A. (2011), Illegal logging in the Northern Sierra Madre Natural Park, the Philippines, Conservation and Society 9(3): 202-215.
- Van der Ploeg J., Arano R. & Weerd M. van (2011), What local people think about crocodiles: Challenging environmental policy narratives in the Philippines, The Journal of Environment & Development 20(3): 303-328.
- Weerd M. van & Udo de Haes H.A. (2010), Cross-taxon congruence in tree, bird and bat species distributions at a moderate spatial scale across four tropical forest types in the Philippines, Biodiversity and Conservation 19(12): 3393-3411.
- Welton L.J., Siler C.D., Bennett D., Diesmos A., Duya M.R., Dugay R., Rico E.L.B., Weerd M. van & Brown R.M. (2010), A spectacular new Philippine monitor lizard reveals a hidden biogeographic boundary and a novel flagship species for conservation, Biology Letters 6: 654-658.
- Weerd M. van, Buij R., Scholte P.T., Batakok E. & Tarla F.N. (2010), Rehabilitation of the Waza-Logone floodplain and its impact on birdpopulations (chapter 13). In: Iongh H.H. de, Persoon G.A., Buij R., Mvondo J.P., Croes B.M. & Tumenta P.N. (Eds.), Savannah Landscapes of the Future, celebrating 20 years of Environmental Research and Education in Northern Cameroon. Leiden: Center for Environment and Development studies in Cameroon. 115-120.
- Weerd M. van (2010), Philippine Crocodile Crocodylus mindorensis. In: Manolis S.C. & Stevenson C. (Eds.), Crocodiles. Status Survey and Conservation Action Plan. Third edition. Darwin: IUCN SSC Crocodile Specialist Group. 71-78.
- Van der Ploeg J. & Weerd M. van (2010), Agta bird names: an ethno-ornithological survey in the Northern Sierra Madre Natural Park, Philippines, Forktail 26: 127-131.
- Weerd M. van, Guerrero J., Balbas M.G., Telan S., Ven W. van de, Rodriquez D., Masipiqueña A.B., Van der Ploeg J., Antolin R., Rebong G. & Iongh H.H. de (2010), Reintroduction of captive-bred Philippine crocodiles, Oryx 44(1): 13-13.
- Cauilan-Cureg M., Van der Ploeg J., Weerd M. van, Udto R.G. & Balbas M.G. (2009), Philippine crocodile, something to be proud of. Manilla: Mabuwaya Foundation Inc..
- Admiraal J., Weerd M. van, Cauilan-Cureg M., Van der Ploeg J. & Balbas M.G. (2009), Manual on Philippine crocodile conservation. Manilla: Mabuwaya Foundation Inc..
- Persoon G.A., Weerd M. van, Aquino D.M. & Minter T. (2009), Value from the forest. In: Persoon G.A., Masipiqueña A.B., Ploeg J. van der, Masipiqueña M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Manila: CVPED. 107-115.
- Van der Ploeg J., Arano R., Top G.M. van den, Masipiqueña A.B., Weerd M. van & Macadangdang A. (2009), Logging the last forest. In: Persoon G.A., Masipiqueña A.B., Ploeg J. van der, Masipiqueña M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Manila: CVPED. 85-95.
- Arano R., Weerd M. van & Van der Ploeg J. (2009), The Northern Sierra Madre Natural Park. In: Persoon G.A., Masipiqueña A.B., Ploeg J. van der, Masipiqueña M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Manila: CVPED. 149-157.
- Van der Ploeg J., Rodriguez D., Masipiqueña A.B., Ven W. van de, Guerrero J., Iongh H.H. de, Telan S., Gatan-Balbas M., Boven G. van, Tarun B., Cauilan-Cureg M. & Weerd M. van (2009), Hope for the Philippine Crocodile. In: Persoon G.A., Masipiquena A.B., Ploeg J. van der, Masipiquena M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Manila: CVPED. 169-179.
- Persoon G.A., Masipiqueña A.B., Van der Ploeg J., Masipiqueña M.D. & Weerd M. van (2009), Research themes, projects and education. In: Persoon G.A., Masipiqueña A.B., Ploeg J. van der, Masipiqueña M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Manila: CVPED. 19-39.
