Publikationer / Publications

Chapurlat, E., J. Ågren, J. Anderson, M. Friberg, and N. Sletvold. 2019. Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea. New Phytologist, in press.

Trunschke, J., N. Sletvold, and J. Ågren. 2019. The independent and combined effects of floral traits distinguishing two pollination ecotypes of a moth-pollinated orchid. Ecology and Evolution 9:1191–1201.

Thomann, M., J. Ehrlén, and J. Ågren. 2018. Grazers affect selection on inflorescence height both directly and indirectly and effects change over time. Ecology 99: 2167-2175.

Price, N., B. T. Moyers, L. Lopez, J. R. Lasky, J. G. Monroe, J. L. Mullen, C. G. Oakley, J. Lin, J. Ågren, D. R. Schrider, A. D. Kern, and J. K. McKay. 2018. Combining population genomics and fitness QTL to identify the genetics of local adaptation in Arabidopsis thaliana. Proceedings of the National Academy of Sciences USA 115: 5028–5033.

Postma, F. M, and J. Ågren. 2018. Among-year variation in selection during early life stages and the genetic basis of fitness in Arabidopsis thaliana. Molecular Ecology 27: 2498-2511.

Urbina, H., M. F. Breed, W. Zhao, K. L. Gurrala, S. G. E. Andersson, J. Ågren, S. Baldauf, and A. Rosling. 2018. Specificity in Arabidopsis thaliana recruitment of root fungal communities from soil and rhizosphere. Fungal Biology 122: 231-240.

Laenen, B., A. Tedder, M. D. Nowak, P. Toräng, J. Wunder, S. Wötzel, K. A. Steige, Y. Kourmpetis, T. Odong, A. D. Drouzas, M. C. A. M. Bink, J. Ågren, G. Coupland, and T. Slotte.  2018. Demography and mating system shape the genome-wide impact of purifying selection in Arabis alpina. Proceedings of the National Academy of Sciences USA 115: 816-821.

Chapurlat, E., J. Anderson, J. Ågren, M. Friberg, and N. Sletvold. 2018. Diel pattern of floral scent emission matches the relative importance of diurnal and nocturnal pollinators in populations of Gymnadenia conopsea. Annals of Botany 121: 711-721.

Toräng, P., L. Vikström, J. Wunder, S. Wötzel, G. Coupland, and J. Ågren. 2017. Evolution of the selfing syndrome: Anther orientation and herkogamy together determine reproductive assurance in a self-compatible plant. Evolution 71: 2206-2218.

Trunschke, J., N. Sletvold, and J. Ågren. 2017. Interaction intensity and pollinator-mediated selection. New Phytologist 214: 1381-1389.

Ågren, J., C. G. Oakley, S. Lundemo, and D. W. Schemske. 2017. Adaptive divergence in flowering time among natural populations of Arabidopsis thaliana: estimates of selection and QTL mapping. Evolution 71: 550-564.

Sletvold, N., M. Tye, and J. Ågren. 2017. Resource- and pollinator-mediated selection on floral traits. Functional Ecology 31:135-141.

Colautti, R. I., J. Ågren, and J. T. Anderson. 2017. Phenological shifts of native and invasive species under climate change: insights from the Boechera - Lythrum model. Philosophical Transactions of the Royal Society B 372: 20160032.

Puentes, A., G. Granath, and J. Ågren. 2016. Similarity in G matrix structure among natural populations of Arabidopsis lyrata. Evolution 70:2370-2386.

Sletvold, N., and J. Ågren. 2016. Experimental reduction in interaction intensity strongly affects biotic selection. Ecology 97:3091-3098.

Postma, F. M., and J. Ågren. 2016. Early life stages contribute strongly to local adaptation in Arabidopsis thaliana. Proceedings of the National Academy of Sciences USA 113: 7590-7595.

Videvall, E., N. Sletvold, J. Hagenblad, J. Ågren, and B. Hansson. 2016. Strong maternal effects on gene expression in Arabidopsis lyrata hybrids. Molecular Biology and Evolution 33:984-994.

Sletvold, N., J. Trunschke, M. Smit, J. Verbeek, and J. Ågren. 2016. Strong pollinator-mediated selection for increased flower brightness and contrast in a deceptive orchid. Evolution 70:716-724.

