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Our publications on birch moth and mountain birch
Vindstad, O.P.L., Schott, T., Hagen, S.B., Ims, R.A. (2010). Spatially patterned guild structure in larval parasitoids of cyclically outbreaking winter moth populations. Ecological Entomology 35: 456-463.
Schott, T., Hagen, S.B., Ims, R.A., Yoccoz, N.G. (2010). Are population outbreaks in sub-arctic geometrids terminated by larval parasitoids? Journal of Animal Ecology 79: 701-708.
Hagen, S.B., Jepsen, J.U, Schott, T., Ims, R.A. (2010). Spatially mis-matched trophic dynamics: cyclically outbreaking geometrids and threir larval parasitoids. Biology Letters 6:566-569.
Jepsen, J.U., Hagen, S.B., Karlsen, S.R., Ims, R.A. (2009). Phase-dependent outbreak dynamics of geometrid moth linked to host plant phenology. Proc. R. Soc. Lond. 276:4119-4128.
Jepsen, J.U., Hagen, S.B., Høgda, K.A., Ims, R.A., Karlsen, S.R., Tømmervik, H., Yoccoz, N.G. (2009). Monitoring the spatial dynamics of geometrid moth outbreaks in birch forest using MODIS-NDVI data. Remote Sensing of Environment 113: 1939-1947.
Archetti, M., Döring, T.F., Hagen, S.B, et al. (2009). Unravelling the evolution of autumn colours: an interdisciplinary approach. TREE 24(3): 166-173.
Hansen, N.M., Ims, R.A., Hagen, S.B. (2009). No impact of pupal predation on the altitudinal distribution of autumnal moth and winter moth (lepidoptera: geometridae) in sub-arctic birch forest. Environmental Entomology 38(3): 627-632.
Hagen, S.B., Jepsen, J.U., Yoccoz, N.G., Ims, R.A. (2008). Anisotropic patterned population synchrony in climatic gradients indicates nonlinear climatic forcing. Proc. R. Soc. Lond. 275: 1509-1515.
Jepsen, J.U., Hagen, S.B., Ims, R.A., Yoccoz, N.G. (2008). Climate change and outbreaks of the geometrids Operophtera brumata and Epirrita autumnata in sub-arctic birch forest: evidence of a recent outbreak range expansion. Journal of Animal Ecology 77: 257-264.
Hagen SB, Ims RA, Yoccoz NG, Sørlibråten O. (2008). Fluctuating asymmetry as an indicator of elevation stress and distribution limits in mountain birch (Betula pubescens). Plant Ecology 195: 157-163.
Hagen, S.B., Jepsen, J.U., Ims, R.A., Yoccoz, N.G. (2007). Shifting altitudinal distribution of outbreak zones of winter moth (Operophtera brumata) in sub-arctic birch forest: A response to recent climate warming? Ecography 30:299-307.
Hagen S. B., Sørlibråten, O., Ims R. A., Yoccoz, N. G. (2006). Density-Dependent melanism in winter moth larvae (Lepidoptera: Geometridae): A countermeasure against parasitoids? Environmental Entomology 35(5): 1247-1253.
Mjaaseth, R.R., Hagen, S.A., Yoccoz, N.G., Ims, R.A. (2005). Phenology and abundance in relation to climatic variation in a sub-arctic insect-herbivore mountain birch system. Oecologia 145: 53-65.
Ims R. A. , Yoccoz N. G. , Hagen S. B. (2004). Do sub-Arctic winter moth populations in coastal birch forest exhibit spatially synchronous dynamics? Journal of Animal Ecology 73 (6): 1129-1136
Hagen, S.B. , Debeausse, S. , Yoccoz, N.G. , Folstad, I. (2004). Autumn coloration as a signal of tree condition. Proceedings of the Royal Society of London Series B 271: S184-S185 (Suppl.).
Hagen, S.B. , Ims, R.A., Yoccoz, N.G. (2003). Density-dependent melanism in sub-arctic populations of winter moth larvae (Operophtera brumata) . Ecological Entomology 28 (6): 659-665
Hagen, S.B. , Folstad, I., Jakobsen, S.W. (2003). Autumn colouration and herbivore resistance in mountain birch (Betula pubescens) . Ecology Letters 6 (9): 807-811