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OHMAN, MARK

Professor of Biological Oceanography

Curator of Pelagic Invertebrates

Degrees:

• B.A., University of California, Santa Cruz
• M.A., California State University, San Francisco
• Ph.D., University of Washington

Research Interests:

• Population ecology of marine zooplankton, especially planktonic copepods
• Mortality estimation and other demographic techniques
• Zooplankton prey-predator interactions
• Climate change effects on California Current pelagic food webs
• California Current Ecosystem LTER site
• Autonomous measurement methods (Spray ocean gliders, moorings)

Courses Recently Taught:

• SIO 271: Marine Zooplankton
• SIO 278: Seminar in Ocean Biosciences
• SIO 279: Sp Top/Biological Oceanography
• SIO270: Pelagic Ecology
• SIO271: Marine Zooplankton
• SIO278: Seminar in Ocean Biosciences
• SIO279: Sp Top/Biological Oceanography

Honors and Awards:

• Editor's Citation, Outstanding Service as Reviewer, Limnology and Oceanography
• Editor's Citation for Excellence in Refereeing, Journal of Geophysical Research, Oceans
• UCSD Community Champion Award (for diversity enhancement), 2004

Mentoring:

• Goldstein, Miriam (Graduate; 2009-)
• Langland, Todd (Undergrad; 2008-)
• Tsyrklevich, Kate (Undergrad; 2007-2008)
• Cawood, Alison (Graduate; 2005-)
• Powell, Jesse (Graduate; 2005-)
• Stukel, Michael (Graduate; 2005-)
• Hull, Pincelli (Graduate; 2003-)
• McFarland, Jessica (Graduate; 2003-2005)
• Hsieh, Chih-hao (Graduate; 2001-2006)
• Carter, Brendan (Undergrad; 2000-2002)
• Reineman, Daniel (Undergrad; 2000-2002)
• Romagnan, Jean-Baptiste (Graduate; 2000-2007)
• Goetze, Erica (Graduate; 1998-2004)
• Field, David (Graduate; 1997-2004)
• Eiane, Ketil (Graduate; 1996-2001)
• De Robertis, Alex (Graduate; 1995-2001)
• Juhl, Andrew (Graduate; 1993-1996)
• , (Graduate; -)
• Abramzon, Daniel (Undergrad; -2001)
• Carriker, Brenden (Undergrad; -2001)
• Grover, Crystal (Undergrad; -2000)
• Lavaniegos, Bertha (Post Doc; -2005)
• Logerwell, Elizabeth (Post Doc; -1999)
• Quach, Lan (Undergrad; -2000)
• Rovira-Pena, Wilson (Other; -2003)
• Said, Saema (Undergrad; -1999)
• Snyder, Richard (Post Doc; -1991)
• Tang, Chai (Undergrad; -1998)
• Vuong, Doris (Undergrad; -1996)

Gorsky, G., M. D. Ohman, M. Picheral, S. Gasparini, L. Stemmann, J.-B. Romagnan, A. Cawood, S. Pesant, C. García-Comas, and F. Prejger 2010. Digital zooplankton image analysis using the ZooScan integrated system. J. Plank. Res. 32: 285-303.

Décima, M., M. D. Ohman, and A. DeRobertis 2010. Body size-dependence of euphausiid spatial patchiness. Limnol. Oceanogr. 55: 777-788.

Goetze, E., and M. D. Ohman 2010. Integrated molecular and morphological biogeography of the calanoid copepod family Eucalanidae. Deep-Sea Res. II (in press).

Landry, M. R., M. D. Ohman, R. Goericke, M. R. Stukel, and K. Tsyrklevitch 2009. Lagrangian studies of phytoplankton growth and grazing relationships in a coastal upwelling ecosystem off Southern California. Progr. Oceanogr. 83: 208-216.

