Osvaldo Ulloa, PhD.

Director @ IMO
Professor @ UDEC

Contact

oulloa@udec.cl
orcID

Roles

Director @ IMO
Associate Researcher @ IMO

Education

Doctor in Oceanography @ UDEC

Biography

Dr. Osvaldo Ulloa (Chile, 1961) received his Master's (1987) and his PhD (1992) from Dalhousie University, Canada, working in phytoplankton ecology and marine bio-optics, respectively. His postdoctorate work was carried out at the Niels Böhr Institute of the University of Copengague, where he worked in the carbon cycle.

Dr. Ulloa returned to Chile in 1997 and joined the University of Concepcion, where he is currently a full Professor at the Department of Oceanography. He has trained undergraduate and graduate students in marine biology and oceanography. He has received several postdoctoral fellows, from Chile and abroad, in his lab. For over a decade, he has been one of the organizers and co-directors of the international course “Ecology and Diversity of Marine Microorganisms (ECODIM)” which has proven to be fundamental in the creation of a new generation of marine microbial ecologists in Latin America.

His most relevant scientific contributions have been in the area of biological oceanography, particularly in the study of the factors that determine the distribution patterns of phytoplankton and the microbial diversity and biogeochemistry of oxygen defficient marine environments.

Dr. Ulloa’s research focus at the Millennium Institute of Oceanography are microbial communities, including their diversity, their role in biogeochemical cycles and their genomic adaptations to oxygen defficiency and to depth.

Besides the development of his research lines, Dr. Ulloa participates in international working groups (e.g. SCOR) in his areas of expertise.

Students

Tutor of

Publications

Plankton respiration in the Atacama Trench region: Implications for particulate organic carbon flux into the hadal realm

Limnology and Oceanography | Volume 9999, Pages 1-15

doi:10.1002/lno.11866June, 2021

Fernández-Urruzola, I.Ulloa, O.Glud, R.NPinkerton, M.HSchneider, W.Wenzhöfer, F.Escribano, R.

Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean

Marine Biodiversity | Volume 51, Pages 1-20

doi:10.1007/s12526-021-01182-zMay, 2021

Weston, J.N.JEspinosa, L.Wainwright, J.AStewart, E.C.DGonzález, C.E.Hidalgo, P.Oliva, M.E.Escribano, R.Ulloa, O......,

Flow cytometry with cell sorting and sequencing as a tool for the study of the stomach microbiota of the Humboldt Current krill (Euphausiacea)

Journal of Crustacean Biology | Volume 41, Article ruab006

doi:10.1093/jcbiol/ruab006April, 2021

The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean

Proceedings of the National Academy of Sciences of the United States of America | Volume 118, Issue 11, Pages 1-6

doi:10.1073/pnas.2025638118March, 2021

Ulloa, O.Henríquez, C.Ramírez-Flandes, S.Murillo, A.A.M. Plominsky, A.Morgan-Lang, C.Hallam, S.J

The Influence of pCO2-Driven Ocean Acidification on Open Ocean Bacterial Communities during A Short-Term Microcosm Experiment in the Eastern Tropical South Pacific (ETSP) off Northern Chile

Potential virus-mediated nitrogen cycling in oxygen-depleted oceanic waters

ISME Journal

doi:10.1038/s41396-020-00825-6November, 2020

Gazitúa, M.CVik, D.RRoux, S.Gregory, A.CBolduc, B.Winder, B.Mulholland, M.RHallam, S.JUlloa, O.Sullivan, M.B

Genome‐resolved viral ecology in a marine oxygen minimum zone (OMZ)

Environmental Microbiology

doi:10.1111/1462-2920.15313November, 2020

Vik, D.Gazitúa, M. CSun, C.L Zayed, A. AAldunate, M.Mulholland, M.RUlloa, O.Sullivan, M.B

Distinct oxygen environments shape picoeukaryote assemblages thriving oxygen minimum zone waters off central Chile

Journal of Plankton Research | Volume 42, Pages 514-529

doi:10.1093/plankt/fbaa036October, 2020

De la Iglesia, R.Echenique-Subiabre, I.Rodríguez-Marconi, S.Espinoza, J.PVon Dassow, P.Ulloa, O.Trefault, N.

Spatiotemporal Distribution of Key Pelagic Microbes in a Seasonal Oxygen-Deficient Coastal Upwelling System of the Eastern South Pacific Ocean

Frontiers in Marine Science | Volume 7, Pages 1-17

doi:10.3389/fmars.2020.561597September, 2020

Molina, V.Belmar, L.Levipan, H.ARamírez-Flandes, S.Anguita, C.Galán, A.Montes, I.Ulloa, O.

