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Dr Mads Thomsen

Contact

Department: School of Biological Sciences

Email: mads.thomsen@canterbury.ac.nz

Direct Dial: +64 3 3695208

Office: Julius von Haast 239

Languages: English, Danish

About
Research / Creative works
Supervision
Networks
Projects

Fields of Research

  • Climate changes in marine ecosystems
  • Meta-analysis and cross-ecosystem comparisons
  • Marine biodiversity in a changing world
  • Restoration of marine foundation species
  • Impact of marine invaders
  • Facilitation and mutualistic interactions
  • Eutrophication in estuaries

Researcher Summary

I am an ecologist that research environmental impacts on coastal plant and animal communities.  My research focuses on how human stressors, such as bio-invasions, pollution, and climate change, impact the structure, productivity and biodiversity of aquatic ecosystems.  I combine experiments, surveys, analysis of long-term dataset, modeling and meta-analysis, to test how patterns in biological communities are generated and maintained.  My research provides predictions on how coastal habitats will respond to human stressors and recommendations for conservation strategies needed to ameliorate their impacts.

Subject Area: Disciplines

  • Biology: Ecology, Evolution and Behaviour: Biodiversity/Conservation; Biogeography; Biosecurity/Biosafety; Ecology; Marine Ecology

Resources

  • MS Thomsen Google Scholar
  • My personal webpage

Research/Scholarly/Creative Works

  • Pullen M., Gerber D., Thomsen MS. and Flanagan SP. (2022) Seasonal Dynamics of Faunal Diversity and Population Ecology in an Estuarine Seagrass Bed. Estuaries and Coasts 45(8): 2578-2591. http://dx.doi.org/10.1007/s12237-022-01103-8. (Journal Articles)
  • Thomsen MS., Altieri AH., Angelini C., Bishop MJ., Bulleri F., Farhan R., Frühling VMM., Gribben PE., Harrison SB. and He Q. (2022) Heterogeneity within and among co-occurring foundation species increases biodiversity. Nature Communications 13(1) http://dx.doi.org/10.1038/s41467-022-28194-y. (Journal Articles)
  • Thomsen MS., Altieri AH., Angelini C., Bishop MJ., Bulleri F., Farhan R., Frühling VMM., Gribben PE., Harrison SB. and He Q. (2022) Publisher Correction: Heterogeneity within and among co-occurring foundation species increases biodiversity (Nature Communications, (2022), 13, 1, (581), 10.1038/s41467-022-28194-y). Nature Communications 13(1) http://dx.doi.org/10.1038/s41467-022-29347-9. (Journal Articles)
  • Thoral F., Montie S., Thomsen MS., Tait LW., Pinkerton MH. and Schiel DR. (2022) Unravelling seasonal trends in coastal marine heatwave metrics across global biogeographical realms. Scientific Reports 12(1) http://dx.doi.org/10.1038/s41598-022-11908-z. (Journal Articles)
  • Bass A., Wernberg T., Thomsen M. and Smale D. (2021) Another Decade of Marine Climate Change Experiments: Trends, Progress and Knowledge Gaps. Frontiers in Marine Science 8 http://dx.doi.org/10.3389/fmars.2021.714462. (Journal Articles)
  • Ren J., Chen J., Xu C., van de Koppel J., Thomsen MS., Qiu S., Cheng F., Song W., Liu QX. and Xu C. (2021) An invasive species erodes the performance of coastal wetland protected areas. Science Advances 7(42) http://dx.doi.org/10.1126/sciadv.abi8943. (Journal Articles)
  • Schiel DR., Gerrity S., Orchard S., Alestra T., Dunmore RA., Falconer T., Thomsen MS. and Tait LW. (2021) Cataclysmic Disturbances to an Intertidal Ecosystem: Loss of Ecological Infrastructure Slows Recovery of Biogenic Habitats and Diversity. Frontiers in Ecology and Evolution 9 http://dx.doi.org/10.3389/fevo.2021.767548. (Journal Articles)
  • Smith KE., Burrows MT., Hobday AJ., Gupta AS., Moore PJ., Thomsen M., Wernberg T. and Smale DA. (2021) Socioeconomic impacts of marine heatwaves: Global issues and opportunities. Science 374(6566) http://dx.doi.org/10.1126/science.abj3593. (Journal Articles)
  • Tait LW., Thoral F., Pinkerton MH., Thomsen MS. and Schiel DR. (2021) Loss of Giant Kelp, Macrocystis pyrifera, Driven by Marine Heatwaves and Exacerbated by Poor Water Clarity in New Zealand. Frontiers in Marine Science 8 http://dx.doi.org/10.3389/fmars.2021.721087. (Journal Articles)
  • Thomsen MS., Mondardini L., Thoral F., Gerber D., Montie S., South PM., Tait L., Orchard S., Alestra T. and Schiel DR. (2021) Cascading impacts of earthquakes and extreme heatwaves have destroyed populations of an iconic marine foundation species. Diversity and Distributions 27(12): 2369-2383. http://dx.doi.org/10.1111/ddi.13407. (Journal Articles)
  • Gribben PE., Poore AGB., Thomsen MS., Quesey P., Weschke E. and Wright JT. (2020) Habitat provided by native species facilitates higher abundances of an invader in its introduced compared to native range. Scientific Reports 10(1) http://dx.doi.org/10.1038/s41598-020-63429-2. (Journal Articles)
  • Montie S., Thomsen MS., Rack W. and Broady PA. (2020) Extreme summer marine heatwaves increase chlorophyll a in the Southern Ocean. Antarctic Science 32(6): 508-509. http://dx.doi.org/10.1017/S0954102020000401. (Journal Articles)
  • Salinger MJ., Diamond HJ., Behrens E., Fernandez D., Fitzharris BB., Herold N., Johnstone P., Kerckhoffs H., Mullan AB. and Parker AK. (2020) Unparalleled coupled ocean-atmosphere summer heatwaves in the New Zealand region: drivers, mechanisms and impacts. Climatic Change 162(2): 485-506. http://dx.doi.org/10.1007/s10584-020-02730-5. (Journal Articles)
