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

Books, Monographs

Chapters published

Zehr, J.P. and H.W. Paerl. 2008. 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. 2008. 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. 2008. 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., R.R. Bidigare, M.J. Church, J.E. Dore, R.M. Letelier, C. Mahaffey, and J.P. Zehr. 2008. 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.

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. pp. 193-205.

Zehr, J.P., Methé, 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 o fthe 14th International Nitrogen Fixation Congress. Current Plant Science and Biotechnology in Agriculture. Springer, Dordrecht. pp. 361-365.

Zehr, J.P., M.J. Church, 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. Springer. pp. 337-369.

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. pp. 380-394.

Zehr, J.P. and D.G. Capone. 2002. N2 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.

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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., R.S. Oremland, 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, Y.-B. Chen, 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.

Zehr, J.P. 1995. Nitrogen fixation in the sea: Why only Trichodesmium? In: Molecular Ecology of Aquatic Microbes. I. Joint [ed.]. NATO ASI Series. Springer Verlag, Berlin.

Ohki, K., J.P. Zehr, and Y. Fujita. 1992. Trichodesmium: Establishment of culture and characteristics of N2-fixation. In: Marine Pelagic Cyanobacteria: Trichodesmium and Other Diazotrophs. E.J. Carpenter, D.G. Capone, and J.G. Rueter [eds.]. Kluwer Academic Publishers, Dordrecht, pp. 307-318.

Zehr, J.P. 1992. Molecular biology of nitrogen fixation in natural populations of marine cyanobacteria. In: Marine Pelagic Cyanobacteria: Trichodesmium and Other Diazotrophs. E.J. Carpenter, D.G. Capone, and J.G. Rueter [eds.]. Kluwer Academic Publishers, Dordrecht, pp. 249-264.

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Journal Articles

Manuscripts in press

 

Manuscripts published

Zehr, J.P., S.R. Bench, B.J. Carter, I. Hewson, F. Niazi, T. Shi, H.J. Tripp, J.P Affourtit. 2008. Globally distributed uncultivated oceanic N-2-fixing cyanobacteria lack oxygenic Photosystem II. Science 322:1110-1112.
Abstract Full Text

Paerl, R.W., R.A. Foster, B.D. Jenkins, J.P. Montoya, J. P. Zehr. 2008. Phylogenetic diversity of cyanobacterial narB genes from various marine habitats. Environmental Microbiology 10:3377-3387

Moisander, P.H., H.W. Paerl, and J.P. Zehr. 2008. Effects of inorganic nitrogen on taxa-specific cyanobacterial growth and nifH expression in a subtropical estuary. Limnology and Oceanography 53:2519-2532

Goebel, N.L., C.A. Edwards, B.J. Carter, K.M. Achilles, and J.P. Zehr. 2008. Growth and carbon content of three different sized diazotrophic cyanobacteria observed in the subtropical North Pacific. Journal of Phycology 44:1212-1220

Moisander, P.H., R.A. Beinart, M. Voss, and J.P. Zehr. 2008. Diversity and abundance of diazotrophic microorganisms in the South China Sea during intermonsoon. The ISME Journal 2:954-967

Fong, A.A., D.M. Karl, R. Lukas, R.M. Letelier, J.P. Zehr, and M.J. Church. 2008. Nitrogen fixation in an anticyclonic eddy in the oligotrophic North Pacific Ocean. The ISME Journal 2:663-676

Church, M.J., K.M. Bjorkman, D.M. Karl, M.A. Saito, and J.P. Zehr. 2008. Regional distributions of nitrogen-fixing bacteria in the Pacific Ocean. Limnology and Oceanography 53:63-77

Bonnet S., C. Guieu, F. Bruyant, O. Prasil, F. Van Wambeke, P. Raimbault, T. Moutin, C. Grob, M.Y. Gorbunov, J.P. Zehr, S.M. Masquelier, L. Garczarek, and H. Claustre. 2008. Nutrient limitation of primary productivity in the Southeast Pacific (BIOSOPE cruise). Biogeosciences 5:215-225

Zehr, J.P., S.R. Bench, E.A. Mondragon, J. McCarren, and E.F. DeLong. 2007. Low genomic diversity in tropical oceanic N2-fixing cyanobacteria. Proceedings of the National Academy of Sciences of the United States of America 104:17807-17812.

