Jonathan P. Zehr Professor of Ocean Sciences Ocean Sciences Department University of California Santa Cruz, CA 95064 Office: Earth & Marine Sciences A-438 Tel: (831) 459-4009 Fax: (831) 459-4882 Email: zehrj@ucsc.edu Other website(s):   Zehr Laboratory

Curriculum Vitae

• Positions Held
• Education & Professional Activities
• Recent Research Publications
• Research Support
• Sponsored Student Research
• Teaching Assignments

POSITIONS HELD

2005-2008	Adjunct Scientist, Monterey Bay Aquarium Research Institute (MBARI)
1999-present	Professor of Ocean Sciences, University of California, Santa Cruz
1995-1999	Associate Professor of Biology, Rensselaer Polytechnic Institute, New York
1992-1995	Assistant Professor of Biology, Rensselaer Polytechnic Institute, New York
1993- 1999	Associate Director, Darrin Fresh Water Institute, Rensselaer Polytechnic Institute, New York
1987-1992	Research Assistant Professor, State University of New York, Stony Brook, New York
1990	Visiting Scientist, Department of Cell Biology, National Institute of Basic Biology, Okazaki, Japan
1988-1990	Postdoctoral Research Associate, New England Biolabs, Inc., Beverly, Massachusetts
1986-1988	Research Collaborator, Brookhaven National Laboratory, Upton, New York
1986	Postdoctoral Research Associate, State University of New York, Stony Brook, New York
1985-1986	USGS Research Associate, National Research Council, U.S. Geological Survey, Menlo Park, California
1981-1985	Graduate Research Assistant, University of California, Davis, California
1978-1981	Research Aide, Western Washington University, Bellingham, Washington

EDUCATION

1985	University of California, Davis, CA Ph.D. in Ecology-Limnology Thesis Title:  Dissolved Organic Nitrogen Dynamics and Bacterial Amino Acid Metabolism in Castle Lake, California Advisor:  Charles R. Goldman
1981	Western Washington University, Bellingham, WA B.S. in Biology

PROFESSIONAL ACTIVITIES

Membership in Professional Societies

American Society of Limnology and Oceanography. Member. American Society for Microbiology. Member. Phycological Society of America. Member. American Association for the Advancement of Science. Member. American Chemical Society. Member.

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Honors and Awards

2004-2009	Gordon and Betty Moore Investigator in Marine Microbiology
1998-2000	Editorial Board of Applied and Environmental Microbiology, the American Society of Microbiology
1996	Distinguished Visiting Lecturer, Texas A&M University, College Station, Texas
1985-1986	National Research Council Research Associateship
1983	Jastro-Shields Research Fellowship, University of California, Davis, California
1981-1984	National Science Foundation Predoctoral Fellowship
1981	Outstanding Student in Biology, Western Washington University

RECENT RESEARCH PUBLICATIONS

Chapters in press

Zehr, J. P. and H. W. Paerl. In Press. Biological nitrogen fixation in the marine environment. In D. L. Kirchman (ed.) Microbial Ecology of the Oceans. 2nd Edition. Wiley-Liss, Inc.

Stal, L. J. and J. P. Zehr. In Press. Cyanobacterial nitrogen fixation in the ocean. Diversity, regulation and ecology.  In A. Herrero and E. Flores (eds) Cyanobacteria: Molecular Biology, Genomics and Evolution. Horizon Scientific Press.

Jenkins, B. D., and J. P. Zehr. In Press. Molecular approaches to the nitrogen cycle. In D. Bronk, M. Mulholland, D. Capone and E. Carpenter (eds). Nitrogen in the Marine Environment. Academic Press.

Karl, D. M., Bidigare, R. R., Church, M. J., Dore, J. E., Letelier, R. M., Mahaffey, C., and Zehr, J. P. In Press. Station ALOHA: An oceanic outpost for investigations of the nitrogen cycle. In Nitrogen in the Marine Environment. Bronk, D., Mulholland, M.R., Capone, D., and Carpenter, E.J. (eds): Academic Press.

