Dr. Jeffrey W. Krause

Dr. Jeffrey W. Krause

Senior Marine Scientist I

Assistant Professor, University of South Alabama

Bio

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.

Previous Institutions:

Oregon State University, 2008
Assistant Professor, Department of Marine Sciences, University of South Alabama
Assistant Research Biologist, Marine Science Institute, UC Santa Barbara

Research Interest

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).

Projects

Publications

  • 2017

  • 2014

    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

  • 2013

    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.

  • 2012

    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.

  • 2011

    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.

  • 2010

    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.

  • 2009

    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.

  • 2008

    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.

  • 2005

    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

Principal Investigator: 

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)

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