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Maartje Klapwijk

Maartje Klapwijk
Maartje Klapwijk is senior lecturer in forest entomology. She has a keen interest in population dynamics of native and invasive species in relation to forest management.


I specialise in anthropogenic effects on species interactions, using insects as a study system. Current research questions in applied ecology are dealing with forest management, climate change and insect outbreaks. From the perspective of basic ecology, questions related to associational effects, indirect interactions and population dynamics are part of my research interest.


The central subject of my research is population regulation through trophic interactions (feeding interactions). One of my main research interests is how these interactions are affected by human induced changes to the living environment of the interacting species. In my work this is represented by research on climate effects on insects and the interactions with their natural enemies.

Management used for semi-natural forests determines for a large part the structural and biological diversity in forest stands. Increased diversity of vegetation will have a subsequent effect on the diversity of consumers and predators. My main interest is whether forest management affects the top-down pressure of predators on insect herbivores with positive effects of pest supression. Forest health is important when considering species invasions and emerging pests. 

In this research context I work with emerging pests within the European project HOMED, where I collaborate with Dragos Cocos and Martin Schroeder. Together with Andrew (Sandy) Liebhold I am developing a research project investigating biological invasions and host associations. In addition, I am interested in indirect interactions and associational effects work that is being developed by Michelle Nordkvist in collaboration with Christer Björkman


I am involved in the following projects:

Risk of bark beetle damage in relation to forest management practise - Skogssällskapet

Biogeographic analysis of historical forest insect invasions and host associations - SNS Nordic Forest Research

HOMED - HOlistic Management of Emerging forest pests and Diseases - EU Horizon 2020

The relationship between small mammal densities and sawfly cocoon predation – Faculty of Forest Sciences 

The dispersal of a gregarious forest pest insect and its specialist parasitoid - Carl Tryggers Stiftelsen för Vetenskaplig Forskning 

Combined effects of moose browsing and insect herbivory on tree growth - FORMAS  Reg. no 2015-55

Completed projects:

Ecological theory uniting agro-ecology and forestry research - SLU-internal funding 

Forest Management to mitigate risk of insect damage - FORMAS Reg. no 2013-535


It was during my MSc project that I became fascinated by host - parasitoid interactions and population dynamics. The first research project I was involved in looked at the dispersal of the cinnabar moth (Tyria jacobaeae) and its specialist parasitoid, Cotesia popularis in a fragmented population structure. My PhD continued on the theme investigating the effects of habitat fragmentation and climate change on host-parasitoid interactions using two study systems. The first is the endangered marsh fritillary butterfly (Euphydryas aurinia) and its specialist parasitoid, Cotesia bignellii. I used that system to study how much phenological synchrony between the host and parasitoid depend on weather and thus might be affected by climate change. The second system, the holly leafminer (Phytomyza ilicis) and its complex of parasitoids, I used to investigate effects of habitat fragmentation on co-existance of parasitoids on a shared host.


I am current supervising a number of PhD students. I am always interested in discussing short term projects for students. If you are interested in forest management in connection to insect population dynamics, and or trophic interactions, please do not hesistate to contact me to discuss ideas for projects.

Selected publications

Liebhold, A.M., Björkman, C., Roques, A, Bjornstad, O. & Klapwijk, M.J. (2020) Outbreaking forest insect drives phase synchrony among sympatric folivores:exploring potential mechanisms, early view Population Ecology,

Bellone, D., Björkman, C., Klapwijk, M.J. (2019) Top-down pressure by generalist and specialist natural enemies in relation to habitat heterogeneity and resource availability. pre-proof Basic and Applied Ecology

Nordkvist, M., Klapwijk, M. J., Edenius, L., Gershenzon, J., Schmidt, A., & Björkman, C. (2019). Trait‐mediated indirect interactions: Moose browsing increases sawfly fecundity through plant‐induced responses. Ecology and Evolution.

Klapwijk, M.J. (2019) The effect of multiple natural enemies on a shared herbivore prey. Ecology and Evolution.

Eriksson, L. and Klapwijk, M.J. (2019) Attitudes towards biodiversity conservation and carbon substitution in forestry: A study of stakeholders in Sweden, Forestry. 

Klapwijk, M.J., Boberg, J., Bergh, J., Bishop, K., Björkman, C., Ellison, D., Felton, A., Lidskog, R., Lundmark, T., Keskitalo, E. C. H., Sonesson, J., Nordin, A., Nordström, E. M., Stenlid, J. and Mårald, E. (2018) Capturing complexity: Forests, decision-making and climate change mitigation action, Global Environmental Change, 52, 238-247.

Klapwijk, M.J. and Bjorkman, C. (2018) Mixed forests to mitigate risk of insect outbreaks, Scandinavian Journal of Forest Research, 33, 772-780.

Klapwijk, M.J., Walter, J. A., Hirka, A., Csóka, G., Björkman, C. and Liebhold, A. M. (2018) Transient synchrony among populations of five foliage‐feeding Lepidoptera, Journal of Animal Ecology, 87, 1058-1068.

Bellone, B., Klapwijk, M.J. & Björkman, C. Habitat heterogeneity affects small mammal predation of pine sawfly cocoons, Ecology & Evolution, 7(24)

Birkhofer, K., Bylund, H., Dalin, P., Ferlian, O., Gagic, V., Hamback, P. A., Klapwijk, M.J., Mestre, L., Roubinet, E., Schroeder, M., Stenberg, J. A., Porcel, M., Bjorkman, C. and Jonsson, M. (2017) Methods to identify the prey of invertebrate predators in terrestrial field studies, Ecol Evol, 7, 1942-1953.

Eriksson, L., Björkman, C. & Klapwijk, M.J. (2018) General Public Acceptance of Forest Risk Management Strategies in Sweden: Comparing Three Approaches to Acceptability. Environment and Behavior, 50 (2) 159 - 186,

Klapwijk, M.J., Bylund, H., Schroeder, M. and Björkman C. (2016) Forest Management to increase natural biocontrol of insect pests, Forestry, 89 (3) 253 - 262

Klapwijk, M.J., Hopkins, A. M., Eriksson, L., Pettersson, M., Schroeder, M., Lindelöw, Å., Rönnberg, J., Keskitalo, E. C. and Kenis, M. (2016) Reducing the risk of invasive forest pests and pathogens: Combining legislation, targeted management and public awareness, Ambio, 45, 223-234.

Felton, A., Nilsson, U., Sonesson, J., Felton, A., Roberge, J.-M., Ranius, T., Ahlström, M., Bergh, J., Björkman, C., Boberg, J., Drössler, L., Fahlvik, N., Gong, P., Holmström, E., Keskitalo, E. C., Klapwijk, M.J., Laudon, H., Lundmark, T., Niklasson, M., Nordin, A., Pettersson, M., Stenlid, J., Sténs, A. and Wallertz, K. (2016) Replacing monocultures with mixed-species stands: Ecosystem service implications of two production forest alternatives in Sweden, Ambio, 45, 124-139.

Klapwijk, M.J., Csóka, G., Hirka, A. & Björkman, C., (2013) Forest insects and climate change: Long term trends in herbivore damage Ecology & Evolution, 3(16), 4183-4196

Senior Lecturer at the Department of Ecology; S, Forest entomology unit
Telephone: +4618672402
Postal address:
Inst för Ekologi, Box 7044
750 07 UPPSALA
Visiting address: Ulls Väg 16, Uppsala