- Weerd M. van & Araño R.R. (2009), A biodiversity hotspot. In: Persoon G.A., Masipiqueña A.B., Ploeg J. van der, Masipiqueña M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Cabagan: CVPED. 137-147.
- Lavieren H. van, Iongh H.H. de, Belen A. & Weerd M. van (2009), Managing coastal Resources. In: Persoon G., Ploeg J. van der, Masipiquena A. & Weerd M. van (Eds.), Crossing Boundaries. Manila: Studieo Graphics Corporation. 159-167.
- Weerd M. van, Snelder D.J.R.M., Spijkerman L. & Masipiqueña A.B. (2009), A bird's eye view of Northeast Luzon. In: Persoon G.A., Masipiqueña A.B., Ploeg J. van der, Masipiqueña M.D. & Weerd M. van (Eds.), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Cabagan: CVPED. 41-51.
- Cauilan-Cureg M., Balbas M.G., Van der Ploeg J. & Weerd M. van (2009), An update of the Philippine crocodile communication, education and public awareness campaign in the Northern Sierra Madre. Masipiqueña A.B., Weerd M. van & Udto R.G. (Eds.), Changing Landscapes. Proceedings of the sixth international conference on environment and development.. The sixth international conference on environment and development. Changing Landscapes. Manilla: CVPED. 293-317.
- Persoon G.A., Masipiqueña A.B., Van der Ploeg J., Masipiqueña M.D. & Weerd M. van (Eds.) (2009), Crossing Boundaries: celebrating 20 years of environmental research in Cagayan Valley and Sierra Madre. Manila: CVPED.
- Masipiqueña A.B., Weerd M. van & Udto R.G. (Eds.) (2009), Changing Landscapes. Proceedings of the sixth international conference on environment and development. Manilla: CVPED.
- Weerd M. van & Balbas M.G. (2009), Report support mission Mabuwaya Foundation to Wahana Bumi Hijau (WBH) in South Sumatra, Indonesia regarding the project: "protection of the Senyulong crocodile habitat in the Merang-Kepayang peat swamp forest". Cabagan: Mabuwaya Foundation Inc.
- Weerd M. van & Balbas M.G. (2009), Strengthening community-based wetland conservation in Cagayan Valley. Cabagan: Mabuwaya Foundation Inc.
- Van der Ploeg J. & Weerd M. van (2009), Northern Sierra Madre Natural Park: van prioriteit naar vergetelheid, Ecologie & Ontwikkeling 17(78): 34-36.
- Villanueva R.J., Van der Ploeg J. & Weerd M. van (2009), Some Odonata from the Northern Sierra Madre Natural Park, Isabela, Luzon, Philippines, Agrion 13(2): 72-74.
- Van der Ploeg J., Balbas M.G. & Weerd M. van (2009), Do crocodiles have rabies? Initiating a dialogue on in-situ crocodile conservation, Crocodile Specialist Group Newsletter 28(3): 8-10.
- Ven A.C. van de, Guerrero J.P., Rodriguez D.G., Telan S.P., Balbas M.G., Tarun B.A., Weerd M. van, Van der Ploeg J., Wijtten Z., Lindeyer F.E. & Iongh H.H. de (2009), Effectiveness of head starting to bolster Philippine crocodile Crocodylus mindorensis, Conservation Evidence 6(4): 111-116.
- Van der Ploeg J., Cureg M.C. & Weerd M. van (2008), Mobilizing public support for in-situ conservation of the Philippine crocodile in the Northern Sierra Madre: something to be proud of!, National Museum Papers 13(1-4): 68-94.
- Van der Ploeg J. & Weerd M. van (2008), Mens over dier: Operatie 'Free Isabela', Ecologie en Ontwikkeling 16(75): 70.
- Weerd M. van & Van der Ploeg J. (2008), Philippine crocodile hatchling head-start and re-enforcement program in San Mariano, Isabela Province, Luzon, the Philippines. In: Soorae P.S. (Ed.), Global re-introduction perspectives: re-introduction case-studies from around the globe. Abu Dhabi: IUCN/SCC Re-introduction Specialist Group. 79-83.