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Chapters published  (Selected)

Zehr, J. P. and J. P. Montoya. 2007. Measuring N2 fixation in the field. In H. Bothe, S. Ferguson, and W. E. Newton (eds.) Biology of the Nitrogen Cycle. Elsevier B.V. pp. 193-205

Zehr, J. P., Methe’, B. A. and R. Foster. 2005. New nitrogen-fixing microorganisms from the oceans: Biological aspects and global implications. In Y.-P. Wang, M. Lin, Z.-X. Tian, C. Elmerich, W. E. Newton (eds.) Biological Nitrogen Fixation, Sustainable Agriculture and the Environment. Proceedings of the 14th International Nitrogen Fixation Congress. Current Plant Science and Biotechnology in Agriculture. pp. 361-365.

Zehr, J. P., Church, M. J., and P. H. Moisander. 2005. Diversity, distribution and biogeochemical significance of nitrogen-fixing microorganisms in anoxic and suboxic ocean environments. In L. Neretin (ed.) NATO Series book on past and present water column anoxia. Kluwer.

Short, S. M. and J. P. Zehr 2005. Quantitative analysis of nifH genes and transcripts from aquatic environments. In J. Leadbetter (ed.) Methods in Enzymology (Environmental Microbiology). Elsevier.

Zehr, J. P. and D. G. Capone. 2002. N-2 fixation in the marine environment. In G. Bitton (ed.) Encyclopedia of Environmental Microbiology. John Wiley & Sons. pp. 2211-2221.

Zehr, J. P. and P. J. Turner. 2001. Nitrogen fixation: Nitrogenase genes and gene expression. In J. H. Paul (ed.) Methods In Marine Microbiology. Academic Press, New York.

Zehr, J. P. and D. G. Capone. 2000. Ecology and molecular biology of Trichodesmium. In E. W. Triplett (ed.) Prokaryotic Nitrogen Fixation: A Model System for the Analysis of a Biological Process.

Paerl, H. W. and J. P. Zehr. 2000. Marine nitrogen fixation. In D. L. Kirchman (ed.) Microbial Ecology of the Oceans. Wiley-Liss, Inc.

Ehrlich, H. L., Oremland, R. S., and J. P. Zehr. 2000. Biogeochemical cycles. In Encyclopedia of Life Sciences. Macmillan Reference, Ltd. London. (Electronic version published in 2000).

Zehr, J. P. and M. Voytek. 1999. Molecular Biology of Aquatic Communities. [Editors]. Hydrobiologia/Developments in Hydrobiologia Volume 138. Kluwer Publishers. Amsterdam. 288 p. ISBN 0-7923-5933-X.

Zehr, J. P., B. Dominic, Chen, Y.-B. and M. Mellon. 1999. Molecular biology of nitrogen fixation in the marine cyanobacterium Trichodesmium. In The Phototrophic Prokaryotes. G. A. Peschek, W. Loffelhardt, and G. Schmetterer [ed.]. Plenum Press. New York.

Zehr, J.P. and H.W. Paerl.  1998.  Molecular aspects of nitrogen fixation in the sea.  In:  Molecular Approaches to the Study of the Ocean.  K.E. Cooksey [ed.].  Chapman and Hall.

Zehr, J.P. and W. Hiorns.  1998.  Molecular approaches for assessing activities of marine organisms.  In:  Molecular Approaches to the Study of the Ocean.  K.E. Cooksey [ed.].  Chapman and Hall.

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Recent Journal Articles    (Selected)

Manuscripts in preparation

Needoba, J. A., Foster, R.A. Zehr, J. P. and K. S. Johnson. N2-fixation by unicellular cyanobacterial diazotrophs in the temperate, oligotrophic North Pacific. Marine Ecology-Progress Series.

