Dr. Jeffrey Krause


Assistant Professor, University of South Alabama
Senior Marine Scientist, Dauphin Island Sea Lab

Ph.D. 2008, College of Oceanic & Atmospheric SciencesOregon State University

: Phytoplankton ecology, physiology and marine biogeochemistry

Research Interests

I am interested in how phytoplankton (microscopic algae) cycle nutrients within the upper ocean where light penetrates.  My research focuses on the ecology of diatoms, a group of phytoplankton.  Diatoms have a characteristic shell made of amorphous silica (SiO2-nH2O), which is more dense than the seawater they live (i.e. diatoms sink).  They have a global distribution in both marine and freshwater environments and can occur in very high numerical abundances. 
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Current Funded Research Projects:

“Alabama Center for Ecological Resilience (ACER):  Impacts of the DWH accident on phytoplankton-microzooplankton resiliency.”  Gulf of Mexico Research Initiative Consortium.  Jan. 2015 – Dec. 2017.  $707,466 (includes subward to Rutgers University).  PIs:  Krause, J.W. (DISL) and Thamatrakoln, K. (Rutgers).  
“Group-Specific Diatom Silica Production in a Coastal Upwelling System.”  National Science Foundation:  Biological Oceanography. Apr. 2012 – Mar. 2016.  $453,487.  PI:  Krause, J.W.
“Understanding the role of picocyanobacteria in the marine silicate cycle.”  National Science Foundation: Biological Oceanography.  PIs: Krause, J.W. (DISL) and Brzezinski, M.A. (UCSB).  Jan. 2012 – Dec. 2015.  $256,128.  Part of Collaborative Research Project with Baines, S.B. & Collier, J.L. (Stony Brook University), Twining, B.S. (Bigelow Laboratory for Ocean Sciences)


Baumann, M.S., Moran, S.B., Lomas, M.W., Kelly, R.P., Bell, D.W., Krause, J.W.  In press.  Diatom control of the autotrophic community and particle export in the eastern Bering Sea during the recent cold years (2008-2010).  Journal of Marine Research.
Krause, J.W., Brzezinski, M.A., Goericke, R., Landry, M.R., Ohman, M. D., Stukel, M. R., Taylor, A.G.  2015.  Variability in diatom contributions to biomass, organic matter production and export across a frontal gradient in the California Current Ecosystem.  Journal of Geophysical Research Oceans 120, 1032–1047, doi:10.1002/2014JC010472.
Wilson, C., Villareal, T.A., Brzezinski, M.A., Krause, J.W., Shcherbina, A.Y.  2013.  Chlorophyll bloom development and the subtropical front in the North Pacific.   Journal of Geophysical Research Oceans 118 (3), 1473-1488.  doi: 10.1002/jgrc.20143
Krause, J.W., Brzezinski, M.A., Siegel, D.A., Thunell, R.C.  2013.  Biogenic silica standing stock and export in the Santa Barbara Channel ecosystem.  Journal of Geophysical Research Oceans 118 (2), 736-749.  doi:10.1029/2012JC008070
Krause, J.W., Brzezinski, M.A., Villareal, T.A., Wilson, C. 2013.  Biogenic silica cycling during summer phytoplankton blooms in the North Pacific subtropical gyre.   Deep-Sea Research I 71, 49-60.  doi:  10.1016/j.dsr.2012.09.002
Baines, S.B., Twining, B.S., Brzezinski, M.A., Krause, J.W., Vogt, S., Assael, D., McDaniel, H.  2012.  Significant silicon accumulation by marine picocyanobacteria.  Nature Geoscience 5, 886-891.  doi: 10.1038/ngeo1641
Krause, J.W., Brzezinski, M.A., Villareal, T.A., Wilson, C.  2012.  Increased kinetic efficiency for silicic acid uptake as a driver of summer diatom blooms in the North Pacific subtropical gyre.  Limnology and Oceanography 57 (4), 1084–1098.  doi:10.4319/lo.2012.57.4.1084
Villareal, T.A., Brown, C.G., Brzezinski, M.A., Krause, J.W., Wilson, C.  2012.  Summer Diatom Blooms in the North Pacific Subtropical Gyre: 2008–2009. PLoS ONE 7: e33109. doi:10.1371/journal.pone.0033109
Brzezinski, M.A., Krause, J.W., Church, M.J., Karl, D.M., Li, B., Jones, J.L., Updyke, B.  2011.  The annual silica cycle of the north Pacific subtropical gyre.  Deep-Sea Research I 58, 988-1001.  doi:10.1016/j.dsr.2011.08.001
Krause, J.W., Brzezinski, M.A., Jones, J.L.  2011.  Application of low-level beta counting of 32Si for the measurement of silica production rates in aquatic environments.  Marine Chemistry 127, 40-47.  doi:10.1016/j.marchem.2011.07.001
Krause, J.W., Nelson, D.M., Brzezinski, M.A., 2011.  Biogenic silica production and diatoms’ estimated contribution to primary production and nitrate uptake in the eastern equatorial Pacific Ocean.  Deep-Sea Research II 58 (3-4), 434-448.  doi:10.1016/j.dsr2.2010.08.010
Brzezinski, M.A., Baines, S.B., Balch, W.M., Beucher, C.P., Chai, F., Dugdale, R.C., Krause, J.W., Landry, M.R., Marchi, A., Measures, C.I., Nelson, D.M., Parker, A.E., Poulton, A.J., Selph, K.E., Strutton, P.G., Taylor, A.G., Twining, B.S., 2011.  Co-limitation of diatoms by iron and silicic acid in the equatorial Pacific. Deep-Sea Research II 58 (3-4), 493-511.  doi:10.1016/j.dsr2.2010.08.005
Demarest, M.S., Brzezinski, M.A., Nelson, D.M., Krause, J.W., Jones, J.L., Beucher, C., 2011.  Net biogenic silica production and nitrate regeneration determine the strength of the silica pump in the Eastern Equatorial Pacific.  Deep-Sea Research II 58 (3-4), 462-476.  doi:10.1016/j.dsr2.2010.08.007
Krause, J.W., Brzezinski, M.A., Landry, M.R., Baines, S.B., Nelson, D.M., Selph, K.E., Taylor, A.G., Twining, B.S.  2010.  The effects of biogenic silica detritus, zooplankton grazing, and diatom size structure on Si-cycling in the euphotic zone of the eastern equatorial Pacific.  Limnology & Oceanography 55 (6), 2608-2622, doi:10.4319/lo2010.55.6.2608
Krause, J.W., Nelson, D.M., Lomas, M.W., 2010.  Production, dissolution, accumulation, and potential export of biogenic silica in a Sargasso Sea mode-water eddy.  Limnology & Oceanography 55 (2), 569-579, doi: 10.4319/lo.2010.55.2.0569


Biological Oceanography (Graduate, University of South Alabama)   
Physiology and Ecology of Marine Microalgae (Graduate, University of South Alabama)   
Introduction to Oceanography  (Undergraduate/Graduate, Dauphin Island Sea Lab)  
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