  • Sen Gupta A., Thomsen M., Benthuysen JA., Hobday AJ., Oliver E., Alexander LV., Burrows MT., Donat MG., Feng M. and Holbrook NJ. (2020) Drivers and impacts of the most extreme marine heatwaves events. Scientific Reports 10(1) http://dx.doi.org/10.1038/s41598-020-75445-3. (Journal Articles)
  • Solgaard Thomsen M. (2020) Indiscriminate data aggregation in ecological meta-analysis underestimates impacts of invasive species. Nature Ecology and Evolution 4(3): 312-314. http://dx.doi.org/10.1038/s41559-020-1117-6. (Journal Articles)
  • Staehr PA., Jakobsen HH., Hansen JLS., Andersen P., Christensen J., Göke C., Thomsen MS. and Stebbing PD. (2020) Trends in records and contribution of non-indigenous and cryptogenic species to marine communities in danish waters: Potential indicators for assessing impact. Aquatic Invasions 15(2): 217-244. http://dx.doi.org/10.3391/AI.2020.15.2.02. (Journal Articles)
  • Thomsen MS., Metcalfe I., Siciliano A., South PM., Gerrity S., Alestra T. and Schiel DR. (2020) Earthquake-driven destruction of an intertidal habitat cascade. Aquatic Botany 164 http://dx.doi.org/10.1016/j.aquabot.2020.103217. (Journal Articles)
  • Vieira R., Martin A., Engelen AH., Thomsen MS. and Arenas F. (2020) Interactive effects of co-occurring anthropogenic stressors on the seagrass, Zostera noltei. Ecological Indicators 109 http://dx.doi.org/10.1016/j.ecolind.2019.105780. (Journal Articles)
  • Wernberg T., Couraudon-Réale M., Tuya F. and Thomsen M. (2020) Disturbance intensity, disturbance extent and ocean climate modulate kelp forest understory communities. Marine Ecology Progress Series 651: 57-69. http://dx.doi.org/10.3354/meps13443. (Journal Articles)
  • Gribben PE., Angelini C., Altieri AH., Bishop MJ., Thomsen MS. and Bulleri F. (2019) Facilitation cascades in marine ecosystems: A synthesis and future directions. Oceanography and Marine Biology: 127-168. (Chapters)
  • Oliver ECJ., Burrows MT., Donat MG., Sen Gupta A., Alexander LV., Perkins-Kirkpatrick SE., Benthuysen JA., Hobday AJ., Holbrook NJ. and Moore PJ. (2019) Projected Marine Heatwaves in the 21st Century and the Potential for Ecological Impact. Frontiers in Marine Science 6 http://dx.doi.org/10.3389/fmars.2019.00734. (Journal Articles)
  • Schiel DR., Alestra T., Gerrity S., Orchard S., Dunmore R., Pirker J., Lilley S., Tait L., Hickford M. and Thomsen M. (2019) The Kaikōura earthquake in southern New Zealand: Loss of connectivity of marine communities and the necessity of a cross-ecosystem perspective. Aquatic Conservation: Marine and Freshwater Ecosystems 29(9): 1520-1534. http://dx.doi.org/10.1002/aqc.3122. (Journal Articles)
  • Siciliano A., Schiel DR. and Thomsen MS. (2019) Effects of local anthropogenic stressors on a habitat cascade in an estuarine seagrass system. Marine and Freshwater Research 70(8): 1129-1142. http://dx.doi.org/10.1071/MF18414. (Journal Articles)
  • Smale DA., Wernberg T., Oliver ECJ., Thomsen M., Harvey BP., Straub SC., Burrows MT., Alexander LV., Benthuysen JA. and Donat MG. (2019) Marine heatwaves threaten global biodiversity and the provision of ecosystem services. Nature Climate Change 9(4): 306-312. http://dx.doi.org/10.1038/s41558-019-0412-1. (Journal Articles)
  • Straub SC., Wernberg T., Thomsen MS., Moore PJ., Burrows MT., Harvey BP. and Smale DA. (2019) Resistance, Extinction, and Everything in Between – The Diverse Responses of Seaweeds to Marine Heatwaves. Frontiers in Marine Science 6 http://dx.doi.org/10.3389/fmars.2019.00763. (Journal Articles)
  • Thomsen MS. and South PM. (2019) Communities and attachment networks associated with primary, secondary and alternative foundation species; A case study of stressed and disturbed stands of southern bull kelp. Diversity 11(4) http://dx.doi.org/10.3390/d11040056. (Journal Articles)
  • Thomsen MS., Mondardini L., Alestra T., Gerrity S., Tait L., South PM., Lilley SA. and Schiel DR. (2019) Local Extinction of bull kelp (Durvillaea spp.) due to a marine heatwave. Frontiers in Marine Science 6(MAR) http://dx.doi.org/10.3389/fmars.2019.00084. (Journal Articles)
  • Thomsen MS., Ramus AP., Long ZT. and Silliman BR. (2019) A seaweed increases ecosystem multifunctionality when invading bare mudflats. Biological Invasions 21(1): 27-36. http://dx.doi.org/10.1007/s10530-018-1823-z. (Journal Articles)
  • Thomsen MS., Ramus AP., Long ZT. and Silliman BR. (2019) A seaweed increases ecosystem multifunctionality when invading bare mudflats. Biological Invasions 21(1): 27-36. http://dx.doi.org/10.1007/s10530-018-1823-z. (Journal Articles)
  • Wernberg T., Coleman MA., Babcock RC., Bell SY., Bolton JJ., Connell SD., Hurd CL., Johnson CR., Marzinelli EM. and Shears NT. (2019) Biology and ecology of the globally significant kelp Ecklonia Radiata. Oceanography and Marine Biology: 265-324. (Chapters)
  • Hobday AJ., Oliver ECJ., Gupta AS., Benthuysen JA., Burrows MT., Donat MG., Holbrook NJ., Moore PJ., Thomsen MS. and Wernberg T. (2018) Categorizing and naming marine heatwaves. Oceanography 31(2 Special Issue): 162-173. http://dx.doi.org/10.5670/oceanog.2018.205. (Journal Articles)