Goebel, N. L., C.A. Edwards, M.J. Church, and J.P. Zehr. 2007. Modeled contributions of three types of diazotrophs to nitrogen fixation at station ALOHA. The ISME Journal 1:606-619.

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Rabouille S., C.A. Edwards, and J.P. Zehr. 2007. Modelling the vertical distribution of Prochlorococcus and Synechococcus in the North Pacific subtropical ocean. Environmental Microbiology 9:2588-2602.

Needoba, J.A., R.A. Foster, C. Sakamoto, J.P. Zehr, and K.S. Johnson. 2007. Nitrogen fixation by unicellular cyanobacteria in the temperate oligotrophic North Pacific Ocean. Limnology and Oceanography 52:1317-1327.

Hewson, I., P.H. Moisander, A.E. Morrison, and J.P. Zehr. 2007. Diazotrophic bacterioplankton in a coral reef lagoon: Phylogeny, diel expression, and response to phosphate enrichment. The ISME Journal 1:78-91.

Moisander, P.H., A.E. Morrison, B.B. Ward, B.D. Jenkins, and J.P. Zehr. 2007. Spatial-temporal variability in diazotroph assemblages in Chesapeake Bay using an oligonucleotide nifH microarray. Environmental Microbiology 9:1823-1835.

Foster, R.A., D.G. Capone, E.J. Carpenter, C. Mahaffey, A. Subramaniam, 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 52: 517-532.

Short, S.M. and J.P. Zehr. 2007. Nitrogenase gene expression in the Chesapeake Bay Estuary. Environmental Microbiology 9:1591-1596

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

Zehr, J.P., J.P. Montoya, I. Hewson, E. Mondragon, C.M. Short, A. Hansen, B.D. Jenkins, M.J. Church, 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.

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.

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

Moisander, P.H. L. Shiue, G.F. Steward, B.D. Jenkins, B.M. Bebout, 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., J.P. Zehr, J.P. Montoya, A. Kustka, and D.G. Capone. 2006. Effect of EDTA additions on natural Trichodesmium spp. (Cyanophyta) populations. Journal of Phycology 42: 900-904.

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

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

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

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

Burns, J.A., D.G. Capone, 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.

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

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

MacGregor, B.J., B. Van Mooy, B.J. Baker, M. Mellon, P.H. Moisander, H.W. Paerl, J. Zehr, D. Hollander, 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., J.P. Zehr, and H.W. Paerl. 2001. Distribution of nitrogen-fixing microorganisms along the Neuse River Estuary, North Carolina. Microbial Ecology. 41: 114-123.

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

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Zehr, J. P., E.J. Carpenter, 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.

Chen, Y.B., B. Dominic, S. Zani, M.T. Mellon, and J. P. Zehr. 1999. Expression of photosynthesis genes in relation to nitrogen fixation in the diazotrophic filamentous nonheterocystous cyanobacterium Trichodesmium sp. IMS 101. Plant Molecular Biology. 41: 89-104.

Karouna-Renier, N.K., and J.P. Zehr. 1999. Ecological implications of molecular biomarkers: assaying sub-lethal stress in the midge Chironomus tentans using heat shock protein 70 (HSP-70) expression. Hydrobiologia 401: 255-264.

Methé, B.A. and J.P. Zehr. 1999. Diversity of bacterial communities in diverse Adirondack lakes: do species assemblages reflect lake water chemistry? Hydrobiologia 401: 77-96.