Autotrophic carbon fixation pathways along the redox gradient in oxygen‐depleted oceanic waters

Environmental Microbiology Reports | Volume 12, Issue 3, Pages 334-341

doi:10.1111/1758-2229.12837June, 2020

Genetic diversity and novel lineages in the cosmopolitan copepod Pleuromamma abdominalis in the Southeast Pacifc

Scientific Reports | Volume 10, Pages 1-15

doi:10.1038/s41598-019-56935-5January, 2020

Monitoring Microbial Communities in the Marine Environment

Cytometry Part A | Volume 95, Pages 717-721

doi:10.1002/cyto.a.23763July, 2019

Sampling and processing methods impact microbial community structure and potential activity in a seasonally anoxic fjord: Saanich Inlet, British Columbia

Frontiers in Marine Science | Volume 6, Article 132

doi:10.3389/fmars.2019.00132March, 2019

Torres-Beltrán, M.Mueller, A.Scofield, MPachiadaki, M.G.Taylor, C.Tyshchenko, K...Ulloa, O....Hallam, S.J.

Redox traits characterize the organization of global microbial communities

Proceedings of the National Academy of Sciences of the United States of America | Volume 116, Issue 9, Pages 3630-3635

doi:10.1073/pnas.1817554116February, 2019

Nitrogen assimilation in picocyanobacteria inhabiting the oxygen‐deficient waters of the eastern tropical North and South Pacific

Limnology and Oceanography | Volume 65, Pages 437-453

doi:10.1002/lno.11315February, 2019

Aldunate, M.Henríquez, C.Ji, Q.Lueders-Dumont, J.Mulholland, M.R.B. Ward, B.Von Dassow, P.Ulloa, O.

Single cell genomic and transcriptomic evidence for the use of alternative nitrogen substrates by anammox bacteria

ISME Journal | Volume 12, Issue 11, Pages 2706-2722

doi:10.1038/s41396-018-0223-9November, 2018

Ganesh, S.Bertagnolli, A.Bristow, L.A.Padilla, C.C.Blackwood, N.Aldunate, M.Bourbonnais, A.Altabet, M.A.Malmstrom, R.R.Woyke, T.Ulloa, O.Konstantinidis, K.T.Thamdrup, B.Stewart, F.J.

Oxygen modulates bacterial community composition in the coastal upwelling waters off central Chile

Deep-Sea Research Part II: Topical Studies in Oceanography | Volume 156, Pages 68-79

doi:10.1016/j.dsr2.2018.02.001October, 2018

Decrypting the sulfur cycle in oceanic oxygen minimum zones

ISME Journal | Volume 12, Issue 9, Pages 2322-2329

doi:10.1038/s41396-018-0149-2September, 2018

Crowe, S.A.Cox, R.P.Jones, C.A.Fowle, D.A.Santibañez-Bustos, J.F.Ulloa, O.Canfield, d.E.

Distinctive archaeal composition of an artisanal crystallizer pond and functional insights into salt-saturated hypersaline environment adaptation.

Frontiers in Microbiology | Volume 9, Article 1800

doi:10.3389/fmicb.2018.01800August, 2018

Plominsky, A.M.Henríquez, C.Delherbe, N.Podell, S.Ramírez-Flandes, S.Ugalde, J.A.Santibañez, J.F.Van Den Engh, G.JHanselmann, K.Ulloa, O.De la Iglesia, R.Allen, E.E.Trefault, N.

Metabolic potential and in situ transcriptomic profiles of previously uncharacterized key microbial groups involved in coupled carbon, nitrogen, and sulfur cycling in anoxic marine zones

Environmental Microbiology | Volume 20, Issue 8, Pages 2727-2742

doi:10.1111/1462-2920.14109August, 2018

Plominsky, A.M.Trefault, N.Podell, S.Blanton, J. M.De la Iglesia, R.Allen, E. E.Von Dassow, P.Ulloa, O.

Hydrography shapes community composition and diversity of amoA containing Thaumarcheota in the coastal waters off central Chile

Environmental Microbiology Reports | Volume 9, Issue 6, Pages 717-728

doi:10.1111/1758-2229.12579December, 2017

Cryptic oxygen cycling in anoxic marine zones

Proceedings of the National Academy of Sciences of the United States of America | Volume 114, Issue 31, Pages 8319-8324

doi:10.1073/pnas.1619844114August, 2017

Garcia-Robledo, E.Padilla, C.C.Aldunate, M.Stewart, F.J.Ulloa, O.Paulmier, A.Gregori, G.Revsbech, N.P.

