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Publications

• Henke T, Pálsson S, Hemmer-Hansen J, Thorlacius M, Ólafsdóttir GÁ. 2025. The tale of the founder flounder: assessing the origin of a recently established fish in Icelandic waters. Hydrobiologia. doi: 10.1007/s10750-025-05838-w
• Finnsson H, Chambers C, Guðbergsson G. 2025. Invasive species management: The case of pink salmon in Iceland. Marine Policy 173. doi: 10.1016/j.marpol.2024.106539
• Garcia-Lozano C, Pueyo-Ros J, Canelles Q et al. 2025. Management Measures and Trends of Biological Invasions in Europe: A Survey-Based Assessment of Local Managers. Global change biology 31(1): e70028. doi: 10.1111/gcb.70028
• Solloway HAI, Micael J, Gíslason S. 2024. Marine litter as a vector for fouling species in Iceland. Ocean and Coastal Research 72: e24076. doi:10.1590/2675-2824072.23185 .
• Micael J, Gíslason S. 2024. Tides of change: monitoring NIS in Icelandic harbours. Journal of Coastal Conservation 28, 72. doi:10.1007/s11852-024-01072-z.
• Henke T, Nova A, Bárðarson H, Ólafsdóttir GÁ. 2024. Let’s talk aliens - Stakeholder perceptions of an alien species differ in time and space. Neobiota 93: 117–141. doi: 10.3897/neobiota.93.117200
• de Montety L, Egilsdóttir S, Láruson AJ, Micael J, Gíslason S. 2024 A transoceanic journey: Melanochlamys diomedea's first report in the North Atlantic. Journal of the Marine Biological Association of the United Kingdom 104, e59: 1–8. doi: 10.1017/S002531542400047X
• Malmquist HJ, Gunnarsson K, Sveinsson S, Gíslason D, Micael J, Gíslason S. 2024. Sindraskel (Ensis terranovensis) – nýr landnemi í sjó við Ísland. Náttúrufræðingurinn 94 (1–2): 126–136.
• Magnússon JT, Hawkins SJ, Gunnarsdóttir L, Svavarsson J, Gunnarsson K. 2024. Range extension of invasive Cancer irroratus and native Carcinus maenas polewards in the Ascophyllum-dominated intertidal zone in north-west Iceland. Journal of the Marine Biological Association of the United Kingdom; 104:e3. doi:10.1017/S0025315423000905
• Micael J, Sigurjónsdóttir SJ, Gíslason S. 2023. Marine aquarium trade: an open door for invasions in Iceland. Journal of Coastal Conservation 27: 4–9. doi:10.1007/s11852-023-00986-4
• Skóra ME, Guðbergsson G, Copp GH, Jones JI. 2023. Evidence of successful recruitment of non-native pink salmon Oncorhynchus gorbuscha in Iceland. Journal of Fish Biology. doi: 10.1111/jfb.15556
• Gunnarsson K, Sveinsson S, Gíslason D,  Malmquist HJ, Micael J, Gíslason S. 2023. Mollusc on the move; First record of the Newfoundland’s razor clam, Ensis terranovensis Vierna & Martínez-Lage, 2012 (Mollusca; Pharidae) outside its native range. BioInvasions Records 12(3):765–774. doi:10.3391/bir.2023.12.3.12
