J P Zehr

Summary

Affiliation: University of California
Country: USA

Publications

  1. ncbi request reprint New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceans
    J P Zehr
    Ocean Sciences Dept, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
    Trends Microbiol 8:68-73. 2000
  2. ncbi request reprint Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean
    J P Zehr
    Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
    Nature 412:635-8. 2001
  3. pmc Nitrogen cycling in the ocean: new perspectives on processes and paradigms
    Jonathan P Zehr
    Department of Ocean Sciences, Earth and Marine Sciences Building, Room A438, University of California, Santa Cruz, CA 95064, USA
    Appl Environ Microbiol 68:1015-24. 2002
  4. ncbi request reprint Nitrogenase gene diversity and microbial community structure: a cross-system comparison
    Jonathan P Zehr
    Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
    Environ Microbiol 5:539-54. 2003
  5. ncbi request reprint Comparison of diazotroph community structure in Lyngbya sp. and Microcoleus chthonoplastes dominated microbial mats from Guerrero Negro, Baja, Mexico
    Enoma O Omoregie
    Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, 95064, USA
    FEMS Microbiol Ecol 47:305-8. 2004
  6. pmc Fingerprinting diazotroph communities in the Chesapeake Bay by using a DNA macroarray
    Bethany D Jenkins
    University of California, Santa Cruz, Santa Cruz, California 95064, USA
    Appl Environ Microbiol 70:1767-76. 2004
  7. doi request reprint In situ transcriptomic analysis of the globally important keystone N2-fixing taxon Crocosphaera watsonii
    Ian Hewson
    Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
    ISME J 3:618-31. 2009
  8. doi request reprint Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium
    H James Tripp
    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA
    Nature 464:90-4. 2010
  9. pmc Spatial and temporal distribution of two diazotrophic bacteria in the Chesapeake Bay
    Steven M Short
    Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, California 95064, USA
    Appl Environ Microbiol 70:2186-92. 2004
  10. pmc Determination of nitrogen-fixing phylotypes in Lyngbya sp. and Microcoleus chthonoplastes cyanobacterial mats from Guerrero Negro, Baja California, Mexico
    Enoma O Omoregie
    Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
    Appl Environ Microbiol 70:2119-28. 2004

