Index Catalog // ScholarsArchive@OSU

Abandoning Sverdrup’s critical depth hypothesis on phytoplankton blooms

Creator:: Behrenfeld, Michael J.
Abstract:: The Critical Depth Hypothesis formalized by Sverdrup in 1953 posits that vernal phytoplankton blooms occur when surface mixing shoals to a depth shallower than a critical depth horizon defining the point where phytoplankton growth exceeds losses. This hypothesis has since served as a cornerstone in plankton ecology and reﬂects the...
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Full Text:: phytoplankton blooms MICHAEL J. BEHRENFELD1 Department of Botany and Plant Pathology, Cordley Hall 2082

Advancing interpretations of ¹⁴C-uptake measurements in the context of phytoplankton physiology and ecology

Creator:: Milligan, Allen J., Halsey, Kimberly H., and Behrenfeld, Michael J.
Abstract:: The ¹⁴C-uptake method is the most common approach employed for estimating primary production in the ocean. Normalizing ¹⁴C-uptake to chlorophyll a and time yields a value termed the assimilation number, which is thought to reflect phytoplankton physiology. It is often assumed that the measured rate of ¹⁴C-uptake is between net...
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Full Text:: AND MICHAEL J. BEHRENFELD1* 1 DEPARTMENT OF BOTANY AND PLANT PATHOLOGY, OREGON STATE UNIVERSITY

Fluorescence and nonphotochemical quenching responses to simulated vertical mixing in the marine diatom Thalassiosira weissflogii

Creator:: Milligan, Allen J., Aparicio, Uriel A., and Behrenfeld, Michael J.
Abstract:: The fluorescence signal emitted from phytoplankton exposed to natural sunlight has been considered a potentially useful tool to examine phytoplankton physiology from in situ radiometers and satellites, but variability in the fluorescence signal is confounded by non-photochemical quenching (NPQ). This pathway dissipates excitation energy as heat rather than fluorescence. It...
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Full Text:: Allen J. Milligan*, Uriel A. Aparicio, Michael J. Behrenfeld Department of Botany and Plant Pathology

Regional variations in the influence of mesoscale eddies on near-surface chlorophyll

Creator:: Gaube, Peter, McGillicuddy, Dennis J., Jr., Chelton, Dudley B., Behrenfeld, Michael J., and Strutton, Peter G.
Abstract:: Eddies can influence biogeochemical cycles through a variety of mechanisms, including the excitation of vertical velocities and the horizontal advection of nutrients and ecosystems, both around the eddy periphery by rotational currents and by the trapping of fluid and subsequent transport by the eddy. In this study, we present an...
Resource Type:: Article
Full Text:: -surface chlorophyll Gaube, P., McGillicuddy Jr., D. J., Chelton, D. B., Behrenfeld, M. J., & Strutton, P

Geostationary satellite observations of dynamic phytoplankton photophysiology

Creator:: O'Malley, Robert T., Behrenfeld, Michael J., Westberry, Toby K., Milligan, Allen J., Shang, Shaoling, and Yan, Jing
Abstract:: Since June 2010, the Geostationary Ocean Color Imager (GOCI) has been collecting the first diurnally resolved satellite ocean measurements. Here GOCI retrievals of phytoplankton chlorophyll concentration and fluorescence are used to evaluate daily to seasonal changes in photophysiological properties. We focus on nonphotochemical quenching (NPQ) processes that protect phytoplankton from...
Resource Type:: Article

Satellite observations of chlorophyll, phytoplankton biomass, and Ekman pumping in nonlinear mesoscale eddies

Creator:: Gaube, P., Chelton, D. B., Strutton, P. G., and Behrenfeld, Michael J.
Abstract:: Nonlinear mesoscale eddies can influence biogeochemical cycles in the upper ocean through vertical and horizontal advection of nutrients and marine organisms. The relative importance of these two processes depends on the polarity of an eddy (cyclones versus anticyclones) and the initial biological conditions of the fluid trapped in the core...
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Full Text:: . B. Chelton, P. G. Strutton, and M. J. Behrenfeld (2013), Satellite observations of chlorophyll

Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom

Creator:: Behrenfeld, Michael J., Doney, Scott C., Lima, Ivan, Boss, Emmanuel S., and Siegel, David A.
Abstract:: Satellite measurements allow global assessments of phytoplankton concentrations and, from observed temporal changes in biomass, direct access to net biomass accumulation rates (r). For the subarctic Atlantic basin, analysis of annual cycles in r reveals that initiation of the annual blooming phase does not occur in spring after stratification surpasses...
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Full Text:: recovery underlying the subarctic Atlantic spring plankton bloom Michael J. Behrenfeld,1 Scott C. Doney,2

Global net community production and the putative net heterotrophy of the oligotrophic oceans

Creator:: Westberry, Toby K., Williams, Peter J. le B., and Behrenfeld, Michael J.
Abstract:: Reconciling rates of organic carbon export from the euphotic zone with the consumption of organic material in the dark ocean remains one of the major quantitative uncertainties of the ocean carbon cycle. Euphotic zone net community production (NCP) provides one broad constraint on export flux and potential carbon drawdown. However,...
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Full Text:: Michael J. Behrenfeld1 Received 17 April 2011; revised 1 October 2012; accepted 17 October 2012

Photoacclimation of natural phytoplankton communities

Creator:: Graff, Jason R., Westberry, Toby K., Milligan, Allen J., Brown, Matthew B., Dall’Olmo, Giorgio, Reifel, Kristen M., and Behrenfeld, Michael J.
Abstract:: ABSTRACT: Phytoplankton regulate internal pigment concentrations in response to light and nutrient availability. Chlorophyll a to phytoplankton carbon ratios (chl:C phyto) are commonly reported as a function of growth irradiance (Eg) for evaluating the photoacclimation response of phytoplankton. In contrast to most culture experiments, natural phytoplankton communities experience fluctuating environmental...
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Full Text:: . Brown1, Giorgio Dall’Olmo2, Kristen M. Reifel1, Michael J. Behrenfeld1 1Oregon State University

Global assessment of ocean carbon export by combining satellite observations and food-web models

Creator:: Siegel, D. A., Buesseler, K. O., Doney, S. C., Sailley, S. F., Behrenfeld, Michael J., and Boyd, P. W.
Abstract:: The export of organic carbon from the surface ocean by sinking particles is an important, yet highly uncertain, component of the global carbon cycle. Here we introduce a mechanistic assessment of the global ocean carbon export using satellite observations, including determinations of net primary production and the slope of the...
Resource Type:: Article

ScholarsArchive@OSU

Abandoning Sverdrup’s critical depth hypothesis on phytoplankton blooms

Advancing interpretations of ¹⁴C-uptake measurements in the context of phytoplankton physiology and ecology

Fluorescence and nonphotochemical quenching responses to simulated vertical mixing in the marine diatom Thalassiosira weissflogii

Regional variations in the influence of mesoscale eddies on near-surface chlorophyll

Geostationary satellite observations of dynamic phytoplankton photophysiology

Satellite observations of chlorophyll, phytoplankton biomass, and Ekman pumping in nonlinear mesoscale eddies

Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom

Global net community production and the putative net heterotrophy of the oligotrophic oceans

Photoacclimation of natural phytoplankton communities

Global assessment of ocean carbon export by combining satellite observations and food-web models

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