• Micael J, Ramos-Esplá A, Rodrigues P, Gíslason S. 2022. Recent spread of non-indigenous ascidians (Chordata: Tunicata) in Icelandic harbours. Marine Biology Research 18 (9-10): 566–576. doi: 10.1080/17451000.2023.2176882
• Kourantidou M, Verbrugge LNH, Haubrock PJ, Cuthbert RN, Angulo E, Ahonen I, Cleary M, Falk-Andersson, Lena Granhag J, Gíslason S, Kaiser B, Kosenius A-K, Lange H, Lehtiniemi M, Magnussen K, Navrud S, Nummi P, Oficialdegui FJ, Ramula S, Ryttäri T, Schmalensee M, Stefansson RA, Diagne C, Courchamp F. 2022. The economic costs, management and regulation of biological invasions in the Nordic countries. Journal of Environmental Management 324: 116374. doi: 10.1016/j.jenvman.2022.116374
• Micael J, Denisenko NV, Gíslason S, Guðmundsson G, Kukliński P, Rodrigues P. 2022. Diversity of Bryozoa in Iceland. Polar Biology 45:1391–1402. doi: 10.1007/s00300-022-03078-5
• Micael J, Rodrigues P, Ramos-Esplá A, Gíslason S. 2022. Establishment and proliferation under climate change: temperate tunicates in south-western Iceland. Marine and Freshwater Research 73(6): 803–811. doi: 10.1071/MF21351
• Micael J, Rodrigues P, and Gíslason S. 2021. Native vs. non-indigenous macroalgae in Iceland: The state of knowledge. Regional Studies in Marine Science 47: 101944.. doi: 10.1016/j.rsma.2021.101944
• Gíslason S, Pálsson S, Guls HD, Jónasson JP, Svavarsson J, and Halldórsson HP. 2021. Population dynamics of three brachyuran crab species (Decapoda) in Icelandic waters: impact of recent colonization of the Atlantic rock crab (Cancer irroratus). ICES Journal of Marine Science 78(2): 534–544. doi: 10.1093/icesjms/fsaa059
• Micael J, Rodrigues P, and Gíslason S. 2020. Rhizoclonium riparium (Roth) Harvey: A cryptogenic species with an invasive behaviour in Reyðarfjörður, Iceland. Nordic Journal of Botany 38(12): 1–5. doi: 10.1111/njb.02803
• Henke T, Patterson WP, and Ólafsdóttir GÁ. 2020. First record of niche overlap of native European plaice (Pleuronectes platessa) and non-indigenous European flounder (Platichthys flesus) on nursery grounds in Iceland.  Aquatic Invasions 15 (4:) 671–682. doi: 10.3391/ai.2020.15.4.08
• Ramos-Esplá A, Micael J, Halldórsson HP, and Gíslason S. 2020. Iceland: a laboratory for non-indigenous ascidians. BioInvasions Records 9 (3): 450-460. doi: 10.3391/bir.2020.9.3.01
• Micael J, Rodrigues P, Halldórsson HP, and Gíslason S. 2020. Distribution and abundance of the invasive tunicate Ciona intestinalis (Linnaeus, 1767) in Icelandic harbours. Regional Studies in Marine Science 34: 101039. doi: 10.1016/j.rsma.2020.101039
• Gíslason ÓS, Jónasson JP, Pálsson S, Svavarsson J, and Halldórsson HP. 2017. Population density and growth of the newly introduced Atlantic rock crab Cancer irroratus Say, 1817 (Decapoda, Brachyura) in Iceland: A four-year mark-recapture study. Marine Biology Research 13 (2), 198-209. doi: 10.1080/17451000.2016.1240875
  
