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Freedom to move: Arctic caterpillar (Lepidoptera) growth rate increases with access to new willows (Salicaceae)

  • Christopher J. Greyson-Gaito (a1) (a2), Matthew A. Barbour (a1), Mariano A. Rodriguez-Cabal (a1) (a3), Gregory M. Crutsinger (a1) and Gregory H.R. Henry (a2)...


Movement between host plants during the growing season is a common behaviour among insect herbivores, although the mechanisms promoting these movements are poorly understood for many systems. Two possible reasons why insect herbivores relocate include compensating for host plant quantity and/or quality changes and the avoidance of natural enemies. The Arctic caterpillar (Gynaephora groenlandica (Wocke); Lepidoptera: Lymantriidae) moves several metres each day, feeds on its patchily distributed host plant, Arctic willow (Salix arctica Pallas; Salicaceae), and has two main natural enemies, the parasitoids Exorista thula Wood (Diptera: Tachinidae) and Hyposoter diechmanni (Nielsen) (Hymenoptera: Ichneumonidae). We physically moved caterpillars between Arctic willows and restricted other caterpillar individuals each to a single willow throughout the active period of Arctic caterpillars. We found that growth rate, herbivory rate, and the proportion of available leaf fascicles eaten were higher for experimentally moved caterpillars. Parasitoid abundances were low and did not differ between experimentally moved and stationary caterpillars. Taken together, our study addresses the bottom–up and top–down controls on insect herbivore movement during the short duration of the growing season in the Arctic. Our results suggest that caterpillars are likely moving to new willow shrubs to access high quality resources.


