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Anna Siwertsson

Postdoktor
Department of Arctic and Marine Biology

Job description:

Post-doctoral research fellow in aquatic ecology




Research interests

I am a freshwater biologist with strong interests in ecological theory and evolution. My current research focus on food webs in lakes, especially the coupling of spatially separated compartments and the role of parasites in the ecosystem. I am also interested in the interactions between ecological and evolutionary processes, especially ecological speciation, evolution of morphological and ecological diversity, and the effects of intraspecific diversity on the ecosystem. The majority of my research is carried out in subarctic lakes, with a focus on European whitefish and Arctic charr populations.

Teaching

Freshwater Ecology (BIO-2503)

Students:

Marianne Simonsen, PhD (2012-2017): Polymorphism in Arctic charr

Jesper Kuhn, PhD (2012-2015): Parasite communities and food web structure

Kristin Johansen, Master (2014): Benthic invertebrate communities

Sigrid Skoglund, Master (2013): Trophic ecology and polymorphism in Arctic charr

Publications in CRIStin


  • Simonsen, Marianne; Siwertsson, Anna; Adams, Colin Ean; Amundsen, Per-Arne; Præbel, Kim; Knudsen, Rune. Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs. Ecology and Evolution 2017. ISSN 2045-7758.s doi: 10.1002/ece3.3224.

  • Soldánová, Miroslava; Georgieva, Simona; Roháčová, Jana; Knudsen, Rune; Kuhn, Jesper A.; Henriksen, Eirik Haugstvedt; Siwertsson, Anna; Shaw, Jenny C.; Kuris, Armand M.; Amundsen, Per-Arne; Scholz, Tomas; Lafferty, Kevin D.; Kostadinova, Aneta. Molecular analyses reveal high cryptic diversity of trematodes in a sub-Arctic lake. International Journal for Parasitology: Parasites and Wildlife 2017; Volum 47. ISSN 2213-2244.s 327 - 345.s doi: http://dx.doi.org/10.1016/j.ijpara.2016.12.008.

  • Frainer, André; Johansen, Kristin M. Sommerseth; Siwertsson, Anna; Mousavi, Seyed Ali; Brittain, John Edward; Klemetsen, Anders; Knudsen, Rune; Amundsen, Per-Arne. Variation in benthic invertebrate functional trait diversity and composition across depths and seasons in a subarctic lake. Fundamental and Applied Limnology 2016; Volum 188 (2). ISSN 1863-9135.s 103 - 112.s doi: 10.1127/fal/2016/0839.

  • Saltykova, Elena; Siwertsson, Anna; Knudsen, Rune. Parallel phenotypic evolution of skull-bone structures and head measurements of Arctic charr morphs in two subarctic lakes. Environmental Biology of Fishes 2016; Volum 100 (2). ISSN 0378-1909.s 137 - 148.s doi: 10.1007/s10641-016-0564-z.

  • Siwertsson, Anna; Refsnes, Birgitte; Frainer, André; Amundsen, Per-Arne; Knudsen, Rune. Divergence and parallelism of parasite infections in Arctic charr morphs from deep and shallow lake habitats. Hydrobiologia 2016; Volum 783. ISSN 0018-8158.s 131 - 143.s doi: 10.1007/s10750-015-2563-z.

  • Knudsen, Rune; Gjelland, Karl Øystein; Eloranta, Antti; Hayden, Brian; Siwertsson, Anna; Amundsen, Per-Arne; Klemetsen, Anders. A specialised cannibalistic Arctic charr morph in the piscivore guild of a subarctic lake. Hydrobiologia 2016; Volum 783. ISSN 0018-8158.s 65 - 78.s doi: 10.1007/s10750-015-2601-x.

  • Knudsen, Rune; Amundsen, Per-Arne; Eloranta, Antti; Hayden, Brian; Siwertsson, Anna; Klemetsen, Anders. Parallel evolution of profundal Arctic charr morphs in two contrasting fish communities. Hydrobiologia 2016; Volum 783. ISSN 0018-8158.s 239 - 248.s doi: 10.1007/s10750-016-2647-4.

  • Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Kuris, Armand M.; Lafferty, Kevin D.; Siwertsson, Anna; Amundsen, Per-Arne. Ontogenetic dynamics of infection with Diphyllobothrium spp. cestodes in sympatric Arctic charr Salvelinus alpinus (L.) and brown trout Salmo trutta L.. Hydrobiologia 2015; Volum 783. ISSN 0018-8158.s 37 - 46.s doi: 10.1007/s10750-015-2589-2.

