OSVALDO ULLOAPicture Osvaldo Ulloa

        Profesor Titular
        Departamento de Oceanografía
        & Centro de Investigación Oceanográfica en el Pacífico Sudoriental (COPAS)
        PROFC - Cabina 7 - Barrio Universitario
        Casilla 160-C
        Concepción 3
: +56 41 220-3585
+56 41 223-9900


Oceanografía microbiana, bio-óptica marina, ciclos biogeoquímicos y clima.


- Ph.D. Dalhousie University (Oceanografía), 1993.
- M.Sc. Dalhousie University (Biología Marina), 1987.
- Biólogo Marino. Universidad de Concepción, 1983.
- Licenciatura. Universidad de Concepción (Biología Marina), 1982.


2006 -                   Profesor Titular, Departamento de Oceanografía, Universidad de Concepción, Chile.
2002 - 2002         Subdirector, Centro de Investigación Oceanográfica en el Pacífico Sudoriental (COPAS), Chile.
2000 - 2006
        Profesor Asociado, Departamento de Oceanografía, Universidad de Concepción, Chile.
1997 - 2007         Director del Programa Regional de Oceanografía Física y Clima (PROFC), Universidad de Concepción, Chile.
1996 - 2000         Profesor Visitante, Universidad de Concepción, Chile.
1996 - 1997         Profesor-Investigador Asociado, Department of Geophyiscs, Niels Bohr Institute, University of Copenhagen, Dinamarca.
1995 - 1996         Profesor-Investigador Asistente, Department of Geophyiscs, Niels Bohr Institute, University of Copenhagen, Dinamarca.
1994 - 1995         Postdoctorante, Department of Geophysics, Niels Bohr Institute, University of Copenhagen, Dinamarca.
1993 - 1994         Postdoctorante, Biological Oceanography Division, Bedford Institute of Oceanography, Canadá.


2009 -                  Miembro  del Consejo de Ciencias del Fondo Nacional de Investigación Científica y Tecnológica (Fondecyt).
2006 - 2009        Miembro del SCOR Working Group 128 on Natural and Human-Induced Hypoxia and Consequences for Coastal Areas.
- 2008        Miembro del Scientific Steering Committee, Surface Ocean-Lower Atmosphere Study (SOLAS).
2000 - 2005        Miembro del Comité Evaluador de Geología, Geología y Oceanografía de la Comisión Nacional de Acredidación de Postgrado (CONAP)
1998 - 2001
        Miembro del International Ocean Colour Coordinating Group (IOCCG).
1998 - 2000        Miembro del Coastal Pannel, Global Ocean Observing  System (GOOS).


Investigador del Programa Ciencia de Frontera 2004-2006 de la Academia Chilena de Ciencias.


Dr. Laurent Dezileau (2001 - 2003).
Dra. Heike Stevens (2004 - 2007).
Dra. Heather Bouman (2005 - 2007).
Dr. Rodrigo de la Iglesia (2008 - 2009).
Dra. Verónica Molina (2007 - presente).


Ricardo De Pol-Holtz (Doctorado, U. de Concepción, 2006).
Carolina Grob (Doctorado, U. de Concepción, 2007 ).
Paris Lavín (Doctorado, U. de Concepción, 2009).
Alexander Galán (Doctorado, U. de Concepción, 2009).

Gadiel Alarcón (Magister, U. de Concepción, 2008)


Lewis, M., O. Ulloa & T. Platt. Photosynthetic action, absorption, and quantum yield spectra for a natural population of Oscillatoria in the North Atlantic. Limnology and Oceanography, 33, 92-98, 1988.

Sathyendranath, S., T. Platt, E. P. W. Horne, W. G. Harrison, O. Ulloa, R. Outerbridge & N. Hoepffner. Estimation of new production in the ocean by compound remote sensing. Nature, 353, 129-133, 1991.

Platt, T., S. Sathyendranath, O. Ulloa, W. G. Harrison, N. Hoepffner & J. Goes. Nutrient control of phytoplankton photosynthesis in the Western North Atlantic. Nature, 356, 229-231, 1992. 

Ulloa, O., S. Sathyendranath, T. Platt & R. A. Quiñones. Light scattering by marine heterotrophic bacteria. Journal of Geophysical Research, 97, 9619-9629, 1992. 