Lehndal, L., P. A. Hambäck, L. Ericson, and J. Ågren. 2016. Herbivory strongly influences among-population variation in reproductive output of Lythrum salicaria in its native range. Oecologia 180:1159-1171. Erratum.

Postma, F. M., S. Lundemo, and J. Ågren. 2016. Seed dormancy cycling and mortality differ between two locally adapted populations of Arabidopsis thaliana. Annals of Botany 117:249-256.

Chapurlat, E., J. Ågren, and N. Sletvold. 2015. Spatial variation in pollinator-mediated selection on phenology, floral display and spur length in the orchid Gymnadenia conopsea. New Phytologist 208:1264-1275.

Lehndal, L., and J. Ågren. 2015. Herbivory differentially affects plant fitness in three populations of the perennial herb Lythrum salicaria along a latitudinal gradient. PLOS ONE 10(9): e0135939.

Oakley, C. G., J. Ågren, and D. W. Schemske. 2015. Heterosis and outbreeding depression in crosses between natural populations of Arabidopsis thaliana. Heredity 115:73-82.

Sletvold, N., and J. Ågren. 2015. Non-linear costs of reproduction in a long-lived plant. Journal of Ecology 103:1205-1213.

Menzel, M., N. Sletvold, J. Ågren, and B. Hansson. 2015. Inbreeding affects gene expression differently in two self-incompatible Arabidopsis lyrata populations with similar levels of inbreeding depression. Molecular Biology and Evolution 32:2036–2047.

Lehndal, L., and J. Ågren. 2015. Latitudinal variation in resistance and tolerance to herbivory in the perennial herb Lythrum salicaria is related to intensity of herbivory and plant phenology. Journal of Evolutionary Biology 28:576-589.

Sletvold, N., and J. Ågren. 2015. Climate-dependent costs of reproduction: Survival and fecundity costs decline with length of the growing season and summer temperature. Ecology Letters 18:357-364.

Postma, F. M., and J. Ågren. 2015. Maternal environment affects the genetic basis of seed dormancy in Arabidopsis thalianaMolecular Ecology 24:785–797.

Jakobsson, A., B. Padrón, and J. Ågren. 2015. Distance-dependent effects of invasive Lupinus polyphyllus on pollination and reproductive success of two native herbs. Basic and Applied Ecology 16:120-127.

Toräng, P., J. Wunder, J. R. Obeso, M. Herzog, G. Coupland, and J. Ågren. 2015. Large-scale adaptive differentiation in the alpine perennial herb Arabis alpina.New Phytologist 206:459–470.

Sletvold, N., K. K. Moritz, and J. Ågren. 2015. Additive effects of pollinators and herbivores result in both conflicting and reinforcing selection on floral traits.Ecology 96:214-221.

Oakley, C. G., J. Ågren, R. A. Atchison, and D. W. Schemske. 2014. QTL mapping of freezing tolerance: links to fitness and adaptive trade-offs. Molecular Ecology 23:4304-4215.

Dittmar, E. L., C. G. Oakley, J. Ågren, and D. W. Schemske. 2014. Flowering time QTL in natural populations of Arabidopsis thaliana and implications for their adaptive value. Molecular Ecology 23:4291-4303.

Sletvold, N., and J. Ågren. 2014. There is more to pollinator-mediated selection than pollen limitation. Evolution 68: 1907-1918.

Jakobsson, A., and J. Ågren. 2014. Distance to semi-natural grassland influences seed production of insect-pollinated herbs. Oecologia 175:199-208.

Puentes, A., and J. Ågren. 2014. No trade-off between trichome production and tolerance to leaf and inflorescence damage in a natural population of Arabidopsis lyrata. - Journal of Plant Ecology 7: 373-383.

Akiyama, R. and J. Ågren. 2014. Conflicting selection on the timing of germination in a natural population of Arabidopsis thaliana. - Journal of Evolutionary Biology 27: 193-199.

von Euler, T., J. Ågren, and J. Ehrlén. 2014. Environmental context influences both the intensity of seed predation and plant demographic sensitivity to attack. Ecology 95:495-504.

Boberg, E., R. Alexandersson, M. Jonsson, J. Maad, J. Ågren, and L. A. Nilsson. 2014. Pollinator shifts and the evolution of spur length in the moth-pollinated orchid Platanthera bifoliaAnnals of Botany 113: 267-275.

