dhr. dr. A.R.M. (Arne) Janssen

  • Faculteit der Natuurwetenschappen, Wiskunde en Informatica
  • Bezoekadres:
    Science Park A
    Science Park 904  Amsterdam
    Kamernummer: C3.219
  • Postadres:
    Postbus  94240
    1090 GE  Amsterdam
  • A.R.M.Janssen@uva.nl
    T:  0205257751

The research of my co-workers and me can be divided into two themes:


1. Interactions in food webs of plant-inhabiting arthropods
Organisms form part of more-or-less complex food webs, characterised by a multitude of direct and indirect interactions within and among species. We focus on the interactions between plants, herbivores, omnivores and natural enemies of herbivores. In particular, we study predator-prey interactions, plant-predator interactions, herbivore-pathogen interactions, antipredator behaviour, avoidance of adverse interactions, intraguild predation, apparent competition as well as role reversals in predator-prey systems, with an emphasis on behaviour of arthropods and the role of experience (learning). We focus on experimental systems with a clear applied component, predominantly consisting of herbivorous plant pests and predacious terrestrial arthropods, plants, and their microbial pathogens.


2. Experimental analysis of spatial interactions of predator and prey populations
Predators aggregate on patches where prey densities are high and predator densities low, whereas prey avoid aggregations of predators. We study the consequences of such density dependent behavioural responses both by behavioural observations on various predator-prey systems as well as by long-term experiments on metapopulations of predatory mites and phytophagous mites.


The study systems.

We use various study systems, in The Netherlands as well as in Brazil, where I spend part of my time at the Federal University of Viçosa, Department of Entomology.


  • The food web of arthropods that occur in crops, such as greenhouse cucumber, sweet pepper, roses in The Netherlands and other European countries. These crops are attacked by various arthropod pests such as the two-spotted spider mite (Tetranychus urticae), the Western flower thrips (Frankliniella occidentalis), the greenhouse whitefly (Trialeurodes vaporariorum) and the tobacco whitefly (Bemisia tabaci). Several natural enemies are released against these pests, for spider mites, this is the predatory mite Phytoseiulus persimilis. For Western flower thrips, the predatory mites Iphiseius degenerans and Amblyseius cucumeris and the predadory bug Orius laevigatus are used. The PhD-project by Maria Nomikou in our research groups has resulted in a new natural enemy against whiteflies, the predatory mite Typhlodromus swirskii (see www.allaboutswirskii.com).


  • The food web occurring on tomato plants. The native Brazilian spider mite Tetranychus evansi was found to downregulate the defences of tomato plants (see below). We focus on the consequences of such reduced plant defences on other herbivores and natural enemies associated with tomato plants in the field in Brazil and in greenhouses in Europe.


  • The food web of arthropods that occur on a native (guava) and a novel (eucalyptus) host plant in Brazil. The emphasis is on adaptation of herbivores and natural enemies coming from a native host plant to a novel host plant, with special emphasis on defoliating caterpillars such as the geometrid Thyrinteina arnobia and its natural enemies.


  • The food web on coffee plants in Brazil. Many plants, including coffee, have small hollow structures at the undersides of their leaves and these structures are often inhabited by mites. These structures are therefore called acarodomatia (mite houses). The domatia of coffee plants in Brazil are inhabited the predatory mite species Iphiseius zuluagai and Amblyseius herbicolus. We are interested in how these domatia affect the interactions between coffee plants, their herbivores and the natural enemies.


  • Communities of arthropod predators in Brazil. We study the time scale and spatial scale at which various species of predators can learn the association of food with odours, both in the field and in the laboratory.


A spider mite that manipulates plant defence

When herbivores such as spider mites attack a plant, complex plant defence mechanisms are activated.In collaboration with colleagues from the Federal Universities of Viçosa and Tocantins, Brazil, we recently discovered that certain spider mites are able to disrupt these mechanisms, effectively disarming the plant.

Phytopathogens and herbivores induce plant defences. There is evidence that some pathogens suppress these defences by interfering with signaling pathways involved in the defence, but such evidence is scarce for herbivores. We found that the invasive spider mite Tetranychus evansi suppresses the induction of signaling routes involved in induced plant defences in tomato. As a result, the mites performed much better on previously attacked plants than on non-attacked plants. These findings provide a new perspective on plant-herbivore interactions, plant protection and plant resistance to invasive species.
Another mite species, the closely related T. urticae can also profit from the suppression of induction of defence by T. evansi . However, the latter protects leaf area with down-regulated plant defence by covering it with a dense web that is difficult to penetrate by T. urticae .



Adults, eggs and web of Tetranychus evansi on a tomato leaf. (photo: Jan van Arkel, IBED)





Parasitoid turns its host into a bodyguard

Parasites can induce dramatic changes of behaviour in their host species. This behaviour is thought to be detrimental to the host, but beneficial to the parasite. In a joint publication, researchers from the University of Amsterdam and University of Viçosa ( Brazil ) show evidence of spectacular behavioural changes induced by a parasitic wasp in the caterpillar of a moth species.

After the wasp ( Glyptapanteles sp.) has oviposited eggs in the body of a caterpillar ( Thyrinteina leucocerae ), these develop into larvae that live on the body fluids of the caterpillar. After the wasp larvae crawl out of the caterpillar to pupate, the caterpillar acts as a bodyguard to defend them from predator attacks. This results in a twofold reduction of predation of the wasp pupae in the field.