Bonnet, S., Guieu, C., Bruyant, F., Prasil, O., Raimbault, P., Van Wambeke, F., Gorbunov, M., Zehr, J., Grob, C. Masquelier, S., Garczareck, S., Moutin, T., Claustre, H. Nutrients controlling primary productivity in the South East Pacific. Biogeosciences.

Foster, R.A., and J.P. Zehr. Calothrix rhizosoleniae SC01: a new cultured isolate from Chaetoceros compressus chains of the N. Pacific Ocean active and asymbiotic in N-free media.

Montoya, J. P., Hansen, A., Karl, D. M. and J. P. Zehr. Size-fractionated rates and patterns of N2-fixation in the North Pacific Subtropical Gyre. Appl. Environ. Microbiol.

Manuscripts submitted

Zehr, J. P., Bench, S., Mondragon, E., J. McCarren and E. F. DeLong. Submitted. Remarkable genome sequence conservation in globally distributed marine N2-fixing cyanobacteria. PNAS.

Bonnet, S. C. Guieu, F. Bruyant, O. Prasil, P. Raimbault, M. Gorbunov, J.P. Zehr, C. Grob, S. M. Masquelier, S. Blain, T. Moutin, F. Van Wambeke, and H. Claustre. Submitted. The unique nutritional status of the hyper-oligotrophic South Pacific Gyre. Nature.

Church, M. J., Bjorkman, K. M., Karl, D. M., Saito, M. A. and J. P. Zehr. Submitted. Latitudinal variations in the distribution of nitrogen-fixing bacteria in the North Pacific Ocean. Limnology and Oceanography.

Moisander, P. H., Morrison, A. E., Ward, B. B., Jenkins, B. D. and J. P. Zehr. Submitted. Spatial-temporal variability in diazotroph assemblages in Chesapeake Bay using an oligonucleotide nifH microarray. Environ. Microbiol.

Foster, R. A., Payton, A. and J. P. Zehr. Submitted. N2 fixation and nifH gene diversity in the Gulf of Aqaba (Red Sea) during fall 2005. Marine Ecology-Progress Series.

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Manuscripts in press

Zehr, J. P. and H. W. Paerl. In Press. Biological nitrogen fixation in the marine environment. In D. L. Kirchman (ed.) Microbial Ecology of the Oceans. 2nd Edition. Wiley-Liss, Inc.

Stal, L. J. and J. P. Zehr. In Press. Cyanobacterial nitrogen fixation in the ocean. Diversity, regulation and ecology.  In A. Herrero and E. Flores (eds) Cyanobacteria: Molecular Biology, Genomics and Evolution. Horizon Scientific Press.

Jenkins, B. D., and J. P. Zehr. In Press. Molecular approaches to the nitrogen cycle. In D. Bronk, M. Mulholland, D. Capone and E. Carpenter (eds). Nitrogen in the Marine Environment. Academic Press.

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Published  (Since 2000)

Foster, R. A., Capone, D.G., Carpenter, E. J., Mahaffey, C., Subramaniam, A. and J. P. Zehr. 2007. Influence of the Amazon River Plume on distributions of free-living and symbiotic cyanobacteria in the Western Tropical North Atlantic Ocean. Limnology and Oceanography online  52(2): xx-xx.

Short, S. M. and J. P. Zehr. 2007. Nitrogenase gene expression in the Chesapeake Bay Estuary. Environmental Microbiology online doi: 10.1111/j.1462-2920.01258.x

Hewson, I., Moisander, P. H., Achilles, K. M., Carlson, C. A., Jenkins, B. D., Mondragon, E. A., Morrison, A. E., Zehr, J. P. 2007. Characteristics of diazotrophs in surface to abyssopelagic waters of the Sargasso Sea. Aquatic Microbial Ecology. 46: 15-30.

Zehr, J. P., Montoya, J. P., Hewson, I., Mondragon, E., Short, C. M., Hansen, A., Jenkins, B. D., Church, M. J., and D. M. Karl. 2007. Experiments linking nitrogenase gene expression to nitrogen fixation in the North Pacific Subtropical Gyre. Limnology and Oceanography 52 (1): 169-183.

