Associate Professor Linn Hoffmann, Our People, Department of Botany, University of Otago, New Zealand

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Marine botany

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Email: linn.hoffmann@otago.ac.nz

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Phone: +64 3 479 7583

Research interests

My work focuses on the effect of different environmental stressors for marine phytoplankton physiology and ecology. I am thereby mainly interested in the effect of climate change related stressors such as ocean acidification and ocean warming and the effect of trace metals e.g. from volcanic eruptions on marine phytoplankton and the implications for higher trophic levels of the food chain. I also work on biomechanical properties of diatom frustules and how they are affected by environmental conditions.

Associate Professor Hoffmann is director of the Ocean Acidification Research Theme

Associate Professor Hoffmann is also a member of the Coastal People: Southern Skies collaboration that connects communities with world-leading, cross-discipline research to rebuild coastal ecosystems.
Coastal People: Southern Skies

Current research

Some of the research projects that I am currently involved in include:

What is the effect of trace metal release from volcanic eruptions for marine phytoplankton species distribution and productivity?

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NASA satellite image of Puyehue eruption in 2011 in Chile.

How does ocean acidification affect trace metal bioavailability and what are the implications thereof for marine phytoplankton?

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How is phytoplankton species distribution in the Southern Ocean affected by climate change?

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SEHACK-secchi plankton study.

Does bioaccumulation of iron by seabirds enhance productivity around sub-Antarctic Islands?

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Photo credit: O Shatova.

Potential masters' or PhD research projects

Effect of ocean acidification on energy transfer in the marine food chain
Is diatom frustule stability affected by ocean acidification?
How does ocean acidification affect natural phytoplankton communities in the Southern Ocean?
Comparison of Fjordland phytoplankton communities New Zealand versus Chile
Volcanic eruptions and their effect on phytoplankton community structures

The University of Otago offers PhD scholarships to candidates with excellent academic records (irrespective of nationality). Please feel free to contact me if you are interested my research and would like to do your PhD in New Zealand. More information can be found on the Scholarships page.

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Postgraduate students

Nadjejda Espinel (PhD): Changes in larval settlement and metamorphosis in marine invertebrates in response to reduced seawater pH
Hannah Heynderickx (PhD): The effects of ocean acidification on phytoplankton‐bacteria interactions in Southern Ocean waters
Morgan Meyers (PhD): How does ocean acidification affect copepod grazing in subAntarctic waters?
Madeleine Post (MSc)
“Amirreza Zarekarizi (PhD): Effect of cultivation condition on the production of fucoxanthin by microalgae

Previous students

Ro Allen (PhD): Effect of ocean acidification and warming on natural Southern Ocean phytoplankton communities
Kelsey Donahue
Chittipat Nitithamyong
Francie Rudminat (PhD): Dinitrogen fixation in the South Pacific – Effect of ocean acidification on marine diazotrophs

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Teaching

BTNY 203 Marine and Freshwater Botany (coordinator)
BTNY 301 Plant Ecology (co-coordinator)
BTNY 465 Plant and Environment
BIOL 123 Plants: How They Shape the World
OCEN 322 Biological Oceanography
ECOL 111 Ecology and Conservation of Diversity
ECOL212 Ecological Applications
ECOL211 Ecology of Communities and Ecosystems

Science Communication interview

Scott Bagley, one of Science Communication's students undertook an interview with Linn in 2015.
Science Communication student Scott Bagley interviews Dr Linn Hoffmann

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Publications

Meyers, M., Décima, M., Law, C. S., Gall, M., Barr, N., Miller, M. R., … Sabadel, A., Wing, S., & Hoffmann, L. (2022). No evidence of altered relationship between diet and consumer fatty acid composition in a natural plankton community under combined climate drivers. Journal of Experimental Marine Biology & Ecology, 551, 151734. doi: 10.1016/j.jembe.2022.151734

Zitoun, R., Achterberg, E. P., Browning, T. J., Hoffmann, L. J., Krisch, S., Sander, S. G., & Koschinsky, A. (2021). The complex provenance of Cu-binding ligands in the South-East Atlantic. Marine Chemistry. Advance online publication. doi: 10.1016/j.marchem.2021.104047

Allen, R. J., Summerfield, T. C., Harvey, B. P., Agostini, S., Rastrick, S. P. S., Hall-Spencer, J. M., & Hoffmann, L. J. (2021). Species turnover underpins the effect of elevated CO₂ on biofilm communities through early succession. Climate Change Ecology, 2, 100017. doi: 10.1016/j.ecochg.2021.100017

Cowley, G. T., McGraw, C. M., & Hoffmann, L. J. (2021). Environmental science in civic society and policy: Outreach for a better world today. Proceedings of the 14th Annual New Zealand Ocean Acidification Conference: Ocean Acidification in a Decade of Ocean Science. (pp. 25). Retrieved from http://nzoac.nz/conferences

