OHSU

Joseph Needoba

Joseph Needoba

Email:
Phone: 503 748-1197
Fax: 503 748-1464
Website: Aquatic Biogeochemistry and Plankton Ecology Group

 

Current Appointments

Assistant Professor, Division of Environmental and Biomolecular Systems
Affiliate Scientist, Center for Coastal Margin Observation and Prediction

 

Education

B.Sc., Biology and Oceanography (Honours), University of British Columbia, Vancouver, BC, 1997
Ph.D., Botany, University of British Columbia, 2003

 

Research Interests

Marine biogeochemistry; in situ sensors and instruments; phytoplankton ecology and physiology; stable isotope ecology.

 

Selected Publications

Herfort, L.; Peterson, T. D.; Prahl, F. G.; McCue, L. A.; Needoba, J. A.; Crump, B. C.; Roegner, G. C.; Campbell, V.; Zuber, P. (2012) Red waters of Myrionecta rubra are biogeochemical hotspots for the Columbia River estuary with impacts on primary/secondary productions and nutrient cycles. Estuaries Coasts, 35, 878-891. (DOI: 10.1007/s12237-012-9485-z)

Goldman, J. H.; Rounds, S. A.; Needoba, J. A. (2012) Applications of fluorescence spectroscopy for predicting percent wastewater in an urban stream. Environ. Sci. Technol., 46, 4374-4381. (DOI: 10.1021/es2041114)

Curtis, R. G.; Needoba, J. A.; Baptista, A. M. (2011) Coastal upwelling supplies oxygen-depleted water to the Columbia River estuary. PLoS One, 6, e18672. (DOI: 10.1371/journal.pone.0018672)

Plant, J. N.; Johnson, K. S.; Needoba, J. A.; Coletti, L. J. (2009) NH4-Digiscan: An in situ and laboratory ammonium analyzer for estuarine, coastal, and shelf waters. Limnol. Oceanogr.: Methods, 7, 144-156. (DOI: 10.4319/lom.2009.7.144)

Johnson, K. S.; Needoba, J. A. (2008) Mapping the spatial variability of plankton metabolism using nitrate and oxygen sensors on an autonomous underwater vehicle. Limnol. Oceanogr., 53, 2237-2250. (DOI: 10.4319/lo.2008.53.5_part_2.2237)

Jannasch, H. W.; Coletti, L. J.; Johnson, K. S.; Fitzwater, S. E.; Needoba, J. A.; Plant, J. N. (2008) The land/ocean biogeochemical observatory: A robust networked mooring system for continuously monitoring complex biogeochemical cycles in estuaries. Limnol. Oceanogr.: Methods, 6, 263-276. (DOI: 10.4319/lom.2008.6.263)

Needoba, J. A.; Foster, R. A.; Sakamoto, C.; Zehr, J. P.; Johnson, K. S. (2007) Nitrogen fixation by unicellular diazotrophic cyanobacteria in the temperate oligotrophic North Pacific Ocean. Limnol. Oceanogr., 52, 1317-1327. (DOI: 10.4319/lo.2007.52.4.1317)

Johnson, K. S.; Needoba, J. A.; Riser, S. C.; Showers, W. J. (2007) Chemical sensor networks for the aquatic environment. Chem. Rev. (Washington, DC, U. S.), 107, 623-640. (DOI: 10.1021/cr050354e)

Needoba, J. A.; Sigman, D. M.; Harrison, P. J. (2004) The mechanism of isotope fractionation during algal nitrate assimilation as illuminated by the 15N/14N of intracellular nitrate. J. Phycol., 40, 517-522. (DOI: 10.1111/j.1529-8817.2004.03172.x)

Needoba, J. A.; Harrison, P. J. (2004) Influence of low light and a light:dark cycle on NO-3 uptake, intracellular NO-3, and nitrogen isotope fractionation by marine phytoplankton. J. Phycol., 40, 505-516. (DOI: 10.1111/j.1529-8817.2004.03171.x)

Granger, J.; Sigman, D. M.; Needoba, J. A.; Harrison, P. J. (2004) Coupled nitrogen and oxygen isotope fractionation of nitrate during assimilation by cultures of marine phytoplankton. Limnol. Oceanogr., 49, 1763-1773. (DOI: 10.4319/lo.2004.49.5.1763)

Boyd, P. W.; Law, C. S.; Wong, C. S.; Nojiri, Y.; Tsuda, A.; Levasseur, M.; Takeda, S.; Rivkin, R.; Harrison, P. J.; Strzepek, R.; Gower, J.; McKay, R. M.; Abraham, E.; Arychuk, M.; Barwell-Clarke, J.; Crawford, W.; Crawford, D.; Hale, M.; Harada, K.; Johnson, K.; Kiyosawa, H.; Kudo, I.; Marchetti, A.; Miller, W.; Needoba, J.; Nishioka, J.; Ogawa, H.; Page, J.; Robert, M.; Saito, H.; Sastri, A.; Sherry, N.; Soutar, T.; Sutherland, N.; Taira, Y.; Whitney, F.; Wong, S.-K. E.; Yoshimura, T. (2004) The decline and fate of an iron-induced subarctic phytoplankton bloom. Nature (London, U. K.), 428, 549-553. (DOI: 10.1038/nature02437)