Jeffrey W. Krause, Ph.D.
Senior Marine Scientist II
Assistant Professor, University of South Alabama
As of December 2012, I transitioned to Senior Marine Scientist at the Dauphin Island Sea Lab in Dauphin Island, AL and in 2013 became an Assistant Professor in the Department of Marine Sciences at the University of South Alabama. I also hold an Assistant Research Biologist appointment in the Marine Science Institute at the University of California Santa Barbara. 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.
Here at DISL, we have developed the integrated Microbial Oceanography and Biogeochemistry (iMOB) facility to better serve the research needs of investigators and students. Click here for more information.
I also support Discovery Hall Programs' Marine Science High School Course with the R. Quackenbush Marine Science Scholarship. Click here to learn more about the scholarship.
Oregon State University, 2008
Assistant Professor, Department of Marine Sciences, University of South Alabama
Assistant Research Biologist, Marine Science Institute, UC Santa Barbara
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 in which 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.
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, our group is examining the role of picocyanobacteria in the global Silicon cycle, specifically those from the genus Synechococcus. Photosynthetic cyanobacteria, primarily from the genra Prochlorococcus and Synechoccocus, are the most abundant photosynthetic organisms on earth and generally the most abundant members of the phytoplankton community in a majority of ocean regions. Recently, our Nature Geoscience paper demonstrates that laboratory cultures and field cells (from eastern equatorial Pacific and Sargasso Sea) of Synechoccocus 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 Synechoccocus 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).
Krause, J., E. Darrow, R. Pickering, R. H. Carmichael, A. Larson, J. Basaldua.. Reactive Silica Fractions in Coastal Lagoon Sediments from the Northern Gulf of Mexico. Cont. Shelf Res. 151(2017):8-14
Baumann, M.S., Moran, S.B., Lomas, M.W., Kelly, R.P., Bell, D.W., Krause, J.W.. 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 72, 405-444, doi: 10.1357/002224014815540679
Krause, J.W., Brzezinski, M.A., Villareal, T.A., Wilson, C.. Biogenic silica cycling during summer phytoplankton blooms in the North Pacific subtropical gyre.
Wilson, C., Villareal, T.A., Brzezinski, M.A., Krause, J.W., Shcherbina, A.Y.. Chlorophyll bloom development and the Subtropical Front in the North Pacific.
Krause, J.W., Brzezinski, M.A., Siegel, D.A., Thunell, R.C.. Biogenic silica standing stock and export in the Santa Barbara Channel ecosystem.
Baines, S.B., Twining, B.S., Brzezinski, M.A., Krause, J.W., Vogt, S., Assael, D., McDaniel, H.. Significant silicon accumulation by marine picocyanobacteria.
Krause, J.W., Brzezinski, M.A., Villareal, T.A., Wilson, C.. Increased kinetic efficiency for silicic acid uptake as a driver of summer diatom blooms in the North Pacific subtropical gyre.
Villareal T.A., Brown C.G., Brzezinski M.A., Krause J.W., Wilson C.. Summer Diatom Blooms in the North Pacific Subtropical Gyre: 2008–2009.
Brzezinski, M.A., Krause, J.W., Church, M.J., Karl, D.M., Li, B., Jones, J.L., Updyke, B.. The annual silica cycle of the north Pacific subtropical gyre.
Krause, J.W., Brzezinski, M.A., Jones, J.L.. Application of low -level beta counting of 32Si for the measurement of silica production rates in aquatic environments.
Krause, J.W., Nelson, D.M., Brzezinski, M.A.,. Biogenic silica production and diatoms’ estimated contribution to primary production and nitrate uptake in the eastern equatorial Pacific Ocean.
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.. Co -limitation of diatoms by iron and silicic acid in the equatorial Pacific.
Demarest, M.S., Brzezinski, M.A., Nelson, D.M., Krause, J.W., Jones, J.L., Beucher, C.. Net biogenic silica production and nitrate regeneration determine the strength of the silica pump in the Eastern Equatorial Pacific.
Krause, J.W., Brzezinski, M.A., Landry, M.R., Baines, S.B., Nelson, D.M., Selph, K.E., Taylor, A.G., Twining, B.S.. The effects of biogenic silica detritus, zooplankton grazing, and diatom size structure on Si -cycling in the euphotic zone of the eastern equatorial Pacific.
Krause, J.W., Nelson, D.M., Lomas, M.W.. Production, dissolution, accumulation, and potential export of biogenic silica in a Sargasso Sea mode -water eddy.