Christensen, T. J. E., Zitoun, R., Hoffmann, L. J., Dillon, W. D. N., Dillingham, P. W., & McGraw, C. M. (2021). Redefining K_sp for calcite and aragonite with lower uncertainty in artificial seawater. Proceedings of the 14th Annual New Zealand Ocean Acidification Conference: Ocean Acidification in a Decade of Ocean Science. (pp. 24). Retrieved from http://nzoac.nz/conferences

Journal - Research Article

Espinel-Velasco, N., Tobias-Hünefeldt, S. P., Karelitz, S. E., Hoffmann, L. J., Morales, S. E., & Lamare, M. D. (2021). Reduced seawater pH alters marine biofilms with impacts for marine polychaete larval settlement. Marine Environmental Research, 167, 105291. doi: 10.1016/j.marenvres.2021.105291

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Harvey, B. P., Allen, R., Agostini, S., Hoffmann, L. J., Kon, K., Summerfield, T. C., … Hall-Spencer, J. M. (2021). Feedback mechanisms stabilise degraded turf algal systems at a CO₂ seep site. Communications Biology, 4(1), 219. doi: 10.1038/s42003-021-01712-2

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Allen, R., Hoffmann, L. J., Larcombe, M. J., Louisson, Z., & Summerfield, T. C. (2020). Homogeneous environmental selection dominates microbial community assembly in the oligotrophic South Pacific Gyre. Molecular Ecology, 29, 4680-4691. doi: 10.1111/mec.15651

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Allen, R., Hoffmann, L. J., Law, C. S., & Summerfield, T. C. (2020). Subtle bacterioplankton community responses to elevated CO₂ and warming in the oligotrophic South Pacific Gyre. Environmental Microbiology Reports, 12(4), 377-386. doi: 10.1111/1758-2229.12844

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Allen, R., Summerfield, T. C., Currie, K., Dillingham, P. W., & Hoffmann, L. J. (2020). Distinct processes structure bacterioplankton and protist communities across an oceanic front. Aquatic Microbial Ecology, 85, 19-34. doi: 10.3354/ame01938

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Gutiérrez-Rodriguez, A., Safi, K., Fernández, D., Forcén-Vázquez, A., Gourvil, P., Hoffmann, L., … Nodder, S. D. (2020). Decoupling between phytoplankton growth and microzooplankton grazing enhances productivity in Subantarctic waters on Campbell Plateau, southeast of New Zealand. Journal of Geophysical Research: Oceans, 125(2), e2019JC015550. doi: 10.1029/2019JC015550

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Hoffmann, L., Eggers, S. L., Allhusen, E., Katlein, C., & Peeken, I. (2020). Interactions between the ice algae Fragillariopsis cylindrus and microplastics in sea ice. Environment International, 139, 105697. doi: 10.1016/j.envint.2020.105697

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Hopwood, M. J., Santana-González, C., Gallego-Urrea, J., Sanchez, N., Achterberg, E. P., Ardelan, M. V., … Hoffmann, L., … Turner, D. (2020). Fe(II) stability in coastal seawater during experiments in Patagonia, Svalbard, and Gran Canaria. Biogeosciences, 17(5), 1327-1342. doi: 10.5194/bg-17-1327-2020

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Zitoun, R., Connell, S. D., Cornwall, C. E., Currie, K. I., Fabricius, K., Hoffmann, L. J., Lamare, M. D., Murdoch, J. H., … Sander, S. G., … Smith, A. M. (2020). A unique temperate rocky coastal hydrothermal vent system (Whakaari-White Island, Bay of Plenty, New Zealand): Constraints for ocean acidification studies. Marine & Freshwater Research, 71(3), 321-344. doi: 10.1071/mf19167

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Donahue, K., Klaas, C., Dillingham, P. W., & Hoffmann, L. J. (2019). Combined effects of ocean acidification and increased light intensity on natural phytoplankton communities from two Southern Ocean water masses. Journal of Plankton Research, 41(1), 30-45. doi: 10.1093/plankt/fby048

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Zarekarizi, A., Hoffmann, L., & Burritt, D. (2019). Approaches for the sustainable production of fucoxanthin, a xanthophyll with potential health benefits. Journal of Applied Phycology, 31, 281-299. doi: 10.1007/s10811-018-1558-3

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Espinel-Velasco, N., Hoffmann, L., Agüera, A., Byrne, M., Dupont, S., Uthicke, S., … Lamare, M. (2018). Effects of ocean acidification on the settlement and metamorphosis of marine invertebrate and fish larvae: A review. Marine Ecology Progress Series, 606, 237-257. doi: 10.3354/meps12754

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Faucher, G., Hoffmann, L., Bach, L. T., Bottini, C., Erba, E., & Riebesell, U. (2017). Impact of trace metal concentrations on coccolithophore growth and morphology: Laboratory simulations of Cretaceous stress. Biogeosciences, 14(14), 3603-3613. doi: 10.5194/bg-14-3603-2017