Partensky, F., N. Hoepffner, W. K. W. Li, O. Ulloa & D. Vaulot. Photo-acclimation of Prochlorococcus sp. (Prochlorophyta) strains isolated from the North Atlantic and the Mediterranean Sea. Plant Physiology, 101, 285-296, 1993.

Ulloa, O., S. Sathyendranath & T. Platt. Effect of the particle-size distribution on the backscattering ratio in seawater. Applied Optics, 30, 7070-7077, 1994.

Fossing, H., V. A. Gallardo, B. B. Jørgensen, M. Hüttel, L. P. Nielsen, H. Schulz, D. E. Canfield, S. Foster, R. N. Glud, J. K. Gundersen, J. Küver, N. B. Ramsing, A. Teske, B. Thamdrup & O. Ulloa. Concentration and transport of nitrate by the mat-forming sulphur bacterium Thioploca. Nature, 374, 713-715, 1995.

Shaffer, G., J. Bendtsen & O. Ulloa. Fractionation during remineralization of organic matter in the ocean. Deep-Sea Research I, 46, 185-204, 1999.

Shaffer, G., O. Leth, O. Ulloa, J. Bendtsen, G. Daneri, V. Dellarossa, S. Hormazabal & P.-I. Sehlstedt. Warming and circulation change in the eastern South Pacific Ocean. Geophysical Research Letters, 27, 1247-1250, 2000.

Daneri, G., V. Dellarossa, R. Quiñones, B. Jacob, P. Montero & O. Ulloa. Primary production and community respiration in the Humboldt Current System off Chile and associated oceanic areas. Marine Ecology Progress Series, 197, 41-49, 2000.

Ulloa, O., R. Escribano, S. Hormazabal, R. A. Quiñones, R. R. González & M. Ramos. Evolution and biological effects of the 1997-98 El Niño in the upwelling ecosystem off northern Chile. Geophysical Research Letters, 28, 1591-1594, 2001.

Hormazabal, S., G. Shaffer, J. Letelier & O. Ulloa. Local and remote forcing of sea surface temperature in the coastal upwelling system off Chile. Journal of Geophysical Research, 106, 16657-16672, 2001.

Platt, T., S. Sathyendranath, A. M. Edwards, D. S. Broomhead & O. Ulloa. Nitrate supply and demand in the mixed layer of the ocean. Marine Ecology Progress Series, 254, 3-9, 2003.

Bouman, H. A., T. Platt, S. Sathyendranath, W. K. W. Li, V. Stuart, C. Fuentes-Yaco, H. Maass, E. P. W. Horne, O. Ulloa, V. Lutz & M. Kyewalyanga. Temperature as an indicator of optical properties and community structure of marine phytoplankton: implications for remote sensing. Marine Ecology Progress Series, 258, 19-30, 2003.

Stuart, V., O. Ulloa, G. Alarcón, S. Sathyendranath, H. Major, E. J. H. Head & T. Platt. Bio-optical characteristics of phytoplankton populations in the upwelling system off the coast of Chile. Revista Chilena de Historia Natural, 77, 87-105, 2004.

Dezileau, L., O. Ulloa, D. Hebbeln, F. Lamy, J.-L. Reyss & M. Fontugne. Iron control of past productivity in the coastal upwelling system off the Atacama Desert. Paleoceanography, 19, PA3012,doi:10.1029/2004PA001006, 2004.

Leth, O., G. Shaffer & O. Ulloa. Hydrography of the eastern South Pacific Ocean: Results from the Sonne 102 cruise, May-June 1995. Deep-Sea Research II, 51, 2349-2369, 2004.

Escribano, R., G. Daneri, L. Farías, V. A. Gallardo, H. E. González, D. Gutiérrez, C. B. Lange, C. E. Morales, O. Pizarro, O. Ulloa & M. Braun. Biological and chemical consequences of the 1997-1998 El Niño in the Chilean coastal upwelling system: A synthesis. Deep-Sea Research II, 51, 2389-2411, 2004.

Farías, L., M. Graco & O. Ulloa. Temporal variability of nitrogen cycling in continental-shelf sediments of the upwelling ecosystem off central Chile. Deep-Sea Research II, 51, 2491-2505, 2004.

Castro-González, M., G. Braker, L. Farías & O. Ulloa. Communities of nirS-type denitrifiers in the water column of the oxygen minimum zone in the eastern South Pacific. Environmental Microbiology, 7, 1298-1306, 2005.