Collaborators

Detail Information

Publications37

  1. ncbi request reprint New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceans
    J P Zehr
    Ocean Sciences Dept, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
    Trends Microbiol 8:68-73. 2000
    ..Although the extent to which these microorganisms fix nitrogen is currently unclear, ongoing research indicates that they might make a substantial contribution to the open ocean nitrogen budget...
  2. ncbi request reprint Unicellular cyanobacteria fix N2 in the subtropical North Pacific Ocean
    J P Zehr
    Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
    Nature 412:635-8. 2001
    ..Here we show that there are unicellular cyanobacteria in the open ocean that are expressing nitrogenase, and are abundant enough to potentially have a significant role in N dynamics...
  3. pmc Nitrogen cycling in the ocean: new perspectives on processes and paradigms
    Jonathan P Zehr
    Department of Ocean Sciences, Earth and Marine Sciences Building, Room A438, University of California, Santa Cruz, CA 95064, USA
    Appl Environ Microbiol 68:1015-24. 2002
  4. ncbi request reprint Nitrogenase gene diversity and microbial community structure: a cross-system comparison
    Jonathan P Zehr
    Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
    Environ Microbiol 5:539-54. 2003
    ..The broad analysis of nitrogenase genes provides a basis for developing molecular assays and bioinformatics approaches for the study of nitrogen fixation in the environment...
  5. ncbi request reprint Comparison of diazotroph community structure in Lyngbya sp. and Microcoleus chthonoplastes dominated microbial mats from Guerrero Negro, Baja, Mexico
    Enoma O Omoregie
    Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, 95064, USA
    FEMS Microbiol Ecol 47:305-8. 2004
    ....
  6. pmc Fingerprinting diazotroph communities in the Chesapeake Bay by using a DNA macroarray
    Bethany D Jenkins
    University of California, Santa Cruz, Santa Cruz, California 95064, USA
    Appl Environ Microbiol 70:1767-76. 2004
    ..M. Short, B. D. Jenkins, and J. P. Zehr, Appl. Environ. Microbiol., in press). The results show that DNA macroarrays have great potential for mapping the spatial and temporal variability of functional gene diversity in the environment...
  7. doi request reprint In situ transcriptomic analysis of the globally important keystone N2-fixing taxon Crocosphaera watsonii
    Ian Hewson
    Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
    ISME J 3:618-31. 2009
    ....
  8. doi request reprint Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium
    H James Tripp
    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA
    Nature 464:90-4. 2010
    ..The UCYN-A cyanobacterium is a paradox in evolution and adaptation to the marine environment, and is an example of the tight metabolic coupling between microorganisms in oligotrophic oceanic microbial communities...
  9. pmc Spatial and temporal distribution of two diazotrophic bacteria in the Chesapeake Bay
    Steven M Short
    Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, California 95064, USA
    Appl Environ Microbiol 70:2186-92. 2004
    ....
  10. pmc Determination of nitrogen-fixing phylotypes in Lyngbya sp. and Microcoleus chthonoplastes cyanobacterial mats from Guerrero Negro, Baja California, Mexico
    Enoma O Omoregie
    Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
    Appl Environ Microbiol 70:2119-28. 2004
    ..The results of this study indicate that several different organisms, some of which were not previously known to fix nitrogen, are likely to be responsible for the observed dark-period nitrogenase activity in these cyanobacterial mats...
  11. doi request reprint Genome-wide analysis of diel gene expression in the unicellular N(2)-fixing cyanobacterium Crocosphaera watsonii WH 8501
    Tuo Shi
    Department of Ocean Sciences, University of California, Santa Cruz, CA, USA
    ISME J 4:621-32. 2010
    ..This study represents the first whole-genome expression profiling in cultivated Crocosphaera, and the results will be useful in determining the basal physiology and ecology of the endemic Crocosphaera populations...
  12. doi request reprint Diel cycling of DNA staining and nifH gene regulation in the unicellular cyanobacterium Crocosphaera watsonii strain WH 8501 (Cyanophyta)
    Kory Pennebaker
    Ocean Sciences Department, University of California, Santa Cruz, CA 95064, USA
    Environ Microbiol 12:1001-10. 2010
    ..Thus, nifH gene expression in C. watsonii WH 8501 appears to be influenced by both circadian and environmental factors...
  13. ncbi request reprint Vertical distribution of nitrogen-fixing phylotypes in a meromictic, hypersaline lake