Momen, B., J.P. Zehr, C.W. Boylen, and J.W. Sutherland. 1999. Determinants of summer nitrate concentration in a set of Adirondack lakes, New York. Water, Air and Soil Pollution. 111: 19-28.

Sullivan, T.J., D.F. Charles, J.A. Bernert, B. McMartin, K.B. Vaché, and J. Zehr. 1999. Relationship between landscape characteristics, history, and lakewater acidification in the Adirondack Mountains, New York. Water Air and Soil Pollution. 112: 407-427.

Braun, S.T., L.M. Proctor, S. Zani, M.T. Mellon, and J.P. Zehr. 1999. Molecular evidence for zooplankton-associated nitrogen-fixing anaerobes based on amplification of the nifH gene. FEMS Microbiology Ecology 28: 273-279.

Manson, J.R., T.D. DiStefano, and J.P. Zehr. 1999. Environmental engineers and environmental science: Comparative approaches in practice, research and education. Journal of Environmental Engineering - ASCE. 125: 5-6.

Dominic, B., Y.-B. Chen, and J.P. Zehr. 1998. Cloning and transcriptional analysis of the nifUHDK operon reveals stable nifD, nifDK and nifK transcripts in Trichodesmium sp. IMS 101. Microbiology 144: 3359-3368.

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Zwart, G., W.D. Hiorns, B.A. Methé, M.P. Van Agterveld, R. Huismans, S.C. Nold, J.P. Zehr, and H.J. Laanbroek. 1998. Near-identical 16S rRNA sequences recovered from lakes in North America and Europe indicate the existence of clades of globally distributed freshwater bacteria. Systematic and Applied Microbiology 21:546-556.

Zehr, J.P., M.T. Mellon, and S. Zani. 1998. New nitrogen-fixing microorganisms detected in oligotrophic oceans by amplification of nitrogenase (nifH) genes (vol 64, pg 3444, 1998). Applied and Environmental Microbiology 64: 5067-5067. (Erratum)

Zehr, J.P., M.T. Mellon, and S. Zani. 1998. New nitrogen-fixing microorganisms detected in oligotrophic oceans by amplification of nitrogenase (nifH) genes. Applied and Environmental Microbiology 64: 3444-3450.

Chen, Y.B., B. Dominic, M.T. Mellon, and J.P. Zehr. 1998. Circadian rhythm of nitrogenase gene expression in the diazotrophic filamentous nonheterocystous Cyanobacterium Trichodesmium sp. Strain IMS 101. Journal of Bacteriology 180: 3598-3605.

Methé, B.A., W.D. Hiorns, and J.P. Zehr. 1998. Contrasts between marine and freshwater bacterial community composition: Analyses of communities in Lake George and six other Adirondack lakes. Limnology and Oceanography. 43:368-374.

Momen, B. and J.P. Zehr. 1998. Watershed classification by discriminant analyses of lakewater-chemistry and terrestrial characteristics. Ecological Applications 8: 497-507.

Hare, J.A., R.K. Cowen, J.P. Zehr, F. Juanes, and K.H. Day. 1998. A correction to: Biological and oceanographic insights from larval labrid (Pisces: Labridae) identification using mtDNA sequences. Marine Biology 130: 589-592.

Zehr, J.P., D. Harris, B. Dominic, and J. Salerno. 1997. Structural analysis of the Trichodesmium nitrogenase iron protein: implications for aerobic nitrogen fixation activity. FEMS Microbiology Letters 153: 303-309.

Hiorns, W.D., B.A. Methé, S.A. Nierzwicki-Bauer, and J.P. Zehr. 1997. Bacterial diversity in Adirondack Mountain lakes as revealed by 16S rRNA gene sequences. Applied and Environmental Microbiology. 63: 2957-2960.

Capone, D.G., J.P. Zehr, H.W. Paerl, B. Bergman, and E.J. Carpenter. 1997. Trichodesmium, a globally significant marine cyanobacterium. Science 276: 1221-1229.