Aksnes, D. L., and M. D. Ohman 2009. Multi-decadal shoaling of the euphotic zone in the southern sector of the California Current System. Limnol. Oceanogr. 54: 1272-1281.

Ohman, M. D., and C.-H. Hsieh 2008. Spatial differences in mortality of Calanus pacificus within the California Current System. J. Plank. Res. 30: 359-366.

Davis, R. E., M. D. Ohman, D. L. Rudnick, J. T. Sherman, and B. Hodges 2008. Glider surveillance of physics and biology in the southern California Current System. Limnol. Oceanogr. 53: 2151-2168.

Ohman, M. D., E. G. Durbin, J. A. Runge, B. K. Sullivan, and D. B. Field 2008. Relationship of predation potential to mortality of Calanus finmarchicus on Georges Bank, northwest Atlantic. Limnol. Oceanogr. 53: 1643-1655.

Lavaniegos, B. E., and M. D. Ohman 2007. Coherence of long-term variations of zooplankton in two sectors of the California Current System. Progr. Oceanogr. 75: 42-69.

Aksnes, D. L., M. D. Ohman, and P. Rivière 2006. Optical effect on the nitracline in a coastal upwelling area. Limnol. Oceanogr. 52: 1179-1187.

Field, D. B., T. R. Baumgartner, C. D. Charles, V. Ferreira-Bartrina, and M. D. Ohman 2006. Planktonic foraminifera of the California Current reflect twentieth century warming. Science 311: 63-66.

Hereu, C. M., B. E. Lavaniegos, G. Gaxiola-Castro, and M. D. Ohman 2006. Composition and potential grazing impact of salps off Baja California during the 1997-1999 El Niño and La Niña. Mar. Ecol. Progr. Ser. 318: 123-140.

Hsieh, C.-H., and M. D. Ohman 2006. Biological responses to environmental forcing: The Linear Tracking Window hypothesis. Ecology 87: 1932-1938.

Mackas, D. L., W. T. Peterson, M. D. Ohman, and B. E. Lavaniegos 2006. Zooplankton anomalies in the California Current system before and during the warm ocean conditions of 2005. Geophysical Research Letters 33: Art. No. L22S07 NOV 18 2006.

Sydeman, W. J., R. W. Bradley, P. Warzybok, C. L. Abraham, J. Jahncke, K. D. Hyrenbach, V. Kousky, J. M. Hipfner, and M. D. Ohman 2006. Planktivorous Auklet Ptychoramphus aleuticus responses to ocean climate, 2005: Unusual atmospheric blocking? Geophysical Research Letters 33: Art. No. L22S09 OCT 21 2006.

Eiane, K., and M. D. Ohman 2004. Stage specific mortality of Calanus finmarchicus, Pseudocalanus elongatus and Oithona similis on Fladen Ground, North Sea, during a spring bloom. Mar. Ecol. Progr. Ser. 268: 183-193.

Ohman, M. D., K. Eiane, E. G. Durbin, J. A. Runge, and H.-J. Hirche 2004. A comparative study of Calanus finmarchicus mortality patterns at five localities in the North Atlantic. ICES J. Mar. Sci. 61: 687-697.

Durbin, E. G., R. G. Campbell, M. C. Casas, B. Niehoff, J. Runge, M. Wagner, and M. D. Ohman 2003. Interannual variation in phytoplankton blooms and zooplankton productivity and abundance in the Gulf of Maine during winter. Mar. Ecol. Progr. Ser. 254: 81-100.

Lavaniegos, B. E., and M. D. Ohman 2003. Long term changes in pelagic tunicates of the California Current. Deep-Sea Res. II 50: 2493-2518.

Ohman, M. D., and E. L. Venrick 2003. CalCOFI in a changing ocean. Oceanography 16: 76-85.

Rau, G. H., M. D. Ohman, and A. C. Pierrot-Bults 2003. Linking nitrogen dynamics to climate variability off Central California: A 51 year record based on 15N/14N in CalCOFI zooplankton. Deep-Sea Res. II 50: 2451-2467.

