Research Interests
I am a biological oceanographer/marine microbial ecologist
who addresses the fundamental question: “What
factors control phytoplankton growth, their nutrition
and distribution in the ocean?” More specifically,
how do the multiple interactions of light, and macro-
and micro-nutrients, affect the physiology of marine
phytoplankton and bacteria, and hence determine their
growth rates, biochemical processes, and distribution
patterns in the sea from coastal to oceanic environments.
My laboratory
has been studying phytoplankton in unialgal cultures
and during field studies ranging from polar
to equatorial waters. Recently, much of our efforts
have been directed towards the study of toxic microalgae
that form Harmful Algal Blooms (HABs) both locally
in San Francisco Bay, adjacent coastal waters, and
elsewhere including the Pacific Northwest and Asia.
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Selected Papers
Cochlan,
W.P. 2001. The heterotrophic bacterial response during
a mesoscale iron enrichment experiment (Iron Ex II)
in the eastern equatorial Pacific Ocean. Limnol. Oceanogr.
46: 428-435.
Cochlan, W.P., and D.A. Bronk. 2001.
Nitrogen uptake kinetics in the Ross Sea, Antarctica.
Deep-Sea Res. II 48: 4127-4153.
Cochlan, W.P., D.A. Bronk, and K.H.
Coale. 2002. Trace metals and nitrogenous nutrition
of Antarctic phytoplankton: experimental observations
in the Ross Sea. Deep-Sea Res II 49: 3365-3390.
Cochlan, W.P., and D.A. Bronk. 2003.
Effects of ammonium on nitrate utilization in the
Ross Sea: Implications for ƒ-ratio estimates.
In: G. DiTullio, G.R, Dunbar, R.B. [Eds.], Biogeochemistry
of the Ross Sea. AGU Antarctic Research Series 78:
159-178.
Coale, K.H., and others including W.P. Cochlan.
2004. Southern Ocean Iron Enrichment Experiment: Carbon
Cycling in High- and Low-Si Waters. Science 304: 408-414.
Wells, M.L., C.R. Trick, W.P. Cochlan,
M.P. Hughes, and V.L. Trainer. 2005. The synergy of
iron, copper and the toxicity of diatoms. Limnol.
Oceanogr. 50: 1908-1917.
Hickey, B., A. MacFadyen, W.P. Cochlan,
R.M. Kudela, K. Bruland, and C.G. Trick. 2006. Evolution
of water column physical, chemical and biological
properties in the Pacific Northwest following the
delayed onset of local upwelling. Geophys. Res Lett.
33: L22S02.
Kudela, R.M., W.P. Cochlan, T.D.
Peterson, and C.G. Trick. 2006. Impacts on phytoplankton
biomass and productivity in the Pacific Northwest
during the warm ocean conditions of 2005. Geophys.
Res Lett. 33: L22S06.
Armstrong Howard, M.D., W.P. Cochlan,
N.C. Ladizinsky, and R.M. Kudela. 2007. Nitrogenous
preference of toxigenic Pseudo-nitzschia australis
(Bacillariophyceae) from field and laboratory experiments.
Harmful Algae 6: 206-217.
Herndon, J., and W.P. Cochlan. 2007.
Nitrogen utilization by the raphidophyte Heterosigma
akashiwo: growth and uptake kinetics in laboratory
cultures. Harmful Algae 6: 260-270.
Trainer, V.L., W.P. Cochlan, A. Erickson,
B.D. Bill, F.H. Cox, J.A. Borchert and K.A. Lefebvre.
2007. Recent domoic acid closures of shellfish harvest
areas in Washington State inland waterways. Harmful
Algae (In press).
Cochlan, W.P. (Accepted). Nitrogen
Uptake in the Southern Ocean. In: Nitrogen in the
Marine Environment, D. Capone, E. Carpenter, M. Mulholland,
and D. Bronk [Eds.]. (Invited review chapter).
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