- Van der Ploeg J. & Weerd M. van (2008), Creating space for crocodiles: environmental governance in the Philippines. In: Santen J. van (Ed.), Development in Place: Perspectives and Challenges. Amsterdam: Askant. 214-246.
- Iongh H.H. de & Weerd M. van (2008), The use of avian guilds for monitoring Borneo lowland forests: methodology development for rapid assessment of avian communities. In: Persoon G.A. & Osseweijer M. (Eds.), Reflections on the Heart of Borneo. Wageningen: Tropenbos International. 49-68.
- Weerd M. van & Snelder D.J.R.M. (2008), Human-altered tree-based habitats and their value in conserving bird and bat diversity in Northeast Luzon, the Philippines. In: Snelder D.J.R.M & Lasco R.D. (Eds.), Smallholder tree growing for rural development and environmental services. Gainesville: Springer. 347-378.
- Van der Ploeg J. & Weerd M. van (2008), Crocodile rehabilitation, observance and conservation (CROC) project: the conservation of the critically endangered Philippine crocodile (Crocodylus mindorensis) in Northeast Luzon, the Philippines. Cabagan: Mabuwaya Foundation.
- Villamor G.B., Ambal R.G., Boffa J.-M., Brookes T., Cereno A., Coroza O., Lasco R.D., Schroth G. & Weerd M. van (2008), Setting landscape conservation targets and promoting them through compatible land use in the Philippines. Bogor, Indonesia: World Agroforestry Centre.
- Weerd M. van (Ed.) (2007), . Sylvatrop.
- Iongh H.H. de, Weerd M. van, Pieters S. & Wielstra B. (2007), Results of research on the use of Avian guilds for monitoring Bornean lowland forests. Iongh H.H. de, Persoon G.A. & Kustiawan W. (Eds.), Options for biodiversity conservation and sustainable use in lowland forests of Southeast Borneo. Workshop 19 May 2006 Leiden. Leiden: Tropenbos/CML/UNMUL. 171-196.
- Van der Ploeg J. & Weerd M. van (2007), A re-enforcement strategy for the critically endangered Philippine crocodile population in the Northern Sierra Madre: pilot project. Cabagan: Mabuwaya Foundation.
- Van der Ploeg J., Weerd M. van & Telan S. (2007), Cross visit to Liguasan marsh, Crocodile Specialist Group Newsletter 26(4): 11.
- Iongh H.H. de & Weerd M. van (2006), The use of avian guilds for the monitoring of tropical forest disturbance by logging. Wageningen: Tropenbos International.
- Weerd M. van (Ed.) (2006), . Sylvatrop.
- Van der Ploeg J. & Weerd M. van (2006), A paradigm shift in Philippine crocodile conservation, Crocodiles. Proceedings of the 18th working meeting of the Crocodile Specialist Group. 18th Meeting of the Crocodile Specialist Group, Montelimar, France. Gland/Cambridge: IUCN. 165-186.
- Weerd M. van & Van der Ploeg J. (2006), Report on the community-based crocodilian conservation workshop of the IUCN/SSC meeting 2006, Crocodiles. Proceedings of the 18th working meeting of the Crocodile Specialist Group. 18th working meeting of the Crocodile Specialist Group, Montelimar, France. Gland/Cambridge: IUCN. 392-402.
- Van der Ploeg J. & Weerd M. van (2006), Crocodiles in the mist. Persoon G.A., Barendse G.W.J. & Bezemer H. (Eds.), Sporen van een gedreven pionier. . Leiden: CML. 71-81.
- Weerd M. van, Van der Ploeg J., Rodriguez D., Guerrero J., Tarun B., Telan S. & Jonge J. de (2006), Philippine crocodile conservation in Northeast Luzon: an update of population status and new insights into Crocodylusmindorensis ecology. IUCN/SCC (Ed.), Proceedings of the 18th Working Meeting of the Crocodile Specialist Group. . Montélimar 305-320.
- Oliveros C., Telan S. & Weerd M. van (2006), Crocodile surveys on Dalupiri and Fuga. Manila: Isla Biodiversity Inc. and Mabuwaya Foundation Inc.
- Weerd M. van & Van der Ploeg J. (2006), Towards an ecosystem approach for the conservation of the Philippine crocodile. Final technical report to IUCN Small Grants Programme. Cabagan: Mabuwaya Foundation.