Zehr, J.P., M.T. Mellon, and W.D. Hiorns. 1997. Phylogeny of cyanobacterial nifH genes: Evolutionary implications and potential applications to natural assemblages. Microbiology-(UK) 143: 1443-1450.

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Momen, B., L.W. Eichler, C.W. Boylen, and J.P. Zehr. 1997. Are recent watershed disturbances associated with temporal and spatial changes in water quality of Lake George, New York? Environmental Management 21: 725-732.

Momen, B., L.W. Eichler, C.W. Boylen, and J.P. Zehr. 1996. Application of multivariate statistics in detecting temporal and spatial patterns of water chemistry in Lake George, New York. Ecological Modelling 91:183-192.

Kramer, J.G., M. Wyman, J.P. Zehr, and D.G. Capone. 1996. Diel variability in transcription of the structural gene for glutamine synthetase (glnA) in natural populations of the marine diazotrophic cyanobacterium Trichodesmium thiebautii. FEMS Microbiology Ecologyy 21: 187-196.

Chen, Y.B., J.P. Zehr, and M. Mellon. 1996. Growth and nitrogen fixation of the diazotrophic filamentous nonheterocystous cyanobacterium Trichodesmium sp. IMS 101 in defined media: Evidence for a circadian rhythm. Journal of Phycology 32: 916-923.

Zehr, J.P., S. Braun, Y. Chen, and M. Mellon 1996. Nitrogen fixation in the marine environment: relating genetic potential to nitrogenase activity. Journal of Experimental Marine Biology and Ecology 203:61-73.

Wyman, M., J.P. Zehr, nd D.G. Capone. 1996. Temporal variability in nitrogenase gene expression in natural populations of the marine cyanobacterium Trichodesmium thiebautii. Applied and Environmental Microbiology 62:1073-1075.

Capone, D.G. and J.P. Zehr. 1996. Special section: Probing biogeochemical processes with molecular tools-Proceedings of a Microbial Ecology Division (N) Seminar at the 94th Annual Meeting of the American Society for Microbiology, May 1994-Preface. Microbial Ecology 32:229-230.

Zehr, J.P and D.G. Capone. 1996. Problems and promises of assaying the genetic potential for nitrogen fixation in the marine environment. Microbial Ecology 32: 263-281.

Zehr, J.P., M. Mellon, S. Braun, W. Litaker, T. Steppe, and H.W. Paerl. 1995. Diversity of heterotrophic nitrogen-fixation genes in a marine cyanobacterial mat. Applied and Environmental Microbiology 61:2527-2532.

Ben-Porath, J. and J.P. Zehr. 1994. Detection and characterization of cyanobacterial nifH genes. Applied and Environmental Microbiology 60:880-887.

Hare, J., R. Cowen, J.P. Zehr, F. Juanes, and K.A. Day. 1994. Biological and oceanographic insights from larval labrid (Pisces:Labridae) identification using mtDNA sequences. Marine Biology 118:17-24.

Kirshtein, J. D., J.P. Zehr, and H.W. Paerl. 1993. Determination of N2 fixation potential in the marine environment-Application of the polymerase chain reaction. Marine Ecology-Progress Series 95:305-309.

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Zehr, J.P., M. Wyman, V. Miller, L. Duguay, and D.G. Capone. 1993. Modification of the Fe protein of nitrogenase in natural populations of Trichodesmium thiebautii. Applied and Environmental Microbiology 59:669-676.

Ben-Porath, J., E.J. Carpenter, and J.P. Zehr. 1993. Genotypic relationships in Trichodesmium (Cyanophyceae), based on nifH sequence comparisons. Journal of Phycology 29:806-809.

Ohki, K., J.P. Zehr, and Y. Fujita. 1992. Regulation of nitrogenase activity in relation to the light dark regime in the filamentous non-heterocystous cyanobacterium Trichodesmium sp. NIBB-1067. Journal of General Microbiology 138:2679-2685.