Yuras, G., O. Ulloa & S. Hormazábal. On the annual cycle of coastal and oceanic satellite chlorophyll off Chile (18°-40°S). Geophysical Research Letters, 32, L23604,doi:10.1029/2005GL023946, 2005.

Sathyendranath, S., V. Stuart, T. Platt, H. Bouman, O. Ulloa & H. Maass. Remote sensing of ocean colour: Towards algorithms for retrieval of pigment composition. Indian Journal of Marine Sciences, 34, 333-340, 2005.

Devred, E., S. Sathyendranath, V. Stuart, H. Maass, O. Ulloa & T. Platt. A two-component model of phytoplankton absorption in the open ocean: Theory and applications. Journal of Geophysical Research, 111, C03011, doi:1029/2005JC002880, 2006.

De Pol-Holz, R., O. Ulloa, L. Dezileau, J. Kaiser, F. Lamy & D. Hebbeln. Melting of the Patagonian Ice Sheet and deglacial perturbations of the nitrogen cycle in the eastern South Pacific. Geophysical Research Letters, 33, L04704,doi:10.1029/2005GL024477, 2006.

Bouman. H. A, O. Ulloa, D. J. Scanlan, K. Zwirglmaier, W. K. W. Li, T. Platt, V. Stuart, R. Barlow, O. Leth, L. Clementson, V. Lutz, M. Fukasawa, S. Watanabe & S. Sathyendranath. Oceanographic basis of the global surface distribution of Prochlorococcus ecotypes. Science, 312, 918-921, 2006.

Thamdrup, B., T. Dalsgaard, M. M. Jensen, O. Ulloa, L. Farías & R. Escribano. Anaerobic ammonium oxidation in the oxygen-deficient waters off northern Chile. Limnology and Oceanography, 51, 2145-2156, 2006.

Grob, C., O. Ulloa, W. K. W. Li, G. Alarcón, M. Fukasawa & S. Watanabe. Picoplankton abundance and biomass across the eastern South Pacific Ocean along latitude 32.5°S. Marine Ecology Progress Series, 332, 53-62, 2007.

De Pol-Holz, R., O. Ulloa, F. Lamy, L. Dezileau, P. Sabatier & D. Hebbeln. Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean. Paleoceanography, 22, PA2207, doi:10.1029/2006PA001308, 2007.

Molina, V., O. Ulloa, L. Farías, H. Urrutia, S. Ramírez, P. Junier & K.-P. Witzel. Ammonia-oxidizing ß-proteobacteria from the oxygen minimum zone off northern Chile. Applied and Environmental Microbiology, 73, 3547-3555, 2007.

Lami, R., M. T. Cottrell, J. Ras, O. Ulloa, I. Obernosterer, H. Claustre, D. L. Kirchman & P. Lebaron. High abundances of aerobic anoxygenic photosynthetic bacteria in the South Pacific Ocean. Applied and Environmental Microbiology, 73, 4198-4205, 2007.

Grob, C., O. Ulloa, H. Claustre, Y. Huot, G. Alarcón & D. Marie. Contributon of picoplankton to the total particulate organic carbon concentration in the eastern South Pacific. Biogeosciences, 4, 837-852, 2007.

Zwirglmaier, K., L. Jardillier, M. Ostrowski, S. Mazard, L. Garczarek, D. Vaulot, F. Not, R. Massana, O. Ulloa & D. J. Scanlan. Global phylogeography of marine Synechococcus and Prochlorococcus reveals a distinct partitioning of lineages amongst oceanic biomes. Environmental Microbiology, 10, 147-161, 2008.

Van Wambeke, F., I. Obernosterer, T. Moutin, S. Duhamel, O. Ulloa & H. Claustre. Heterotrophic bacterial production in the eastern South Pacific: longitudinal trends and coupling with primary production. Biogeosciences, 5, 157-169, 2008.

Stevens, H., & O. Ulloa. Bacterial diversity in the oxygen minimum zone of the eastern tropical South Pacific. Environmental Microbiology, 10, 1244–1259, 2008.

Duce, R. A., J. LaRoche, K. Altieri, K. R. Arrigo, A. R. Baker, D. G. Capone, S. Cornell, F. Dentener, J. Galloway, R. S. Ganeshram, R. J. Geider, T. Jickells, M. M. Kuypers, R. Langlois, P. S. Liss, S. M. Liu, J. J. Middelburg, C. M. Moore, S. Nickovic, A. Oschlies, T. Pedersen, J. Prospero, R. Schlitzer, S. Seitzinger, L. L. Sorensen, M. Uematsu, O. Ulloa, M. Voss, B. Ward & L. Zamora. Impacts of atmospheric anthropogenic nitrogen on the open ocean. Science, 320, 893-897, 2008.

