Books, Monographs


Chapters published

Zehr, J. P. and H. W. Paerl. 2008. Molecular ecological aspects of nitrogen fixation in the marine environment, p. 481-525. In D. L. Kirchman (ed.), Microbial ecology of the oceans. 2nd Edition. Wiley-Liss, Inc, Durham, NC.

Karl, D. M., R. R. Bidigare, M. J. Church, J. E. Dore, R. M. Letelier, C. Mahaffey and J. P. Zehr. 2008. The nitrogen cycle in the North Pacific trades biome: An evolving paradigm, p. 705-769. In, D. G. Capone, D. A. Bronk, M. R. Mulholland and E. J. Carpenter (ed.), Nitrogen in the Marine Environment, Academic Press, New York, NY.

Jenkins, B. D. and J. P. Zehr. 2008. Molecular approaches to the nitrogen cycle, p. 1303-1329. In, D. G. Capone, D. A. Bronk, M. R. Mulholland and E. J. Carpenter (ed.), Nitrogen in the Marine Environment, Academic Press, New York, NY.

Stal, L. J. and  J. P. Zehr. 2008. Cyanobacterial nitrogen fixation in the ocean: diversity, regulation and ecology,  p. 423-446. In, A. Herrero, E. Flores (ed.), The cyanobacteria: molecular biology, genomics and evolution. Caister Academic Press, Norfolk, UK.

Zehr, J. P. and J. P. Montoya. 2007. Measuring N2 fixation in the field, p. 193-205. In, H. Bothe, S. Ferguson, and W. E. Newton (ed.), Biology of the nitrogen cycle. Elsevier B.V., Amsterdam, The Netherlands.

Zehr, J. P., M. J. Church, and P. H. Moisander. 2006. Diversity, distribution and biogeochemical significance of nitrogen-fixing microorganisms in anoxic and suboxic ocean environments, p. 337-369. In,  L. Neretin (ed.), Past and present water column anoxia. NATO Science Series. Springer, Dordrecht, The Netherlands.

Zehr, J. P., B. A. Methé,  and R. Foster. 2005. New nitrogen-fixing microorganisms from the oceans: biological aspects and global implications,  p. 361-365. In Y. P. Wang, M. Lin, Z. X. Tian, C. Elmerich, W. E. Newton (ed.), Biological nitrogen fixation, sustainable agriculture and the environment. Proceedings of the 14th International Nitrogen Fixation Congress. Current plant science and biotechnology in agriculture. Springer, Dordrecht, The Netherlands.

Short, S. M. and J. P. Zehr. 2005. Quantitative analysis of nifH genes and transcripts from aquatic environments,  p. 380-394.  In J. Leadbetter (ed.),  Methods in enzymology: environmental microbiology. Elsevier B.V., Amsterdam, The Netherlands.

Zehr, J. P. and D. G. Capone. 2002. Nitrogen fixation in the marine environment,  p. 2211-2221. In G. Bitton (ed.), Encyclopedia of environmental microbiology. John Wiley & Sons, London, UK.

Zehr, J. P. and P. J. Turner. 2001. Nitrogen fixation: nitrogenase genes and gene expression, p. 271-286. In J. H. Paul (ed.),  Methods In marine microbiology. Academic Press, New York, NY.

Ehrlich, H. L., R. S. Oremland,  and J. P. Zehr. 2001. Biogeochemical cycles, p. 1-10.  In Encyclopedia of life sciences. John Wiley & Sons, Ltd., London, UK.

Zehr, J. P. and D. G. Capone. 2000. Oceanic nitrogen fixation: Ecology and molecular biology of Trichodesmium, a marine diazotroph, p. 15-31. In E. W. Triplett (ed.), Prokaryotic nitrogen fixation: a model system for the analysis of a biological process. Horizon Scientific Press, Wymondham, UK.

Paerl, H. W. and J. P. Zehr. 2000. Marine nitrogen fixation, p. 387-426. In D. L. Kirchman (ed.),  Microbial ecology of the oceans. Wiley-Liss, Inc., New York, NY.

Zehr, J. P. and M. Voytek. 1999. Molecular ecology of aquatic communities: reflections and future directions,  p. 288. In J.P Zehr and M. Voytek (ed.),  Hydrobiologia/Developments in Hydrobiologia, Volume 138. Kluwer Publishers, Amsterdam, The Netherlands.