- Van der Ploeg J. & Weerd M. van (2006), Enlarged scales: strengthening Philippine crocodile conservation in the Sierra Madre corridor. Leiden: CML Department of Environment and Development (oud --> CML-CB).
- Persoon G.A. & Weerd M. van (2006), Biodiversity and natural resource management in insular Southeast Asia, Islands Studies Journal 1(1): 81-108.
- Iongh H.H. de & Weerd M. van (2005), A pantropical review of the impact of logging on avian guilds, and avian guild composition in three rainforest sites including the Northern Sierra Madre Natural Park, Philippines, Sylvatrop 15(1-2): 65-86.
- Van der Ploeg J. & Weerd M. van (2005), Contested crocodiles? Philippine crocodile conservation and indigenous peoples' rights in the Northern Sierra Madre. In: Ploeg J. van der & Masipiquena A.B. (Eds.), The future of the Sierra Madre; responding to social and ecological changes. Cabagan: Golden Press. 339-362.
- Weerd M. van (2005), Monitoring program Crocodile Rehabilitation, Observance and Conservation (CROC) Project. DENR-PAWB, CI, Haribon Foundation & FPE (Eds.), Proceedings of the national biodiversity monitoring workshop. Philippine national biodiversity monitoring workshop, Subic Bay, Philippines. Manila: DENR-PAWB, CI, Haribon Foundation and FPE. 1-11.
- Van der Ploeg J. & Weerd M. van (2005), Crocodile, Rehabilitation, Observance and Conservation (CROC) project. Cabagan: CVPED.
- Van der Ploeg J. & Weerd M. van (2005), The environment is not a crocodile: adopting an ecosystem approach for Philippine crocodile conservation in the municipality of San Mariano. Cabagan: CVPED.
- Oliveros C., Manalo R., Coñate Sr. E., Tarun B., Telan S. & Weerd M. van (2005), Philippine crocodile recorded on Dalupiri island, Crocodile Specialist Group Newsletter 24(3): 14-15.
- Weerd M. van & Van der Ploeg J. (2005), Ecosysteembenadering voor de bescherming van de Filippijnse krokodil, Ecologie & Ontwikkeling 69: 40-42.
- Weerd M. van & Van der Ploeg J. (2005), Continued Philippine crocodile conservation action in Northeast Luzon, Crocodile Specialist Group Newsletter 24(3): 12-14.
- Iongh H.H. de & Weerd M. van (2004), The use of avian guilds for monitoring responses to human intervention in tropical forests of the Philippines, Pilipinas: a Journal of Philippine Studies 43: 92-104.
- Weerd M. van & Van der Ploeg J. (2004), Surveys of wetlands and waterbirds in Cagayan Valley, Northern Luzon, Philippines, Forktail 20: 33-39.
- Weerd M. van, Boven G. van & Van der Ploeg J. (2004), Using communication to involve local communities and local governments in protected area management: two related cases from Northeastern Luzon, Philippines. In: Hamu D. & Auchincloss E. (Eds.), Communicating protected areas. Gland, Switzerland and Cambridge, UK: IUCN / Commission on Education and Communication. 139-154.
- Tarun B., Guerrero D., Rodriguez S., Telan M., Weerd M. van & Van der Ploeg J. (2004), The current distribution and population size of the Philippine crocodile and Estuarine crocodile in Northeast Luzon, the Philippines. The Crocodile Specialist Group (Ed.), Crocodiles, Proceedings of the 17th working meeting of the Crocodile Specialist Group. 17th working meeting of the Crocodile Specialist Group. Gland, Switzerland: IUCN. 166-173.
- Persoon G.A. & Weerd M. van (2004), Biodiversity and resource management in Southeast Asian Islands. Lee K.J. & Tsai H.-M. (Eds.), Islands of the World VIII: Changing Islands, Changing Worlds. Conference Kinmen Island. Taipeh: National University Taiwan. 65-97.
- Weerd M. van & Van der Ploeg J. (2004), Conservation of the Phillipine crocodile Crocodylus mindorensis in North East Luzon, the Philippines. An update. The Crocodile Specialist Group (Ed.), Crocodile, Proceedings of the 17th working meeting of the Crocodile Specialist Group. 17th working meeting of the Crocodile Specialist Group, IUCN. Gland, Switzerland: IUCN. 277-283.