Ramí­rez-Flandes, S., & O. Ulloa. Bosque: Integrated phylogenetic analysis software. Bioinformatics, 24, 2539-2541, 2008.

Lavin, P., P. Gómez, B. González & O. Ulloa. Diversity of the marine picocyanobacteria Prochlorococcus and Synechococcus assessed by terminal restriction fragment length polymorphisms of 16S-23S ribosomal DNA internal transcribed spacer sequences. Revista Chilena de Historia Natural, 81, 515-531, 2008.

Friederich, G. E., J. Ledesma, O. Ulloa & F. P. Chavez. Air–sea carbon dioxide fluxes in the coastal southeastern tropical Pacific. Progress in Oceanography, 79, 156-166, 2008.

Galán, A., V. Molina, B. Thamdrup, D. Woebken, G. Lavik, M. M. M. Kuypers & O. Ulloa. Anammox bacteria and the anaerobic oxidation of ammonium in the oxygen minimum zone off northern Chile. Deep-Sea Research II, 56, 1021-1031, 2009.

Ullloa, O., & S. Pantoja. The oxygen minimum zone of the eastern South Pacific. Deep-Sea Research II, 56, 987-991, 2009.

De Pol-Holz, R., R. S. Robinson, D. Hebbeln, D. M. Sigmand & O. Ulloa. Controls on sedimentary nitrogen isotopes along the Chile margin. Deep-Sea Research II, 56, 1042-1054, 2009.

Revsbech. N. P., L. H. Larsen, J. Gundersen, T. Dalsgaard, O. Ulloa & B. Thamdrup. Determination of ultra-low oxygen concentrations in oxygen minimum zones by the STOX sensor. Limnology and Oceanography: Methods, 7, 371-381, 2009.

Whitmire, A. L., R. M. Letelier, V. Villagrán & O. Ulloa. Autonomous observations of in vivo fluorescence and particle backscattering in an oceanic oxygen minimum zone. Optics Express, 17, 21992-22004, 2009.

Zhang, J., D. Gilbert, A. J. Gooday, L. Levin, S. W. A. Naqvi, J. J. Middelburg, M. Scranton, W. Ekau, A. Peña, B. Dewitte, T. Oguz, P. M. S. Monteiro, E. Urban, N. N. Rabalais, V. Ittekkot, W. M. Kemp, O. Ulloa, R. Elmgren, E. Escobar-Briones, and A. K. Van der Plas. Natural and human-induced hypoxia and consequences for coastal areas: synthesis and future development. Biogeosciences, 7, 1443-1467, 2010.

Molina, V., L. Belmar & O. Ulloa. High diversity of ammonia-oxidizing archaea in permanent and seasonal oxygen-deficient waters of the eastern South Pacific. Environmental Microbiology, 12, 2450-2465, 2010.

Lavin, P., B. González, J. F. Santibáñez, D. J. Scanlan & O. Ulloa. Novel lineages of Prochlorococcus thrive within the oxygen minimum zone of the eastern tropical South Pacific. Environmental Microbiology Reports, 2, 728-738, 2010.

Canfield, D. E., F. J. Stewart, B. Thamdrup, L. De Brabandere, T. Dalsgaard, E. F. DeLong, N. P. Revsbech & O. Ulloa. A cryptic sulfur cycle in oxygen-minimum zone waters off the Chilean coast. Science, 330, 1375-1378, 2010.

Bouman, H. A., O. Ulloa, R. Barlow, W. K. W. Li, T. Platt, K. Zwirglmaier, D. J. Scanlan & S. Sathyendranath. Water-column stratification governs the community structure of subtropical marine picophytoplankton. Environmental Microbiology Reports, (in press).

Stewart, F. J., O. Ulloa & E. F. DeLong. Microbial metatranscriptomics in a permanent marine oxygen minimum zone. Environmental Microbiology, (in press).


Ulloa, O., T. Platt & S. Sathyendranath (1995). Determinación de la producción primaria mediante información satelital. In: K. Alveal, M. E. Ferrario, E. C. Oliveira, & E. Sar, editors, Manual de Métodos Ficológicos, pp. 375-384. Universidad de Concepción, Concepción, Chile.