After several days, the adult wasps emerge from their pupae and the caterpillar dies.


A caterpillar standing guard near pupae of its parasitoids. (photo Jose Lino Neto, Federal University of Viçosa, Brazil)

See also

Publications Arne Janssen (July, 2015)



Choh, Y., Sabelis, M.W., Janssen, A., 2015. Distribution and oviposition site selection by predatory mites in the presence of intraguild predators. Exper. Appl. Acarol. 67: 477-491. DOI 10.1007/s10493-015-9970-8

Godinho, D.P., Janssen, A., Dias, T., Cruz, C., Magalhães, S., 2015. Down-regulation of plant defence in a resident spider mite species and its effect upon con-and heterospecifics. Oecologia 1–7. doi: 10.1007/s00442-015-3434-z

de Oliveira, E.F., Pallini, A., Janssen, A. 2015. Herbivores with similar feeding modes interact through the induction of different plant responses. Oecologia 1-10. doi: 10.1007/s00442-015-3344-0

Duarte, M.V.A., Venzon, M., de S. Bittencourt, M.C., Rodríguez-Cruz, F.A., Pallini, A., Janssen, A. 2015. Alternative food promotes broad mite control on chilli pepper plants. BioControl 1-9. doi: 10.1007/s10526-015-9688-x

Lemos, F., Bernardo, A., Dias, C., Sarmento, R.A., Pallini, A., Venzon, M., Janssen, A. 2015. Breaking and entering: predators invade the shelter of their prey and gain protection. Exper. Appl. Acarol. 67: 247–257. doi: 10.1007/s10493-015-9951-y

Kant, M.R., Jonckheere, W., Knegt, B., Lemos, F., Liu, J., Schimmel, B.C.J., Villarroel, C.A., Ataide, L.M.S., Dermauw, W., Glas, J.J., Egas, M., Janssen, A., Van Leeuwen, T., Schuurink, R.C., Sabelis, M.W., Alba, J.M. 2015. Mechanisms and ecological consequences of plant defence induction and suppression in herbivore communities. Annals of Botany 115:1015–1051.

Janssen, A., Sabelis, M. 2015. Alternative food and biological control by generalist predatory mites: the case of Amblyseius swirski. Exper. Appl. Acarol. 65: 413–418.

Marques, R.V., Sarmento R.A., Lemos F., Pedro-Neto, M., Sabelis, M.W., Venzon, M., Pallini, A., Janssen. A. 2015. Active prey mixing as an explanation for polyphagy in predatory arthropods: synergistic dietary effects on egg production despite a behavioural cost. Funct. Ecol. 29: 1317–1324. doi: 10.1111/1365-2435.12439

van Maanen, R., Broufas, G., de Jong, P., Aguilar-Fenollosa, E., Revynthi, A., Sabelis, M.W., Janssen, A. 2015. Predators marked with chemical cues from one prey have increased attack success on another prey species. Ecol. Entomol. 40: 62–68.



Muñoz- Cárdenas, K., Fuentes, L.S., Cantor, R.F., Rodríguez, C.D., Janssen, A., Sabelis, M.W. 2014. Generalist red velvet mite predator ( Balaustium sp.) performs better on a mixed diet. Exper. Appl. Acarol. 62: 19-32.

Rezende, M.Q., Venzon, M., Perez, A.L., Cardoso, I.M., Janssen, A. 2014. Extrafloral nectaries of associated trees can enhance natural pest control. Agric. Ecosyst. Environ. 188: 198-203.

Choh, Y., Takabayashi, J., Sabelis, M.W., Janssen, A. 2014. Witnessing predation can affect strength of counterattack in phytoseiids with ontogenetic predator–prey role reversal. Anim. Behav. 93: 9-13.

Messelink, G.J., Janssen, A. 2014. Increased control of thrips and aphids in greenhouses with two species of generalist predatory bugs involved in intraguild predation. Biol. Contr. 79: 1–7.

Janssen, A., Fonseca, J.O., Colares, F., Silva, L., Pedrosa, A.R.P., Lima, E.R., van Wijk, M., Pallini, A., Oliveira, C.M., Sabelis, M.W., Lesna, I. 2014. Time scales of associating food and odor by predator communities in the field. Behav. Ecol. 25: 1123-1130.



de Almeida, A.A., Janssen, A., 2013. Juvenile prey induce antipredator behaviour in adult predators. Exper. Appl. Acarol. 59: 275–282.

Messelink, G.J., Bloemhard, C.M.J., Sabelis, M.W., Janssen, A. 2013. Biological control of aphids in the presence of thrips and their enemies. BioContr. 58: 45-55.



Sabelis, M.W., Janssen, A., Lesna, I. 2012. Consequences of trait-mediated indirect interactions for biological control of plant pests. In T. Ohgushi, O.J. Schmitz, R.D. Holt (Eds): Interaction Richness and Complexity: Ecological and Evolutionary Aspects of Trait-Mediated Indirect Interactions. Cambridge University Press, Cambridge, UK.