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Shatova, O. A., Wing, S. R., Hoffmann, L. J., Wing, L. C., & Gault-Ringold, M. (2017). Phytoplankton community structure is influenced by seabird guano enrichment in the Southern Ocean. Estuarine, Coastal & Shelf Science, 191, 125-135. doi: 10.1016/j.ecss.2017.04.021

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Conway, T. M., Hoffmann, L. J., Breitbarth, E., Strzepek, R. F., & Wolff, E. W. (2016). The growth response of two diatom species to atmospheric dust from the Last Glacial Maximum. PLoS ONE, 11(7), e0158553. doi: 10.1371/journal.pone.0158553

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Shatova, O., Wing, S. R., Gault-Ringold, M., Wing, L., & Hoffmann, L. J. (2016). Seabird guano enhances phytoplankton production in the Southern Ocean. Journal of Experimental Marine Biology & Ecology, 483, 74-87. doi: 10.1016/j.jembe.2016.07.004

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Hoffmann, L. J., Breitbarth, E., McGraw, C. M., Law, C. S., Currie, K. I., & Hunter, K. A. (2013). A trace-metal clean, pH-controlled incubator system for ocean acidification incubation studies. Limnology & Oceanography: Methods, 11, 53-61. doi: 10.4319/lom.2013.11.53

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Olgun, N., Duggen, S., Langmann, B., Hort, M., Waythomas, C. F., Hoffmann, L., & Croot, P. (2013). Geochemical evidence of oceanic iron fertilization by the Kasatochi volcanic eruption in 2008 and the potential impacts on Pacific sockeye salmon. Marine Ecology Progress Series, 488, 81-88. doi: 10.3354/meps10403

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Tatters, A. O., Roleda, M. Y., Schnetzer, A., Fu, F., Hurd, C. L., Boyd, P. W., … Hoffmann, L. J., & Hutchins, D. A. (2013). Short- and long-term conditioning of a temperate marine diatom community to acidification and warming. Philosophical Transactions of the Royal Society B, 368(1627), 20120437. doi: 10.1098/rstb.2012.0437

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Hoffmann, L. J., Breitbarth, E., Ardelan, M. V., Duggen, S., Olgun, N., ..., & Wängberg, S.-Å. (2012). Influence of trace metal release from volcanic ash on growth of Thalassiosira pseudonana and Emiliania huxleyi. Marine Chemistry, 132–133, 28-33. doi: 10.1016/j.marchem.2012.02.003

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Hoffmann, L. J., Breitbarth, E., Boyd, P. W., & Hunter, K. A. (2012). Influence of ocean warming and acidification on trace metal biogeochemistry. Marine Ecology Progress Series, 470, 191-205. doi: 10.3354/meps10082

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Law, C. S., Breitbarth, E., Hoffmann, L. J., McGraw, C. M., Langlois, R. J., LaRoche, J., … Safi, K. A. (2012). No stimulation of nitrogen fixation by non-filamentous diazotrophs under elevated CO₂ in the South Pacific. Global Change Biology, 18(10), 3004-3014. doi: 10.1111/j.1365-2486.2012.02777.x

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Smetacek, V., Klaas, C., Strass, V. H., Assmy, P., Montresor, M., Cisewski, B., … Hoffmann, L. J., … Wolf-Gladrow, D. (2012). Deep carbon export from a Southern Ocean iron-fertilized diatom bloom. Nature, 487, 313-319. doi: 10.1038/nature11229

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Wilken, S., Hoffmann, B., Hersch, N., Kirchgessner, N., Dieluweit, S., Rubner, W., Hoffmann, L. J., … Peeken, I. (2011). Diatom frustules show increased mechanical strength and altered valve morphology under iron limitation. Limnology & Oceanography, 56(4), 1399-1410. doi: 10.4319/lo.2011.56.4.1399

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Breitbarth, E., Achterberg, E. P., Ardelan, M. V., Baker, A. R., Bucciarelli, E., Chever, F., … Hoffmann, L., Hunter, K. A., … Ye, Y. (2010). Iron biogeochemistry across marine systems: Progress from the past decade. Biogeosciences, 7(3), 1075-1097.

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Duggen, S., Olgun, N., Croot, P., Hoffmann, L., Dietzel, H., Delmelle, P., & Teschner, C. (2010). The role of airborne volcanic ash for the surface ocean biogeochemical iron-cycle: A review. Biogeosciences, 7(3), 827-844.

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Breitbarth, E., Gelting, J., Walve, J., Hoffmann, L. J., Turner, D. R., Hassellöv, M., & Ingri, J. (2009). Dissolved iron (II) in the Baltic Sea surface water and implications for cyanobacterial bloom development. Biogeosciences, 6, 2397-2420.

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