• Mathiesen SS, Thyrring J, Hemmer-Hansen J, Berge J, Sukhotin A, Leopold P, et al. 2017. Genetic diversity and connectivity within Mytilus spp. in the subarctic and Arctic. Evol. Appl. 10, 39–55. doi: 10.1111/eva.12415
  
• Gunnarsson K, Nielsen R, Egilsdóttir S, Brodie J. 2016. A collections-based approach to the species and their distribution based on the bladed Bangiales (Rhodophyta) of Iceland. Botanica Marina 59: 223–229. doi: 10.1515/ bot-2016-0037
• Gunnarsson K, Thorarinsdóttir GG, and Gíslason ÓS. 2015. Framandi sjávarlífverur við Ísland. Náttúrufræðingurinn 85 (1-2) 4–14.
• Gíslason ÓS, Halldórsson HP, Pálsson MF, Pálsson S, Davíðsdóttir B, and Svavarsson J. 2014. Invasion of the Atlantic rock crab Cancer irroratus at high latitudes. Biological Invasions 16, 1865–1877. doi: 10.1007/s10530-013-0632-7
• Gíslason ÓS, Jónasson JP, Svavarsson J, and Halldórsson HP. 2013. Merkingar og þéttleikamat á grjótkrabba við Ísland. Náttúrufræðingurinn 83 (1-2) 39-48
• Gíslason ÓS, Pálsson S., Mckeown SN, Halldórsson HP, Shaw PW, and Svavarsson J. 2013. Genetic variation in a newly established population of the Atlantic rock crab Cancer irroratus in Iceland. Marine Ecology Progress Series 494: 219–230 doi: 10.3354/meps10537
• Gíslason ÓS, Halldórsson HP, Svavarsson J and Pálsson S. 2013. Nuclear mitochondrial DNA (numt) in the Atlantic rock crab Cancer irroratus (Say, 1817) (Decapoda, Cancridae). Crustaceana, 86 (5): 537–552 doi: 10.1163/15685403-00003191
• Gunnarsson K, Eydal A, Ólafsdóttir SR, and Örnólfsdóttir EB. 2011. Svifþörungarnir Mediopyxis helysia og Stephanopyxis turris; Nýjar viðbætur við svifið við Ísland. Hafrannsóknir 158. 42–47.
• Gunnarsson K, and Egilsdóttir S. 2010. Framandi tegundir botnþörunga í sjó við Ísland. Hafrannsóknir 152. 47–51.
• Ingólfsson A. 2008. The invasion of the intertidal canopy-forming alga Fucus serratus L. to south-western Iceland: Possible community effects. Estuarine and Coastal Shelf Science 77. 484–490.
• Ingólfsson A, Ólafsson ÓP, and Morritt, D. 2007. Reproduction and life-cycle of the beachflea (Orchestia gammarellus (Pallas) (Crustacea: Amphipoda) at thermal and non-thermal sites in the intertidal of Iceland: how important is temperature? Marine Biology 150. 1333–1343.
• Gunnarsson B,  Ásgeirsson ÞÁ, and Ingólfsson A. 2007. The rapid colonization by Crangon crangon (Linnaeus, 1758) (Eucarida, Caridea, Crangonidae) of Icelandic coastal waters. Crustaceana 80. 747–753.
• Thorarinsdóttir GG, Ólafsson MF, and Kristjánsson ÞÖ. 2007. Lostætur landnemi. Náttúrufræðingurinn 75(1). 34–40.
• Jóhannsson M, and Jónsson B. 2007. Flundra í íslenskum vatnakerfum. Sportveiðiblaðið 97. 1–2.
• Pálsson J. 2007. Sjaldgæfir fiskar á Íslandsmiðum 2006. Ægir 100 (6). 12–14.
• Coyer, J.A., Hoarau, G., Skage, M., Stam, W.T. og Olsen, J.L. 2006. Origin of Fucus serratus (Heterokontophyta; Fucaceae) populations in Iceland and the Faroese: a microsatellite-based assessment. European Journal of Phycology 41 (2). 235–246.
• Jónsson G, Pálsson J, ands Jóhannsson M. 2001. Ný fisktegund flundra Platichtys flesus (Linnaeus, 1758) veiðist á Íslandsmiðum. Náttúrufræðingurinn 70 (2–3). 83–89.
• Gunnarsson K, and Galan A. 1990. Beltaskipting þörunga í skjólsælum klettafjörum og breytingar sem verða við náttúrulegt
  brottnám sagþangs (Fucus serratus L.). Bls. 81–89 í: Brunnur lifandi vatns. Afmælisrit til heiðurs Pétri Mikkel Jónasssyni prófessor sjötugum 18. júní 1990 (ritstj. Guðmundur Eggertsson, Guðmundur F. Guðmundsson, Ragnheiður Þorláksdóttir & Svavar Sigmundsson). Háskóli Íslands, Háskólaútgáfan, Reykjavík.
• Ástþórsson ÓS. 1987. Records and life history of Praunus flexuosus (Crustacea: Mysidacea) in Icelandic waters. Journal of Plankton Research 9 (5). 955–964.
• Munda, I.M., 1979. Addition to the checklist of benthic marine algae from Iceland. Bot. Mar. 22, 459–463. http://dx.doi.org/10.1515/botm.1979.22.7.459.
• Munda, I.M., 1976. Some Aspects of the Benthic Algal Vegetation of the South Icelandic Coastal Area. Research Institute Neðri Ás, Hveragerði, Iceland. Bulletin, vol. 25, pp. 1–69.
• Sigurður Jónsson og Karl Gunnarsson. 1975. La présence de Codium fragile (Sur.) Hariot en Islande et son extension dans lʼAtlantique Nord. Nova Hedwigia 16. 725–732.
• Jónsson S, and Gunnarsson K. 1975. La présence de Codium fragile (Sur.) Hariot en Islande et son extension dans lʼAtlantique Nord. Nova Hedwigia 16. 725–732.
• Ingólfsson A. 1973. Ný fjörumarfló (Orchestia gammarella (Pallas)) fundin á Íslandi. Náttúrufræðingurinn 43 (3–4). 170–174.
• Caram, B., Jónsson, S., 1972. Nouvelle inventaire des algues marines de l’Islande. Acta Bot. Is. 1, 5–31.
• Munda, I.M., 1972. General features of the bentic algal zonation around the Icelandic coast. Acta Nat. Islandica 21, 1–34.
• Skúladóttir U. 1968. Ný humartegund fundin við Ísland. Náttúrufræðingurinn 38(2). 110–112.
• Jónsson S. 1967. Further Settlement of Marine Benthic Algae on the Rocky Shore of Surtsey. Surtsey Research Progress Report III, pp. 46–56.
• Óskarsson I. 1960. Nýjungar um íslensk lindýr. Náttúrufræðingurinn 30. 176–187.