Montserrat, M., Magalhães, S., Sabelis, M.W., de Roos, A.M., Janssen, A. 2012. Invasion success in communities with reciprocal intraguild predation depends on the stage structure of the resident population. Oikos 121: 67–76. doi: 10.1111/j.1600-0706.2011.19369.x

Messelink, G.J., Sabelis, M.W., Janssen, A. 2012. Generalist predators, food web complexities and biological pest control in greenhouse crops. In M.L. Larramendy, S. Soloneski (Eds) Integrated Pest Management and Pest Control - Current and Future Tactics. InTech, Rijeka, Croatia. pp. 191-214.  ISBN: 978-953-51-0050-8.

van der Hammen, T., Montserrat, M., Sabelis, M.W., de Roos, A.M., Janssen, A. 2012. Whether ideal free or not, predatory mites distribute so as to maximize reproduction. Oecologia 169: 95-104.

van Maanen, R., Broufas, G., Oveja, M.F., Sabelis, M.W., Janssen, A., 2012. Intraguild predation among plant pests: western flower thrips feed on whitefly crawlers. BioControl 57: 533–539.

Meng, R.-X., Sabelis, M.W., Janssen, A., 2012. Limited predator-induced dispersal in whiteflies. PLoS ONE 7(9): e45487.

Choh, Y., Ignacio, M., Sabelis, M.W. & Janssen, A., 2012. Predator-prey role reversals, juvenile experience and adult antipredator behaviour. Sci. Rep. 2, 728.

van Maanen, R., Messelink, G.J., van Holstein-Saj, R., Sabelis, M.W., Janssen, A. 2012. Prey temporarily escape from predation in the presence of a second prey species. Ecol. Entomol. 37: 529-535.



Sabelis, M.W., Janssen, A., Takabayashi, J., 2011. Can plants evolve stable alliances with the enemies’ enemies? J. Plant Interact. 6: 71-75.

Sarmento, R.A., Lemos, F., Bleeker, P.M., Schuurink, R.C., Pallini, A., Oliveira, M.G.A., Lima, E.R., Kant, M., Sabelis, M.W., Janssen, A., 2011. A herbivore that manipulates plant defence. Ecol. Lett. 14: 229–236.

Messelink, G.J., Bloemhard, C.M.J., Cortes, J.A., Sabelis, M.W., Janssen, A., 2011. Hyperpredation by generalist predatory mites disrupts biological control of aphids by the aphidophagous gall midge Aphidoletes aphidimyza. Biol. Contr. 57: 246–252.

Ferreira, J.A.M., Cunha Dalyson, F.S., Pallini, A., Sabelis, M.W., Janssen, A. 2011. Leaf domatia reduce intraguild predation among predatory mites. Ecol. Entomol. 36: 435-441.

Sarmento, R.A., Lemos, F., Dias, C.R., Kikuchi, W.T., Rodrigues, J.C.P., Pallini, A., Sabelis, M.W., Janssen, A. 2011. A herbivorous mite down-regulates plant defence and produces web to exclude competitors. PLoS ONE 6(8) e23757.



Ferreira, J., Pallini, A., Oliveira, C.L., Sabelis, M.W., Janssen, A., 2010. Leaf domatia do not affect population dynamics of the predatory mite Iphiseiodes zuluagai. Basic Appl. Ecol. 11: 144-152.

Belliure, B., Janssen, A., Sabelis, M.W., 2010. Vector and virus induce plant responses that benefit a non-vector herbivore. Basic Appl. Ecol. 11: 162-169.

Janssen, A., Grosman, A.H., Cordeiro, E.G., de Brito, E.F., Oliveira Fonseca, J., Colares, F., Pallini, A., Lima, E.R., Sabelis, M.W., 2010. Context-dependent fitness effects of behavioral manipulation by a parasitoid. Behav. Ecol. 21: 33-36.

Nomikou, M., Sabelis, M.W., Janssen, A, 2010. Pollen subsidies promote whitefly control through the numerical response of predatory mites. Biocontrol 55: 253 - 260.

van der Hammen, T., de Roos, A.M., Sabelis, M.W., Janssen, A., 2010. Order of invasion affects the spatial distribution of reciprocal intraguild predators. Oecologia 163: 79-89.

Choh, Y., van der Hammen, T., Sabelis, M.W., Janssen, A., 2010. Cues of intraguild predators affect the distribution of intraguild prey. Oecologia 163: 335–340.

Messelink, G., van Maanen, R., van Holstein-Saj, R., Sabelis, M.W., Janssen, A., 2010. Pest species diversity enhances control of spider mites and whiteflies by a generalist phytoseiid predator. Biocontrol 55: 387 - 398.

Lemos, F., Sarmento, R.A., Pallini, A., Dias, C.R., Sabelis, M.W., Janssen, A., 2010. Spider mite web mediates anti-predator behaviour. Exp. Appl. Acarol. 52: 1-10.

van Maanen, R., Vila, E., Sabelis, M.W., Janssen, A., 2010. Biological control of broad mites ( Polyphagotarsonemus latus) with the generalist predator Amblyseius swirskii. Exp. Appl. Acarol. 52: 29-34.



Cakmak, I., Janssen, A., Sabelis, M.W., Baspinar H., 2009. Biological control of an acarine pest by single and multiple natural enemies. Biol. Contr. 50: 60-65.

Sabelis, M.W., Hanna, R., Onzo, A., Pallini,  A., Cakmak, I., Janssen, A., 2009. Multiple predators, intraguild interactions and biological control of a single spider mite species. IOBC Bull. 50: 83-94.



Roth, S., Janssen, A., Sabelis, M.W., 2008. Odour-mediated sexual attraction in nabids (Heteroptera: Nabidae). Eur. J. Entomol. 105: 159-162.