- Miranda J.S.Q., Weerd M. van & Van der Ploeg J. (2004), Devolving crocodile conservation to the local level, the case of Philippine crocodile conservation in the municipality of San Mariano, Northeast Luzon, the Philippines. The Crocodile Specialist Group (Ed.), Crocodiles. Proceedings of the 17th working meeting of the Crocodile Specialist Group. 17th working meeting of the Crocodile Specialist Group. Gland, Switzerland: IUCN. 309-316.
- Weerd M. van (Ed.) (2004), . Agham Mindanao.
- Weerd M. van & Van der Ploeg J. (2004), Crocodile conservation action plan for the Northern Sierra Madre Natural Park. Cabagan: CVPED.
- Weerd M. van (2004), Het monster van de Sierra Madre, KIJK! 4: 62-64.
- Weerd M. van & Hutchinson R. (2004), Observations of Isabela Oriole Oriolus isabellae in the Sierra Madre, Luzon, the Philippines, with descriptions of the call, Forktail 20: 133-136.
- Weerd M. van & Van der Ploeg J. (2004), A new future for the Philippine crocodile, Sylvatrop 13(1&2): 31-50.
- Weerd M. van, Strijk J. & Snelder D.J.R.M. (2004), The importance of forest fragments for biodiversity conservation and local communities in Northeast Luzon, Philippines, Sylvatrop 13(1&2): 1-30.
- Van der Ploeg J. & Weerd M. van (2004), Devolution of natural resource management and Philippine crocodile conservation in San Mariano, Isabela, Philippine Studies 52(3): 346-383.
- Weerd M. van, Guerrero J.P., Tarun B.A. & Rodriguez D.G. (2003), Coastal birds of the Northern Sierra Madre Natural Park. Ploeg J. van der, Bernardo E.C. & Masipiquena A.B. (Eds.), The Sierra Madre Mountain Range: Global Relevance, Local Realities. 4th Regional Conference on Environment and Development. Tuguegarao City: Golden Press. 63-74.
- Weerd M. van, Guerrero J.P., Tarun B.A. & Rodriguez D.G. (2003), Flying foxes of Northern Sierra Madre Natural Park. Ploeg J. van der, Bernardo E.C. & Masipiquena A.B. (Eds.), The Sierra Madre Mountain Range: Global Relevance, Local Realities. 4th Regional Conference on Environment and Development. Tuguegarao City: Golden Press. 54-62.
- Weerd M. van & General A.A.G. (2003), Conserving the Philippine crocodile in the Northern Sierra Madre: the results of three years research and conservation in action. Ploeg J. van der, Bernardo E.C. & Masipiquena A.B. (Eds.), The Sierra Madre Mountain Range: Global Relevance, Local Realities. 4th Regional Conference on Environment and Development. Tuguegarao City: Golden Press. 17-33.
- Weerd M. van & Van der Ploeg J. (2003), Community-based Research, Observance and Conservation (CROC): a research project aimed at contributing to the conservation of the Philippine crocodile (Crocodylus mindorensis) in Northeast Luzon, the Philippines. Cabagan: CVPED.
- Weerd M. van & Van der Ploeg J. (2003), Philippines, Crocodile Specialist Group Newsletter 22(1): 8-11.
- Weerd M. van (2003), Mens en Krokodil leven samen op de Filippijnen, Ecologie en Ontwikkeling 11(2/3): 15-17.
- Van der Ploeg J. & Weerd M. van (2003), Last stronghold of the Philippine Crocodile, Haring Ibon 1st quarte: 31-34.
- Weerd M. van (2002), The status and conservation of the Philippine crocodile Crocodylus mindorensis in the Northern Sierra Madre, Luzon, the Philippines. The Crocodile Specialist Group (Ed.), Crocodiles. Proceedings of the 16th working meeting of the Crocodile Specialist Group. 16th working meeting of the IUCN SSC/Crocodile Specialist Group in Gainesville, Florida, USA. Gland, Switzerland and Cambridge, UK: IUCN. 97-107.