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Torbjørn Rage Paulsen's picture

Torbjørn Rage Paulsen

Researcher
  • E-mailTorbjorn.Paulsen@uib.no
  • Phone+47 55 58 44 54
  • Visitor Address
    Thormøhlensgate 55B
    Bergen
  • Postal Address
    Postboks 7803
    5020 Bergen

I am an evolutionary ecologist working with plant-animal interactions. In my research on the interactions between plants and their seed dispersers, I try to understand the stategies plants have evolved when useing animals for seed dispersal.

Paulsen, T. R., Stiller, S., Weber, K., Donath, C., Schreiband, G. and Jensen, K. H. 2018 A 90-day toxicity and genotoxicity study with high-purity phenylcapsaicin. Toxicology Research and Application Volum 2, 1-21.

Paulsen, T. R., Colville, L., Daws, M. I., Eliassen, S., Högstedt, G., Kranner, I., Thompson, K. and Vandvik, V. 2015 The crypsis hypothesis explained: a reply to Jayasuriya et al. (2015)Seed Science Research 25, 402-408.

Paulsen, T. R., G. Högstedt, K. Thompson, V. Vandvik and S. Eliassen. 2014. Conditions favouring hard seededness as a dispersal and predator escape strategy. Journal of Ecology 102: 1475–1484

Paulsen, T. R., L. Colville, I. Kranner, M. I. Daws, G. Högstedt, V. Vandvik, and K. Thompson. 2013. Physical dormancy in seeds: a game of hide and seek? New Phytologist 198:496-503. Highlighted in Science 8. March 2013, vol. 339, p. 1125.

Paulsen, T. R., O. Lindtjørn, N. R. Gjerdet, and G. Högstedt. 2006. Avian gut passage reduces seed exit costs in Sorbus aucuparia (Rosaceae) as measured by a diametral compression test. Functional Plant Biology 33:401-406.

Paulsen, T. R., and G. Högstedt. 2002. Passage through bird guts increases germination rate and seedling growth in Sorbus aucuparia. Functional Ecology 16:608-616.

Journal articles
  • Paulsen, Torbjørn Rage; Stiller, Sebastian; Weber, Klaus; Donath, Claudia; Schreiband, Gudrun; Jensen, Knut Helge. 2018. A 90-day toxicity and genotoxicity study with high-purity phenylcapsaicin. Toxicology Research and Application. 2: 1-21. doi: 10.1177/2397847318773060
  • Paulsen, Torbjørn Rage; Colville, Louise; Daws, Matthew I.; Eliassen, Sigrunn; Högstedt, Göran; Kranner, Ilse; Thompson, Ken; Vandvik, Vigdis. 2015. The crypsis hypothesis explained: A reply to Jayasuriya et al. (2015). Seed Science Research. 25: 402-408. doi: 10.1017/S0960258515000288
  • Paulsen, Torbjørn Rage; Högstedt, Göran; Ken, Thompson; Vandvik, Vigdis; Eliassen, Sigrunn. 2014. Conditions favouring hard seededness as a dispersal and predator escape strategy. Journal of Ecology. 102: 1475-1484. doi: 10.1111/1365-2745.12323
  • Paulsen, Torbjørn Rage; Högstedt, Göran; Thompson, Ken; Vandvik, Vigdis; Eliassen, Sigrunn. 2014. DUBLETT: Conditions favouring hard seededness as a dispersal and predator escape strategy. Journal of Ecology. 102: 1475-1484. doi: 10.3923/sscience.2015.76.80
  • Paulsen, Torbjørn Rage; Colville, Louise; Kranner, Ilse; Daws, Matthew I.; Högstedt, Göran; Vandvik, Vigdis; Thompson, Ken. 2013. Physical dormancy in seeds: a game of hide and seek? New Phytologist. 198: 496-503. doi: 10.1111/nph.12191
  • Paulsen, Torbjørn Rage; Lindtjørn, Ommund; Gjerdet, Nils Roar; Høgstedt, Gøran. 2006. Avian gut passage reduces seed exit costs in Sorbus aucuparia (Rosaceae) as measured by a diametral compression test. Functional Plant Biology. 33: 401-406.
  • Paulsen, Torbjørn Rage; Seldal, Tarald; Raae, Arnt Johan; Høgstedt, Gøran. 2005. Hvorfor er verden grønn? Hjorteviltet. 10-17.
  • Paulsen, Torbjørn Rage; Hellekjær, Glenn O. 1999. Seeing is Believing: CuSeeMe-Inexpensive Video-conferencing. Språk og språkundervisning. 4. 28-32.
Reports and theses
  • Paulsen, Torbjørn Rage. 2013. Do plants want to be eaten? Part one: No Part two: Yes. University of Bergen.
  • Paulsen, Torbjørn Rage; Hellekjær, Glenn O. 1999. Internet Video-Conferencing. Høgskolen i Østfold, Halden. 9 pages.
  • Paulsen, Torbjørn Rage. 1998. Bird-berry interaction : more than just seed dispersal? ; a study on the effect of ingestion of rowan (<EM>Sorbus aucuparia</EM>) seeds by thrushes (<EM>Turdus spp.</EM>) on seed weight, seedling emergence and first season growth. cand.scient.-oppgave. [Mangler utgivernavn]. 66 pages.

More information in national current research information system (CRIStin)

Seeds cannot germinate without water since water activates the biochemical prosesses needed for germinatian and growth. It is therefor a conandrum that many plants, more than 2000 species, have seeds that are waterproof. How can this be? This conandrum is the basis for the SmellySeeds project.

We explore the idea that water-impermeable seed coats evolved to prevent the generation and release of the volatile compounds that rodents use to detect buried seeds. The crypsis hypothesis implies that the evolution of water-impermeable seeds involves the two steps of sealing (reduced seed predation) and re-opening the seed coat (reduced costs of increased generation time). This novel duality can explain why water-impermeable seeds have evolved repeatedly, as well as the diversity of locally adapted release mechanisms seen today.