Messelink, G., van Maanen, R., van Steenpaal, S., Janssen, A., 2008. Biological control of thrips and whiteflies by a shared predator: Two pests are better than one. Biol. Contr. 44: 372-379.

Messelink, G., Ramakers, P.M.J., Cortez, J.A., Janssen, A., 2008. How to enhance pest control by generalist predatory mites in greenhouse crops. In P.G. Mason, D.R. Gillespie, C. Vincent (Eds.): Proc. 3rd Int. Symp. Biol. Contr. Arthrop. Christchurch, New Zealand, 8-13 February 2009. pp. 309-318.

Montserrat, M.,  Magalhães, S., Sabelis, M.W., de Roos, A.M., Janssen, A., 2008. Patterns of exclusion in an intraguild predator-prey system depend on initial conditions. J. Anim. Ecol. 77: 624-630.

Ferreira, J.A.M, Eshuis, B., Janssen, A., Sabelis, M.W., 2008. Domatia reduce larval cannibalism in predatory mites. Ecol. Entomol. 33: 374-379.

Grosman, A.H., Janssen, A., de Brito, E.F., Cordeiro, E.G., Colares, F., Oliveira Fonseca, J., Lima, E.R., Pallini, A., Sabelis, M.W., 2008. Parasitoid increases survival of its pupae by inducing hosts to fight predators. PLoS ONE 3 (6): e2276. http://www.plosone.org/doi/pone.0002276.

Belliure, B., Janssen, A., Sabelis, M.W., 2008. Herbivore benefits from vectoring plant virus through reduction of period of vulnerability to predation. Oecologia 156: 797–806. doi: 10.1007/s00442-008-1027-9

Sabelis, M.W., Janssen, A. Lesna, I. Aratchige, N.S. Nomikou M. & van Rijn, P.C.J. 2008. Developments in the use of predatory mites for biological pest control. IOBC/WPRS Bull. 12: 187-199.

van Maanen, R. and A. Janssen, 2008. Prey preference of the generalist predator Amblyseius swirskii. IOBC/WPRS Bull. 32: 241-244.



Montserrat, M., Bas, C., Magalhães, S., Sabelis, M.W., de Roos, A.M., Janssen, A., 2007. Predators induce egg retention in prey. Oecologia 150: 699-705. doi: 10.1007/s00442-006-0527-8

Belliure, B., Janssen, A., Sabelis, M.W., 2007. Thrips and Tospoviruses benefit from jointly challenging plants. J. Insect Sci. 7.

Oliveira, H., Janssen, A., Pallini, A., Venzon, M., Fadini, M., Duarte, V., 2007. A phytoseiid predator from the tropics as potential biological control agent for the spider mites Tetranychus urticae Koch (Acari: Tetranychidae). Biol. Contr. 42: 105-109. doi: 10.1016/j.biocontrol.2007.04.011

Sarmento, R.A., Venzon, M., Pallini, A., Oliveira, E.E., Janssen, A., 2007. Use of odours by Cycloneda sanguinea to assess patch quality. Entomol. Exp. Appl. 124: 313-318. doi: 10.1111/j.1570-7458.2007.00587.x

Magalhães, S., Fayard, J., Janssen, A., Carbonell, D., Olivieri, I., 2007. Adaptation in a spider mite population after long-term evolution on a single host plant. J. Evol. Biol. 20: 2016-2027. doi: 10.1111/j.1420-9101.2007.01365.x

Janssen, A., Sabelis, M.W., Magalhães, S., Montserrat, M., & van der Hammen, T., 2007. Habitat structure affects intraguild predation. Ecology 88: 2713-2719. doi: 10.1890/06-1408.1

Sabelis, M.W., Takabayashi, J., Janssen, A., Kant, M., Wijk, M. van, Sznajder, B.A., Aratchige, N.S., Lesna, I.K.A., Belliure, B. & Schuurink, R.C., 2007. Ecology meets plant physiology: herbivore-induced plant responses and their indirect effects on arthropod communities. In T. Ohgushi, T.P. Craig & P.W. Price (Eds.): Ecological Communities: Plant Mediation in Indirect Interaction Webs. Cambridge: Cambridge University Press. pp. 188-217.



Takabayashi, J., Sabelis, M.W., Janssen, A., Shiojiri, K., van Wijk, M., 2006. Can plants betray the presence of multiple herbivore species to predators and parasitoids? The role of learning in phytochemical networks. Ecol. Res. 21: 3-8. doi: 10.1007/s11284-005-0129-7

Çakmak, I., Janssen, A., Sabelis, M.W., 2006. Intraguild interactions between the predatory mites Neoseiulus californicus and Phytoseiulus persimilis. Exp. Appl. Acarol. 28: 33-46. doi: 10.1007/s10493-005-6247-7

Meng, R., Janssen, A., Nomikou, M., Zhang, Q.W., Sabelis, M.W. 2006. Previous and present diets of mite predators affect antipredator behaviour of whitefly prey. Exp. Appl. Acarol. 38: 113-124. doi: 10.1007/s10493-006-0010-6

Matos, C.H.C, Pallini, A., Chaves, F.F., Schoereder, J.H., Janssen, A., 2006. Do domatia mediate mutualistic interactions between coffee plants and predatory mites? Entomol. Exp. Appl. 118: 185-192. doi: 10.1111/j.1570-7458.2006.00381.x

de Bruijn, P.J.A., Egas, M., Janssen, A., Sabelis, M.W., 2006. Pheromone-induced priming of a defensive response in Western flower thrips. J. Chem. Ecol. 32: 1599-1603. doi: 10.1007/s10886-006-9092-1

Montserrat, M., Janssen, A., Magalhães, S., Sabelis, M.W., 2006. To be an intraguild predator or a cannibal: Is prey quality decisive? Ecol. Entomol. 31: 430-436. doi: 10.1111/j.1365-2311.2006.00804.x

Janssen, A., Montserrat, M., HilleRisLambers, R., de Roos, A.M., Pallini, A., Sabelis, M.W., 2006. Intraguild predation usually does not disrupt biological control. In Trophic and guild interactions in biological control (eds J. Brodeur & G. Boivin), Vol. 3, pp. 21 - 44. Springer, Dordrecht, The Netherlands.