  • Skoglund, Sigrid Østrem; Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Morphological divergence between three Arctic charr morphs - the significance of the deep-water environment. Ecology and Evolution 2015; Volum 5 (15). ISSN 2045-7758.s 3114 - 3129.s doi: 10.1002/ece3.1573.

  • Knudsen, Rune; Siwertsson, Anna; Adams, Colin Ean; Newton, Jason; Amundsen, Per-Arne. Similar patterns of individual niche use are revealed by different time-integrated trophic tracers (stable isotopes and parasites). Ecology of Freshwater Fish 2014; Volum 23 (2). ISSN 0906-6691.s 259 - 268.s doi: 10.1111/eff.12074.

  • Præbel, Kim; Westgaard, Jon-Ivar; Amundsen, Per-Arne; Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo K.; Fevolden, Svein-Erik. A diagnostic tool for efficient analysis of the population structure, hybridization and conservation status of European whitefish (Coregonus lavaretus (L.)) and vendace (C-albula (L.)). Advances in Limnology 2013; Volum 64. ISSN 0071-1128.s 247 - 255.s doi: 10.1127/1612-166X/2013/0064-0026.

  • Præbel, Kim; Knudsen, Rune; Siwertsson, Anna; Karhunen, Markku; Kahilainen, Kimmo K.; Ovaskainen, Otso; Østbye, Kjartan; Peruzzi, Stefano; Fevolden, Svein-Erik; Amundsen, Per-Arne. Ecological speciation in postglacial European whitefish: rapid adaptive radiations into the littoral, pelagic, and profundal lake habitats. (fulltekst) Ecology and Evolution 2013; Volum 3 (15). ISSN 2045-7758.s 4970 - 4986.s doi: 10.1002/ece3.867.

  • Siwertsson, Anna; Knudsen, Rune; Adams, Colin Ean; Præbel, Kim; Amundsen, Per-Arne. Parallel and non-parallel morphological divergence among foraging specialists in European whitefish (Coregonus lavaretus). Ecology and Evolution 2013; Volum 3 (6). ISSN 2045-7758.s 1590 - 1602.s doi: 10.1002/ece3.562.

  • Siwertsson, Anna; Knudsen, Rune; Præbel, Kim; Adams, Colin Ean; Newton, Jason; Amundsen, Per-Arne. Discrete foraging niches promote ecological, phenotypic, and genetic divergence in sympatric whitefish (Coregonus lavaretus). Evolutionary Ecology 2013; Volum 27 (3). ISSN 0269-7653.s 547 - 564.s doi: 10.1007/s10682-012-9607-x.

  • Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Temporal stability in gill raker numbers of subarctic European whitefi sh populations. Advances in Limnology 2012; Volum 63. ISSN 0071-1128.s 229 - 240.s doi: 10.1127/advlim/63/2012/229.

  • Knudsen, Rune; Siwertsson, Anna; Adams, Colin Ean; Garduño-Paz, Monica; Newton, Jason; Amundsen, Per-Arne. Temporal stability of niche use exposes sympatric Arctic charr to alternative selection pressures. Evolutionary Ecology 2011; Volum 25 (3). ISSN 0269-7653.s 589 - 604.s doi: 10.1007/s10682-010-9451-9.

  • Eloranta, Antti; Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Dietary plasticity of Arctic charr (Salvelinus alpinus) facilitates coexistence with competitively superior European whitefish (Coregonus lavaretus). Ecology of Freshwater Fish 2011; Volum 20 (4). ISSN 0906-6691.s 558 - 568.s doi: 10.1111/j.1600-0633.2011.00504.x.

  • Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo; Præbel, Kim; Primicerio, Raul; Amundsen, Per-Arne. Sympatric diversification as influenced by ecological opportunity and historical contingency in a young species lineage of whitefish. Evolutionary Ecology Research 2011; Volum 12 (8). ISSN 1522-0613.s 929 - 947.

  • Kahilainen, Kimmo; Siwertsson, Anna; Gjelland, Karl Øystein; Knudsen, Rune; Amundsen, Per-Arne; Bøhn, Thomas. The role of gill raker number variability in adaptive radiation of coregonid fish. Evolutionary Ecology 2011; Volum 25 (3). ISSN 0269-7653.s 573 - 588.s doi: 10.1007/s10682-010-9411-4.

  • Amundsen, Per-Arne; Siwertsson, Anna; Primicerio, Raul; Bøhn, Thomas. Long-term responses of zooplankton to invasion by a planktivorous fish in a subarctic watercourse. Freshwater Biology 2009; Volum 54. ISSN 0046-5070.s 24 - 34.s doi: 10.1111/j.1365-2427.2008.02088.x.

