OREGON STATE UNIVERSITY

College of Earth, Ocean, and Atmospheric Sciences

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    Timothy Cowles

    Timothy Cowles photo
    Professor Emeritus
    Discipline: Ocean Ecology and Biogeochemistry
    Office: Burt 292
    Fax: 541-737-2064
    Email: tjc@coas.oregonstate.edu

    Research Interests

    Zooplankton ecology; copepod swimming and feeding; mesoscale and microscale links between physical, chemical, and biological processes in the sea; development of new instrumentation of biological oceanography.

    Current Research

    Role of food quality in feeding selectivity by zooplankton; biological physical interactions; zooplankton grazing processes; micro-scale plankton patterns using bio-optical instrumentation.
    Plankton/Bio-Optical Oceanography Group

    Education

    BS, Stanford University (Biology), 1973
    MS, Stanford University (Chemistry), 1973
    PhD, Duke University, 1977

    Publications

    Cowles, T.J., R.A. Desiderio, J.N. Moum, M. Myrick, D. Garvis, and S. Angel. 1990. Fluorescence microstructure using a laser/fiber optic profiler. Proc. Soc. Photo-Opt. Instrum. Eng., Ocean Optics X., 336-345

    Miller, C. B., T. J. Cowles, P. H. Wiebe, N. J. Copley, and H. Grigg. 1991. Mechanisms of the resting phase in Calanus finmarchicus (Gunnerus). Mar. Ecol. Prog. Ser. 72: 79-91

    Hood, R.R., S. Neuer, and T.J. Cowles. Autotrophic production, biomass, and species composition at two stations across an upwelling front. Mar. Ecol. Prog. Ser. 83: 221-232

    Desiderio, R.A., T.J. Cowles, J.N. Moum, and M. Myrick. 1993. Microstructure profiles of laser induced chlorophyll fluorescence spectra: Evaluation of backscatter and forward scatter fiber optic sensors. J. Atmos. Oceanic Technol. 10: 209-224

    Cowles, T.J., R.A. Desiderio, and S. Neuer. 1993. In situ characterization of phytoplankton from vertical profiles of fluorescence emission spectra. Mar. Biol. 115: 217-222

    Cowles, T.J. and R.A. Desiderio. 1993. Resolution of biological microstructure through in situ fluorescence emission spectra: an oceanographic application using optical fibers. Oceanography 6: 105-111

    Fessenden, L. and T.J. Cowles. 1994. Copepod predation on phagotrophic ciliates in Oregon coastal waters. Mar. Ecol. Prog. Ser. 107: 103-111

    Neuer, S. and T.J. Cowles. 1994. Protist herbivory in the Oregon upwelling system. Mar. Ecol. Prog. Ser. 113: 147-162

    Cowles, T.J. and L. Fessenden. 1995. Copepod grazing and finescale vertical distribution patterns during the Marine Light-Mixed Layers experiment. J. Geophys. Res. 100: 6677-6686

    Neuer, S. and T.J. Cowles. 1995. Comparative cell-specific grazing rates in field populations of ciliates and dinoflagellates. Mar. Ecol. Prog. Ser. 125: 259-267

    Desiderio, R.A., C. Moore, C. Lantz, and T.J. Cowles. 1997. Multiple excitation fluorometer for in situ oceanographic applications. Applied Optics 36: 1289-1296

    Murphy, A.M. and T.J. Cowles. 1997. Effects of darkness on multi-excitatioin in vivo fluoresence and survival in a marine diatom. Limnol. Oceanogr. 42: 1444-1453

    Cowles, T.J., R.A. Desiderio, and M-E. Carr. 1998. Small-scale planktonic structure: persistence and trophic consequences. Oceanography 11: 4-9

    Potter, N. D. and T. J. Cowles. 2000. A high-speed, wireless network for ship-to-ship and ship-to-shore data exchange. J. Atmos. Oceanic Technol. 17: 963-970

    Barth, J.A., T.J. Cowles, and S.D. Pierce. 2001. Mesoscale physical and bio-optical structure of the Antarctic Polar Front near 170o W during spring. J. Geophys. Res. 106: 13,879-13,902

    Sherr, E.B., B.F. Sherr, and T.J. Cowles. 2001. Mesoscale variability in bacterial activity in the Northeast Pacific Ocean off Oregon, USA. Aquat. Microb. Ecol. 25: 21-30

    Alldredge, A.L., T.J. Cowles, S. MacIntyre, J.E.B. Rines, P.L. Donaghay, C.F. Greenlaw, D.V. Holliday, M.M. Dekshenieks, J.M. Sullivan, J.R.V. Zaneveld. 2002. Occurrence and mechanisms of formation of a dramatic thin layer of marine snow in a shallow Pacific fjord. Mar. Ecol. Prog. Ser. 233: 1-12.

    Barth, J.A., T.J. Cowles, P.M. Kosro, R.K. Shearman, A. Huyer, and R.L. Smith. 2002. Injection of carbon from the shelf to offshore beneath the euphotic zone in the California Current. J. Geophys. Res. 107:

    Eisner, L., M. Twardowski, T. Cowles, and M.J. Perry. 2003. Resolving phytoplankton photoprotective:photosynthetic carotenoid ratios on fine scales using in situ spectral absorbtion measurements. Limnol. Oceanogr. 48: 632-646

    Cowles, T.J. 2003. Planktonic layers: physical and biological interactions on the small scale. In: Handbook of Scaling Methods in Aquatic Ecology: Measurements, Analysis, Simulation. CRC Press, Boca Raton, FL.

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