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Abràmoff, M.D., Magalhães, P.J., and Ram, S.J. 2004. Image processing with ImageJ. Biophotonics International, 11: 3642.
Agrawal, A.A. 1999. Induced responses to herbivory in wild radish: effects on several herbivores and plant fitness. Ecology, 80: 17131723.
Barrio, I.C., Schmidt, B.C., Cannings, S., and Hik, D.S. 2013. First records of the Arctic moth Gynaephora groenlandica (Wocke) south of the Arctic Circle: a new alpine subspecies. Arctic, 66: 429434.
Berg, T.B. 2003. Catechin content and consumption ratio of the collared lemming. Oecologia, 135: 242249.
Charnov, E.L. 1976. Optimal foraging, the marginal value theorem. Theoretical Population Biology, 9: 129136.
Cornelissen, J.H.C., Lavorel, S., Garnier, E., Díaz, S., Buchmann, N., Gurvich, D.E., et al. 2003. A handbook of protocols for standardised and easy measurement of plant functional traits worldwide. Australian Journal of Botany, 51: 335380.
Cronin, J.T. 2003. Movement and spatial population structure of a prairie planthopper. Ecology, 84: 11791188.
Cruz-Rivera, E. and Hay, M.E. 2001. Macroalgal traits and the feeding and fitness of an herbivorous amphipod: the roles of selectivity, mixing, and compensation. Marine Ecology Progress Series, 218: 249266.
Denno, R.F., Gratton, C., Peterson, M.A., Langellotto, G.A., Finke, D.L., and Huberty, A.F. 2002. Bottom-up forces mediate natural-enemy impact in a phytophagous insect community. Ecology, 83: 14431458.
Dethier, V.G. 1989. Patterns of locomotion of polyphagous arctiid caterpillars in relation to foraging. Ecological Entomology, 14: 375386.
Ellison, G.N. and Gotelli, N.J. 2004. A primer of ecological statistics. Sinauer, Sunderland, Massachusetts, United States of America.
Finidori-Logli, V., Bagnères, A.-G., and Clément, J.-L. 1996. Role of plant volatiles in the search for a host by parasitoid Diglyphus isaea (Hymenoptera: Eulophidae). Journal of Chemical Ecology, 22: 541558.
Flores, L., Larrañaga, A., and Elosegi, A. 2014. Compensatory feeding of a stream detritivore alleviates the effects of poor food quality when enough food is supplied. Freshwater Science, 33: 134141.
Greeney, H.F., Dyer, L.A., and Smilanich, A.M. 2012. Feeding by lepidopteran larvae is dangerous: a review of caterpillars’ chemical, physiological, morphological, and behavioral defenses against natural enemies. Invertebrate Survival Journal, 9: 734.
Greyson-Gaito, C.J., Barbour, M.A., Rodriguez-Cabal, M.A., Crutsinger, G.M., and Henry, G.H.R. 2015. Effect of movement between Salix arctica individuals on Gynaephora groenlandica caterpillar growth rates at Alexandra Fiord, Nunavut, Canada, 2013 [data file and metadata]. Available from [accessed 19 March 2016].
Gruner, D.S. 2004. Attenuation of top-down and bottom-up forces in a complex terrestrial community. Ecology, 85: 30103022.
Gutbrodt, B., Dorn, S., Unsicker, S.B., and Mody, K. 2012. Species-specific responses of herbivores to within-plant and environmentally mediated between-plant variability in plant chemistry. Chemoecology, 22: 101111.
Heinrich, B. 1979. Foraging strategies of caterpillars. Oecologia, 42: 325337.
Henry, G.H.R., Freedman, B., and Svoboda, J. 1986. Vegetated areas and muskox populations in east-central Ellesmere Island. Arctic, 39: 7881.
Hulten, E. 1968. Flora of Alaska and neighboring territories. Stanford University Press, Stanford, California, United States of America.
Jackman, S. 2015. pscl: classes and methods for R developed in the Political Science Computational Laboratory, Stanford University. R package version 1.4.9. Department of Political Science, Stanford University, Stanford, California, United States of America.
Johns, R., Ozaki, K., and Tobita, H. 2012. Dietary mixing within the crown of a deciduous conifer enhances the fitness of a specialist sawfly. Animal Behaviour, 84: 13931400.
Jones, M.H., MacDonald, S.E., and Henry, G.H.R. 1999. Sex- and habitat-specific responses of a high Arctic willow, Salix arctica, to experimental climate change. Oikos, 87: 129138.
Karban, R., Karban, C., Huntzinger, M., Pearse, I., and Crutsinger, G. 2010. Diet mixing enhances the performance of a generalist caterpillar, Platyprepia virginalis . Ecological Entomology, 35: 9299.
Karban, R. and Myers, J.H. 1989. Induced plant responses to herbivory. Annual Review of Ecology and Systematics, 20: 331348.
Kessler, A. 2001. Defensive function of herbivore-induced plant volatile emissions in nature. Science, 291: 21412144.
Kevan, P.G. and Kukal, O. 1993. Corrigendum: a balanced life table for Gynaephora groenlandica (Lepidoptera: Lymantriidae), a long-lived high Arctic insect, and implications for the stability of its populations. Canadian Journal of Zoology, 71: 16991701.
Kukal, O. 1995. Winter mortality and the function of larval hibernacula during the 14-year life cycle of an Arctic moth, Gynaephora groenlandica . Canadian Journal of Zoology, 73: 657662.