    G F Steward
    Department of Ocean Sciences, University of California, Santa Cruz, CA 95064, USA
    Microb Ecol 47:30-40. 2004
    ....
  14. doi request reprint Diversity and abundance of diazotrophic microorganisms in the South China Sea during intermonsoon
    Pia H Moisander
    Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA
    ISME J 2:954-67. 2008
    ..The SCS diazotroph community has a relatively low diversity and is a mixture of both estuarine and oceanic fingerprints...
  15. doi request reprint Phylogenetic diversity of cyanobacterial narB genes from various marine habitats
    Ryan W Paerl
    Department of Ocean Sciences, University of California Santa Cruz, 1156 High Street EMS D446, Santa Cruz, CA 95064, USA
    Environ Microbiol 10:3377-87. 2008
    ..Using a reverse transcription PCR method, narB mRNA sequences were amplified from Heron Island samples, indicating that narB expression can be detected in environmental samples...
  16. doi request reprint Globally distributed uncultivated oceanic N2-fixing cyanobacteria lack oxygenic photosystem II
    Jonathan P Zehr
    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
    Science 322:1110-2. 2008
    ....
  17. pmc Distribution and activity of diazotrophs in the Eastern Equatorial Atlantic
    Rachel A Foster
    Ocean Sciences, University of California, Santa Cruz, CA 95064, USA
    Environ Microbiol 11:741-50. 2009
    ..The distribution of the diazotroph groups, especially the three strains of symbiotic cyanobacteria, was different, and appeared largely controlled by riverine inputs and upwelling...
  18. doi request reprint Abundance and distribution of major groups of diazotrophic cyanobacteria and their potential contribution to N₂ fixation in the tropical Atlantic Ocean
    Nicole L Goebel
    University of California at Santa Cruz, Ocean Sciences Department, Santa Cruz, CA 95064, USA
    Environ Microbiol 12:3272-89. 2010
    ..Modelled contributions of Trichodesmium, UCYN-B and UCYN-A to total N₂ fixation suggested that Trichodesmium had the largest input, except for the potential of UCYN-A at the Cape Verde Islands...
  19. doi request reprint Microbial community gene expression within colonies of the diazotroph, Trichodesmium, from the Southwest Pacific Ocean
    Ian Hewson
    Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
    ISME J 3:1286-300. 2009
    ..The results provide insight into aggregate microbial communities in contrast to planktonic free-living assemblages that are the focus of other studies...
  20. doi request reprint Unicellular cyanobacterial distributions broaden the oceanic N2 fixation domain
    Pia H Moisander
    Department of Ocean Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
    Science 327:1512-4. 2010
    ..These findings have implications for the geographic extent and magnitude of basin-scale oceanic N2 fixation rates...
  21. ncbi request reprint Modeled contributions of three types of diazotrophs to nitrogen fixation at Station ALOHA
    Nicole L Goebel
    Institute of Marine Sciences, University of California, Santa Cruz, CA, USA
    ISME J 1:606-19. 2007
    ....
  22. ncbi request reprint Diazotrophic bacterioplankton in a coral reef lagoon: phylogeny, diel nitrogenase expression and response to phosphate enrichment
    Ian Hewson
    Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA
    ISME J 1:78-91. 2007
    ..The presence of typical open ocean phylotype transcripts in lagoon bacterioplankton may indicate that they are an important component of the N cycle of the coral reef...
  23. pmc Low genomic diversity in tropical oceanic N2-fixing cyanobacteria
    Jonathan P Zehr
    Department of Ocean Sciences, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
    Proc Natl Acad Sci U S A 104:17807-12. 2007
    ..Although genomic diversity seems to be the rule in many, if not most, marine microbial lineages, different forces may control the evolution and diversification in low abundance microorganisms, such as the nitrogen-fixing cyanobacteria...
  24. ncbi request reprint Nitrogenase genes in PCR and RT-PCR reagents: implications for studies of diversity of functional genes
    Jonathan P Zehr
    Department of Ocean Sciences and Institute of Marine Science, Earth and Marine Sciences, Bldg A438, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
    Biotechniques 35:996-1002, 1004-5. 2003
    ....
  25. ncbi request reprint Characterization of cyanobacterial glnA gene diversity and gene expression in marine environments
    Angela H Gibson
    Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
    FEMS Microbiol Ecol 55:391-402. 2006
    ..Results showed that the glnA gene can be used to characterize the diversity of natural populations of cyanobacteria, and to characterize gene expression patterns of individual species or strains...