Zehr, J. P., B. Dominic, Y. B. Chen, M. Mellon,  and J. C. Meeks. 1999. Nitrogen fixation in the marine cyanobacterium Trichodesmium: a challenging model for ecology and molecular biology, p. 485-500. In G. A. Peschek, W. Löffelhardt, and G. Schmetterer (ed.), The phototrophic prokaryotes. Kluwer Academic/Plenum Publishers, New York, NY.

Zehr, J. P. and W. Hiorns. 1998. Molecular approaches to studies of the activities of marine organisms, p. 91-112. In K. E. Cooksey (ed.), Molecular approaches to the study of the ocean, Chapman and Hall, London, UK.

Zehr, J. P. and H. W. Paerl. 1998. Nitrogen fixation in the marine environment: genetic potential and nitrogenase expression., p. 285-301. In K. E. Cooksey (ed.), Molecular approaches to the study of the ocean, Chapman and Hall, London, UK.

Zehr, J. P. 1995. Nitrogen fixation in the sea: Why only Trichodesmium? , p. 335-364. In I. Joint (ed.), Molecular ecology of aquatic microbes,  NATO ASI Series, Vol. G. 38, Springer Verlag, Berlin.

Ohki, K., J. P. Zehr, and Y. Fujita. 1992. Trichodesmium: Establishment of culture and characteristics of N2-fixation, p. 307-318. In  Marine pelagic cyanobacteria: Trichodesmium and other diazotrophs, E. J. Carpenter, D. G. Capone, and J. G. Rueter (ed.), Kluwer Academic Publishers, Dordrecht, The Netherlands.

Zehr, J. P. 1992. Molecular biology of nitrogen fixation in natural populations of marine cyanobacteria, p. 249-264. In E. J. Carpenter, D. G. Capone, and J. G. Rueter (ed.), Marine pelagic cyanobacteria: Trichodesmium and other diazotrophs, Kluwer Academic Publishers, Dordrecht, The Netherlands.

Journal Articles

Manuscripts in press



Manuscripts published

Zehr, J. P. and R. M. Kudela. 2009. Photosynthesis in the open ocean. Science. 326:945-946.  Abstract Full Text

Hewson, I., R. W. Paerl, H. J. Tripp, J. P. Zehr, and D. M. Karl. 2009. Metagenomic potential of microbial assemblages in the surface waters of the central Pacific Ocean tracks variability in oceanic habitat. Limnol. Oceanogr. 54:1981-1994.

Zehr, J. P. 2009. New twist on nitrogen cycling in oceanic oxygen minimum zones. Proc. Natl. Acad. Sci. USA. 106(12):4575-4576.

Zehr, J. P. 2009. From microbes to global environmental change: thinking big about small things.  Environ. Microbiol. Reports. 1:24-26.

Church, M. J., C. Mahaffey, R. M. Letelier,  R. Lukas, J. P. Zehr, and D. M. Karl. 2009. Physical forcing  of nitrogen fixation and diazotroph community structure in the North Pacific subtropical gyre. Global Biogeochem. Cy. 23:GB2020. doi:10.1029/2008GB003418.

Hewson, I., R. Poretsky, S. T., Dyhrman, B. Zielinski, A. E. White, H. J. Tripp, J. P. Montoya, and J. P. Zehr. 2009. Microbial community gene expression within colonies of the diazotroph, Trichodesmium,from the Southwest Pacific Ocean. ISME J. 3:1286-1300.

Hewson, I., R. Poretsky, R. Beinart,  A. White, T. Shi, S. R. Bench, P. H. Moisander, R. W. Paerl, H. J. Tripp, J. P.  Montoya, M. A. Moran, and J. P. Zehr. 2009. In situ transcriptomic analysis of the globally important keystone N2-fixing taxon Crocosphaera watsonii. ISME J. 3:618-631.

Poretsky, R., I. Hewson, S. Sun, A. E. Allen, J. P. Zehr, and M. A. Moran. 2009. Comparative day/night metatranscriptomic analysis of microbial communities in the North Pacific subtropical gyre. Environ. Microbiol. 11(6):1358-1375.

Ilikchyan, I. N., R. M. McKay, J. P. Zehr, S. T. Dyhrman, and G. S. Bullerjahn. 2009. Detection and expression of the phosphonate transporter gene phnD in marine and freshwater picocyanobacteria. Environ. Microbiol.  11(5):1314-1324.

Foster, R. A., A. Paytan,  and J. P. Zehr. 2009. Seasonality of N2 fixation and nifH gene diversity in the Gulf of Aqaba (Red Sea). Limnol. Oceanogr. 54(1):219-233.

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. Limnol.  Oceanogr. 53(6):2519-2532.