  • Martínez B., Radford B., Thomsen MS., Connell SD., Carreño F., Bradshaw CJA., Fordham DA., Russell BD., Gurgel CFD. and Wernberg T. (2018) Distribution models predict large contractions of habitat-forming seaweeds in response to ocean warming. Diversity and Distributions 24(10): 1350-1366. http://dx.doi.org/10.1111/ddi.12767. (Journal Articles)
  • Thomsen MS., Alestra T., Brockerhoff D., Lilley SA., South PM. and Schiel DR. (2018) Modified kelp seasonality and invertebrate diversity where an invasive kelp co-occurs with native mussels. Marine Biology 165 173: 14. http://dx.doi.org/10.1007/s00227-018-3431-y. (Journal Articles)
  • Thomsen MS., Alestra T., Brockerhoff D., Lilley SA., South PM. and Schiel DR. (2018) Modified kelp seasonality and invertebrate diversity where an invasive kelp co-occurs with native mussels. Marine Biology 165(10) http://dx.doi.org/10.1007/s00227-018-3431-y. (Journal Articles)
  • Thomsen MS., Altieri AH., Angelini C., Bishop MJ., Gribben PE., Lear G., He Q., Schiel DR., Silliman BR. and South PM. (2018) Secondary foundation species enhance biodiversity. Nature Ecology and Evolution 2(4): 634-639. http://dx.doi.org/10.1038/s41559-018-0487-5. (Journal Articles)
  • Wernberg T., Coleman MA., Bennett S., Thomsen MS., Tuya F. and Kelaher BP. (2018) Genetic diversity and kelp forest vulnerability to climatic stress. Scientific Reports 8(1) http://dx.doi.org/10.1038/s41598-018-20009-9. (Journal Articles)
  • Alestra T., Thomsen MS., South PM. and Schiel DR. (2017) Cross-trophic level effects of the introduced kelp Undaria pinnatifida on mussel reef benthic fauna. New Zealand Marine Sciences Society Conference. (Oral Presentations)
  • Ramus AP., Silliman BR., Thomsen MS. and Long ZT. (2017) An invasive foundation species enhances multifunctionality in a coastal ecosystem. Proceedings of the National Academy of Sciences 114(32): 8580-8585. http://dx.doi.org/10.1073/pnas.1700353114. (Journal Articles)
  • South PM., Floerl O., Forrest BM. and Thomsen MS. (2017) A review of three decades of research on the invasive kelp Undaria pinnatifida in Australasia: An assessment of its success, impacts and status as one of the world's worst invaders. Marine Environmental Research 131: 243-257. http://dx.doi.org/10.1016/j.marenvres.2017.09.015. (Journal Articles)
  • Alestra T., Thomsen MS. and Schiel DR. (2016) Succession and recovery of hosts and epiphytes following experimental disturbances to an intertidal assemblage. New Zealand Ecological Society Conference. (Oral Presentations)
  • Alestra T., Thomsen MS., South PM. and Schiel DR. (2016) Role of the invasive kelp Undaria pinnatifida in intertidal-subtidal interaction webs: influence on mussel consumption and recruitment. Pisa, Italy: 11th International Temperate Reefs Symposium. (Oral Presentations)
  • South PM. and Thomsen MS. (2016) The ecological role of invading Undaria pinnatifida: an experimental test of the driver–passenger models. Marine Biology 163(8) http://dx.doi.org/10.1007/s00227-016-2948-1. (Journal Articles)
  • South PM., Lilley SA., Tait LW., Alestra T., Hickford MJH., Thomsen MS. and Schiel DR. (2016) Transient effects of an invasive kelp on the community structure and primary productivity of an intertidal assemblage. Marine and Freshwater Research 67(1): 103-112. http://dx.doi.org/10.1071/MF14211. (Journal Articles)
  • Straub SC., Thomsen MS. and Wernberg T. (2016) The dynamic biogeography of the anthropocene: the speed of recent range shifts in seaweeds. In Hu ZM; Fraser C (Ed.), Seaweed Phylogeography: Adaptation and Evolution of Seaweeds under Environmental Change: 63-93. Netherlands: Springer. (Chapters)
  • Thomsen MS., Hildebrand T., South PM., Foster T., Siciliano A., Oldach E. and Schiel DR. (2016) A sixth-level habitat cascade increases biodiversity in an intertidal estuary. Ecology and Evolution 6(22): 8291-8303. http://dx.doi.org/10.1002/ece3.2499. (Journal Articles)
  • Thomsen MS., Metcalfe I., South P. and Schiel DR. (2016) A host-specific habitat former controls biodiversity across ecological transitions in a rocky intertidal facilitation cascade. Marine and Freshwater Research 67(1): 144-152. http://dx.doi.org/10.1071/MF14152. (Journal Articles)
  • Thomsen MS., Wernberg T., South PM. and Schiel DR. (2016) To include or not to include (the invader in community analyses)? That is the question. Biological Invasions 18(6): 1515-1521. http://dx.doi.org/10.1007/s10530-016-1102-9. (Journal Articles)
  • Thomsen MS., Wernberg T., South PM. and Schiel DR. (2016) Non-native seaweeds drive changes in marine coastal communities around the world. In Hu ZM; Fraser C (Ed.), Seaweed Phylogeography: Adaptation and Evolution of Seaweeds under Environmental Change: 147-185. Netherlands: Springer. http://dx.doi.org/10.1007/978-94-017-7534-2_6. (Chapters)
  • Thomsen MS., Wernberg T., Staehr T. and Schiel D. (2016) Ecological interactions between marine plant and alien species. In Olafsson E (Ed.), Marine Macrophytes as Foundation Species: 226-258. Boca Raton: CRC Press. (Chapters)
  • Thornber CS., Jones E. and Thomsen MS. (2016) Epibiont-Marine Macrophyte Assemblages. In Ólafsson E (Ed.), Marine Macrophytes as Foundation Species: 43-75. New York: CRC Press. (Chapters)
  • Wernberg T., Arenas F., Olabarria C., Thomsen MS. and Mohring MB. (2016) Threats to Ecosystem Engineering Macrophytes: Climate Change. In Olafsson E (Ed.), Marine Macrophytes as Foundation Species: 201-225. New York: CRC Press. (Chapters)