Sabelis, M.W., Janssen, A., Diekmann, O., Jansen, V.A.A., van Gool, E., van Baalen, M., 2005. Global persistence despite local extinction in acarine predator-prey systems: Lessons from experimental and mathematical exercises. Adv. Ecol. Res. 17:  Population Dynamics and Laboratory Ecology, pp. 183-220.

Belliure, B, Janssen, A., Maris, P.C., Peters, D., Sabelis, M.W., 2005. Herbivore arthropods benefit from vectoring plant-viruses. Ecol. Lett. 8: 70-79. doi: 10.1111/j.1461-0248.2004.00699.x

Magalhães, S., Tudorache, C., Montserrat, M., van Maanen, R., Sabelis, M.W., Janssen, A., 2005. Diet of intraguild predators affects antipredator behaviour in intraguild prey. Behav. Ecol. 16: 364-370. doi: 10.1093/beheco/arh171

van Munster, M., Janssen, A., Clérivet, A., van den Heuvel, J., 2005. Can plants use an entomopathogenic virus as defense against herbivores? Oecologia 143: 396-401. doi: 10.1007/s00442-004-1818-6

Hountondji, F.C.C., Sabelis, M.W., Hanna, R., Janssen, A., 2005. Herbivore-induced plant volatiles trigger sporulation in entomopathogenic fungi: the case of Neozygites tanajoae infecting the cassava green mite. J. Chem. Ecol. 31: 1003-1021. doi: 10.1007/s10886-005-4244-2

Grosman, A, van Breemen, M., Holtz, A., Pallini, A., Molina Rugama, A., Pengel, H., Venzon, M., Sabelis, M.W., Janssen, A. 2005. Searching behaviour of an omnivorous predator for novel and native host plants of its herbivores: a study on arthropod colonization of eucalyptus in Brazil. Entomol. Exp. Appl. 116: 135-142. doi: 10.1111/j.1570-7458.2005.00307.x

Groot, T.V.M., Janssen, A., Pallini, A., Breeuwer, J.A.J. 2005. Adaptation in the asexual false spider mite Brevipalpus phoenicis: evidence for frozen niche variation. Exp. Appl. Acarol. 36: 165-176. doi: 10.1007/s10493-005-3360-6

Magalhães, S., Janssen, A., Montserrat, M., Sabelis, M.W. 2005. Prey attack and predators defend: counterattacking prey trigger parental care in predators. P. Roy. Soc. B. 272: 1929-1933. doi: 10.1098/rspb.2005.3127

Magalhães, S., Janssen, A., Montserrat, M., Sabelis, M.W., 2005. Host plant species modifies the diet of an omnivore feeding on three trophic levels. Oikos 111: 47-56. doi: 10.1111/j.0030-1299.2005.13897.x

Nomikou, M., Meng, R., Schraag, R., Sabelis, M.W., Janssen, A. 2005. How predatory mites find plants with whitefly prey. Exp. Appl. Acarol. 36: 263-275. doi: 10.1007/s10493-005-6650-0

Sabelis, M.W., van Rijn, P.C.J., Janssen, A., 2005. Fitness consequences of food-for-protection strategies in plants. In Wäckers, F.L., van Rijn, P.C.J., Bruin, J. (eds): Plant-provided food for carnivorous insects: A protective mutualism and its applications. Cambridge University Press, Cambridge, UK. pp. 109-134.



Nomikou, M., Janssen, A., Schraag, R., Sabelis, M.W., 2004. Vulnerability of Bemisia tabaci immatures to phytoseiid predators: Consequences for oviposition and influence of alternative food. Entomol. Exp. Appl. 110: 95-102. doi: 10.1111/j.0013-8703.2004.00114.x

Onzo, A., Hanna, R., Janssen, A., Sabelis, M.W., 2004. Interactions between two Neotropical phytoseiid predators on cassava plants and consequences for biological control of a shared spider mite prey: a screenhouse evaluation. Biocontr. Sci. Techn. 14: 63-76. doi: 10.1080/09583150310001638548

Janssen, A., Sabelis, M.W., 2004. Food web interactions and ecosystem processes. In Weisser, W.W., Siemann, E. (eds.): Insects and Ecosystem Function. Ecological Studies 173. Springer, Heidelberg. pp. 175-191.