Jenkins, B. D., Zehr, J. P., Gibson, A., Campbell, L. 2006. Cyanobacterial assimilatory nitrate reductase gene diversity in coastal and oligotrophic marine environments. Environmental Microbiology. 8 (12): 2083-2095.

Foster, R. A. and J. P. Zehr. 2006. Characterization of diatom-cyanobacteria symbioses on the basis of nifH, hetR, and 16S rRNA sequences. Environmental Microbiology 8 (11): 1913-1925.

Moisander, P. H. Shiue, L., Steward, G. F., Jenkins, B. D., Bebout, B. M., and J. P. Zehr. 2006. Application of a nifH oligonucleotide microarray for profiling diversity of N2-fixing microorganisms in marine microbial mats. Environmental Microbiology 8 (10): 1721-1735.

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Burns, J. A., Zehr, J. P., Montoya, J. P., Kustka, A. and D. G. Capone. 2006. Effect of EDTA additions on natural Trichodesmium spp. (Cyanophyta) populations. Journal of Phycology 42: 900-904.

Gibson, A. H., Jenkins, B. D., Wilkerson, F., Short, S. M. and J. P. Zehr. 2006. Characterization of cyanobacterial glnAgene diversity and gene expression in marine environments. FEMS Microbiol. Ecol. 55: 391-402.

Church, M. J., Short, C. M., Jenkins, B. D., Karl, D. M. and J. P. Zehr. 2005. Temporal patterns of nitrogenase gene (nifH) expression in the oligotrophic North Pacific Ocean. Applied and Environmental Microbiology. 71: 5362-5370.

Church, M. J., B. D. Jenkins, D. M. Karl, and J. P. Zehr. 2005. Vertical distributions of nitrogen-fixing phylotypes at Station ALOHA in the oligotrophic North Pacific Ocean. Aquatic Microbial Ecology 38: 3-14. (evaluated by Faculty of 1000).

Montoya, J. P., Holl, C. M., Zehr, J. P., Hansen, A., Villareal, T. A., and D. G. Capone. 2004. High rates of N2 fixation by unicellular diazotrophs in the oligotrophic Pacific Ocean. Nature 430:1027-1032.

Short, S. M., Jenkins, B. D., and J. P. Zehr. 2004. Spatial and temporal distribution of two diazotrophic bacteria in the Chesapeake Bay. Applied and Environmental Microbiology. 70: 2186-2192.

Jenkins, B. D., Steward, G. F., Short, S. M. Ward, B. B. and J. P. Zehr. 2004. Fingerprinting diazotroph communities in the Chesapeake Bay by using a DNA macroarray. Applied and Environmental Microbiology. 70: 1767-1776.

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Steward, B. D., Jenkins, B. D., Ward, B. B. and J. P. Zehr. 2004. Development and testing of a DNA macroarray to assess nitrogenase (nifH) gene diversity. Applied and Environmental Microbiology. 70: 1455-1465.

Omoregie, E. O., Crumbliss, L. L., Bebout, B. M. and J. P. Zehr. 2004. Determination of nitrogen-fixing phylotypes in Lyngbya sp. and Microcoleus chthonoplastes cyanobacterial mats from Guerrero Negro Mexico. Applied and Environmental Microbiology. 70: 2119-2128.

Omoregie, E. O., Crumbliss, L., Bebout, B. M., and J. P. Zehr. 2004. Comparison of diazotroph community structure in Lyngbya and Microcoleus dominated microbial mats from Guerrero Negro, Baja, Mexico. FEMS Microbiology Ecology. 1615: 1-14.

Steward, G. F., Zehr, J. P., Jellison, R., Montoya, J. P. and J. T. Hollibaugh. 2004. Vertical distribution of nitrogen-fixing phylotypes in a meromictic, hypersaline lake. Microbial Ecology. 47: 30-40.