  • Knudsen, Rune; Refsnes, Birgitte; Siwertsson, Anna; Frainer, Andre Barbosa; Amundsen, Per-Arne. Parallelism in parasite infections in two polymorphic Arctic charr populations in subarctic Norway. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.

  • Amundsen, Per-Arne; Kuhn, Jesper Andreas; Siwertsson, Anna; Knudsen, Rune; Kristoffersen, Roar. Økologi og forvaltning av fiskevatn – Takvatnprosjektet og resultater fra undersøkelser i seks innsjøer i Hamarøy-området. Folkemøte 2015-06-05 - 2015-06-05 2015.

  • Simonsen, Marianne; Siwertsson, Anna; Amundsen, Per-Arne; Adams, Colin Ean; Knudsen, Rune. Lake factors promoting polymorphism in Arctic charr (Salvelinus alpinus). Open research day (fagdag) UiT 2015-11-19 - 2015-11-19 2015.

  • Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Kuhn, Jesper Andreas; Klemetsen, Anders; Kuris, Armand; Lafferty, Kevin; Shaw, Jenny. Towards a holistic view of a lake food web - the importance of including benthic habitats and parasites. Research open Day (instituttseminar) 2015-11-19 - 2015-11-19 2015.

  • Amundsen, Per-Arne; Smalås, Aslak; Knudsen, Rune; Kristoffersen, Roar; Siwertsson, Anna; Klemetsen, Anders. Takvatnprosjektet - Forskning og kultivering av en overbefolka røyeberstand. (fulltekst) 2015.

  • Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders; Kuhn, Jesper Andreas; Kuris, Armand; Lafferty, Kevin; Shaw, Jenny. Towards a holistic view of a lake food web - the importance of including benthic habitats and parasites. Aquatic Biodiversity and Ecosystems Conference - Evolution, interaction and global change 2015-08-30 - 2015-09-04 2015.

  • Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders; Kuhn, Jesper Andreas; Kuris, Armand; Lafferty, Kevin; Shaw, Jenny. Food web structure in a subarctic lake. Invited guest lecture 2015-05-07 - 2015-05-07 2015.

  • Henriksen, Eirik Haugstvedt; Knudsen, Rune; Kristoffersen, Roar; Kuris, Armand M; Lafferty, Kevin D.; Siwertsson, Anna; Amundsen, Per-Arne. Ontogenetic dynamics of Diphyllobothrium infections in sympatric Arctic charr and brown trout. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.

  • Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Structure of diet specialization in Arctic charr using a network approach. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.

  • Simonsen, Marianne; Adams, Colin Ean; Siwertsson, Anna; Amundsen, Per-Arne; Knudsen, Rune. Ontogenetic trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus) morphs. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.

  • Knudsen, Rune; Siwertsson, Anna; Eloranta, Antti; Frainer, Andre Barbosa; Amundsen, Per-Arne; Klemetsen, Anders. Evolutionary and ecosystem consequences of a piscivore profundal morph of Arctic charr. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.

  • Klemetsen, Anders; Amundsen, Per-Arne; Siwertsson, Anna; Eloranta, Antti; Hayden, Brian; Knudsen, Rune. Parallel evolution of profundal Arctic charr niches in two contrasting fish communities. The 8th International Charr Symposium 2015-06-15 - 2015-06-18 2015.

  • Knudsen, Rune; Siwertsson, Anna; Amundsen, Per-Arne; Præbel, Kim; Klemetsen, Anders. Incipient speciation and ecosystem dynamics in subarctic lakes. Invited guest lecture 2014-02-13 - 2014-02-13 2014.

  • Siwertsson, Anna; Knudsen, Rune; Kristoffersen, Roar; Klemetsen, Anders; Amundsen, Per-Arne. The role of parasites in food-web topology and dynamics of subarctic lakes – background and current status. Seminar at UC Santa Barbara 2014-02-03 - 2014-02-03 2014.

  • Siwertsson, Anna. Evolusjon og artsdannelse i nord-norske innsjøer. Rekruteringsdag ved BFE fakultetet 2014-10-06 - 2014-10-07 2014.

  • Knudsen, Rune; Siwertsson, Anna; Klemetsen, Anders; Kristoffersen, Roar; Amundsen, Per-Arne. The role of parasites in food-web of subarctic lakes. Invited guest lecture 2014-05-05 - 2014-05-05 2014.

