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I work on the microalgae that power almost all aquatic food webs. Microalgae are organisms such as diatoms, dinoflagellates, coccolithophores and cyanobacteria. I am interested in microalgal life-history and metabolism. I studied for a BSc (Hons) in Marine Biology at the University of Liverpool and for a PhD in Microalgal Ecophysiology at the Queens University of Belfast. In my PhD work I examined cell death in dinoflagellates, both in a free-living (planktonic) species and also in a symbiotic (within coral) species. In this way I worked on the ecosystem-scale process of coral bleaching in collaboration with colleagues in Queensland, Australia. After a one-year Royal Society of London Fellowship to Australia I returned to the UK to work at the University of East Anglia on the DMSP content and potential for DMS release in a range of coccolithophores. DMS is a trace gas thought to be important in climate regulation. Since 2007 I have returned to working on microalgal cell death through the use of continuous culture and flow cytometry... Flow cytometry allows characterisation of the sequence of changes that occur during microalgal cell death. I am currently expanding my research programme to examine cell death in cyanobacteria and have local applied research interests in Poole harbour where, along with colleagues, we are examining the growth and survival of the Manila clam, an important local aquaculture species.more
We are currently investigating various aspects of cyanobacteria (Microcystis) ecology and physiology both in the field and in the lab. The general use of flow cytometry in the assessment of microbial communities and physiological state remains a focus of my lab. I maintain an applied interest in the phytoplankton of Poole harbour and their role in shellfish nutrition and the overall trophic status of the harbour. Less current research interests include the ecology and physiology of eukaryotic phytoplankton (diatoms, dinoflagellates coccolithophores and flagellates) and biological oceanography in general.
- Steele, D.J., Kimmance, S.A., Franklin, D.J. and Airs, R.L., 2018. Occurrence of chlorophyll allomers during virus-induced mortality and population decline in the ubiquitous picoeukaryote Ostreococcus tauri. Environmental Microbiology, 20 (2), 588-601.
- Le Quéré, C., Franklin, D.J. et al., 2016. Role of zooplankton dynamics for Southern Ocean phytoplankton biomass and global biogeochemical cycles. Biogeosciences, 13 (14), 4111-4133.
- Hartnell, D.M., Chapman, I.J., Esteban, G.F. and Franklin, D.J., 2016. Exploiting eco-physiological niche to facilitate the separation of the freshwater cyanobacteria Microcystis sp. and Synechococcus sp. Journal of Microbiological Methods, 122, 13-15.
- Chapman, I.J., Esteban, G.F. and Franklin, D.J., 2016. Molecular probe optimization to determine cell mortality in a photosynthetic organism (Microcystis aeruginosa) using flow cytometry. Journal of Visualized Experiments, 2016 (107).
- Chapman, I.J., Esteban, G.F. and Franklin, D.J., 2016. Molecular Probe Optimization to Determine Cell Mortality in a Photosynthetic Organism (Microcystis aeruginosa) Using Flow Cytometry. JOVE-JOURNAL OF VISUALIZED EXPERIMENTS.
- Steele, D.J., Tarran, G.A., Widdicombe, C.E., Woodward, E.M.S., Kimmance, S.A., Franklin, D.J. and Airs, R.L., 2015. Abundance of a chlorophyll a precursor and the oxidation product hydroxychlorophyll a during seasonal phytoplankton community progression in the Western English Channel. Progress in Oceanography, 137, 434-445.
- Franklin, D.J., 2014. Explaining the causes of cell death in cyanobacteria: What role for asymmetric division. Journal of Plankton Research, 36 (1), 11-17.
- Steele, D.J., Franklin, D.J. and Underwood, G.J.C., 2014. Protection of cells from salinity stress by extracellular polymeric substances in diatom biofilms. Biofouling, 30 (8), 987-998.
- Franklin, D., 2012. Coral bleaching. Synthia, 1 (1), 14-15.
- Franklin, D.J., Airs, R.L., Fernandes, D.J., Bell, T.G., Bongaerts, R.J., Berges, J.A. and Malin, G., 2012. Identification of senescence and death in Emiliania huxleyi and Thalassiosira pseudonana: Cell staining, chlorophyll alterations, and dimethylsulfoniopropionate (DMSP) metabolism. Limnology and Oceanography, 57, 305-317.
- Franklin, D., Airs, R.L., Fernandes, M., Bell, T.G., Bongaerts, R.J., Berges, J.A. and Malin, G., 2012. Identification of senescence and death in Emiliania huxleyi and Thalassiosira pseudonana: Cell staining, chlorophyll alterations, and dimethylsulfoniopropionate (DMSP) metabolism. Limnology and Oceanography, 57 (1), 305-317.
- Hughes, C., Franklin, D.J. and Malin, G., 2011. Iodomethane production by two important marine cyanobacteria: Prochlorococcus marinus (CCMP 2389) and Synechococcus sp (CCMP 2370). Marine Chemistry, 125, 19-25.
- Franklin, D.J., Stanke, M., Young, J., Probert, I. and Malin, G., 2010. Dimethylsulphoniopropionate (DMSP), DMSPlyase activity (DLA) and dimethylsulphide (DMS) in 10 species of coccolithophore. Marine Ecology Progress Series.
- Fitt, W.K., Franklin, D.J. et al., 2009. Response of two species of Indo-Pacific corals, Porites cylindrica and Stylophora pistillata, to short-term thermal stress: The host does matter in determining the tolerance of corals to bleaching. Journal of Experimental Marine Biology and Ecology, 373, 102-110.