  • Wernberg T., Bennett S., Babcock RC., De Bettignies T., Cure K., Depczynski M., Dufois F., Fromont J., Fulton CJ. and Hovey RK. (2016) Climate-driven regime shift of a temperate marine ecosystem. Science 353(6295): 169-172. http://dx.doi.org/10.1126/science.aad8745. (Journal Articles)
  • Tait LW., South PM., Lilley SA., Thomsen MS. and Schiel DR. (2015) Assemblage and understory carbon production of native and invasive canopy-forming macroalgae. Journal of Experimental Marine Biology and Ecology 469: 10-17. http://dx.doi.org/10.1016/j.jembe.2015.04.007. (Journal Articles)
  • Thomsen MS. and Wernberg T. (2015) The devil in the detail: harmful seaweeds are not harmful to everyone. Global Change Biology 21(4): 1381-1382. http://dx.doi.org/10.1111/gcb.12772. (Journal Articles)
  • Thomsen MS., Wernberg T. and Schiel D. (2015) Invasions by non-indigenous species. Marine Ecosystems: Human Impacts on Biodiversity, Functioning and Services: 274-332. http://dx.doi.org/10.1017/CBO9781139794763.010. (Chapters)
  • Thomsen MS., Wernberg T. and Schiel DR. (2015) Invasions by non-indigenous species. In Crowe T; Frid CLJ (Ed.), Marine Ecosystems: Human Impacts on Biodiversity, Functioning and Services: 274-332. Cambridge: Cambridge University Press. http://dx.doi.org/10.1017/CBO9781139794763.010. (Chapters)
  • Thyrring J., Thomsen MS., Brunbjerg AK. and Wernberg T. (2015) Diversity and abundance of epibiota on invasive and native estuarine gastropods depend on substratum and salinity. Marine and Freshwater Research 66(12): 1191-1200. http://dx.doi.org/10.1071/MF14311. (Journal Articles)
  • Gurgel CFD., Wernberg T., Thomsen MS., Russell BD., Adam P., Waters MJ. and Connell SD. (2014) Shared patterns of species turnover between seaweeds and seed plants break down at increasing distances from the sea. Ecology and Evolution 4: 27-34. http://dx.doi.org/10.1002/ece3.893. (Journal Articles)
  • Thomsen MS. and Wernberg T. (2014) On the generality of cascading habitat-formation. Proceedings of the Royal Society B 281(1777) 20131994 http://dx.doi.org/10.1098/rspb.2013.1994. (Journal Articles)
  • Thomsen MS., Byers JE., Schiel DR., Bruno JF., Olden JD., Wernberg T. and Silliman BR. (2014) Impacts of marine invaders on biodiversity depend on trophic position and functional similarity. Marine Ecology Progress Series 495: 39-47. http://dx.doi.org/10.3354/meps10566. (Journal Articles)
  • Thomsen MS., Wernberg T., Olden JD., Byers JE., Bruno JF., Silliman BR. and Schiel DR. (2014) Forty years of experiments on aquatic invasive species: are study biases limiting our understanding of impacts? Neobiota 22: 1-22. http://dx.doi.org/10.3897/neobiota.22.6224. (Journal Articles)
  • Thomsen MS., Wernberg T., Schiel DR., Byers JE., Olden JD. and Silliman BR. (2014) Experimental evidence for invasion impact in aquatic systems - including temperate reefs. Perth, Australia: 10th International Temperate Reefs Symposium (ITRS), 12-17 Jan 2014. (Conference Contributions - Other)
  • Wernberg T., Russell BD., Bradshaw CJA., Gurgel CFD., Thomsen MS., Poloczanska ES. and Connell SD. (2014) Misconceptions about analyses of Australian seaweed collections. Phycologia 53(3): 215-220. http://dx.doi.org/10.2216/13-197.1. (Journal Articles)
  • Wernberg T., Russell BD., Thomsen MS. and Connell SD. (2014) Marine biodiversity and climate change. In Freedman B (Ed.), Global Environmental Change, Handbook of Global Environmental Pollution: 181-187. Berlin Heidelberg: Springer-Verlag. http://dx.doi.org/10.1007/978-94-007-5784-4_80. (Chapters)
  • Hildebrand T., Thomsen M. and Schiel DR. (2013) Impact of epibiota and parasites on life history parameters of cockles in a recovering estuary. Hamilton, New Zealand: Joint conference of New Zealand Marine Sciences Society, New Zealand Freshwater Sciences Society and The Australian Society for Fish Biology, 19-23 Aug 2013. (Conference Contributions - Other)
  • Nejrup LB., Staehr PA. and Thomsen MS. (2013) Temperature- and light dependent growth and metabolism of the invasive red algae Gracilaria vermiculophylla (Ohmi) Pappenfuss - a comparative study with two native macroalgae. European Journal of Phycology 48(3): 295-308. http://dx.doi.org/10.1080/09670262.2013.830778. (Journal Articles)
  • Thomsen MS., South P. and Schiel DR. (2013) Facilitation cascades increase biodiversity in a New Zealand estuary. Auckland, New Zealand: New Zealand Ecological Society, 1-1 Nov 2013. (Conference Contributions - Other)
  • Thomsen MS., Staehr PA., Nejrup LB. and Schiel DR. (2013) Effects of the invasive macroalga Gracilaria vermiculophylla on two co-occurring foundation species and associated invertebrates. Aquatic Invasions 8(2): 133-145. http://dx.doi.org/10.3391/ai.2013.8.2.02. (Journal Articles)
  • Thyrring J., Thomsen MS. and Wernberg T. (2013) Large-scale facilitation of a sessile community by an invasive habitat-forming snail. Helgoland Marine Research 67(4): 789-794. http://dx.doi.org/10.1007/s10152-013-0363-2. (Journal Articles)
  • Wernberg T., Smale DA., Tuya F., Thomsen MS., Langlois TJ., De Bettignies T., Bennett S. and Rousseaux CS. (2013) An extreme climatic event alters marine ecosystem structure in a global biodiversity hotspot. Nature Climate Change 3: 78-82. http://dx.doi.org/10.1038/nclimate1627. (Journal Articles)