Nomikou, M., Janssen, A., Sabelis, M.W., 2003. Phytoseiid predators of whiteflies feed and reproduce on non-prey food sources. Exp. Appl. Acarol. 31: 15-26. doi: 10.1023/B:APPA.0000005142.31959.e8

Nomikou, M., Janssen, A., Sabelis, M.W., 2003. Phytoseiid predator of whitefly feeds on plant tissue. Exp. Appl. Acarol. 31: 27-36. doi: 10.1023/B:APPA.0000005150.33813.04

Janssen, A., Willemse, E., van der Hammen, T., 2003. Poor host plant quality causes omnivore to consume eggs of its predator. J. Anim. Ecol. 72: 478-483. doi: 10.1046/j.1365-2656.2003.00717.x

Nomikou, M., Janssen, A., Sabelis, M.W., 2003. Herbivore host plant selection: whitefly learns to avoid host plants that harbour predators of her offspring. Oecologia 136: 484-488. doi: 10.1007/s00442-003-1289-1

Hochberg, M.E., Bertault, G., Poitrineau, K., Janssen, A., 2003. Olfactory orientation of the truffle beetle, Leiodes cinnamomea. Entomol. Exp. Appl. 109: 146-153.



Nomikou, M., Janssen, A., Schraag, R., Sabelis, M.W., 2002. Phytoseiid predators suppress populations of Bemisia tabaci on cucumber plants with alternative food. Exp. Appl. Acarol. 27: 57-68. doi: 10.1023/A:1021559421344

Faraji, F., Janssen, A., Sabelis, M.W., 2002. The benefits of clustering eggs: the role of egg predation and larval cannibalism in a predatory mite. Oecologia 131: 20-26. doi: 10.1007/s00442-001-0846-8

Venzon, M., Janssen, A., Sabelis, M.W.2 2002. Prey preference and reproductive success of the generalist predator Orius laevigatus. Oikos 97: 116-124. doi: 10.1034/j.1600-0706.2002.970112.x

Janssen, A., Sabelis, M.W., Bruin, J., 2002. Evolution of herbivore-induced plant volatiles. Oikos 97: 134-138. doi: 10.1034/j.1600-0706.2002.970114.x

Agrawal, A.A., Janssen, A., Bruin. J., Posthumus, M.A., Sabelis, M.W., 2002. An ecological cost of plant defence: attractiveness of bitter cucumber plants to natural enemies of herbivores. Ecol. Lett. 5: 377-385. doi: 10.1046/j.1461-0248.2002.00325.x

Magalhães, S., Janssen, A., Hanna, R., Sabelis, M.W., 2002. Flexible antipredator behaviour in herbivorous mites through vertical migration in a plant. Oecologia 132: 143-149.doi: 10.1007/s00442-002-0950-4

Janssen, A., Faraji, F., van der Hammen, T., Magalhães, S., Sabelis, M.W., 2002. Interspecific infanticide deters predators. Ecol. Lett. 5: 490-494. doi 10.1046/j.1461-0248.2002.00349.x

Faraji, F., Janssen, A., Sabelis, M.W., 2002. Oviposition patterns in a predatory mite: Avoiding the risk of egg predation caused by prey. Ecol. Entomol. 27: 660-664. doi: 10.1046/j.1365-2311.2002.00456.x

Sabelis, M.W., van Baalen, M., Pels, B. Egas, M., Janssen, A., 2002. Evolution of exploitation and defense in tritrophic interactions. In Dieckmann, U., Metz, J.A. Sabelis, M.W., Sigmund, K. (eds): Adaptive dynamics of infectious diseases: In pursuit of virulence management. Cambridge, Cambridge University Press. pp. 297-321.



Nomikou, M., Janssen, A., Schraag, R., Sabelis, M.W., 2001. Phytoseiid predators as potential biological control agents for Bemisia tabaci. Exp. Appl. Acarol. 25: 271-291.doi: 10.1023/A:1017976725685

Faraji, F., Janssen, A., Sabelis, M.W., 2001. Predatory mites avoid ovipositing near counter-attacking prey. Exp. Appl. Acarol. 25: 613-623. doi: 10.1023/A:1016100212909

Venzon, M., Janssen, A., Sabelis, M.W., 2001. Prey preference, intraguild predation and population dynamics of an arthropod food web on plants. Exp. Appl. Acarol. 25: 785-808. doi: 10.1023/A:1020443401985

Pallini, A., Venzon, M.,  Janssen, A. 2001. Infoquímicos mediando interações de ácaros em teias alimentares. In Vilela, E.F., Della Lucia, T.M.C. (Eds): Feromônios de Insetos - Biologia, química e aplicação. 2 a edição. pp. 113-120.

Venzon, M., Pallini, A. Janssen, A. 2001. Interactions mediated by predators in arthropod food webs. Neotrop. Entomol. 30 (1): 1-9.

Sabelis, M.W., Janssen, A., Kant, M.K., 2001. The enemy of my enemy is my ally. Science 291: 2104-2105. doi: 10.1126/science.1059939

Ellner, S.P., McCauley, E., Kendall, B.E., Briggs, C.J., Hosseini, P., Wood, S.N., Janssen, A., Sabelis, M.W., Turchin, P., Nisbet, R.M., Murdoch, W.W., 2001. Habitat structure and population persistence in an experimental community. Nature 412: 538-543.