- Franklin, D.J., Poulton, A.J., Steinke, M., Young, J., Peeken, I. and Malin, G., 2009. Dimethylsulphide, DMSP-lyase activity and microplankton community structure inside and outside of the Mauritanian upwelling. Progress in Oceanography, 83, 134-142.
- Franklin, D.J., Choi, C.J., Hughes, C., Malin, G. and Berges, J.A., 2009. Effect of dead phytoplankton cells on the apparent efficiency of photosystem II. Marine Ecology Progress Series, 382, 35-40.
- Buitenhuis, E.T., Pangerc, T., Franklin, D.J., Le Quere, C. and Malin, G., 2008. Growth rates of six coccolithophorid strains as a function of temperature. Limnology and Oceanography, 53, 1181-1185.
- Franklin, D.J., BrussAard, C.P.D. and Berges, J.A., 2006. What is the role and nature of programmed cell death in phytoplankton ecology? European Journal of Phycology, 41, 1-14.
- Franklin, D.J., Molina Cedres, C.M. and Hoegh-Guldberg, O., 2006. Increased mortality and photoinhibition in the symbiotic dinoflagellates of the Indo–Pacific coral Stylophora pistillata (Esper) after summer bleaching. Marine Biology, 149, 633-642.
- Franklin, D.J. and Berges, J.A., 2004. Mortality in cultures of the dinoflagellate Amphidinium carterae during culture senescence and darkness. Proceedings of the Royal Society Series B: Biological Sciences, 271, 2099-2107.
- Franklin, D.J., Hoegh-Guldberg, O., Jones, R.J. and Berges, J.A., 2004. Cell death and degeneration in the symbiotic dinoflagellates of the coral Stylophora pistillata during bleaching. Marine Ecology Progress Series, 272, 117-130.
- Montagnes, D.J.S. and Franklin, D.J., 2001. Effect of temperature on diatom volume, growth rate, and carbon and nitrogen content: Reconsidering some paradigms. Limnology and Oceanography, 46, 2008-2018.
- Berges, J.A., Franklin, D.J. and Harrison, P.J., 2001. Evolution of an artificial seawater medium: improvements in enriched seawater, artificial water over the last two decades. Journal of Phycology, 37, 1138-1145.
- Franklin, D., Harris, M.R.C., Humphreys, J., Chapman, I.J., Herbert, R., Jensen, A. and Purdie, D., 2017. Investigating the sustainability of the Poole Harbour Manila clam fishery; phytoplankton seasonality and its relationship with clam condition index. In: Marine Protected Areas. Science, Policy & Management 15-17 May 2017 Poole.
- Thornton, A., Herbert, R.J.H., Stillman, R.A.S. and Franklin, D., 2015. Does nutrient pollution transform upper trophic levels of estuarine food webs? In: ECSA 55: 55th Conference of Estuarine Coastal Sciences Association 6 September 2015-9 September 2016 ExCel Exhibition Centre Royal Victoria Dock London.
- Hartnell, D.M., Chapman, I.J., Esteban, G.F. and Franklin, D.J., 2015. USING KNOWLEDGE OF ECOLOGICAL NICHE REQUIREMENTS TO SEPARATE THE FRESHWATER CYANOBACTERIA MICROCYSTIS SP AND SYNECHOCOCCUS SP AND CREATE FRESH CULTURE LINES. 206-207.
- Franklin, D., Pinder, A., Harrison, A., Herbert, R., O'Brien, W. and Pegg, J., 2016. Poole Park Lakes: Research and monitoring. BUG.
- Harrison, A., Pinder, A., Herbert, R., Pegg, J., O'Brien, W. and Franklin, D., 2016. Poole Park Lakes: Research and monitoring. BUG.
- Franklin, D., Humphreys, J., Harris, M., Jensen, A.C., Herbert, R.J.H. and Purdie, D.A., 2012. An investigation into the annual cycle of phytoplankton abundance in Poole Harbour and its relationship with Manila clam nutrition.. Marine Management Organisation.
- Ian Chapman. Microcystis ecology and physiology
- Deborah Steele. Chlorophyll allomers and cell viability in nanoeukaryotes
- Anne Thornton. Ecological effects of green tides
- David Hartnell, 2017. Ecology of Microcystis cyanotoxins
Profile of Teaching UG
- Environmental Pollution
- Freshwater Resource Management
- Practical Skills
- Field Research Environment
- Marine Geography
- Phytoplankton abundance and shellfish success in Poole Harbour (Marine Management Organisation, 31 Aug 2011). Completed
- Committee Heads of Environmental Science, Member of National Executive (2013-)
- Natural Environment Research Council, Member of Peer Review College (2011-2016)
- British Phycological conference, Grazing of the ciliate Blepharisma americanum on one strain of Chlorella and three strains of Microcystis: grazing differences between strains linked to microcystin content, 22 Jun 2016, BU
- International Society for Protistology, Grazing of Blepharisma americanum on toxic and non-toxic Microcystis aeruginosa cells, 05 Sep 2015, Seville
- British Phycological Society meeting, Effects of light intensity on cell growth and microcystin production in Microcystis PCC 7806: A toxic cyanobacterium, 23 Jun 2016, Bournemouth
- European Phycological Congress, Using knowledge of ecological niche requirements to separate the freshwater cyanobacteria Microcystis sp. and Synechococcus sp. and create fresh culture lines, 23 Aug 2016, London
- PhD in Microalgal ecology (Queen's University of Belfast, 2002)
- BSc (Hons) in Marine Biology (University of Liverpool, 1998)
- Fellow in Teaching and learning (HEA, 2013)
- Association for the sciences of Limnology & Oceanography, Member (2011-),
- British Phycological Society, Member (2010-),
- Challenger Society for Marine Science, Member,