  • Wernberg T., Thomsen MS. and Kotta J. (2013) Complex plant-herbivore-predator interactions in a brackish water seaweed habitat. Journal of Experimental Marine Biology and Ecology 449: 51-56. http://dx.doi.org/10.1016/j.jembe.2013.08.014. (Journal Articles)
  • Wernberg T., Thomsen MS., Connell SD., Russell BD., Waters JM., Zuccarello GC., Kraft GT., Sanderson C., West JA. and Gurgel CFD. (2013) The footprint of continental-scale ocean currents on the biogeography of seaweeds. PLoS ONE 8(11) e80168 http://dx.doi.org/10.1371/journal.pone.0080168. (Journal Articles)
  • De Bettignies T., Thomsen MS. and Wernberg T. (2012) Wounded kelps: patterns and susceptibility to breakage. Aquatic Biology 17: 223-233. http://dx.doi.org/10.3354/ab00471. (Journal Articles)
  • Hoeffle H., Wernberg T., Thomsen MS. and Holmer M. (2012) Drift algae, an invasive snail and elevated temperature reduces the ecological performance of a warm-temperate seagrass, through additive effects. Marine Ecology Progress Series 450: 67-80. http://dx.doi.org/10.3354/meps09552. (Journal Articles)
  • McCoy MW., Altieri AH., Holdredge C., Thomsen MS. and Silliman BR. (2012) Facilitation. In Hastings A; Gross LJ (Ed.), Encyclopedia of theoretical ecology: 276-280. London: University of California Press. (Chapters)
  • Ramsey EIII., Rangoonwala A., Thomsen MS. and Schwarzschild A. (2012) Flat-plate techniques for measuring reflectance of macro-algae (Ulva curvata). International Journal of Remote Sensing 33: 3147-3155. http://dx.doi.org/10.1080/01431161.2011.633124. (Journal Articles)
  • Ramsey EIII., Rangoonwala A., Thomsen MS. and Schwarzschild A. (2012) Spectral definition of the macro-algae Ulva curvata in the back-barrier bays of the Eastern Shore of Virginia, USA. International Journal of Remote Sensing 33: 586-603. http://dx.doi.org/10.1080/01431161.2010.543436. (Journal Articles)
  • Thomsen MS., de Bettignies T., Wernberg T., Holmer M. and Debeuf B. (2012) Harmful algae are not harmful to everyone. Harmful Alga 16: 74-80. http://dx.doi.org/10.1016/j.hal.2012.01.005. (Journal Articles)
  • Thomsen MS., Wernberg T., Engelen AH., Tuya F., Vanderklift MA., Holmer M., McGlathery KJ., Arenas F., Kotta J. and Silliman BR. (2012) A meta-analysis of seaweeds impact on seagrasses: generalities and knowledge gaps. PLoS One 7 e28595: 1-8. http://dx.doi.org/10.1371/journal.pone.0028595. (Journal Articles)
  • Wernberg T., Smale DA. and Thomsen MS. (2012) A decade of climate change experiments on marine organisms: procedures, patterns and problems. Global Ecology Biology 18(5): 1491-1498. http://dx.doi.org/10.1111/j.1365-2486.2012.02656.x. (Journal Articles)
  • Hoeffle H., Thomsen MS. and Holmer M. (2011) High mortality of Zostera marina under high temperature regimes but minor effects of the invasive macroalgae Gracilaria vermiculophylla. Estuarine Coastal and Shelf Science 92: 35-46. http://dx.doi.org/10.1016/j.ecss.2010.12.017. (Journal Articles)
  • Holmer M., Wirachwong P. and Thomsen MS. (2011) Negative effects of stress-resistant drift algae and high temperature on a small ephemeral seagrass species. Marine Biology 158: 297-309. http://dx.doi.org/10.1007/s00227-010-1559-5. (Journal Articles)
  • Thomsen MS., Ferdie M. and McGlathery KJ. (2011) Tube-forming polychaetes enhance invertebrate diversity and abundance in sandy sediments of Mozambique, Africa. African Journal of Marine Science 33: 327-332. http://dx.doi.org/10.2989/1814232X.2011.600433. (Journal Articles)
  • Thomsen MS., Wernberg T., Olden J., Griffin J. and Silliman BR. (2011) A general framework to address context-dependent invasion impact. Journal of Experimental Marine Biology and Ecology 400: 322-327. http://dx.doi.org/10.1016/j.jembe.2011.02.033. (Journal Articles)
  • Thomsen., S M., Olden., J., Wernberg., T., Griffin., J., Silliman. and B. (2011) A broad framework to organize and compare invasion impacts. Environmental Research 111: 899-908. http://dx.doi.org/10.1016/j.envres.2011.05.024. (Journal Articles)
  • Tuya F., Vanderklift MA., Wernberg T. and Thomsen MS. (2011) Gradients in the number of species at reef-seagrass ecotones explained by gradients in abundance. PLoS One 6 e20190 http://dx.doi.org/10.1371/journal.pone.0020190. (Journal Articles)
  • Tuya F., Wernberg T. and Thomsen MS. (2011) The relative influence of local to regional drivers of variation in reef fishes. Journal of Fish Biology 79: 217-234. http://dx.doi.org/10.1111/j.1095-8649.2011.03015.x. (Journal Articles)
  • Wernberg T., Russell B., Thomsen MS., Gurgel CFD., Bradshaw CJA., Poloczanska ES. and Connell SD. (2011) Seaweed communities in retreat from ocean warming. Current Biology 21: 1828-1832. http://dx.doi.org/10.1016/j.cub.2011.09.028. (Journal Articles)
  • Wernberg T., Thomsen MS., Tuya F. and Kendrick G. (2011) Biogenic habitat structure on reefs change along a latitudinal gradient in temperate ocean climate. Journal of Experimental Marine Biology and Ecology 400: 264-271. http://dx.doi.org/10.1016/j.jembe.2011.02.017. (Journal Articles)
  • Thomsen MS. (2010) Experimental evidence for positive effects of invasive seaweed on native invertebrates via habitat-formation in a seagrass bed. Aquatic Invasions 5: 1-6. http://dx.doi.org/10.3391/ai.2010.5.4.02. (Journal Articles)