Reports

• Þórðardóttir GB, and Guðbergsson G. 2024. Lax‐ og silungsveiði 2023 (Freshwater fisheries in 2023). HV 2024-27.
  
• ICES. 2022. Working Group on Introductions and Transfers of Marine Organisms (WGITMO). Cynthia McKenzie, Jane Behrens, April Blakeslee, Joao Canning-Clode, Paula Chainho, Gordon Copp, Amelia Curd, John Darling, Phil Davison, Bella Galil, Sindri Gíslason, Stephan Gollasch, Joanna Hegele-Drywa, Nicole Heibeck, Kimberly Howland, Cornelia Jaspers, Anders Jelmert, Kathe Jensen, Jenni Kakkonen, Francis Kerckhof, Maiju Lehtiniemi, Agnese Marchini, Rahmat Naddafi, Monika Normant-Saremba, Anna Occhipinti-Ambrogi, Sergej Olenin, Macarena Ros Celmente Nathalie Simard, Sander Smolders, Frederique Viard, Mariusz Zabrocki, Argyro Zenetos ICES Scientific Reports. 4:84. 209 bls. https://doi.org/10.17895/ices.pub.21558855
• Þórðardóttir GB, and Guðbergsson G. 2023. Lax‐ og silungsveiði 2022 (Freshwater fisheries in 2022). HV 2023-22.
• Þórðardóttir GB, and Guðbergsson G. 2021. Lax‐ og silungsveiði 2020 (Freshwater fisheries in 2020). HV 2020-35.
• Þórðardóttir GB, and Guðbergsson G. 2020. Lax‐ og silungsveiði 2019 (Freshwater fisheries in 2019). HV 2020-38.
• Ragnarsdóttir SB, and Metúsalemsson S. 2020. Framandi tegundir í straumvötnum, stöðuvötnum og strandsjó. Náttúrufræðistofnun. NÍ-20011.
• ICES. 2019. Working Group on Introductions and Transfers of Marine Organisms (WGITMO). Sarah Bailey, April Blakeslee, Lyndsay Brown, Katja Broeg, Farrah Chan, Joao Canning-Clode, Paula Chainho, Gordon Copp, Elizabeth Cottier-Cook, Amelia Curd, John Darling, Jean-Claude Dauvin, Phil Davison, Lisa Drake, Bella Galil, Sindri Gislason, Stephan Gollasch, Kimberly Howland, Anders Jelmert, Kathe Jensen, Jenni Kakkonen, Francis Kerckhof, Maiju Lehtiniemi, Daniel Minchin, Agnese Marchini, Rahmat Naddafi, Monika Normant-Saremba, Anna Occhipinti-Ambrogi, Sergej Olenin, Henn Ojaveer, Judith Pederson, Jean-Philippe Pezy, Aurore Raoux, Marc Rius, Paul Stebbing, Solvita Strake, Mario Tamburri, Carolyn Tepolt, Thomas Therriault, Lauri Urho, Frederique Viard, Argyro Zenetos. ICES Scientific Reports. 1:53. 27 pp. http://doi.org/10.17895/ices.pub.5569
• ICES. 2018. Report of the Working Group on North Atlantic Salmon (WGNAS), 4–13 April 2018, Woods Hole, MA, USA. ICES CM 2018/ACOM:21. 386 pp.
• Þórðardóttir GB, and Guðbergsson G. 2019. Lax‐ og silungsveiði 2017 (Freshwater fisheries in 2018). HV 2019-42.
• Þórðardóttir GB, and Guðbergsson G. 2018. Lax‐ og silungsveiði 2017 (Freshwater fisheries in 2017). HV 2018-35.