Batchelder, H. P., J. A. Barth, P. M. Kosro, P. T. Strub, R. D. Brodeur, W. T. Peterson, C. T. Tynan, M. D. Ohman, L. W. Botsford, T. M. Powell, F. B. Schwing, D. G. Ainley, D. L. Mackas, B. M. Hickey, and S. R. Ramp 2002. The GLOBEC Northeast Pacific California Current System program. Oceanography 15: 36-47.

Eiane, K., D. L. Aksnes, M. D. Ohman, S. Wood, and M. B. Martinussen 2002. Stage-specific mortality of Calanus spp. under different predation regimes. Limnol. Oceanogr. 47: 636-645.

Ohman, M. D., J. A. Runge, E. G. Durbin, D. B. Field, and B. Niehoff 2002. On birth and death in the sea. Hydrobiologia 480: 55-68.

Ohman, M. D., and B. E. Lavaniegos 2002. Comparative zooplankton sampling efficiency of a ring net and bongo net with comments on pooling of subsamples. CalCOFI Rept. 43: 162-173.

Ohman, M. D., and H.-J. Hirche 2001. Density-dependent mortality in an oceanic copepod population. Nature 412: 638-641.

DeRobertis, A., J. S. Jaffe, and M. D. Ohman 2000. Size-dependent visual predation risk and the timing of vertical migration in zooplankton. Limnol. Oceanogr. 45: 1838-1844.

Brinton, E., M. D. Ohman, A. W. Townsend, M. D. Knight, and A. L. Bridgeman 1999. Euphausiids of the World Ocean, CD-ROM, MacIntosh version 1.0 ed. UNESCO Publishing.

DeRobertis, A., and M. D. Ohman 1999. A free-drifting mimic of vertically migrating zooplankton. J. Plank. Res. 21: 1865-1875.

Jaffe, J. S., M. D. Ohman, and A. DeRobertis 1999. Sonar estimates of daytime activity levels of Euphausia pacifica in Saanich Inlet. Can. J. Fish. Aquat. Sci. 56: 2000-2010.

Lavaniegos, B. E., and M. D. Ohman 1999. Hyperiid amphipods as indicators of climate change in the California Current, p. 489-509. In [eds.], F. R. Schram and J. C. von Vaupel Klein Crustaceans and the Biodiversity Crisis. Proceedings of the Fourth International Crustacean Congress, Amsterdam, The Netherlands, July 20-24, 1998, Vol. I. Brill.

Logerwell, E. A., and M. D. Ohman 1999. Egg-brooding, body size and predation risk in planktonic marine copepods. Oecologia 121 : 426-431.

Eiane, K., D. L. Aksnes, and M. D. Ohman 1998. Advection and zooplankton fitness. Sarsia 83: 87-93.

Jaffe, J. S., M. D. Ohman, and A. DeRobertis 1998. OASIS in the sea: measurement of the acoustic reflectivity of zooplankton with concurrent optical imaging. Deep-Sea Res. II 45: 1239-1253.

Ohman, M. D., A. V. Drits, M. E. Clarke, and S. Plourde 1998. Differential dormancy of co-occurring copepods. Deep-Sea Res. II 45: 1709-1740.

Ohman, M. D., and A. W. Townsend 1998. Egg strings in Euchirella pseudopulchra (Aetideidae) and comments on constraints on egg brooding in planktonic marine copepods. J. Mar. Sys. 15: 61-69.

Aksnes, D. L., C. B. Miller, M. D. Ohman, and S. N. Wood 1997. Estimation techniques used in studies of copepod population dynamics -- a review of underlying assumptions. Sarsia 82: 279-296.

Ohman, M. D. 1997. On the determination of zooplankton lipid content and the occurrence of gelatinous copepods. J. Plank. Res. 19: 1235-1250.