  • Thomsen MS., Altieri A., Wernberg T., Tuya F., Gulbransen D., McGlathery K., Holmer M. and Silliman BR. (2010) Habitat cascades: the conceptual context and global relevance of facilitation cascades via habitat formation and modification. Integrative and Comparative Biology 50: 158-175. http://dx.doi.org/10.1093/icb/icq042. (Journal Articles)
  • Thomsen MS., Wernberg T., Tuya F. and Silliman BR. (2010) Ecological performance and possible origin of a ubiquitous but under-studied gastropod. Estuaries, Coastal and Shelf Sciences 87: 501-650. http://dx.doi.org/10.1016/j.ecss.2010.02.014. (Journal Articles)
  • Tuya F., Vanderklift M., Wernberg T., Thomsen MS., Hynes G. and Hanson C. (2010) Proximity to edges impacts cross-habitat flows: implications for abundance patterns and species interactions. Marine Ecology Progress Series 405: 175-186. http://dx.doi.org/10.3354/meps08516. (Journal Articles)
  • Waters JM., Wernberg T., Connell SD., Thomsen MS., Zuccarello J., Kraft GT., Sanderson C., West JA. and Gurgel CFD. (2010) Australia’s marine biogeography revisited: back to the future? Austral Ecology 35: 988-992. http://dx.doi.org/10.1111/j.1442-9993.2010.02114.x. (Journal Articles)
  • Wernberg T., Thomsen MS., Tuya F., Kendrick G. and Staerh P. (2010) The resilience of Australasian kelp beds decrease along a latitudinal gradient in ocean temperature. Ecology Letters 13: 685-694. http://dx.doi.org/10.1111/j.1461-0248.2010.01466.x. (Journal Articles)
  • Wernberg T., Tuya F., Thomsen MS. and Kendrick GA. (2010) Turban snails as habitat for foliose algae: contrasting geographical patterns in species richness. Marine & Freshwater Research 61: 1-6. http://dx.doi.org/10.1071/MF09184. (Journal Articles)
  • Nyberg C., Thomsen MS. and Wallentinus I. (2009) Flora and fauna associated with the introduced red alga Gracilaria vermiculophylla. European Journal of Phycology 44: 395-403. http://dx.doi.org/10.1080/09670260802592808. (Journal Articles)
  • Silliman BR., Bertness MD. and Thomsen MS. (2009) Trophic cascades and climate change in southern US marshes: Will the over-harvesting of blue crabs and drought stress trigger massive die-off of southern salt marshes? In Silliman BR; Bertness MD; Strong D (Ed.), Human Impacts on Salt Marshes: A Global Perspective: 103-114. London: University of California Press. (Chapters)
  • Thomsen MS., Adam P. and Silliman BR. (2009) Anthropogenic threats to Australasian coastal salt marshes. In Silliman BR; Bertness MD; Strong D (Ed.), Human Impacts on Salt Marshes: A Global Perspective: 361-390. London: University of California Press. (Chapters)
  • Thomsen MS., McGlathery KJ., Schartschild A. and Silliman BR. (2009) Distribution and ecological role of the non-native macroalgae Gracilaria vermiculophylla in Virginia salt marshes. Biological Invasions 11: 2303-2316. http://dx.doi.org/10.1007/s10530-008-9417-9. (Journal Articles)
  • Thomsen MS., Wernberg B., Silliman BR. and Tuya F. (2009) Evidence for impacts of non-indigenous macroalgae: a meta-analysis of experimental field studies. 45 : 10-15. http://dx.doi.org/10.1111/j.1529-8817.2009.00709.x. (Journal Articles)
  • Thomsen MS., Wernberg T., Silliman BR. and Josefson A. (2009) Broad-scale patterns of abundance of non-indigenous soft-bottom invertebrates in Denmark. Helgoland Marine Research 63: 159-167. http://dx.doi.org/10.1007/s10152-008-0142-7. (Journal Articles)
  • Tuya F., Wernberg T. and Thomsen MS. (2009) Colonization of gastropods on subtidal reefs depends on density in adjacent habitats, not on disturbance regime. Journal of Molluscan Studies 75: 27-33. http://dx.doi.org/10.1093/mollus/eyn032. (Journal Articles)
  • Tuya F., Wernberg T. and Thomsen MS. (2009) Habitat structure affect abundances of labrid fishes across temperate reefs in south-western Australia. Environmental Biology of Fishes 86: 311-319. http://dx.doi.org/10.1007/s10641-009-9520-5. (Journal Articles)
  • Thomsen MS., Wernberg T., Stæhr PA., Krause-Jensen D., Josefson A. and Tendal O. (2008) Introduced animals and plants in Denmark - terminology, mechanisms and effects (in Danish). Naturens Verden 6: 10-18. (Journal Articles)
  • Thomsen MS., Wernberg T., Stæhr PA., Silliman BR., Josefson AB., Krause-Jensen D. and Risgaard-Petersen N. (2008) Annual changes in abundance of non-indigenous marine benthos on a very large spatial scale. Aquatic Invasions 3: 133-139. http://dx.doi.org/10.3391/ai.2008.3.2.3. (Journal Articles)
  • Tuya F., Wernberg T. and Thomsen MS. (2008) Testing the 'abundant centre' hypothesis on endemic reef fishes in south-western Australia. Marine Ecology Progress Series 372: 225-230. http://dx.doi.org/10.3354/meps07718. (Journal Articles)
  • Tuya F., Wernberg T. and Thomsen MS. (2008) The spatial arrangement of reefs alters the ecological patterns of fauna between interspersed algal habitats. Estuarine, Coastal and Shelf Science 78(4): 774-782. http://dx.doi.org/10.1016/j.ecss.2008.02.017. (Journal Articles)
  • Tuya F., Wernberg T. and Thomsen MS. (2008) The spatial arrangement of reefs alters the ecological patterns of fauna between interspersed algal habitats. Estuarine, Coastal and Shelf Science 78: 774-782. http://dx.doi.org/10.1016/j.ecss.20. (Journal Articles)