Zehr, J. P., Crumbliss, L.L., Church, M. J., Omoregie, E. O., and B.D. Jenkins. 2003. Nitrogenase genes in PCR and RT-PCR reagents and implications for studies of diverse functional genes. BioTechniques. 35: 996-1005.

Karouna-Renier, N.and J. P. Zehr. 2003.Short-term exposures to chronically toxic copper concentrations induce HSP70 proteins in midge larvae (Chironomus tentans). The Science of the Total Environment. 312: 267-272.

Zehr, J.P., Jenkins, B.D., Short, S.M., and G. F. Steward. 2003. Nitrogenase gene diversity and microbial community structure: a cross-system comparison. Environmental Microbiology. 5: 539-554.

Burns, J. A., Capone, D. G., and J. P. Zehr. 2002. Nitrogen-fixing phylotypes of Chesapeake Bay and Neuse River estuary sediments. Microbial Ecology. 44: 336-343.

Zehr, J. P. and B. B. Ward. 2002. Nitrogen cycling in the ocean: New perspectives on processes and paradigms. Applied and Environmental Microbiology. 68: 1015-1024.

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Allen, A. E., Booth, M. G., Frischer, M. E. Verity, P. G., Zehr, J. P., and S. Zani. 2001. Diversity and detection of nitrate assimilation genes in marine bacteria. Applied and Environmental Microbiology. 67: 5343-5348.

Zehr, J. P., Waterbury, J. B., Turner, P. J., Montoya, J. P., Omoregie, E., Steward, G. F., Hansen, A., and D. M. Karl. 2001. Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean. Nature. 412: 635-638.

MacGregor, B. J., Van Mooy, B., Baker, B. J., Mellon, M., Moisander, P. H., Paerl, H. W., Zehr, J. , Hollander, D. and D. A. Stahl. 2001. Microbiological, molecular biological, and stable isotopic evidence for nitrogen fixation in the open waters of Lake Michigan. Environmental Microbiology. 3: 205-219.

Affourtit, J., Zehr, J. P., and H. W. Paerl. 2001. Distribution of nitrogen-fixing microorganisms along the Neuse River Estuary, North Carolina. Microbial Ecology. 41: 114-123.

Zani, S., Mellon, M. T., Collier, J., and J. P. Zehr. 2000. Expression of nifH genes in natural microbial assemblages in Lake George, New York, detected by reverse transcriptase PCR. Applied and Environmental Microbiology 66: 3119-3124.

Dominic, B., Zani, S., Chen, Y.-B., Mellon, M. T. and J. P. Zehr. 2000. Organization of the nif genes of the nonheterocystous cyanobacterium Trichodesmium sp. IMS101. Journal of Phycology 36: 693-701.

Zehr, J. P., Carpenter, E. J. and T. A. Villareal. 2000. New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceans. Trends in Microbiology. 8: 68-73.

Zehr, J. P. and M. A. Voytek. 1999. Molecular ecology of aquatic communities: Reflections and future directions. Hydrobiologia 401: 1-8

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Abstracts   (partial list of major abstracts)

Goebel, N. L., Edwards, C. A., Church, M. J., Achilles, K. M., and J. P. Zehr. Relative Contribution Of Three Cyanobacteria Phylotypes To Total Nitrogen (N2) Fixation At Station Aloha.  ASLO Aquatic Sciences Meeting. Santa Fe, NM. Feb 4-9, 2007.

Pennebaker, K. M., Mondragon, E., Rabouille, S., van den Engh, G. and Zehr, J. P. (poster) Circadian Expression of NifH in Crocosphaera watsonii WH 8501 and Proposed Relationship with Chromosome Compaction. ASLO Aquatic Sciences Meeting. Santa Fe, NM. Feb 4-9, 2007.

Rabouille, S.  ASLO Aquatic Sciences Meeting. Santa Fe, NM. Feb 4-9, 2007.