Zehr, J. P., I. Hewson, and P. H. Moisander. 2008. Molecular biology techniques and applications for ocean sensing. Ocean Sci. Discuss. 5:625-657.

Zehr, J. P., S. R. Bench, B. J. Carter, I. Hewson,  F. Niazi, T. Shi, , H. J. Tripp, and J. P. Affourtit.  2008. Globally distributed uncultivated oceanic N2-fixing cyanobacteria lack oxygenic photosystem II. Science. 322:1110-1112. Abstract Full Text

Foster, R. A., A. Subramaniam, and J. P. Zehr. 2008. Distribution and activity of diazotrophs in the Eastern Equatorial Atlantic. Environ. Microbiol. 11(4):741-750.

Paerl,  R. W., R. A. Foster, B. D. Jenkins, J. P. Montoya, and J. P. Zehr.  2008. Phylogenetic diversity of cyanobacterial narB genes from various marine habitats. Environ. Microbiol. 10(12): 3377-3387.

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. J. Phycol. 44(5):1212-1220.

Moisander, P. H., Beinart, R. A., Voss, M. and J. P. Zehr.  2008. Diversity and abundance of diazotrophic microorganisms in the South China Sea during intermonsoon. ISME J.  2(6): 254-267.

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. ISME J. 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. Limnol. Oceanogr. 53(1):63-77.

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

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. ISME J. 1:606-619.

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. PNAS 104(45):17808-17812.

Hewson, I., P. H. Moisander,  A. E. Morrison,  and J. P. Zehr. 2007. Diazotrophic bacterioplankton in a coral reef lagoon: Phylogeny, diel nitrogenase expression, and response to phosphate enrichment. ISME J. 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. Environ. Microbiol. 9(7):1823-1835.

Needoba, J. A., R. A. Foster, C. Sakamoto, J. P. Zehr, and K. S. Johnson. 2007. Nitrogen fixation by unicellular diazotrophic cyanobacteria in the temperate oligotrophic North Pacific Ocean. Limnol. Oceanogr. 52(4): 1317-1327.

Rabouille, S., C. A. Edwards, and J. P. Zehr. 2007. Modelling the vertical distribution of Prochlorococcus and Synechococcus in the North Pacific Subtropical Ocean. Environ. Microbiol. 9(10): 2588-2602.

Foster, R. A., A. Subramaniam, C. Mahaffey, E. J. Carpenter, D. G. Capone, 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. Limnol. Oceanogr. 52(2): 517-532.

Short, S. M. and J. P. Zehr. 2007. Nitrogenase gene expression in the Chesapeake Bay Estuary. Environ. Microbiol. 9(6):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. Aquat. Microb. Ecol. 46:15-30.

Ward, B. B., D. G. Capone, and J. P. Zehr. 2007. What’s new in the nitrogen cycle? Oceanography. 20(2):101-109.

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

Jenkins, B. D., J. P. Zehr, A. Gibson, and  L. Campbell. 2006. Cyanobacterial assimilatory nitrate reductase gene diversity in coastal and oligotrophic marine environments. Environ. Microbiol. 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. Environ. Microbiol. 8(11):1913-1925.

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. Environ. Microbiol. 8(10):1721-1735.

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

Gibson, A. H., B. D. Jenkins, F. P. Wilkerson, S. M.  Short, and J. P. Zehr. 2006. Characterization of cyanobacterial glnA gene diversity and gene expression in marine environments. FEMS Microbiol. Ecol. 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. Appl. Environ. Microbiol. 71(9):5362-5370.

Church, M. J., B. D. Jenkins,  D. M. Karl, and J. P. Zehr. 2005. Vertical distributions of nitrogen-fixing phylotypes at Stn ALOHA in the oligotrophic North Pacific Ocean. Aquat Microb. Ecol.  38:3-14.

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. 430:1027-1031.

Short, S. M., B. D. Jenkins, and J. P. Zehr.  2004. Spatial and temporal distribution of two diazotrophic bacteria in the Chesapeake Bay. Appl. Environ. Microbiol. 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. Appl. Environ. Microbiol. 70(3):1767-1776.

Steward, G. F., B. D. Jenkins, B. B. Ward, and J. P. Zehr. 2004. Development and testing of a DNA macroarray to assess nitrogenase (nifH) gene diversity. Appl. Environ. Microbiol. 70:(3)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, Baja California Mexico. Appl. Environ. Microbiol. 70(4): 2119-2128.

Omoregie, E. O., L. L. Crumbliss, B. M. Bebout, and J. P. Zehr.  2004. Comparison of diazotroph community structure in Lyngbya sp. and Microcoleus chthonoplastes dominated microbial mats from Guerrero Negro, Baja, Mexico. FEMS Microbiol. Ecol. 47:305-318.