Ågren, J., C. G. Oakley, J. K. McKay, J. T. Lovell, and D. W. Schemske. 2013. Genetic mapping of adaptation reveals fitness trade-offs in Arabidopsis thalianaProceedings of the National Academy of Sciences USA 110: 21077-21087.

Ågren, J., F. Hellström, P. Toräng, and J. Ehrlén. 2013. Mutualists and antagonists drive among-population variation in selection and evolution of floral display in a perennial herb. Proceedings of the National Academy of Sciences USA 110:18202-18207.

Puentes, A., and J. Ågren. 2013. Trichome production and variation in young plant resistance to the specialist insect herbivore Plutella xylostella among natural populations of Arabidopsis lyrataEntomologia Experimentalis et Applicata 149:166-176.

Sletvold, N., M. Mousset, J. Hagenblad, B. Hansson, and J. Ågren. 2013. Strong inbreeding depression in two Scandinavian populations of the self-incompatible perennial herb Arabidopsis lyrataEvolution 67:2876-2888.

Sletvold, N., J. M. Grindeland, and J. Ågren. 2013. Vegetation context influences the strength and targets of pollinator-mediated selection in a deceptive orchid.Ecology 94:1236-1242.

Vanhoenacker, D., J. Ågren, and J. Ehrlén. 2013. Non-linear relationship between intensity of plant-animal interactions and selection strength. Ecology Letters 16:198-205.

von Euler, T., J. Ågren, and J. Ehrlén. 2012. Floral display and habitat quality affect cost of reproduction in Primula farinosaOikos 121:1400-1407.

Sletvold, N., J. Trunschke, C. Wimmergren, and J. Ågren. 2012. Separating selection by diurnal and nocturnal pollinators on floral display and spur length in Gymnadenia conopseaEcology 93:1880-1891.

Sletvold, N., J. M. Grindeland, P. Zu, and J. Ågren. 2012. Strong inbreeding depression and local outbreeding depression in the rewarding orchid Gymnadenia conopseaConservation Genetics 13:1305-1315.

Puentes, A., and J. Ågren. 2012. Additive and non-additive effects of simulated leaf and inflorescence damage on survival, growth and reproduction of the perennial herb Arabidopsis lyrataOecologia 169: 1033-1042.

Ågren, J., and D. W. Schemske. 2012. Reciprocal transplants demonstrate strong adaptive differentiation of the model organism Arabidopsis thaliana in its native range. New Phytologist 194:1112-1122.

Sletvold, N., and J. Ågren. 2012. Variation in tolerance to drought among Scandinavian populations of Arabidopsis lyrataEvolutionary Ecology 26:559-577.

Akiyama, R., and J. Ågren. 2012. Magnitude and timing of leaf damage affect seed production in a natural population of Arabidopsis thaliana (Brassicaceae).PLoS ONE 7(1): e30015.

Sletvold, N., and J. Ågren. 2011. Nonadditive effects of floral display and spur length on reproductive success in a deceptive orchid. Ecology 92:2167-2174.

Falahati-Anbaran, M., S. Lundemo, J. Ågren, and H. K. Stenøien. 2011. Genetic consequences of seed banks in the perennial herb Arabidopsis lyrata ssp. petraea(Brassicaceae). American Journal of Botany 98:1475-1485.

Sletvold, N. and J. Ågren. 2011. Among-population variation in costs of reproduction in the long-lived orchid Gymnadenia conopsea: an experimental study. Oecologia 167:461-468.

Sletvold, N., and J. Ågren. 2010. Pollinator-mediated selection on floral display and spur length in the orchid Gymnadenia conopseaInternational Journal of Plant Sciences 171:999-1009.

Sletvold, N., Huttunen, P., Handley, R., Kärkkäinen, K. & Ågren, J. 2010. Cost of trichome production and resistance to a specialist insect herbivore in Arabidopsis lyrataEvolutionary Ecology 24:1307-1319.

Huttunen, P., K. Kärkkäinen, G. Løe, P. Rautio, and J. Ågren. 2010. Leaf trichome production and responses to defoliation and drought in Arabidopsis lyrata (Brassicaceae). Annales Botanici Fennici 47: 199-207. 