  • Amundsen, Per-Arne; Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Bhat, Shripathi; Klemetsen, Anders. Ecological speciation in subarctic whitefish and Arctic charr. CEES Seminar 2013-04-10 - 2013-04-10 2013.

  • Simonsen, Marianne; Adams, Colin Ean; Amundsen, Per-Arne; Siwertsson, Anna; Knudsen, Rune. Trophic morphology and ontogenetic differences in three sympatric Arctic charr (Salvelinus alpinus) morphs in Lake Skogsfjordvatn. Research open day 2013-11-19 - 2013-11-19 2013.

  • Simonsen, Marianne; Skoglund, Sigrid Østrem; Adams, Colin Ean; Amundsen, Per-Arne; Siwertsson, Anna; Knudsen, Rune. Trophic morphology and ontogenetic differences in three sympatric Arctic charr (Salvelinus alpinus) morphs in Lake Skogsfjordvatn. Speciation 2013 2013-05-27 - 2013-05-29 2013.

  • Amundsen, Per-Arne; Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Bhat, Shripathi; Kahilainen, Kimmo K.. Incipient ecological speciation in subarctic whitefish. Workshop on patterns and processes of intraspecific divergence and their relevance to aquatic biological diversity 2013-02-25 - 2013-02-27 2013.

  • Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Amundsen, Per-Arne. Incipient speciation in subarctic Scandinavia. Gjesteforelesning 2013-10-04 - 2013-10-04 2013.

  • Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Bath, Shriphati; Klemetsen, Anders; Amundsen, Per-Arne. Incipient ecological speciation in northern salmonids. Foredrag 2012-02-02 - 2012-02-02 2012.

  • Siwertsson, Anna. Diversity along a speciation continuum - Ecology and morphology of northern European whitefish (Coregonus lavaretus). (fulltekst) 2012 ISBN 9788282660396.

  • Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne; Præbel, Kim; Fevolden, Svein-Erik. Diversity of whitefish populations in northern Fennoscandia. Research Open Day (instituttseminar) 2012-11-21 - 2012-11-21 2012.

  • Knudsen, Rune; Skoglund, Sigrid Østrem; Smalås, Aslak; Præbel, Kim; Siwertsson, Anna; Amundsen, Per-Arne. Early speciation into dark side of life. Instituttseminar 2012-11-21 - 2012-11-21 2012.

  • Siwertsson, Anna. Evolusjon og artsdannelse i nord-norske innsjøer. Rekruteringsdag ved BFE fakultetet 2012-10-18 - 2012-10-19 2012.

  • Østbye, Kjartan; Præbel, Kim; Knudsen, Rune; Siwertsson, Anna; Amundsen, Per-Arne. Adaptive niche proliferation of polymorphic whitefish along the Kautokeino riversystem in northern Norway. 11th International symposium on the biology and management of coregonid fishes 2011-09-26 - 2011-09-30 2011.

  • Siwertsson, Anna. Evolusjon og artsdannelse i nord-norske innsjøer. Rekruteringsdag på BFE fakultetet 2011-10-17 - 2011-10-18 2011.

  • Præbel, Kim; Westgaard, Jon-Ivar; Amundsen, Per-Arne; Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo K.; Fevolden, Svein-Erik. A diagnostic tool for efficient genetic analysis of population structure in coregonids. 11th International symposium on the biology and management of coregonid fishes 2011-09-26 - 2011-09-30 2011.

  • Præbel, Kim; Østbye, Kjartan; Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo K.; Fevolden, Svein-Erik; Amundsen, Per-Arne. Parallel post-glacial re-colonisation of European whitefish morphs in northern Fennoscandia. 11th International symposium on the biology and management of coregonid fishes 2011-09-26 - 2011-09-30 2011.

  • Knudsen, Rune; Siwertsson, Anna; Præbel, Kim; Amundsen, Per-Arne. Incipient speciation of whitefish and Arctic charr. Student exchange seminar 2011-08-25 - 2011.

  • Amundsen, Per-Arne; Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Klemetsen, Anders. Incipient ecological speciation in subarctic salmonids. Guest Lecture - UC Santa Barbara 2011-06-27 - 2011.

  • Amundsen, Per-Arne; Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Kahilainen, Kimmo K.; Klemetsen, Anders. Polymorphism and ecological speciation in freshwater fish. Guest Lecture- NOAA Fisheries 2011-04-08 - 2011.

  • Amundsen, Per-Arne; Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Kahilainen, Kimmo K.; Klemetsen, Anders. Polymorphism and ecological speciation in European whitefish and Arctic charr. Guest Lecture - Oregon State University 2011-03-29 - 2011.

