Dr. Jeffrey Krause
Associate Professor, University of South Alabama
Senior Marine Scientist, Dauphin Island Sea Lab
Ph.D. 2008, College of Oceanic & Atmospheric Sciences, Oregon State University
Emphasis: Phytoplankton ecology, physiology and marine biogeochemistry
Diatoms are important because:
- Their cumulative global contribution to primary production is similar to that of the rain forests
- They are important players in the oceanic cycles of Carbon, Nitrogen, and Silicon
- The sinking of diatom silica, and their associated organic matter, is a major component of the "Biological Pump"
- The production and cycling of diatom silica plays a fundamental role in regulating the exchange of CO2 between the ocean and atmosphere
Marine cyanobacteria and Silicon?
Recently, I have also worked on examining the role of picocyanobacteria in the global Silicon cycle, specifically those from the genus Synechococcus. Photosynthetic cyanobacteria, primarily from the genre Prochlorococcus and Synechococcus, are the most abundant photosynthetic organisms on earth and generally the most abundant members of the phytoplankton community. Recently, our Nature Geoscience paper demonstrates that laboratory cultures and field cells (from eastern equatorial Pacific and Sargasso Sea) of Synechococcus accumulate elemental Silicon and we suggest that "picocyanobacteria may exert a previously unrecognized influence on the oceanic silicon cycle, especially in nutrient-poor waters." A collaboration of scientists at Stony Brook University, Bigelow Laboratory for Ocean Sciences, UCSB and DISL, are currently funded by the National Science Foundation to examine the variability in Silicon quotas for cultured clones and field cells of Synechococcus and quantify their potential contribution to the rate which silica is produced in the open ocean (work with the Bermuda Atlantic Time-series Study program).
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,
“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)|
Current Lab Personnel:
|Sydney Acton||(Lab Manager/Technician)|
|Liesl Cole||(M.S. student, University of South Alabama)|
|Israel Marquez||(M.S./Ph.D. student, University of South Alabama)|
|Heather McNair||(Ph.D. student, University of California Santa Barbara)|
|Rebecca Pickering-Turner||(Ph.D. student, University of South Alabama)|