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. Ecol. 47:30-40.

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. Bio.Techniques 35(5):996-1005.

Karouna-Renier, N. K. 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. Environ. Microbiol. 5:539-554.

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

Zehr, J. P. and B. B. Ward. 2002. Nitrogen cycling in the ocean: New perspectives on processes and paradigms. Appl. Environ. Microbiol. 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. Appl. Environ. Microbiol. 67(11):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., Van Mooy, B., Baker, B. J., Mellon, M., Moisander, P. H., Paerl, H. W., Zehr, J. P., Hollander, D. and D. A. Stahl. 2001. Microbiological, molecular biological, and stable isotopic evidence for nitrogen fixation in the open waters of Lake Michigan. Environ. Microbiol. 3(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. Ecol. 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. Appl. and Environ. Microbiol. 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. J. Phycol. 36: 693-701.

Zehr, J. P., E. J. Carpenter, and T. A. Villareal. 2000. New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceans. Trends in Microbiol. 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 Mol. Biol. 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 Soil Poll. 111:19-28.

Sullivan, T. J., D. F. Charles, J. A Bernert, B. McMartin, K. B. Vaché,  and J. P. Zehr. 1999. Relationship between landscape characteristics, history, and lakewater acidification in the Adirondack Mountains, New York. Water Air Soil Poll.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 Microbiol. Ecol. 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. J. Environ. Eng.-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.

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. Syst. Appl. Microbiol. 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. Appl. Environ. Microbiol. 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. J. Bacteriol. 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. Limnol. Oceanogr. 43:368-374.

Momen, B. and J. P. Zehr. 1998. Watershed classification by discriminant analyses of lakewater-chemistry and terrestrial characteristics. Ecol. Appl. 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. Mar. Biol. 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 Microbiol. Lett. 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. Appl. Environ. Microbiol. 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. Microbiol.-UK 143:1443-1450.

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, USA? Environ. Manage. 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. Ecol. Model. 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 Microbiol.Ecol. 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. J. Phycol. 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. J. Exp. Mar. Biol. Ecol. 203:61-73.

Wyman, M., J. P. Zehr,  and D. G. Capone. 1996. Temporal variability in nitrogenase gene expression in natural populations of the marine cyanobacterium Trichodesmium thiebautii. Appl. Environ. Microbiol. 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. Microb. Ecol. 32(3):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. Microb. Ecol. 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. Appl. Environ. Microbiol.  61:2527-2532.

Ben-Porath, J. and J. P. Zehr. 1994. Detection and characterization of cyanobacterial nifH genes. Appl. Environ. Microbiol. 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. Mar. Biol. 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. Mar. Ecol.-Prog. Ser. 95:305-309.

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. Appl. Environ. Microbiol. 59:669-676.

Ben-Porath, J., E. J. Carpenter, and J. P. Zehr. 1993. Genotypic relationships in Trichodesmium (Cyanophyceae), based on nifH sequence comparisons. J. Phycol. 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. J. Gen. Microbiol. 138:2679-2685.

Zehr, J. P., K. Ohki, and Y. Fujita. 1991. Arrangement of nitrogenase structural genes in an aerobic filamentous nonheterocystous cyanobacterium. J. Bacteriol. 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. J. Bacteriol. 173:7059-7062.

Kirshtein, J. D., H. W. Paerl,  and J. P. Zehr. 1991. Amplification, cloning and sequencing of a nifH segment from aquatic microorganisms and natural communities. Appl. Environ. Microbiol. 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. Arch. Microbiol. 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. Appl. Environ. Microbiol. 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. Appl. Environ. Microbiol. 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. Appl. Environ. Microbiol. 55:2522-2526.

Zehr, J. P., D. G. Capone, and P. G. Falkowski. 1989. Rapid incorporation of 13NO3- by NH4+-limited phytoplankton. Mar. Ecol.-Progr. Ser. 51:237-241.

Zehr, J. P. and P. G. Falkowski. 1988. Pathway of ammonium assimilation in a marine diatom determined with the radiotracer 13N. J. Phycol. 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 Physiol. 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. Limnol. Oceanogr. 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. Cloern, L. H. George,  and J. L. Lane. 1987. Big Soda Lake (Nevada). 1. Pelagic bacterial heterotrophy and biomass. Limnol. Oceanogr. 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. Appl. Environ. Microbiol. 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. Appl. Environ. Microbiol. 52:1031-1036.