Toräng, P., J. Ehrlén, and J. Ågren. 2010. Habitat quality and among-population differentiation in reproductive effort and flowering phenology in the perennial herb Primula farinosaEvolutionary Ecology 24:715-729

Sletvold, N., Grindeland, J. M., and J. Ågren. 2010. Pollinator-mediated selection on floral display, spur length and flowering phenology in the deceptive orchid Dactylorhiza lapponicaNew Phytologist 188:385-392

Toräng, P., Ehrlén, J. & Ågren, J. 2010. Linking environmental and demographic data to predict future population viability of a perennial herb. Oecologia 163:99-109

Vanhoenacker, D., Toräng, P., Ågren, J. & Ehrlén, J. 2010. Morph-specific selection on floral traits in a polymorphic plant. Journal of Evolutionary Biology 23:1251-1260

Platt, A., M. Horton, Y. S. Huang, Y. Li, A. E. Anastasio, N. W. Mulyati, J. Ågren, O. Bossdorf, D. Byers, K. Donohue, M. Dunning, E. Holub, A. Hudson, V. Le Corre, O. Loudet, F. Roux, N. Warthmann, D. Weigel, L. Rivero, R. Scholl, M. Nordborg, J. Bergelson, and J. O. Borevitz. 2010. The scale of population structure in Arabidopsis thalianaPLoS Genetics 6(2): e1000843 

Fogelqvist, J., Niittyvuopio, A., Ågren, J., Savolainen, O. & Lascoux, M. 2010. Cryptic population genetic structure: the number of inferred clusters depends on sample size. Molecular Ecology Resources 10:314-323

Boberg, E., and J. Ågren. 2009. Despite their apparent integration, spur length but not perianth size affects reproductive success in the moth-pollinated orchid Platanthera bifoliaFunctional Ecology 23:1022-1028

Leinonen, P. H., S. Sandring, B. Quilot, M. J. Clauss, T. Mitchell-Olds, J. Ågren, and O. Savolainen. 2009. Local adaptation in European populations of Arabidopsis lyrata (Brassicaceae). American Journal of Botany 96:1129-1137

Johnson, S. D., E. Torninger, and J. Ågren. 2009. Relationships between population size and pollen fates in a moth-pollinated orchid. Biology Letters 5:282-285

Frenkel, M., C. Külheim, H. Johansson Jänkäpää, O. Skogström, L. Dall’Osto, J. Ågren, R. Bassi, T. Moritz, J. Moen, and S. Jansson. 2009. Improper excess light energy dissipation in Arabidopsis results in metabolic reprogramming. BMC Plant Biology 9:12.

Vanhoenacker, D., J. Ågren, and J. Ehrlén. 2009. Spatial variability in seed predation in Primula farinosa: local population legacy vs. patch selection.Oecologia 160:77-86

Sandring, S., and J. Ågren. 2009. Pollinator-mediated selection on floral display and flowering time in the perennial herb Arabidopsis lyrataEvolution 63:1292-1300

Toräng, P., J. Ehrlén, and J. Ågren. 2008. Mutualists and antagonists mediate frequency-dependent selection on floral display. Ecology 89:1564-1572

Ågren, J., J. Ehrlén, and C. Solbreck. 2008. Spatio-temporal variation in fruit production and seed predation in a perennial herb influenced by habitat quality and population size. Journal of Ecology 96:334-345

Dalin, P., J. Ågren, C. Björkman, P. Huttunen, and K. Kärkkäinen. 2008. Leaf trichome formation and plant resistance to herbivory. In: A. Schaller (ed) Induced Plant Resistance to Herbivory. Springer Verlag, pp. 89-105. 

Gaudeul, M., H. Stenøien, and J. Ågren. 2007. Landscape structure, clonal propagation, and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae). American Journal of Botany 94:1146-1155.

Sandring, S., M.-A. Riihimäki, O. Savolainen, and J. Ågren. 2007. Selection on flowering time and floral display in an alpine and a lowland population of Arabidopsis lyrataJournal of Evolutionary Biology 20:558-567.

Løe, G., P. Toräng, M. Gaudeul, and J. Ågren. 2007. Trichome production and spatiotemporal variation in herbivory in the perennial herb Arabidopsis lyrata.Oikos 116:134-142.

