Dr.
Joanneke H. Reudler Talsma
Centre
of Excellence in Evolutionary Research
Department of Biological and
Environmental Science
P.O.
Box 35, FIN-40014
University
of Jyväskylä, Finland
e-mail:
talsma.reudler(a)jyu.fi or jhtalsma@hotmail.com
tel.
+358 (0) 408053921
Project
Host plant chemistry, especially allelochemistry, is
known to play an important role in mediating the interaction of herbivores with
their predators and parasitoids. One mechanism for this mediation is herbivore
sequestration of host plant allelochemicals, which serve as a defence against
natural enemies. Aposematic species even advertise to predators their
unprofitability with conspicuous warning colours. Theoretical approaches to
prey defence have traditionally dealt only with the education and survival of
predators but ignored other selection pressures such as the cost of
sequestering or other constraints caused by the herbivore diet. Moreover, most
prey animals are target of multiple enemies and thus, a high-quality defence
against predators does not necessarily guarantee defence against parasitoids
and diseases. In this project I will examine how the sequestration of plant
allelochemicals affects the defence of specialist and generalist herbivores
against multiple enemies (predator (warning signal size), parasitoids
(encapsulation ability) and diseases (survival)).
A
model system of plants containing iridoid glycosides, three different
caterpillars (non-sequestering generalist, aposematic sequestering generalist
and a sequestering specialist), their parasitoids and a generalist bacterial
pathogen, will be used to investigate the roles of sequestered plant
allelochemicals in herbivore-parasitoid-disease interactions. Three experiments
will be performed. In the first I will look at the sequestration and excretion
of the plant chemicals in the herbivore diets, in the different developmental
stages of the caterpillars and their parasitoids. In the second experiment I
will look at the effect of varying iridoid concentration in the herbivore diet
on naïve and specific encapsulation ability of the different caterpillars
and look at the effect of multiple infections (parasitoid and disease). In the third experiment I will look at
the parasitoid preference in the field and in dual choice experiments, with
respect to the herbivore diet and the warning signal size of the aposematic
larvae.
These
experiments will increase our knowledge about the importance of plant chemicals
on higher trophic levels. A lot of research has already been done with
predator-prey interactions, but information about one of the main natural
enemies of herbivores, parasitoids, is lacking. With this project I investigate
how important plant chemicals are in the defence of herbivores against
parasitoids, depending on the amount of plant chemicals they eat, their ability
to sequestrate these chemicals, and their effects under laboratory conditions,
but also in the field.
Publications
Refereed Journals
Saskya van Nouhuys, Joanneke H. Reudler, Arjen Biere, Jeffery A. Harvey 2012
Performance of secondary parasitoids on chemically
defended and undefended hosts. Basic and Applied Ecology
M. Laurentz, J.H. Reudler, J. Mappes, V.
Friman, S. Ikonen and C. Lindstedt 2012
Diet quality can play a critical role in defense
efficacy against parasitoids and pathogens in the Glanville Fritallary (Melitaea cinxia)
Journal of Chemical
Ecology 1: 116-125
DOI
10.1007/s10886-012-0066-1
O. Nokelainen, R. Hegna, J.H. Reudler, C.
Lindstedt & J. Mappes. 2012 (link)
Trade-off between
warning signal efficacy and mating success in the wood tiger moth. Proc. R. Soc. B 279: 257–265
DOI
10.1098/rspb.2011.0880
Reudler, J. H., Biere, A.,
Harvey, J. A., van Nouhuys, S. 2011 PDF
Differential performance of a specialist and two generalist herbivores and
their parasitoids on Plantago lanceolata. Journal of Chemical Ecology 37:765-778
DOI
10.1007/s10886-011-9983-7
Lindstedt, C., Reudler Talsma, J. H.,
Ihalainen, E., Lindström, L. & Mappes, J. 2010 (link)
Diet quality affects warning coloration
indirectly: excretion costs in a generalist herbivore. Evolution 64: 68-78
DOI: 10.1111/j.1558-5646.2009.00796.x
J.H. Reudler Talsma, Torri, K. van Nouhuys, S. 2008 PDF
Host plant use by the Heath fritillary butterfly, Melitaea athalia:
plant habitat, species and chemistry.
Arthropod-Plant Interactions
2: 63-75
DOI
10.1007/s11829-008-9039-2
J.H. Reudler Talsma, Biere, A., Harvey, J. A., van Nouhuys, S. 2008 PDF
Oviposition cues for a specialist butterfly: plant chemistry and size. Journal of Chemical Ecology 34: 2102-1212
DOI
10.1007/s10886-008-9519-y
J.H. Reudler Talsma, J.A. Elzinga, J.A. Harvey, A. Biere 2007 (link)
Optimum and maximum host size at parasitism for the endoparasitoid
Hyposoter didymator (Hymenoptera: Ichneumonidae) differ
greatly between two host species. Environmental
Entomology 36 (5): 1048-1053
DOI 10.1603/0046-225X
M.V. Schneider, G. Driessen, L.W. Beukeboom, R. Boll, K. van Eunen, A. Selzner, J.H.
Talsma, L. Lapchin 2003 (link)
Gene flow between arrhenotokous and thelytokous populations of Venturia canescens (Hymenoptera). Heredity 90 (3): 260-267
DOI 10.1038/sj.hdy.6800245
Other publications
J.H. Reudler Talsma 2007 PDF
Costs and benefits of iridoids glycosides in
multitrophic systems. PhD thesis. Wageningen University, the Netherlands
Submitted/in review
In preparation
J.H. Reudler, S. C. Honders, H. Turin and A. Biere
Trade-offs between chemical defence and regrowth
capacity in Plantago lanceolata.
J. H. Reudler and S. van Nouhuys
The effect of host plant use on the parasitation rate
of Pteromalus apum
J. H Reudler, C. Lindstedt, I. Lehtinen and J. Mappes
Role of iridoid glycosides in the diet of Parasemia plantaginis