Hewson, I. and J. P. Zehr. (poster) Assessment of a novel targeted long-range amplification and large-construct library approach to study the genomics of uncultured marine diazotrophs, the group A cyanobacteria.  International Society for Microbial Ecology (ISME), 11th symposium.  Vienna, Austria. Aug. 20-26, 2006.

Moisander, P.H., Hewson, I., Morrison, A.E., and J. P. Zehr. (poster)Diversity and expression of nifH in oceanic waters using a 768-probe microarray and comparisons with qPCR and qRT-PCR  International Society for Microbial Ecology (ISME), 11th symposium.  Vienna, Austria. Aug. 20-26, 2006.

Bench, S, Mondragon, E., DeLong, E., J.P. Zehr.  (poster) identification of Marine Nitrogen Fixing Cyanobacteria Though Analysis of Environmental DNA Sequences.  International Society for Microbial Ecology (ISME), 11th symposium.  Vienna, Austria. Aug. 20-26, 2006.

Moisander, P.H., Morrison, A.E., Ward, B.W., Bebout, B.M., Zehr J.P. Characterization of spatial-temporal variability in diazotroph assemblages in the Chesapeake Bay using a high-density oligonucleotide nifH microarray.  American Society of Microbiology General Meeting. Orlando, FL, USA.  May, 2006.

Foster, R. A. and J. P. Zehr.  Diatom-Richelia Diversity, Distribution, and Cultivation. American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI.  February 20-24, 2006.

Fong, A. A., Church, M. J., Karl, D. M., Lukas, R., Mahaffey, C., and J. P. Zehr.  Diazotroph Abundance and Diversity During a Large Bloom in the Oligotrophic North Pacific Gyre. American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI.  February 20-24, 2006.

Church, M. J., Mahaffey, C., Fong, A. A., J. P. Zehr and D. M. Karl.  Time Series Investigations into the Dynamics of Nitrogen Fixing Bacteria and Rates of Nitrogen Fixation at Station ALOHA. American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI.  February 20-24, 2006.

Haddock, Traci, Zehr, J. P. and Jenkins, B. Shifts in cyanobacterial community composition revealed by comparison of assimilatory nitrate reductase sequences. American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI.  February 20-24, 2006.

Hewson, I., K.A. Achilles, C.A. Carlson, B.D. Jenkins, P.H. Moisander, E.A. Mondragon, A.E. Morrison, J.P. Zehr. Insights into diazotroph ecology at Hydrostation S (North Atlantic Ocean) based upon culture-independent approaches” American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI.  February 20-24, 2006.

Montoya, J.P., Hansen, A., Karl, D.M. and J. P. Zehr. 2006. Size-Fractionated Rates and Patterns of Nitrogen and Carbon Fixation in the North Pacific Subtropical Gyre. American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI USA.  February 20-24, 2006.

Zehr, J.P. Montoya, J. P., Short, C., Hansen, A., Jenkins, B. D., Church, M. J. and D. M. Karl. 2006. Nitrogenase Gene Expression in the North Pacific Subtropical Gyre. American Geophysical Union/American Society of Limnology and Oceanography. Honolulu, HI.  February 20-24, 2006.

Zehr, J.P., DeLong, E., Church, M., Short, C., Mondragon, E., Jenkins, B. 2005. Nitrogen Fixation by Nanoplankton in the Open Ocean: New Players Playing By New Rules? American Society for Limnology and Oceanography. Santiago de la Compostela, Spain. (Invited).

Foster, R. A., Jenkins, B. D., and J. P. Zehr. Diverse Microbial assemblages cultivated under diazotrophic conditions. American Society for Limnology and Oceanography. Santiago de la Compostela, Spain.

Clemente, T. Bjorkman, K., Dafner, E., Fujieki, L., Jachowski, N., Sadler, D., Corno, G., Letelier, R., Church, M., Zehr, J. and Karl, D. 2004. Regionalization of the Hawaii Ocean Time-series (HOT) Observations. The Oceanographic Society (TOS) and American Society for Limnology and Oceanography (ASLO) Ocean Research Conference. Honolulu, HI.