  26. ncbi request reprint Application of a nifH oligonucleotide microarray for profiling diversity of N2-fixing microorganisms in marine microbial mats
    Pia H Moisander
    Department of Ocean Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
    Environ Microbiol 8:1721-35. 2006
    ..The nifH microarray is a powerful tool for diazotroph community analysis in the marine environment...
  27. ncbi request reprint Characterization of diatom-cyanobacteria symbioses on the basis of nifH, hetR and 16S rRNA sequences
    Rachel A Foster
    Institute of Marine Science, University of California, Santa Cruz, CA 95064, USA
    Environ Microbiol 8:1913-25. 2006
    ..clevei, H. hauckii and the Calothrix symbiont of Chaetoceros sp. respectively...
  28. ncbi request reprint Nitrogen cycle of the open ocean: from genes to ecosystems
    Jonathan P Zehr
    Ocean Sciences Department, University of California, Santa Cruz, California 95064, USA
    Ann Rev Mar Sci 3:197-225. 2011
    ..The nitrogen cycle in the oceans is an integral feature of the function of ocean ecosystems and will be a central player in how oceans respond during global environmental change...
  29. ncbi request reprint Spatial-temporal variability in diazotroph assemblages in Chesapeake Bay using an oligonucleotide nifH microarray
    Pia H Moisander
    Ocean Sciences Department, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
    Environ Microbiol 9:1823-35. 2007
    ..Higher diversity in the freshwater end of the system may reflect variability in disturbance rates and environmental conditions such as forms and concentrations of organic matter, nutrients and oxygen...
  30. ncbi request reprint Modelling the vertical distribution of Prochlorococcus and Synechococcus in the North Pacific Subtropical Ocean
    Sophie Rabouille
    Ocean Sciences Department, University of California, Santa Cruz, CA 95064, USA
    Environ Microbiol 9:2588-602. 2007
    ..Results support the idea that intermittent mixing events may have important ecological and geochemical impacts on the phytoplankton community at Station ALOHA...
  31. doi request reprint Nitrogen fixation in an anticyclonic eddy in the oligotrophic North Pacific Ocean
    Allison A Fong
    Department of Oceanography, University of Hawaii, Honolulu, HI 96822, USA
    ISME J 2:663-76. 2008
    ..These results suggest that mesoscale physical variability can play an important role in modifying the abundances of N(2) fixing microorganisms and associated rates of N(2) fixation in open ocean ecosystems...
  32. pmc Development and testing of a DNA macroarray to assess nitrogenase (nifH) gene diversity
    Grieg F Steward
    Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
    Appl Environ Microbiol 70:1455-65. 2004
    ..Our results indicate that macroarray hybridization can be a highly reproducible, semiquantitative method for assessing the diversity of functional genes represented in mixed pools of PCR products amplified from the environment...
  33. ncbi request reprint High rates of N2 fixation by unicellular diazotrophs in the oligotrophic Pacific Ocean
    Joseph P Montoya
    School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
    Nature 430:1027-32. 2004
    ....
  34. pmc Temporal patterns of nitrogenase gene (nifH) expression in the oligotrophic North Pacific Ocean
    Matthew J Church
    Department of Oceanography, University of Hawaii, Honolulu, HI 96822, USA
    Appl Environ Microbiol 71:5362-70. 2005
    ..The temporal separation of nifH expression by the various phylotypes suggests that open ocean diazotrophic cyanobacteria have unique in situ physiological responses to daily fluctuations of light in the upper ocean...
  35. ncbi request reprint Quantitative analysis of nifH genes and transcripts from aquatic environments
    Steven M Short
    Diversa Corp, San Diego, California 92121, USA
    Methods Enzymol 397:380-94. 2005
    ....
  36. ncbi request reprint Nitrogenase gene expression in the Chesapeake Bay Estuary
    Steven M Short
    Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
    Environ Microbiol 9:1591-6. 2007
    ..This study provides the first evidence of nifH expression in the Chesapeake Bay, and suggests that diazotrophic unicellular cyanobacteria have a broader distribution and activity than previously recognized...
  37. ncbi request reprint Cyanobacterial assimilatory nitrate reductase gene diversity in coastal and oligotrophic marine environments
    Bethany D Jenkins
    Department of Cell and Molecular Biology and Graduate School of Oceanography, University of Rhode Island, 45 Lower College Road, Kingston, RI 02881, USA
    Environ Microbiol 8:2083-95. 2006
    ....