  • Thomsen MS. and McGlathery KJ. (2007) Stress tolerance of the invasive macroalgae Codium fragile and Gracilaria vermiculophylla in a soft-bottom turbid lagoon. Biological Invasions 9: 1-12. http://dx.doi.org/10.1007/s10530-006-9043-3. (Journal Articles)
  • Thomsen MS., Silliman BR. and McGlathery KJ. (2007) Spatial variation in recruitment of native and invasive sessile species onto oyster reefs in a temperate soft-bottom lagoon. Estuarine, Coastal & Shelf Science 89-101: 72. http://dx.doi.org/10.1016/j.ecss.2006.10.004. (Journal Articles)
  • Thomsen MS., Stæhr P., Nyberg C., Krause-Jensen D., Schwærter S. and Silliman BR. (2007) Gracilaria vermiculophylla in northern Europe, with focus on Denmark, and what to expect in the future. Aquatic Invasions 2: 83-94. http://dx.doi.org/10.3391/ai.2007.2.2.1. (Journal Articles)
  • Thomsen MS., Wernberg T., Stæhr PA., Krause-Jensen D., Risgaard-Petersen N. and Silliman BR. (2007) Alien macroalgae in Denmark - a broad-scale national perspective. Marine Biology Research 3: 61-72. http://dx.doi.org/10.1080/17451000701213413. (Journal Articles)
  • Thomsen MS. and McGlathery KJ. (2006) Effects of accumulations of sediments and drift algae on recruitment of sessile organisms associated with oyster reefs. Journal of Experimental Marine Biology and Ecology 328: 22-34. http://dx.doi.org/10.1016/j.jembe.2005.06.016. (Journal Articles)
  • Thomsen MS., Gurgel CFD., Fredericq S. and McGlathery KJ. (2006) Gracilaria vermiculophylla (Rhodophyta, Gracilariales) in Hog Island Bay, Virginia: a cryptic alien and invasive macroalgae and taxonomic corrections. Journal of Phycology 42: 139-141. http://dx.doi.org/10.1111/j.1529-8817.2006.00160.x. (Journal Articles)
  • Thomsen MS., McGlathery KJ. and Tyler AC. (2006) Macroalgal distribution pattern in a shallow, soft-bottom lagoon, with emphasis on the nonnative Gracilaria vermiculophylla and Codium fragile. Estuaries and Coasts 29: 465-473. http://dx.doi.org/10.1007/BF02784994. (Journal Articles)
  • Thomsen MS., Wernberg T., Stæhr PA. and Pedersen MF. (2006) Spatio-temporal distribution patterns of the invasive macroalga Sargassum muticum within a Danish Sargassum-bed. Helgoland Marine Research 60: 50-58. http://dx.doi.org/10.1007/s10152-005-0016-1. (Journal Articles)
  • Pedersen MF., Stæhr PA., Wernberg T. and Thomsen MS. (2005) Biomass dynamics of exotic Sargassum muticum and native Halidrys siliquosa in Limfjorden, Denmark - implications of species replacements on turnover rates. Aquatic Botany 83: 31-47. http://dx.doi.org/10.1016/j.aquabot.2005.05.004. (Journal Articles)
  • Thomsen MS. and McGlathery K. (2005) Facilitation of macroalgae by the sedimentary tube forming polychaete Diopatra cuprea. Estuarine, Coastal and Shelf Science 63-73: 62. http://dx.doi.org/10.1016/j.ecss.2004.08.007. (Journal Articles)
  • Thomsen MS. and Wernberg T. (2005) Miniview: What affects the forces required to break or dislodge macroalgae? European Journal of Phycology 40: 1-10. http://dx.doi.org/10.1080/09670260500123591. (Journal Articles)
  • Thomsen MS., Krause-Jensen D., Wernberg T., Stæhr PA. and Risgaard NP. (2005) Alien seaweeds in Denmark: Where? When? How many? (in Danish). Urt 29: 110-115. (Journal Articles)
  • Wernberg T. and Thomsen MS. (2005) The effect of wave exposure on the morphology of Ecklonia radiata in southwestern Australia. Aquatic Botany 83: 61-70. http://dx.doi.org/10.1016/j.aquabot.2005.05.007. (Journal Articles)
  • Thomsen MS. (2004) Species, thallus size and substrate determine macroalgal break forces and break places in a low energy soft bottom lagoon. Aquatic Botany 80: 153-161. http://dx.doi.org/10.1016/j.aquabot.2004.08.002. (Journal Articles)
  • Thomsen MS., Wernberg T. and Kendrick G. (2004) The effect of thallus size, life stage, aggregation, wave exposure and substrate conditions on the forces required to break or dislodge the small kelp Ecklonia radiata. Botanica Marina 47: 454-460. http://dx.doi.org/10.1515/BOT.2004.068. (Journal Articles)
  • Wernberg T., Thomsen MS., Stæhr PA. and Pedersen MF. (2004) Epibiota communities of the introduced and indigenous macroalgal relatives Sargassum muticum and Halidrys siliquosa in Limfjorden (Denmark). Helgoland Marine Research 58: 154-161. http://dx.doi.org/10.1007/s10152-004-0180-8. (Journal Articles)
  • Wernberg T., Coleman M., Fairhead A., Miller S. and Thomsen MS. (2003) Morphology of Ecklonia radiata (C. Ag.) J. Agardh. along its geographic distribution in Southwestern Australia and Australasia. Marine Biology 143: 47-55. http://dx.doi.org/10.1007/s00227-003-1069-9. (Journal Articles)
  • Wernberg T., Thomsen MS., Stæhr PA. and Pedersen MF. (2001) Comparative phenology of Sargassum muticum and Halidrys siliquosa (Phaeophycae: Fucales) in Limfjorden, Denmark. Botanica Marina 44: 31-49. http://dx.doi.org/10.1515/BOT.2001.005. (Journal Articles)
  • Stæhr PA., Pedersen MF., Thomsen MS., Wernberg T. and Krause-Jensen D. (2000) The Invasion of Sargassum muticum in Limfjorden (Denmark) and its possible impact on the indigenous macroalgal community. Marine Ecology Progress Series 207: 79-88. http://dx.doi.org/10.3354/meps207079. (Journal Articles)
  • Wernberg T., Thomsen MS. and Stæhr PA. (1998) The invasion of japweed (Sargassum muticum) in Denmark - status anno 1998 (in Danish). Urt 4: 128-132. (Journal Articles)