Dellarossa, V., G. Daneri, R. Quiñones O. Ulloa & A. Vasquez (2001). Producción primaria y biomasa fraccionada por tamaño en sistemas acuáticos de distinto grado trófico. In: K. Alveal & T. Antezana, editors, Sustentabilidad de la Biodiversidad, un Problema Actual. Bases Científico-Técnicas, Teorizaciones y Proyecciones, pp. 183-198. Universidad de Concepción, Concepción, Chile.

Ulloa, O. & R. De Pol (2004). Zonas de Mínimo de Oxígeno. In: C. Werlinger, editor, Biología Marina y Oceanografía: Conceptos y Procesos, pp. 521-532. Consejo Nacional del Libro y la Lectura-Universidad de Concepción, Trama Impresores S.A., Concepción, Chile.

Karstensen, J. & O. Ulloa (2008). The Peru-Chile Current System. In: Steele, J., Thorpe, S., Turekian, K. (Eds.), Encyclopedia of Ocean Sciences 2e. Academic Press, (Online version). doi: 10.1016/B978-012374473-9.00599-3

Ulloa, O. & C. Grob (2009). Marine Pelagic Ecosystems. In: Le Quéré, C., Saltzman, E.S. (Eds.), Surface Ocean—Lower Atmosphere Processes. AGU Geophysical Research Series 187, USA, pp. 117-139.


Legget, W. C., W. R. Boynton, V. F. Galluci, L. Johnson, R. Margalef, J. McGlade, D. Mikulecky, R. Rosen, R. O. Ulloa & J. Watson (1985). Hypothesis testing and sampling design in exploited ecosystems. Canadian Bulletin of Fisheries and Aquatic Sciences, 213: 237-240.

Ulloa, O., T. Platt & S. Sathyendranath (1989). Percepción remota en oceanografía biológica: estimación de la productividad primaria. Actas del IV Simposio Latinoamericano en Percepción Remota, 2: 832-840.

Ulloa, O., N. Hoepffner & D. Larkin (1997). Depth and wavelength dependence of phytoplankton photosynthesis: implications for the remote sensing of marine primary production. In: S. G. Ackeleson & R. Frouin, editors, Ocean Optics XIII, Proceedings of SPIE, 2963, pp. 284-289.

Lange C. & O. Ulloa (2003). Center for oceanographic research opens in Chile. Eos, 84: 61-62.

Dogliotti, A. I., O. Ulloa, F. Müller-Karger, C. Hu, B. Murch, C. Taylor, G. Yuras, M. Kampel, V. Lutz, S. Gaeta, D. A. Gagliardini, C. A. E. Garcia, E. Klein, W. Helbling, R. Varela, E. Barbieri, R. Negri, R. Frouin, S. Sathyendranath & T. Platt (2005). The ANTARES observation network. Proceedings of SPIE, 5885, 58850N.


"Microbial oceanography of the oxygen-deficient waters of the eastern tropical South Pacific". SFB 754 Seminar, 10 de septiembre 2009, IFM-GEOMAR, Kiel, Alemania.

"Explorando el microcosmos marino y de paso las islas que Darwin no visitó". XXIII  Reunión Anual de la Sociedad de Biología Celular de Chile, 1-5 de noviembre 2009, Pucón, Chile.

"Analysis of the bacterial community patterns during the spring bloom cruise using T-RFLP". Spring Bloom Workshop, 30 de noviembre - 4 de diciembre 2009, Wellington, Nueva Zelanda.

"Microbial diversity and microbial community genomics in the oxygen-deficient waters off Concepcion". MI_LOCO - Agouron Workshop, 1-3 de marzo 2010, Corvallis, Oregon, USA.

"The nitrogen cycle in oxygen-deficient regions: new insights from microbial community genomics". CIFAR Oceans Workshop, 17-18 de mayo 2010 , Montreal, Canadá.

"Microbial community gene expression in an oxygen-deficient coastal ecosystem". ISME-13, 22-27 de agosto 2010, Seattle, WA, USA.

"Genomas de comunidades microbianas en acción: Metatranscriptómica en aguas marinas deficientes en oxígeno".  XXXII Congreso Chileno de Microbiología, 30 de noviembre - 3 de diciembre 2010, Antofagasta, Chile.