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Our publications on birch moth and mountain birch

newJepsen, J.U., Biuw, M., Ims, R.A., Kapari, L., Schott, T., Vindstad, O.P.L., Hagen, S.B. (2013) Ecosystem impacts of a range expanding forest defoliator at the forest-tundra ecotone. Ecosystems Online Early DOI: 10.1007/s10021-012-9629-9.

newVindstad, O.P.L., Schott, T., Hagen, S.B., Jepsen, J.U., Kapari, L., Ims, R.A. (2013) How rapidly do invasive birch forest geometrids recruit larval parasitoids? – Insights from comparison with a sympatric native geometrid. Biological Invasions Online Early DOI 10.1007/s10530-012-0393-8.

Schott, T., Kapari, L., Hagen, S.B., Vindstad, O.P.L., Jepsen, J.U., Ims, R.A. (2013) Predator release from invertebrate generalists does not explain geometrid moth outbreaks at high altitudes. Canadian Entomologist In press

Schott T., Ims R.A., Hagen S.B. & Yoccoz N.G. (2012). Sources of variation in larval parasitism of two symmetrically outbreaking birch forest defoliators. Ecological Entomology, 37, 471-479.

Vindstad, O.P.L., Hagen, S.B., Jepsen, J.U., Kapari, L., Schott, T., Ims, R.A. (2011) Phenological diversity in the interactions between winter moth (Operophtera brumata) larvae and parasitoid wasps in sub-arctic mountain birch forest. Bull Ecol. Res. 101: 705-714.

Jepsen, J.U., Kapari, L., Hagen, S.B., Schott, T., Vindstad, O.P.L., Nilssen, A.C. & Ims, R.A. (2011). Rapid northwards expansion of a forest insect pest attributed to spring phenology matching with sub-arctic birch. Global Change Biology 17: 2071-2083.

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