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?
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?
How is phytoplankton species distribution in the Southern Ocean affected by climate change?
SEHACK-secchi plankton study.
Does bioaccumulation of iron by seabirds enhance productivity around sub-Antarctic Islands?
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.
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
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
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 Ksp 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
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
Journal - Research Article
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
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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
Journal - Research Article
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.
Journal - Research Article
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.
Journal - Research Article
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.
Journal - Research Article
Christensen, T. J. E., Zitoun, R., Hoffmann, L. J., Dillon, W. D. N., Dillingham, P. W., & McGraw, C. M. (2021). Redefining Ksp 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
Conference Contribution - Published proceedings: Abstract
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
Conference Contribution - Published proceedings: Abstract
Faucher, G., Wuttig, K., Bettoni, C., Erba, E., Koch, F., Trimborn, S., … Hoffmann, L. (2020). Influence of volcanic ash on growth and morphology of coccolithophore algae. Proceedings of the Ocean Sciences Meeting (OSM). CT41A-05. Retrieved from https://agu.confex.com/agu/osm20/meetingapp.cgi
Conference Contribution - Published proceedings: Abstract
Meyers, M., Décima, M., Currie, K. I., Hoffmann, L., & Wing, S. (2020). Salp distribution in coastal, subtropical, and subantarctic waters off the Southeast coast of New Zealand: Linking hydrology with ecosystem function. Proceedings of the Ocean Sciences Meeting (OSM). ME24E-0140. Retrieved from https://agu.confex.com/agu/osm20/meetingapp.cgi
Conference Contribution - Published proceedings: Abstract
Allen, R., Summerfield, T. C., Harvey, B., Agostini, S., & Hoffmann, L. J. (2019). Biofilm succession in an acidified ocean: Mechanistic insights from a volcanic CO2 seep study. Proceedings of the 12th New Zealand Ocean Acidification Workshop. (pp. 12). Retrieved from http://nzoac.nz
Conference Contribution - Published proceedings: Abstract
Meyers, M., Décima, M., Law, C., Deppeler, S., Saint-Macary, A., Gall, M., … Wing, S., & Hoffmann, L. (2019). Grazing of calanoid copepod Temora turbinata on natural prey communities during the CARIM Mesocosm 4 experiment. Proceedings of the 12th New Zealand Ocean Acidification Workshop. (pp. 39). Retrieved from http://nzoac.nz
Conference Contribution - Published proceedings: Abstract
Meyers, M., McGraw, C., Décima, M., & Hoffmann, L. (2019). Design and employment of a new portable CO2 system for ocean acidification experiments. Proceedings of the 12th New Zealand Ocean Acidification Workshop. (pp. 50). Retrieved from http://nzoac.nz
Conference Contribution - Published proceedings: Abstract
Allen, R., Rudminat, F., Law, C., Hoffmann, L., & Summerfield, T. (2018). Bacterioplankton resistance to acidification and warming in the oligotrophic ocean. Proceedings of the 11th New Zealand Ocean Acidification Workshop. (pp. 7). Retrieved from http://nzoac.nz
Conference Contribution - Published proceedings: Abstract
Espinel, N., Dupont, S., Uthicke, S., Byrne, M., Agüera, A., Hoffmann, L., & Lamare, M. (2018). The potential effects of ocean acidification on the settlement and metamorphosis of marine larvae: A review and with reference to CARIM experiments. Proceedings of the 11th New Zealand Ocean Acidification Workshop. (pp. 15). Retrieved from http://nzoac.nz
Conference Contribution - Published proceedings: Abstract
Meyers, M., Décima, M., Luan, Q., Hoffmann, L., & Wing, S. (2018). Copepod grazing and selectivity on natural prey communities during a high-temperature, low-pH mesocosm experiment. Proceedings of the 11th New Zealand Ocean Acidification Workshop. (pp. 19). Retrieved from http://nzoac.nz
Conference Contribution - Published proceedings: Abstract
Allen, R., Hoffmann, L., & Summerfield, T. (2017). The ecological and evolutionary importance of genetic diversity in phytoplankton responses to ocean acidification. Proceedings of the 10th New Zealand Ocean Acidification Workshop. (pp. 11). Retrieved from http://www.otago.ac.nz/oceanacidification/news/index.html
Conference Contribution - Published proceedings: Abstract
Hoffmann, L., & Donahue, K. (2017). Phytoplankton community composition response to ocean acidification and increased light intensities. Proceedings of the 10th New Zealand Ocean Acidification Workshop. (pp. 17). Retrieved from http://www.otago.ac.nz/oceanacidification/news/index.html
Conference Contribution - Published proceedings: Abstract
Law, C., Barr, N., Northcote, L., Gutierrez-Rodriguez, A., Decima, M., Marriner, A., … Fang, Z., Deans, F., Allen, R., Hoffmann, L., Baltar, F., & Gall, M. (2017). How will coastal plankton respond to increasing CO2? Preliminary results from the first two CAIRM mesocosm experiments. Proceedings of the 10th New Zealand Ocean Acidification Workshop. (pp. 20). Retrieved from http://www.otago.ac.nz/oceanacidification/news/index.html
Conference Contribution - Published proceedings: Abstract
Rudminat, F., Law, C., Hoffmann, L., & Summerfield, T. (2017). Bacterioplankton community response to elevated CO2 and/or temperature in the South Pacific. Proceedings of the 10th New Zealand Ocean Acidification Workshop. (pp. 26). Retrieved from http://www.otago.ac.nz/oceanacidification/news/index.html
Conference Contribution - Published proceedings: Abstract
Hoffmann, L. J., & Kearney, E. (2016). Effect of ocean acidification on diatom frustule stability. Proceedings of the 4th International Symposium on the Ocean in a High-CO2 World. Retrieved from http://www.highco2-iv.org/
Conference Contribution - Published proceedings: Abstract
Shatova, O., Wing, S., Hoffmann, L., Jack, L., & Gault-Ringold, M. (2015). Seabird guano enhances phytoplankton production in the Southern Ocean. Geophysical Research Abstracts, 17, EGU2015-166. [Abstract]
Conference Contribution - Published proceedings: Abstract
Law, C. S., Breitbarth, E., Hoffmann, L., McGraw, C., Langlois, R. R., LaRoche, J., … Safi, K. (2013). Are all nitrogen fixers ocean acidification "winners"? Proceedings of the 6th New Zealand Ocean Acidification Workshop. (pp. 33). Retrieved from http://www.otago.ac.nz/oceanacidification/news/
Conference Contribution - Published proceedings: Abstract
McGraw, C. M., Breitbarth, E., Hoffmann, L., & Hunter, K. A. (2012). Trace-metal clean automated culture system for ocean acidification experiments. Proceedings of the Ocean Sciences Meeting. (pp. 307-308). Retrieved from http://www.sgmeet.com/osm2012/
Conference Contribution - Published proceedings: Abstract
Hoffmann, L. (2019, July). Phytoplankton community distribution along the Munida Transect. Verbal presentation at the NZ Marine Sciences Society (NZMSS) Joint Meeting with the Oceania Chondrichthyan Society, Dunedin, New Zealand.
Conference Contribution - Verbal presentation and other Conference outputs