Theses

• Theresa Henke. 2025. The establishment of European flounder (Platichthys flesus) in Icelandic waters. Doktorsritgerð, Háskóli Íslands.
  
• Solloway HAI. 2023. Marine litter as a vector for fouling species in the Southwest, Northeast, and Westfjords of Iceland. MSc thesis, University of Akureyri. 126 p.
  
• Magnússon JT. 2022. Mobile predators on the Ascophyllum nodosum dominated shores of Breiðafjörður, Iceland. MSc thesis,  University of Iceland. 95 p.
• Iraola JA. 2019. Identification of invasive Ciona sp. species and its origin Along the Icelandic coast. BS thesis, University of Iceland. 18 p.
• Henke T. 2018. Ecological impact of the invasive European flounder (Platichthys flesus) on the native European plaice (Pleuronectes platessa) on nursery grounds in Iceland. MSc. thesis, University of Akureyri. 92 p.
• Gíslason ÓS. 2015. Invasion of the Atlantic rock crab (Cancer irroratus) in Icelandic waters. PhD thesis, University of Iceland. 160 p.
• Svavarsdóttir FR. 2014. Parasites of European flounder (Platichtys flesus L.) and Arctic Charr (Salvelinus alpinus L.) in Icelandic freshwater. BS thesis, University of Iceland. 31 p.
• Koberstein MJ. 2013. Expansion of the brown shrimp Crangon crangon L.onto juvenile plaice Pleuronectes platessa L. nursery habitat in the Westfjords of Iceland. MSc. thesis, University of Akureyri. 68 p.
• Hlinason ÁV. 2013. Lífshættir flundru (Platichthys flesus) á ósasvæði Hvítár í Borgarfirði. MSc. thesis. Agricultural University of Iceland. 90 p.
• O'Farrell DP. 2012. Range expansion of European flounder Platichthys flesus to Icelandic waters. A threat to native salmonids? MSc. thesis, University of Akureyri. 81 p.          
• Björnsson A. 2011. Tegundasamsetning botndýra á hörðum botni í höfnum á Suðvesturlandi. BS thesis, University of Iceland. 29 p.
• Puro H. 2010. Reproductive biology of a new invader, brown shrimp Crangon crangon (L), in Iceland. BS thesis, University of Iceland. 38 p.
• Guðmundsson SÖ. 2010. Population dynamics of the brown shrimp, Crangon crangon (L.) at Helguvík bay, Iceland. BS thesis, University of Iceland. 29 p.
• Gíslason ÓS. 2009. Grjótkrabbi (Cancer irroratus) við Ísland: uppruni og lirfuþroskun með samanburði við bogkrabba (Carcinus maenas) og trjónukrabba (Hyas araneus). MSc. thesis, University of Iceland. 66 p.

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