Faraji, F., Janssen, A., van Rijn, P.C.J., Sabelis, M.W., 2000. Kin recognition by the predatory mite Iphiseius degenerans: discrimination among own, conspecific, and heterospecific eggs. Ecol. Entomol. 25: 147-155. doi: 10.1046/j.1365-2311.2000.00240.x

Elliot, S.L., Sabelis, M.W., Janssen, A., van der Geest L.P.S., Beerling, E.A.M., Fransen, J., 2000. Can plants use entomopathogens as bodyguards? Ecol. Lett. 3: 228-235. doi: 10.1046/j.1461-0248.2000.00137.x

Venzon, M., Janssen, A., Pallini, A., Sabelis, M.W., 2000. Diet of a polyphagous predator affects refuge-seeking of its prey. Anim. Behav. 60: 369-375. doi: 10.1006/anbe.2000.1483

McCauley, E., Kendall, B.E., Janssen, A., Wood, S., Murdoch, W.W., Hosseini, P., Briggs, C.J., Ellner, S.P., Nisbet, R.M., Sabelis, M.W., Turchin, P. 2000. Inferring colonization processes from population dynamics in spatially-structured predator-prey systems. Ecology 81: 3350–3361.



Sabelis, M.W., van Baalen,  M., Bruin, J., Egas, M., Jansen, V.A.A., Janssen, A., Pels, B., 1999. The evolution of overexploitation and mutualism in plant-herbivore-predator interactions and its impact on population dynamics. In B.A. Hawkins & H.V. Cornell (Eds.): Theoretical Approaches to Biological Control. Cambridge University Press, pp. 259-282.

Janssen, A., 1999. Plants with spider-mite prey attract more predatory mites than clean plants under greenhouse conditions. Entomol. Exp. Appl. 90: 191-198. doi: 10.1023/A:1003551931509

Sabelis, M.W., Janssen, A., Bruin, J., Bakker, F.M., Drukker, B., Scutareanu, P., van Rijn, P.C.J., 1999. Interactions between arthropod predators and plants: A conspiracy against herbivorous arthropods? In J. Bruin, L.P.S. van der Geest & M.W. Sabelis (Eds): Ecology and Evolution of the Acari. Kluwer Acad. Publ., Dordrecht, The Netherlands. pp. 207-229.

Pallini, A., Janssen, A., Sabelis, M.W., 1999. Do western flower thrips avoid plants infested with spider mites? Interactions between potential competitors. In J. Bruin, L.P.S. van der Geest & M.W. Sabelis (Eds): Ecology and Evolution of the Acari. Kluwer Acad. Publ., Dordrecht, The Netherlands. pp. 375-380.

Janssen, A., Pallini, A., Venzon, M., Sabelis, M.W. 1999. Absence of odour-mediated avoidance of heterospecific competitors by the predatory mite Phytoseiulus persimilis. Entomol. Exp. Appl. 92: 73-82. doi: 10.1023/A:1003708512701

Sabelis, M.W., Janssen, A., Pallini, A., Venzon, M., Bruin, J., Drukker, B., Scutareanu, P., 1999. Behavioural responses of predatory and herbivorous arthropods to induced plant volatiles: From evolutionary ecology to agricultural applications. In A. Agrawal, S. Tuzun, E. Bent (Eds): Induced plant defenses against pathogens and herbivores. American Phytopathological Society, St. Paul, Minnesota, USA. pp. 269-296.

Pallini, A., Janssen, A., Sabelis, M.W., 1999. Spider mites avoid plants with predators. Exp. Appl. Acarol. 23: 803-815. doi: 10.1023/A:1006266232714

Venzon, M., Janssen, A., Sabelis, M.W., 1999. Attraction of a generalist predator towards herbivore-infested plants. Entomol. Exp. Appl. 93: 305-314



Janssen, A., Pallini, A., Venzon, M., Sabelis, M.W., 1998. Behaviour and indirect food web interactions among plant inhabiting arthropods. A review. Exp. Appl. Acarol. 22: 497-521. doi: 10.1023/A:1006089924336

Pallini, A., Janssen, A., Sabelis, M.W. 1998. Predators induce interspecific herbivore competition for food in refuge space. Ecol. Lett. 1: 171-177. doi: 10.1046/j.1461-0248.1998.00019.x

Sabelis, M.W., van Baalen, M., Bakker, F.M., Bruin, J., Drukker, B., Egas, M., Janssen, A., Lesna, I., Pels, B., van Rijn, P.C.J., Scutareanu, P., 1998. Evolution of direct and indirect plant defence against herbivorous arthropods. In H. Olff, R.H. Drent & V.K. Brown, (Eds): Herbivores: Between Plants and Predators. Blackwell Science, London, pp. 109-166.



Janssen, A. Bruin, J., Jacobs, G., Schraag, R.,1997. Odour-mediated avoidance of conspecifics in predatory mites: Conflict of interest between plants and natural enemies? Proc. Acarology IX, Internat. Congr. of Acarol. 17-22 July 1994. pp. 249-253.

Janssen, A. Bruin, J., Jacobs, G., Schraag, R., Sabelis, M.W., 1997. Predators use volatiles to avoid prey patches with conspecifics. J. Anim. Ecol. 66: 223-232.

Pallini, A., Janssen, A., Sabelis, M.W., 1997. Odour-mediated responses of phytophagous mites to conspecific and heterospecific competitors. Oecologia 110: 179-185. doi: 10.1007/s004420050147

Janssen, A., van Gool, E., Lingeman, R., Jacas, J., van de Klashorst, G., 1997. Metapopulation dynamics of a persisting predator-prey system in the laboratory: Time series analysis. Exp. Appl. Acarol. 21: 415-430. doi: 10.1023/A:1018479828913

Drukker, B., Janssen, A., Ravensberg, W., Sabelis, M.W., 1997. Improved control capacity of the mite predator Phytoseiulus persimilis (Acari: Phytoseiidae) on tomato. Exp. Appl. Acarol. 21: 507-518.



