Campus Directory

Pronouns she, her, her, hers, herself

Division Physical & Biological Sciences Division

Department/College/Unit Ocean Sciences Department

Title Assistant Professor

Affiliation Faculty

Faculty Type Regular Faculty

Areas of Expertise Ocean Studies
Oceanography

Primary Office Location Earth & Marine Sciences
A438

Additional Location(s) E&MS D446

Mail Stop Ocean Sciences

Selected Publications

See google scholar for a complete list of publications. 

2023

Turk-Kubo, K.A., Henke, B.A., Gradoville, M.R., Magasin, J., Church, M., Zehr, J.P. 2023. Seasonal and Spatial Patterns in Diazotroph Community Composition at Station ALOHA, Frontiers in Microbiology, 10. https://doi.org/10.3389/fmars.2023.1130158

Salas, K., Cabello, A.M., Turk-Kubo, K.A., Zehr, J.P., Cornejo-Castillo, F.M. 2023. Ammonium transporter gene variants reveal new diversity of the haptophyte algal hosts of the marine nitrogen-fixing cyanobacteria UCYN-A, Frontiers in Microbiology: Rising Stars in Microbial Symbiosis, 14. https://doi.org/10.3389/fmicb.2023.1130695

Dugenne, M., Gradoville, M.R., Church, M.J., Barone, B., Wilson, S.T., Sheyn, U., Harke, M.J., Björkman, K.M., Hawco, N.J., Hynes, A.M, Ribalet, F., White, A.E., Karl, D.M., Delong, E.F., Dyhrman, S., John, S., Armbrust, E.V., Eppley, J.M., Harding, K., Stewart, B., Cabello, A.M., Turk-Kubo, K.A., Caffin, M., Zehr, J.P. 2023. Nitrogen fixation in mesoscale eddies of the North Pacific: patterns and mechanisms, Global Biogeochemical Cycles, 37(4), e2022GB007386. https://doi.org/10.1029/2022GB007386

2022

Turk-Kubo, K.A., Gradoville, M.R., Cheung, S., Cornejo-Castillo, F.M., Harding, K.J. Morando, M., Mills, M.M., Zehr, J.P. 2022. Non-cyanobacterial diazotrophs: Global diversity, distribution, ecophysiology, and activity in marine waters, FEMS Microbiology Reviews. (invited review)https://doi.org/10.1093/femsre/fuac046

Harding, K.J., Turk-Kubo, K.A., Mak, W.E., Weber, P.K., Mayali, X., Zehr, J.P., 2022. Direct cell-specific measurements show N2 fixation by particle-attached non-cyanobacterial diazotrophs in the North Pacific Subtropical Gyre, Nature Communications, 13, 6979. https://doi.org/10.1038/s41467-022-34585-y

Cheung, S., Liu, K., Turk‐Kubo, K.A., Nishioka, J., Suzuki, K., Landry, M.R., Zehr, J.P., Leung, S., Deng, L. and Liu, H., 2022. High biomass turnover rates of endosymbiotic nitrogen‐fixing cyanobacteria in the western Bering Sea. Limnology and Oceanography Letters.https://doi.org/10.17882/88209

White, A.E., Granger, J. and Turk-Kubo, K., 2022. Questioning High Nitrogen Fixation Rate Measurements in the Southern Ocean. Nature Geoscience, 15(1), pp.29-30. https://doi.org/10.1038/s41561-021-00873-3

Schvarcz, C.R., Wilson, S.T., Caffin, M., Stancheva, R., Li, Q., Turk-Kubo, K.A., White, A.E., Karl, D.M., Zehr, J.P. and Steward, G.F., 2022. Overlooked and widespread pennate diatom-diazotroph symbioses in the sea. Nature Communications, 13(1), pp.1-9. https://doi.org/10.1038/s41467-022-28065-6

2021

Turk-Kubo, K.A., Mills, M.M., Arrigo, K.R., van Dijken, G., Henke, B.A., Stewart, B.^, Wilson, S.T. and Zehr, J.P., 2021. UCYN-A/haptophyte symbioses dominate N2 fixation in the Southern California Current System. ISME Communications, 1(1), pp.1-13. https://doi.org/10.1038/s43705-021-00039-7 ^undergraduate researcher mentee

Gradoville, M.R., Cabello, A.M., Wilson, S.T., Turk‐Kubo, K.A., Karl, D.M. and Zehr, J.P., 2021. Light and depth dependency of nitrogen fixation by the non‐photosynthetic, symbiotic cyanobacterium UCYN‐A. Environmental Microbiology, 23(8), pp.4518-4531. https://doi.org/10.1111/1462-2920.15645

Landa, M., Turk-Kubo, K.A., Cornejo-Castillo, F.M., Henke, B.A. and Zehr, J.P., 2021. Critical Role of Light in the Growth and Activity of the Marine N2-Fixing UCYN-A Symbiosis. Frontiers in Microbiology, 12, p.666739. https://doi.org/10.3389/fmicb.2021.666739