  • Præbel, Kim; Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Incipient speciation through ecological divergence in subarctic European whitefish populations. EV-Seminars, IFM-Geomar 2011-02-16 - 2011-02-16 2011.

  • Eloranta, Antti; Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo K.; Jones, Roger I.; Præbel, Kim; Amundsen, Per-Arne. RESOURCE PARTITIONING BETWEEN ARCTIC CHARR, WHITEFISH AND GRAYLING ALONG ALTITUDE GRADIENT OF SUBARCTIC LAKES. ASLO MEETING 2010-06-06 - 2010-06-11 2010.

  • Siwertsson, Anna. Incipient ecological speciation in subarctic whitefish populations. Seminar at the University of Texas at Austin 2010-02-22 - 2010.

  • Siwertsson, Anna. Evolutionary consequences of niche subdivision - Niche partitioning beyond the limnetic-benthic dichotomy. Speciation workshop 2010-11-19 - 2010-11-20 2010.

  • Præbel, Kim; Siwertsson, Anna; Knudsen, Rune; Fevolden, Svein-Erik; Amundsen, Per-Arne. Incipient speciation through ecological divergence in subarctic whitefish populations. Seminar at CEES 2010-11-22 - 2010-11-22 2010.

  • Knudsen, Rune; Præbel, Kim; Siwertsson, Anna; Kahilainen, Kimmo K.; Fevolden, Svein-Erik; Amundsen, Per-Arne. Ongoing ecological speciation in Fennoscandian whitefish?. First European Conference on Speciation Research 2010-12-12 - 2010-12-15 2010.

  • Knudsen, Rune; Amundsen, Per-Arne; Siwertsson, Anna; Præbel, Kim. Resource polymorphism and incipient speciation in Arctic charr (Salvelinus alpinus) from a subarctic lake. Woorkshop in limnology/freshwater ecology 2010-05-05 - 2010-05-07 2010.

  • Knudsen, Rune; Siwertsson, Anna; Præbel, Kim; Amundsen, Per-Arne. Incipient speciation and adaptive radiation in fishes from northern Scandinavia. Seminar in fish polymorphism & ecology 2010-11-11 - 2010-11-12 2010.

  • Kahilainen, Kimmo K.; Siwertsson, Anna; Gjelland, Karl øystein; Knudsen, Rune; Bøhn, Thomas; Amundsen, Per-Arne. Significance of gill rakers in Coregonus radiation. Evolutionary Ecology of Fishes: Diversification, Adaptation and Speciation 2009-11-23 - 2009-11-25 2009.

  • Knudsen, Rune; Siwertsson, Anna; Primicerio, Raul; Amundsen, Per-Arne; Adams, Colin Ean; Klemetsen, Anders. High inter-individual temporal consitency of narrow niches - an early step in the speciation process?. Evolutionary Ecology of Fishes: Diversification, Adaptation and Speciation 2009-11-23 - 2009-11-25 2009.

  • Siwertsson, Anna; Knudsen, Rune; Kahilainen, Kimmo K.; Præbel, Kim; Amundsen, Per-Arne. Variable patterns of phenotypic diversification within whitefish (Coregounus lavaretus) populations in northern Scandinavia. Evolutionary Ecology of Fishes: Diversification, Adaptation and Speciation 2009-11-23 - 2009-11-25 2009.

  • Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Stability of Gill Raker Numbers through Time in Subarctic Whitefish (Coregonus lavaretus (L.))Polulations. Tenth International Symposium on the Biology and Management of Coregonid Fishes 2008-08-24 - 2008-08-29 2008.

  • Siwertsson, Anna; Knudsen, Rune; Amundsen, Per-Arne. Incipient ecological speciation in subarctic whitefish populations – a starting project. Graduate-meeting of the specialized section “Ecology” of the German Zoological Society. “The ecology of specialized individuals in populations: prerequisites – constraints – development – relevance” 2008-03-07 - 2008-03-09 2008.

  • Knudsen, Rune; Siwertsson, Anna; Amundsen, Per-Arne. Darwins fisker? Spennende evolusjon hos røye og sik. Ottar 2008; Volum 273 (5). ISSN 0030-6703.s 22 - 29.

  • Amundsen, Per-Arne; Gjelland, Karl øystein; Siwertsson, Anna; Lien, Cesilie; DalsbØ, laina h; Jensen, Hallvard. Invasjon av lagesild i Pasvikvassdraget. Ottar 2008; Volum 273 (5). ISSN 0030-6703.s 30 - 37.

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