Kivimäki, M., K. Kärkkäinen, M. Gaudeul, G. Løe, and J. Ågren. 2007. Gene, phenotype and function: GLABROUS1 and resistance to herbivory in natural populations of Arabidopsis lyrataMolecular Ecology 16:453-462

Ågren, J., C. Fortunel, and J. Ehrlén. 2006. Selection on floral display in insect-pollinated Primula farinosa: effects of vegetation height and litter accumulation.Oecologia 150:225-232

Toräng, P., J. Ehrlén, and J. Ågren. 2006. Facilitation in an insect-pollinated herb with a floral display dimorphism. Ecology 87:2113-2117

Vanhoenacker, D., J. Ågren, and J. Ehrlén. 2006. Spatio-temporal variation in pollen limitation and reproductive success of two scape morphs in Primula farinosaNew Phytologist 169:615-621

Nilsson, E., and J. Ågren. 2006. Population size, female fecundity, and sex ratio variation in gynodioecious Plantago maritimaJournal of Evolutionary Biology 19:825-833

Waites, A. R., and J. Ågren. 2006. Stigma receptivity and effects of prior self-pollination on seed set in tristylous Lythrum salicaria (Lythraceae). American Journal of Botany 93:142-147

Handley, R.J., B. Ekbom, and J. Ågren. 2005. Variation in trichome density and resistance against a specialist herbivore in natural populations of Arabidopsis thalianaEcological Entomology 30:284-292

Kärkkäinen, K., G. Løe, and J. Ågren. 2004. Population structure in Arabidopsis lyrata: evidence for divergent selection on trichome production. Evolution 58:2831-2836

Johnson, S. D., C. L. Collin, H. J. Wissman, E. Halvarsson, and J. Ågren. 2004. Factors contributing to variation in seed production among remnant populations of the endangered daisy Gerbera aurantiacaBiotropica 36:148-155

Waites, A. R., and J. Ågren. 2004. Pollinator visitation, stigmatic pollen loads, and among-population variation in seed set in Lythrum salicariaJournal of Ecology 92:512-526

Johnson, S. D., C. I. Peter, and J. Ågren. 2004. The effects of nectar addition on pollen removal and geitonogamy in the non-rewarding orchid Anacamptis morio.Proceedings of the Royal Society London B 271:803-809

Johnson, S. D., C. I. Peter, L. A. Nilsson, and J. Ågren. 2003. Pollination success in a deceptive orchid is enhanced by co-occurring rewarding magnet plants.Ecology 84:2919-2927

Olsson, K., and J. Ågren. 2002. Latitudinal population differentiation in phenology, life history and flower morphology in the perennial herb Lythrum salicariaJournal of Evolutionary Biology 15:983-996

Kärkkäinen, K., and J. Ågren. 2002. Genetic basis of trichome production inArabidopsis lyrataHereditas 136:219-226

Ehlers, B. K., Olesen, J. M., and J. Ågren. 2002. Floral morphology and reproductive success in the orchid Epipactis helleborine: regional and local across-habitat variation. Plant Systematics and Evolution 236:19-32

Külheim, C., J. Ågren, and S. Jansson. 2002. Rapid regulation of light harvesting is crucial for plant fitness in the field. Science 297:91-93

Ehrlén, J., S. Käck, and J. Ågren. 2002. Pollen limitation, seed predation and scape length in Primula farinosaOikos 97:45-51

Ågren, J., and D. W. Schemske. 2000. Deceit pollination in Begonia. In: N. M. Nadkarni and N. T. Wheelwright (eds.), Monteverde: ecology and conservation of a tropical cloud forest. Oxford University Press, Oxford, pp. 279-281. 

Alexandersson, R., and J. Ågren. 2000. Genetic structure in the nonrewarding, bumblebee-pollinated orchid Calypso bulbosaHeredity 85:401-409

Hambäck, P. A., J. Ågren, and L. Ericson. 2000. Associational resistance: insect damage to purple loosestrife reduced in thickets of sweet gale. Ecology 81:1784-1794

Ågren, J., K. Danell, T. Elmqvist, L. Ericson, and J. Hjältén. 1999. Sexual dimorphism and biotic interactions. In: M. A. Geber, T. E. Dawson, and L. Delph (eds.), Gender and sexual dimorphism in flowering plants. Springer Verlag, Berlin, pp. 217-246. 

Le Corff, J., J. Ågren, and D. W. Schemske. 1998. Floral display, pollinator discrimination and female reproductive success in two monoecious Begoniaspecies. Ecology 79:1610-1619

Carlsson-Granér, U., T. Elmqvist, J. Ågren, H. Gardfjell, and P. Ingvarsson. 1998. Floral sex ratios, disease and seed set in dioecious Silene dioica. Journal of Ecology 86:79-91. 