2020

Farnelid, H., Turk-Kubo, K., and Zehr, J.P., 2020. Cell sorting reveals few novel prokaryote and photosynthetic picoeukaryote associations in the oligotrophic ocean. Environmental Microbiology, 23(3), 1469-1480. https://doi.org/10.1111/1462-2920.15351

Saulia, E., Benavides, M., Henke, B., Turk-Kubo, K., Cooperguard, H.^, Grosso, O., Desnues, A., Rodier, M., Dupouy, C., Riemann, L. and Bonnet, S., 2020. Seasonal Shifts in Diazotrophs Players: Patterns Observed Over a Two-Year Time Series in the New Caledonian Lagoon (Western Tropical South Pacific Ocean). Frontiers in Marine Science, 7. https://doi.org/10.3389/fmars.2020.581755 ^undergraduate researcher mentee

Cabello, A.M., Turk‐Kubo, K.A., Hayashi, K., Jacobs, L.^, Kudela, R.M. and Zehr, J.P., 2020. Unexpected presence of the nitrogen‐fixing symbiotic cyanobacterium UCYN‐A in Monterey Bay, California. Journal of Phycology, 56(7), pp. 1521-1533. https://doi.org/10.1111/jpy.13045^undergraduate researcher mentee

Mills, M.M.†, Turk-Kubo, K.A.†, van Dijken, G.L., Henke, B.A., Harding, K., Wilson, S.T., Arrigo, K.R. and Zehr, J.P., 2020. Unusual marine cyanobacteria/haptophyte symbiosis relies on N2 fixation even in N-rich environments. ISME Journal, 14, pp. 2395–2406. †equal contribution https://doi.org/10.1038/s41396-020-0691-6

Shilova, I.N., Magasin, J.D., Mills, M.M., Robidart, J.C., Turk-Kubo, K.A. and Zehr, J.P., 2020. Phytoplankton transcriptomic and physiological responses to fixed nitrogen in the California current system. PLOS One, 15(4), p.e0231771. https://doi.org/10.1371/journal.pone.0231771

Gradoville, M.R., Farnelid, H., White, A.E., Turk‐Kubo, K.A., Stewart, B., Ribalet, F., Ferrón, S., Pinedo‐Gonzalez, P., Armbrust, E.V., Karl, D.M. and John, S., 2020. Latitudinal constraints on the abundance and activity of the cyanobacterium UCYN‐A and other marine diazotrophs in the North Pacific. Limnology and Oceanography, 65(8), pp. 1858-1875. https://doi.org/10.1371/journal.pone.0231771

2019

Wilson, S.T., Hawco, S.T., Armbrust, E.V., Barone, B., Björkman, K.M., Boysen, A.K., Burgos, M., Burrell, T.J., Casey, J.R., DeLong, E.F., Dugenne, M., Dutkiewicz, S., Dyhrman, S.T., Ferrón, S., Follows, M.J., Foreman, R.K., Funkey, C.P., Harke, M.J., Henke, B.A., Hill, C.N., Hynes, A.M., Ingalls, A.E., Jahn, O., Kelly, R.L., Knapp, A.N., Letelier, R.M., Ribalet, F., Shimabukuro, E.M., Tabata, R.K.S., Turk-Kubo, K.A., White, A.E., Zehr, J.P., John, S., and Karl, D.M., 2019. Kīlauea lava fuels phytoplankton bloom in the North Pacific Ocean. Science, 365(6457), pp.1040-1044. DOI: 10.1126/science.aax4767

Moreira-Coello, V., Mouriño-Carballido, B., Marañón, E., Bode, A., Sintes, E., Zehr, J.P., Turk-Kubo, K.A. and Varela, M.M., 2019. Temporal variability of diazotroph community in the upwelling region off NW Iberia. Scientific Reports, 9(1), p.3737. https://doi.org/10.1038/s41598-019-39586-4

Cornejo-Castillo, F.M., Muñoz-Marin, M., Turk-Kubo, K.A., Royo-Llonch, M., Farnelid, H., Acinas, S.G., and Zehr, J.P., 2019. UCYN-A3, a newly discovered open ocean sublineage of the symbiotic N2-fixing cyanobacterium Candidatus Atelocyanobacterium thalassa. Environmental Microbiology, 21(1), 111-124. https://doi.org/10.1111/1462-2920.14429

2018

Harding, K., Turk-Kubo, K. A., Sipler, R,E., Mills, M,M., Bronk, D,A., and Zehr, J,P., 2018. Symbiotic unicellular cyanobacteria fix nitrogen in the Arctic Ocean. Proceedings of the National Academy of Sciences, 115(52), 13371-13375. https://doi.org/10.1073/pnas.1813658115

Farnelid, H., Turk-Kubo, K.A., Ploug, H., Ossolinski, J.E., Collins, J.R., Van Mooy, B.A.S, and Zehr, J.P., 2018. Diverse diazotrophs are present on sinking particles in the North Pacific Subtropical Gyre. ISME Journal, 13(1), pp.170-182. https://doi.org/10.1038/s41396-018-0259-x