Kukal, O. and Kevan, P.G. 1987. The influence of parasitism on the life history of a High Arctic insect, Gynaephora groenlandica (Wöcke) (Lepidoptera: Lymantriidae). Canadian Journal of Zoology, 65: 156163.
Lorch, P.D., Sword, G.A., Gwynne, D.T., and Anderson, G.L. 2005. Radiotelemetry reveals differences in individual movement patterns between outbreak and non-outbreak mormon cricket populations. Ecological Entomology, 30: 548555.
Loxdale, H.D. and Lushai, G. 1999. Slaves of the environment: the movement of herbivorous insects in relation to their ecology and genotype. Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences, 354: 14791495.
Mody, K., Unsicker, S.B., and Linsenmair, K.E. 2007. Fitness related diet-mixing by intraspecific host-plant-switching of specialist insect herbivores. Ecology, 88: 10121020.
Morehead, S.A. and Feener, D.H. 2000. Visual and chemical cues used in host location and acceptance by a Dipteran parasitoid. Journal of Insect Behavior, 13: 613625.
Morewood, D.W. 1999. Temperature/development relationships and life history strategies of Arctic Gynaephora species (Lepidoptera: Lymantriidae) and their insect parasitoids (Hymenoptera: Ichneumonidae and Diptera: Tachinidae), with reference to predicted global warming. Ph.D. dissertation University of Victoria, Victoria, British Columbia, Canada. Available from [accessed 24 March 2016].
Morewood, D.W. and Ring, R.A. 1998. Revision of the life history of the High Arctic moth Gynaephora groenlandica (Wöcke) (Lepidoptera: Lymantriidae). Canadian Journal of Zoology, 76: 13711381.
Muc, M., Freedman, B., and Svoboda, J. 1989. Vascular plant communities of a polar oasis at Alexandra Fiord (79 N), Ellesmere Island, Canada. Canadian Journal of Botany, 67: 11261136.
Nykänen, H. and Koricheva, J. 2004. Damage-induced changes in woody plants and their effects on insect herbivore performance: a meta-analysis. Oikos, 104: 247268.
Palo, R.T. 1984. Distribution of birch (Betula spp.), willow (Salix spp.), and poplar (Populus spp.) secondary metabolites and their potential role as chemical defense against herbivores. Journal of Chemical Ecology, 10: 499520.
Pearse, I.S., Hughes, K., Shiojiri, K., Ishizaki, S., and Karban, R. 2013. Interplant volatile signaling in willows: revisiting the original talking trees. Oecologia, 172: 869875.
Puckett, R.T., Calixto, A., Barr, C.L., and Harris, M. 2007. Sticky traps for monitoring Pseudacteon parasitoids of Solenopsis fire ants. Environmental Entomology, 36: 584588.
R Core Team. 2012. R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. R program version 3.2.4. Available from [accessed 19 March 2016].
Rodriguez-Cabal, M.A., Barrios-Garcia, M.N., Amico, G.C., Aizen, M.A., and Sanders, N.J. 2013. Node-by-node disassembly of a mutualistic network driven by species introductions. Proceedings of the National Academy of Sciences, 110: 1650316507.
Sime, K.R. 2005. The natural history of the parasitic wasp Trogus pennator (Hymenoptera: Ichneumonidae): host-finding behaviour and a possible host countermeasure. Journal of Natural History, 39: 13671380.
Singer, M. and Stireman, J. 2001. How foraging tactics determine host-plant use by a polyphagous caterpillar. Oecologia, 129: 98105.
Steltzer, H., Hufbauer, R.A., Welker, J.M., Casalis, M., Sullivan, P.F., and Chimner, R. 2008. Frequent sexual reproduction and high intraspecific variation in Salix arctica: implications for a terrestrial feedback to climate change in the High Arctic. Journal of Geophysical Research, 113: 111, (G3S10).
Strathdee, A.T. and Bale, J.S. 1998. Life on the edge: insect ecology in Arctic environments. Annual Review of Entomology, 43: 85106.
Van Dam, N.M, Hadwich, K., and Baldwin, I.T. 2000. Induced responses in Nicotiana attenuata affect behavior and growth of the specialist herbivore Manduca sexta . Oecologia, 122: 371379.
Várkonyi, G. and Roslin, T. 2013. Freezing cold yet diverse: dissecting a High-Arctic parasitoid community associated with Lepidoptera hosts. The Canadian Entomologist, 145: 193218.
Waldbauer, G.P. 1968. The consumption & utilisation of food by insects. Advances in Insect Physiology, 5: 229288.
Wickham, H. 2009. ggplot2: elegant graphics for data analysis. Springer, New York, New York, United States of America. [accessed 19 March 2016].
Wilson, J.W. 1964. Annual growth of Salix arctica in the High-Arctic. Annals of Botany, 28: 7176.

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Freedom to move: Arctic caterpillar (Lepidoptera) growth rate increases with access to new willows (Salicaceae)

  • Christopher J. Greyson-Gaito (a1) (a2), Matthew A. Barbour (a1), Mariano A. Rodriguez-Cabal (a1) (a3), Gregory M. Crutsinger (a1) and Gregory H.R. Henry (a2)...


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