Student Supervision

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    Completed
  • PhD - Foster T: Distributions and interactions of co-occuring estuarine foundation species: seagrasses, seaweeds, and shell-forming organisms (2019)
  • PhD - Siciliano A: Testing when and how habitat cascades control biodiversity of marine benthic ecosystems (2018)
  • Masters - Brockerhoff D: Distribution of the invasive seaweed Undria pinnatifda in Lyttelton Harbour, New Zealand, and its interactions with native mussel reef communities (2018)
  • Masters - Hildebrand T: Interaction between epibiota, parasites and life history parameters of cockles in a recovery estuary. (2015)
  • Masters - Hildebrand TC: Interactions between epibiota, parasites and life history parameters of cockles in a recovering estuary (2015)
  • Masters - Metcalfe I: Phenological, physiological and ecological factors influencing Notheia anomala and its obligate host Hormosira banksii (2017)
  • Masters - Metcalfe IH: Phenological, physiological, and ecological factors affecting the epiphyte Notheia anomala and its obligate host Hormosira banksii (2017)
  • Masters - Mondardini L: Interaction between invertebrates and bull kelp on an earthquake-disturbed coastline (2018)
  • Summer Student - Meijer C: Is living on each other a problem or a solution? (2015)

Editorial Work

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  • Aquatic Botany Editorial Board Member ( 2015 - 2023)

Research Projects

  • Developing tools to manage and monitor health of seagrass beds
  • Seagrass restoration, ecosystem services and blue carbon
  • Variation over time: diversity from genes to communities
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