Zehr, J. P., Jenkins, B. D., Steward, G. F., Ward, B. B., and Jackson, G. 2003. Biocomplexity, Bioinformatics and Micromanagement of Microarrays of Nitrogenase Genes. American Society for Limnology and Oceanography. Salt Lake City, Utah.

Steward, G. F., Zehr, J. P., Jenkins, B. D., Montoya, J. P., Jellison, R. S., Hollibaugh, J. T. 2003. Diverse Nitrogen-Fixer, But Undectable Nitrogen Fixation in Alkaline, Hypersaline, Meromictic Mono Lake, California. American Society for Limnology and Oceanography. Salt Lake City, Utah.

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Montoya, J.P., J.P. Zehr, and D.G. Capone. 2002. Rates and Patterns of Nitrogen Fixation by Unicellular Cyanobacteria in Pelagic Waters. American Society for Limnology and Oceanography Ocean Science Meeting.

Zehr, J. P. 2002. Nitrogen Assimilation: from Genomes to Gene Expression in the Oceans. American Society for Limnology and Oceanography Ocean Science Meeting.

Burns, J. A., Zehr, J. P. and D. G. Capone. Effect of EDTA Additions on Natural Trichodesmium spp. Populations. American Society for Limnology and Oceanography Ocean Science Meeting.

Jenkins, B.D., Gibson, A., Cano, A.,  Wilkerson, F. and J.P. Zehr. 2002. Diversity of Cyanobacterial Nitrate Reductase and Development of Molecular Probes for Nitrogen Assimilation Genes.  American Society for Limnology and Oceanography Ocean Science Meeting.

Steward, G.F., Stephens, A., Jenkins, B. and J.P. Zehr. Bioinformatics and DNA Arrays for Investigating the Molecular Ecology of Nitrogen Fixation. American Society for Limnology and Oceanography Ocean Science Meeting.

Ray, M. and J. P. Zehr. 2001. Amplification of Cyanobacterial narB Genes from Oceanic Plankton, and Implications for Nitrogen Assimilation. Aquatic Sciences Meeting, American Society for Limnology and Oceanography, Albuquerque, New Mexico.

Steward, G.F., Jellison, R.S., Hollibaugh, J.T., Joye, S.B., and Zehr, J.P. 2001. Detection of Novel and Diverse Nitrogenase Genes Suggests Potential for Pelagic Diazotrophy in Alkaline, Hypersaline Mono Lake. Aquatic Sciences Meeting, American Society for Limnology and Oceanography, Albuquerque, New Mexico.

Zehr, J. P., Turner, P. J., Omoregie, E.,  Hansen, A., Steward, G. F., Montoya, J. P.,   Tupas, L., Karl, D. M.  Nitrogenase Gene Expression in the North Pacific Gyre. Aquatic Sciences Meeting, American Society for Limnology and Oceanography, Albuquerque, New Mexico.

Kirshtein, J. D., Turner, P. J., Paerl, H. W. and Zehr, J. P. 2000.  Distribution of Nitrogen-Fixing Phylotypes Along a Salinity Gradient in the Neuse River, North Carolina. American Society for Microbiology Annual Meeting. Los Angeles.

Booth, M.G., Allen, A.E., Frischer, M.E., Verity, P.G., Bronk, D.A., and Zehr, J. P. 2000. The Genetic Diversity of the Assimilatory Nitrate Reductase Gene in Heterotrophic Marine Bacterioplankton. American Society for Microbiology Annual Meeting. Los Angeles.

Zehr, J. P. 2000. Secret Ingredients of the New Nitrogen Cycle: are Other Nitrogen Fixers Important in the Open Ocean? American Society of Limnology and Oceanography and American Geophysical Union Ocean Sciences Meeting. San Antonio, Texas.

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