Turk-Kubo, K.A., Connell, P.E., Caron, D.A., Hogan, M.E., Farnelid, H.M., and Zehr, J.P., 2018. In situ diazotroph population dynamics under different resource ratios in the North Pacific Subtropical Gyre. Frontiers in Microbiology, 9, article no. 1616. https://doi.org/10.3389/fmicb.2018.01616

Henke, B.A., Turk-Kubo, K.A., Bonnet, S., and Zehr, J.P., 2018. Distributions and Abundances of Sublineages of the N2-Fixing Cyanobacterium Candidatus Atelocyanobacterium thalassa (UCYN-A) in the New Caledonian Coral Lagoon. Frontiers in Microbiology, 9, article no. 554. https://doi.org/10.3389/fmicb.2018.00554

2017

Zehr, J.P., Shilova, I.N., Farnelid, H.M., Del Carmen Munoz-Marin, M., and Turk-Kubo, K.A., 2017. Unusual marine unicellular symbiosis with the nitrogen-fixing cyanobacterium UCYN-A. Nature Microbiology, 2(1), pp. 1-11. https://doi.org/10.1038/nmicrobiol.2016.214

Wilson, S.T., Aylward, F.O., Ribalet, F., Barone, B., Casey, J.R., Connell, P.E., Eppley, J.M., Ferron, S., Fitzsimmons, J.N., Hayes, C.T., Romano, A.N., Turk-Kubo, K.A., Vislova, A., Armbrust, E.V., Caron, D.A., Church, M.J., Zehr, J.P., and DeLong, E.F., 2017. Coordinated regulation of growth, activity and transcription in natural populations of the unicellular nitrogen-fixing cyanobacterium Crocosphaera. Nature Microbiology, 2(9), article no. 17118. https://doi.org/10.1038/nmicrobiol.2017.118

Turk‐Kubo, K.A., Farnelid, H.M., Shilova, I.N., Henke, B., and Zehr, J.P., 2017. Distinct ecological niches of marine symbiotic N2‐fixing cyanobacterium Candidatus Atelocyanobacterium thalassa sublineages. Journal of Phycology, 53, pp. 451-461. https://doi.org/10.1111/jpy.12505

Shilova, I., Mills, M., Robidart, J., Turk‐Kubo, K., Björkman, K., Kolber, Z., Rapp, I., Van Dijken, G., Church, M., and Arrigo, K., 2017. Differential effects of nitrate, ammonium, and urea as N sources for microbial communities in the North Pacific Ocean. Limnology and Oceanography, 62, pp. 2550-2574. https://doi.org/10.1002/lno.10590

Rees, A.P., Turk-Kubo, K.A., Al-Moosawi, L., Alliouane, S., Gazeau, F., Hogan, M.E., and Zehr, J.P., 2017. Ocean acidification impacts on nitrogen fixation in the coastal western Mediterranean Sea. Estuarine, Coastal and Shelf Science, 186, pp. 45-57. https://doi.org/10.1016/j.ecss.2016.01.020

2016

Frank, I.E., Turk‐Kubo, K.A., and Zehr, J.P., 2016. Rapid annotation of nifH gene sequences using classification and regression trees facilitates environmental functional gene analysis. Environmental Microbiology Reports, 8, pp. 905-916. https://doi.org/10.1111/1758-2229.12455

Fernández-Méndez, M., Turk-Kubo, K.A., Buttigieg, P.L., Rapp, J.Z., Krumpen, T., Zehr, J.P., and Boetius, A., 2016. Diazotroph diversity in the sea ice, melt ponds, and surface waters of the Eurasian basin of the Central Arctic Ocean. Frontiers in Microbiology, 7, article no. 1884. https://doi.org/10.3389/fmicb.2016.01884

Farnelid, H.M., Turk-Kubo, K.A., and Zehr, J.P., 2016. Identification of associations between bacterioplankton and photosynthetic picoeukaryotes in coastal waters. Frontiers in Microbiology, 7, article no. 339. https://doi.org/10.3389/fmicb.2016.00339

Farnelid, H., Turk-Kubo, K., Del Carmen Muñoz-Marín, M., and Zehr, J.P., 2016. New insights into the ecology of the globally significant uncultured nitrogen-fixing symbiont UCYN-A. Aquatic Microbial Ecology, 77, pp. 125-138. DOI: https://doi.org/10.3354/ame01794

Bonnet, S., Berthelot, H., Turk‐Kubo, K., Cornet‐Barthaux, V., Fawcett, S., Berman‐Frank, I., Barani, A., Grégori, G., Dekaezemacker, J., and Benavides, M., 2016. Diazotroph derived nitrogen supports diatom growth in the South West Pacific: a quantitative study using nanoSIMS. Limnology and Oceanography, 61, pp. 1549-1562. https://doi.org/10.1002/lno.10300