Diversity and transcriptional levels of RuBisCO form II of sulfur-oxidizing γ-proteobacteria in coastal-upwelling waters with seasonal anoxia

Frontiers in Marine Science | Volume 4, Issue 213, Pages 1-12

doi:10.3389/fmars.2017.00213July, 2017

A review of protist grazing below the photic zone emphasizing studies of oxygen-depleted water columns and recent applications of in situ approaches

Frontiers in Marine Science | Volume 4, Article 105

doi:10.3389/fmars.2017.00105April, 2017

Medina, L.E.Taylor, C.D.Pachiadaki, M.G.Henríquez, C.Ulloa, O.Edgcomb, V.P.

Vertical modeling of the nitrogen cycle in the eastern tropical South Pacific oxygen deficient zone using high-resolution concentration and isotope measurements

Global Biogeochemical Cycles | Volume 30, Issue 10, Pages 1661-1681

doi:10.1002/2016GB005415November, 2016

Peters, B.Babbin, A.Lettmann, K.Mordy, C.Ulloa, O.Ward, B.Casciotti, K.

Ammonium and nitrite oxidation at nanomolar oxygen concentrations in oxygen minimum zone waters

Proceedings of the National Academy of Sciences of the United States of America | Volume 113, Issue 38, Pages 10601-10606

doi:10.1073/pnas.1600359113September, 2016

Bristow, L.A.Dalsgaard, T.Tiano, L.Mills, D.B.Bertagnolli, A.Wright, J.J.Hallam, S.J.Ulloa, O.Canfield, D.E.Revsbech, N.P.Thamdrup, B.

Genomic potential for nitrogen assimilation in uncultivated members of Prochlorococcus from an anoxic marine zone

ISME Journal | Volume 9, Pages 1264-1267

doi:10.1038/ismej.2015.21April, 2015

Astorga-Eló, M.Ramírez-Flandes, S.DeLong, E.F.Ulloa, O.

Structure of denitrifying communities reducing N2O at suboxic waters off northern Chile and Perú

Revista de Biología Marina y Oceanografía | Volume 50, Issue 1, Pages 95-110

doi:10.4067/S0718-19572015000100008April, 2015

Castro-González, M.Ulloa, O.Farías, L.

Metagenome Sequencing of the Microbial Community of a Solar Saltern Crystallizer Pond at Cáhuil Lagoon, Chile

Genome Announcements | Volume 2, Pages 1-3

doi:10.1128/genomeA.01172-14.December, 2014

Plominsky, A. MDelherbe, N.Ulloa, O.De la Iglesia, R.Von Dassow, P.van den Engh, G.Trefault, N....

The first report of a microdiverse anammox bacteria community in waters of Colombian Pacific, a transition area between prominent oxygen minimum zones of the eastern tropical Pacific

Environmental Microbiology Reports | Volume 6, Pages 595-604

doi:10.1111/1758-2229.12165November, 2014

Castro-González, M.Molina, V.Rodríguez-Rubio, E.Ulloa, O.

Oxygen at nanomolar levels reversibly suppresses process rates and gene expression in anammox and denitrification in the oxygen minimum zone off Northern Chile

mBio | Volume 5, Issue 6, Pages 1-14

doi:10.1128/mBio.01966-14October, 2014

Dalsgaard, T.Stewart, F.J.Thamdrup, B.De Brabandere, L.Revsbech, N.P.Ulloa, O.Canfield, D.E.DeLong, E.F.

Oxygen distribution and aerobic respiration in the north and south eastern tropical pacific oxygen minimum zones

Deep-Sea Research Part I: Oceanographic Research Papers | Volume 94, Pages 173-183

doi:10.1016/j.dsr.2014.10.001October, 2014

Tiano, L.García-Robledo, E.Dalsgaard, T.Devol, A.Ward, B.B.Ulloa, O.

Vertical partitioning of nitrogen-loss processes across the oxic-anoxic interface of an oceanic oxygen minimum zone

Environmental Microbiology | Volume 16, Issue 10, Pages 3014-3054

doi:10.1111/1462-2920.12255October, 2014

De Brabandere, L.Canfield, D.E.Dalsgaard, T.Friederich, G.E.Revsbech, N.P.Ulloa, O.Thamdrup, B.

Enhanced metabolic versatility of planktonic sulfur-oxidizing γ-proteobacteria in an oxygen-deficient coastal ecosystem

Frontiers in Marine Science | Volume 1, Issue 18, Pages 1-13

doi:10.3389/fmars.2014.00018July, 2014

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