Zehr, J.P., K. Ohki, and Y. Fujita. 1991. Arrangement of nitrogenase structural genes in an aerobic filamentous nonheterocystous cyanobacterium. Journal of Bacteriology 173:7055-7058.

Zehr, J.P., K. Ohki, Y. Fujita, and D. Landry. 1991. Unique modification of adenine in genomic DNA of the marine cyanobacterium Trichodesmium sp. Strain NIBB-1067. Journal of Bacteriology 173:7059-7062.

Kirshtein, J.D., H.W. Paerl, and J. Zehr. 1991. Amplification, cloning and sequencing of a nifH segment from aquatic microorganisms and natural communities. Applied and Environmental Microbiology 57:2645-2650.

Ohki, K., J.P. Zehr, P.G. Falkowski, and Y. Fujita. 1991. Regulation of the biosynthesis and activity of nitrogenase in the marine nonheterocystous cyanobacterium Trichodesmium sp. Archives of Microbiology 156:335-337.

Zehr, J.P., R.J. Limberger, K. Ohki, and Y. Fujita. 1990. Antiserum to nitrogenase generated from an amplified fragment of nifH from natural populations of Trichodesmium spp. Applied and Environmental Microbiology 56:3527-3531.

Capone, D.G., J.M. O'Neil, J.P. Zehr, and E.J. Carpenter. 1990. Basis for diel variation in nitrogenase activity in the marine planktonic cyanobacterium, Trichodesmium thiebautii. Applied and Environmental Microbiology 56:3532-3536.

Zehr, J.P. and L. A. McReynolds. 1989. The use of degenerate oligonucleotides for amplification of the nifH gene from the marine cyanobacterium Trichodesmium thiebautii. Applied and Environmental Microbiology 55:2522-2526.

Zehr, J.P., D.G. Capone, and P.G. Falkowski. 1989. Rapid incorporation of 13NO3- by NH4+-limited phytoplankton. Marine Ecology-Progress Series 51:237-241.

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Zehr, J.P. and P.G. Falkowski. 1988. Pathway of ammonium assimilation in a marine diatom determined with the radiotracer 13N. Journal of Phycology 24:588-591.

Kolber, Z., J.P. Zehr, and P.G. Falkowski. 1988. Effects of growth irradiance and nitrogen limitation on photosynthetic energy conversion in photosystem II. Plant Physiology 88:923-929.

Zehr, J.P., P.G. Falkowski, J. Fowler, and D.G. Capone. 1988. Coupling between ammonium uptake and incorporation in a marine diatom: experiments with the short-lived radiotracer N-13. Limnology and Oceanography 33:518-527.

Zehr, J.P., S.G. Paulsen, R.P. Axler, and C.R. Goldman. 1988. Dynamics of dissolved organic nitrogen in subalpine Castle Lake. Hydrobiologia 157:33-45.

Zehr, J.P., R.W. Harvey, R.S. Oremland, J.E. Cloern, L.H. George, and J.L. Lane. 1987. Big Soda Lake (Nevada). 1. Pelagic bacterial heterotrophy and biomass. Limnology and Oceanography 32:781-793.

Zehr, J.P. and R.S. Oremland. 1987. Reduction of selenate to selenide by sulfate-respiring bacteria: experiments with cell-suspensions and estuarine sediments. Applied and Environmental Microbiology 53:1365-1369.

Oremland, R.S. and J.P. Zehr. 1986. Formation of methane and carbon dioxide from dimethylselenide in anoxic sediments and by a methanogenic bacterium. Applied and Environmental Microbiology 52:1031-1036.

Zehr, J.P., R.P. Axler, and C.R. Goldman. 1985. Heterotrophic mineralization of amino acid nitrogen in subalpine Castle Lake, California. Marine Chemistry 16:343-350.

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