Schemske, D. W., J. Ågren, and J. Le Corff. 1996. Deceit pollination in the monoecious, neotropical herb Begonia oaxacana (Begoniaceae). In: D. G. Lloyd and S. C. H. Barrett (eds.), Floral Biology: Studies in Floral Evolution in Animal-pollinated Plants. Chapman and Hall, New York, pp. 292-318. 

Alexandersson, R., and J. Ågren. 1996. Population size, pollinator visitation, and fruit production in the deceptive orchid Calypso bulbosa. Oecologia 107:533-540. 

Ågren, J., and L. Ericson. 1996. Population structure and morph-specific fitness differences in tristylous Lythrum salicaria. Evolution 50:126-139. 

Ågren, J. 1996. Population size, pollinator limitation and seed set in the self-incompatible herb Lythrum salicariaEcology 77:1779-1790

Schemske, D. W., and J. Ågren. 1995. Deceit pollination and selection on female flower size in Begonia involucrata: an experimental approach. Evolution 49:207-214. 

Ågren, J., and D. W. Schemske. 1995. Sex allocation in the monoecious herbBegonia semiovata. Evolution 49:121-130. 

Ågren, J., and M. F. Willson. 1994. Cost of seed production in the perennial herbsGeranium maculatum and G. sylvaticum: an experimental field study. Oikos 70:35-42. 

Ågren, J., and D. W. Schemske. 1994. Evolution of trichome number in a naturalized population of Brassica rapa. American Naturalist 143:1-13. 

Ågren, J., and D. W. Schemske. 1993. Outcrossing rate and inbreeding depression in two annual monoecious herbs, Begonia hirsuta and B. semiovata. Evolution 47:125-135. 

Ågren, J., and D. W. Schemske. 1993. The cost of defense against herbivores: an experimental study of trichome production in Brassica rapa. American Naturalist 141:338-350. 

Ågren, J., and M. F. Willson. 1992. Determinants of seed production in Geranium maculatum. Oecologia 92:177-182. 

Ågren, J., and D. W. Schemske. 1992. Artificial selection on trichome number inBrassica rapa. Theoretical and Applied Genetics 83:673-678. 

Ågren, J., and M. F. Willson. 1991. Gender variation and sexual differences in reproductive characters and seed production in gynodioecious Geranium maculatum. American Journal of Botany 78:470-480. 

Ågren, J., and D. W. Schemske. 1991. Pollination by deceit in a neotropical monoecious herb, Begonia involucrata. Biotropica 23:235-241. 

Ågren, J., and O. Zackrisson. 1990. Age and size structure of Pinus sylvestrispopulations on mires in central and northern Sweden. Journal of Ecology 78:1049-1062. 

Willson, M. F., and J. Ågren. 1989. Differential floral rewards and pollination by deceit in unisexual flowers. Oikos 55:23-29. 

Ågren, J. 1989. Seed size and number in Rubus chamaemorus: between habitat variation, and effects of defoliation and supplemental pollination. Journal of Ecology 77:1080-1092. 

Elmqvist, T., J. Ågren, and A. Tunlid. 1988. Sexual dimorphism and between-year variation in flowering, fruit set and pollinator behaviour in a boreal willow. Oikos 53:58-66. 

Ågren, J. 1988. Between-year variation in flowering and fruit set in frost-prone and frost-sheltered populations of dioecious Rubus chamaemorus. Oecologia 76:175-183. 

Ågren, J. 1988. Sexual differences in biomass and nutrient allocation in the dioecious Rubus chamaemorusEcology 69:962-973

Ågren J. 1987. Intersexual differences in phenology and damage by herbivores and pathogens in dioecious Rubus chamaemorus L. Oecologia 72:161-169. 

Ågren, J., T. Elmqvist, and A. Tunlid. 1986. Pollination by deceit, floral sex ratios, and seed set in dioecious Rubus chamaemorus L. Oecologia 70:332-338. 

Ågren, J., L. Isaksson, and O. Zackrisson. 1983. Natural age and size structure ofPinus sylvestris and Picea abies on a mire in the inland part of northern Sweden. Holarctic Ecology 6:228-237. 

Ågren, J. 1983. Dendroekologisk undersökning av Domarvägen mellan Arjeplog och Jokkmokk. Dendro-ecological investigation of the old "Judges'Trail" between Arjeplog and Jokkmokk, N. Sweden. Fornvännen 78:269-279.