Maiti, K., Benitez-Nelson, C.R., Lomas, M.W., Krause, J.W.. Biogeochemical responses to late -winter storms in the Sargasso Sea. III. Estimates of export production using 234Th:238U disequilibria and sediment traps.
Krause, J.W., Nelson, D.M., Lomas, M.W.. Biogeochemical responses to late -winter storms in the Sargasso Sea. II. Increased rates of biogenic silica production and export.
Lomas, M.W., Lipschultz, F., Nelson, D.M., Krause, J.W., Bates, N.R.. Biogeochemical responses to late -winterstorms in the Sargasso Sea. I. Pulses of primary and new production.
Krause, J.W., Lomas, M.W., Nelson, D.M.. Biogenic silica at the Bermuda Atlantic Time series Study site in the Sargasso Sea: Temporal changes and their inferred controls based on a 15 -year record.
Lomas, M.W., Roberts, N., Lipschultz, F., Krause, J.W., Nelson, D.M., Bates, N.R.. Biogeochemical responses to late -winter storms in the Sargasso Sea. IV. Rapid succession of major phytoplankton groups.
Brzezinski, M.A., Dumousseaud, C., Krause, J.W., Measures, C.I., Nelson, D.M.. Iron and silicic acid concentrations together regulate Si uptake in the equatorial Pacific Ocean.
Krause, J.W.. Silicon biogeochemistry in the open -ocean surface waters : insights from the Sargasso Sea and equatorial Pacific.
Gobler, C.J., Cullison, L.A., Koch, F., Harder, T., Krause, J.W.. Influence of freshwater flow, ocean exchange, and seasonal cycles on phytoplankton " nutrient dynamics in a temporarily open estuary.
Who We Are
Jeffrey Krause, Ph.D., 2008, Oregon State University
Senior Marine Scientist: Dauphin Island Sea Lab
Assistant Professor: University of South Alabama
Assistant Research Biologist: University of California Santa Barbara
Current Lab Members:
|Name||Institution||Dates||Lab Position (Krause Role|
|Acton, Sydney||Dauphin Island Sea Lab||Feb. 2015- present||Lab Manager (Supervisor)|
|Cole, Liesl||University of South Alabama||July 2015- present||M.S. Student (Advisor)|
|Bray, Chelsea||University of South Alabama||Aug. 2013- present||M.S. (Committee Member)|
|Dobbins, William||Dauphin Island Sea Lab||March 2016- present||Intern (Mentor)|
|Marquez, Israel||University of South Alabama||August 2015- present||Ph.D. Student (Advisor)|
|McNair, Heather||University of California Santa Barbara||June 2012- present||Ph.D. Candidate (co-Advisor)|
|Motard-Côté, Jessie||University of South Alabama||August 2011- present||Ph.D. Candidate (Committee Member)|
|Pickering-Turner, Rebecca||University of South Alabama||August 2015- present||Ph.D. Student (Advisor)|
Former Students and Interns:
|Name||Institution||Dates||Lab Position (Krause Role)|
|Anders, Jennifer||University of Alabama||August 2011 - August 2014||M.S. Student (Committee Member)|
|Andrikos, Christopher||Auburn University||August 2013 - May 2015||M.S. Student (Committee Member)|
|Basaldua, Jose||Dauphin Island Sea Lab||June 2014 - Oct 2014||Intern (Mentor)|
|Cochran, Synethia||Dauphin Island Sea Lab||Jan 2015 - March 2015||Intern (Mentor)|
|Deaton, Kelsey||University of California Santa Barbara||Sept 2010 - June 2011||Intern (Mentor)|
|Lachenmyer, Eric||Dauphin Island Sea Lab||March 2013 - Nov 2014||Lab Manager (Supervisor)|
|Larson, Ashley||Dauphin Island Sea Lab||Jan 2014 - May 2014||Intern (Mentor)|
|Lauritzen, Charisma||University of Portland||June 2015 - Aug 2015||REU Student (Mentor)|
|Marquez, Israel||University of California Santa Barbara||April 2012 - June 2013||Intern (Mentor)|
|Marquez, Israel||University of South Alabama||Aug 2013 - July 2015||M.S. Student (Advisor)|
|Medrano, Mynor||University of California Santa Barbara||June 2012 - June 2013||Intern (Mentor)|
|Williams, Collin Taylor||University of Alabama||August 2015 - Nov 2015||Intern (co-Mentor)|