Janssen, A., van Alphen, J.J.M., Sabelis, M.W., Bakker, K., 1995. Specificity of odour-mediated avoidance of competition in Drosophila parasitoids. Behav. Ecol. Sociobiol. 36: 229-235. doi: 10.1007/BF00165831

Janssen, A., van Alphen, J.J.M., Sabelis, M.W., Bakker, K., 1995. Odour-mediated avoidance of competition in Drosophila parasitoids: The ghost of competition. Oikos 73: 356-366.



Sabelis, M.W., Janssen, A., 1994. Evolution of life history patterns in the Phytoseiidae. In M.A. Houck (Ed): Mites: Ecological and Evolutionary Analyses of Life History Patterns. Chapman & Hall, New York. pp. 70-98.

Vet, L.E.M., Datema, A., Janssen, A., Snellen, H., 1994. The relation between clutch size and fitness in a larval-pupal endoparasitoid. Norw. J. Agric. Sci. Supp. 16: 141-145.

Vet, L.E.M., Datema, A., Janssen, A., Snellen, H., 1994. Clutch size in a larval-pupal endoparasitoid: consequences for fitness. J. Anim. Ecol. 63: 807-815.



Janssen, A., Yaninek, J.S. (Eds), 1993. Biological Control of the Cassava Green Mite. Special Issue Exp. Appl. Acarol. 17. 160 pp.

Janssen, A., Yaninek, J.S.,1993. Cassava green mites: a challenge for experts in biological control. Exp. Appl. Acarol. 17: 1-4.



Janssen, A., Sabelis, M.W., 1992. Phytoseiid life-histories, local predator-prey dynamics, and strategies for control of tetranychid mites. Exp. Appl. Acarol. 14: 233-250. doi: 10.1007/BF01200566



Janssen, A., van Alphen, J.J.M., Sabelis, M.W., Bakker, K., 1991. Microhabitat selection behaviour of Leptopilina heterotoma changes when odour of competitor is present. Redia 74: 203-210.

van der Hoeven, W.A.D. , Janssen, A.,  de Boer, R., 1991. Is the allergen level of house dust related to age of the house? Proc. Exp. Appl. Entomol. 2: 35-40.



Janssen, A. Hofker, C.D., Braun, A.R., Mesa, N., Sabelis, M.W., Bellotti, A.C. ,1990. Preselecting predatory mites for biological control: the use of an olfactometer. B. Entomol. Res. 80: 177-181.



Janssen, A., 1989. Optimal host selection by Drosophila parasitoids in the field. Funct. Ecol. 3: 469-479.



Janssen, A., Driessen, G., Haan, M. de, Roodbol, N., 1988. The impact of parasitoids on natural populations of temperate woodland Drosophila. Neth. J. Zool. 38: 61-73. doi: 10.1163/156854288X00049

Van Dinh, N., Janssen, A., Sabelis, M.W., 1988. Reproductive success of Amblyseius idaeus and A. anonymus on a diet of two-spotted spider mites. Exp. Appl. Acarol. 4: 41-51. doi: 10.1007/BF01213840

Van Dinh, N., Sabelis, M.W., Janssen, A., 1988. Influence of humidity and water availability on the survival of Amblyseius idaeus and A. anonymus (Acarinae: Phytoseiidae). Exp. Appl. Acarol. 4: 27-40. doi: 10.1007/BF01213839

Sabelis, M.W., Janssen, A., Helle, W.  (Eds), 1988. Population dynamics of Spider Mites and Predatory Mites. Proc. Europ. Assoc. Acarol. Amsterdam, The Netherlands, 5-10 July 1987. Special Issue Exp. Appl. Acarol. 4: 187-318.

Sabelis, M.W., Janssen, A., Helle, W.  (Eds), 1988. Population dynamics of Spider Mites and Predatory Mites. Proc. Europ. Assoc. Acarol. Amsterdam, The Netherlands, 5-10 July 1987. Special Issue Exp. Appl. Acarol. 5: 186-342.



van Alphen, J.J.M., Janssen, A.R.M., 1982. Host selection by Asobara tabida, a larval parasitoid of fruit- inhabiting Drosophila species. Neth. J. Zool. 32 : 194-214.












  • M.W. Sabelis, R. Hanna, A. Onzo, A. Pallini, I. Cakmak & A. Janssen (2009). Multiple predators, intraguild interactions and biological control of a single spider mite species. In E. Palevsky, P.G. Weintraub, U. Gerson & S. Simoni (Eds.), IOBC/WPRS working group „Integrated Control of Plant-Feeding Mites": Proceedings of a meeting at Florence (Italy), 9-12 March, 2009 Vol. 50. IOBC/WPRS Bulletin (pp. 83-94). Montfavet: IOBC/WPRS.


  • M.W. Sabelis, A. Janssen, I. Lesna, N.S. Aratchige, M. Nomikou & P.C.J. van Rijn (2008). Developments in the use of predatory mites for biological pest control. In A. Enkegaard (Ed.), Working group "Integrated Control in Protected Crops, Temperate Climate": Proceedings of the meeting at Sint-Michielsgestel (the Netherlands), 21-25 April, 2008 Vol. 32. IOBC/WPRS Bulletin (pp. 187-199). Montfavet: IOBC/WPRS.
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