Index Catalog // ScholarsArchive@OSU

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...
Resource Type:: Article

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...
Resource Type:: Article

Creator:: Graff, Jason R., Westberry, Toby K., Milligan, Allen J., Brown, Matthew B., Dall'Olmo, Giorgio, van Dongen-Vogels, Virginie, Reifel, Kristen M., and Behrenfeld, Michael J.
Abstract:: The measurement of phytoplankton carbon (C[subscript]phyto) in the field has been a long-sought but elusive goal in oceanography. Proxy measurements of C[subscript]phyto have been employed in the past, but are subject to many confounding influences that undermine their accuracy. Here we report the first directly measured C[subscript]phyto values from the...
Resource Type:: Article

Creator:: Kustka, Adam B., Kohut, Josh T., White, Angelicque E., Milligan, Allen J., Lam, Phoebe J., Dinniman, Michael S., Mack, Stefanie, Hunter, Elias, Hiscock, Michael R., Smith, Walker O., Jr., and Measures, Chris I.
Abstract:: See pdf for abstract.
Resource Type:: Article

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

Creator:: O'Malley, Robert T., Behrenfeld, Michael J., Westberry, Toby K., Milligan, Allen J., Reese, Douglas C., and Halsey, Kimberly H.
Abstract:: Submarine volcanic eruptions can result in both real and apparent changes in marine algal communities, e.g., increases in phytoplankton biomass and/or growth rates that can cover thousands of square kilometers. Satellite ocean color monitoring detects these changes as increases in chlorophyll and particulate backscattering. Detailed, high resolution analysis is needed...
Resource Type:: Article

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...
Resource Type:: Article

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