Short-period photophysiological responses of Thalassiosira pseudonana during photoacclimation to near-surface irradiance

Robert E. Reed; Gary J. Kirkpatrick; Dan Kamykowski

doi:10.1117/12.266494

6 February 1997 Short-period photophysiological responses of Thalassiosira pseudonana during photoacclimation to near-surface irradiance

Robert E. Reed, Gary J. Kirkpatrick, Dan Kamykowski

Author Affiliations +

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266494
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

A two-day deployment of the self-contained underwater photosynthetic apparatus (SUPS) was conducted to examine the effects of high and variable natural irradiance on the optical properties and primary productivity of the diatom Thalassiosira pseudonana. Study objectives included the determination of short time response in the cycling of diadinoxanthin (DD) and diatoxanthin (DT), and associated changes in the rates of primary production, and quantum yield, and in cell absorption characteristics over a tow day period. A nutrient replete, lowlight acclimated diatom culture was placed in SUPA and in a collocated culture reservoir fitted with a quartz top. The instrument was deployed in shallow water in Sarasota Bay under fluctuating, high irradiance typical for June. A pigment sampling series reveals a correlation of DD to DT cycling with exposure to high irradiance. Net quantum yields, determined by cell absorption spectra and minute-to-minute SUPA net primary productivity values, exhibit high values initially which decay to lower values upon exposure to high light. Short time scale changes in quantum yield are observed due to changes in DD/DT cycling and fluctuating irradiance.

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Robert E. Reed, Gary J. Kirkpatrick, and Dan Kamykowski "Short-period photophysiological responses of Thalassiosira pseudonana during photoacclimation to near-surface irradiance", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266494

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