Picophytoplankton photoacclimation and mixing in the surface oceans
Dusenberry, Jeffrey A.
MetadataShow full item record
KeywordPhytoplankton; Photosynthesis; Primary productivity; Acclimatization; Oceanic mixing; Oceanus (Ship : 1975-) Cruise OC214; Endeavor (Ship: 1976-) Cruise EN232
Fluctuations in light intensity due to vertical mixing in the open ocean surface layer will affect phytoplankton physiology. Conversely, indicators of phytoplankton photoacclimation will be diagnostic of mixing processes if the appropriate kinetics are known. A combination of laboratory and field experimental work, field observations, and theoretical models were used to quantify the relationship between vertical mixing and photoacclimation in determining the time and space evolution of single cell optical properties for the photosynthetic picoplankton, Prochlorococcus spp. Diel time-series observations from the Sargasso Sea reveal patterns in single-cell fluorescence distributions within Prochlorococcus spp. populations which appear to correspond to decreasing mixing rates and photoacclimation during the day, and increased mixing at night. Reciprocal light shift experiments were used to quantify the photoacclimation kinetics for Prochlorococcus spp. fluorescence. A laboratory continuous culture system was developed which could simulate the effects of mixing across a light gradient at the level of the individual cell. This system was operated at four different simulated diffusivities. Prochlorococcus marinus strain Med4 fluorescence distributions show distinct patterns in the mean and higher moments which are consistent with a simple quasi-steady turbulent diffusionphotoacclimation model. In both, daytime photoacclimation drove the development of a gradient in mean fluorescence, a decrease in variance overall, and skewing of distributions away from the boundaries. These results suggest that picophytoplankton single-cell fluorescence distributions could prove to be a useful diagnostic indicator of the mixing environment.
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 1995
Suggested CitationThesis: Dusenberry, Jeffrey A., "Picophytoplankton photoacclimation and mixing in the surface oceans", 1995-02, DOI:10.1575/1912/5615, https://hdl.handle.net/1912/5615
Showing items related by title, author, creator and subject.
Stratus Ocean Reference Station (20˚S, 85˚W), mooring recovery and deployment cruise R/V Revelle cruise dana 03, November 10 - November 26, 2003 Hutto, Lara; Weller, Robert A.; Lord, Jeffrey; Smith, Jason C.; Ryder, James R.; Galbraith, Nancy R.; Fairall, Christopher W.; Stalin, Scott; Andueza, Juan Carlos; Tomlinson, Jason (Woods Hole Oceanographic Institution, 2004-03)The Ocean Reference Station at 20°S, 85°W under the stratus clouds west of northern Chile and Peru is being maintained to provide ongoing, climate-quality records of surface meteorology, of air-sea fluxes of heat, ...
Stratus Ocean Reference Station (20˚S, 85˚W) : mooring recovery and deployment cruise, R/V Ronald H. Brown Cruise 06-07, October 9–October 27, 2006 Bigorre, Sebastien P.; Weller, Robert A.; Lord, Jeffrey; Whelan, Sean P.; Galbraith, Nancy R.; Wolfe, Dan; Bariteau, Ludovic; Ghate, Virendra P.; Zajaczkovski, Uriel; Vera, Alvaro; Maenner, Stacy; Hoyt, Brett (Woods Hole Oceanographic Institution, 2007-02)The Ocean Reference Station at 20°S, 85°W under the stratus clouds west of northern Chile is being maintained to provide ongoing, climate-quality records of surface meteorology, of air-sea fluxes of heat, freshwater, and ...
U.S. program in biology, International Indian Ocean Expedition final cruise report, Anton Bruun cruise 1 International Indian Ocean Expedition (Woods Hole Oceanographic Institution, 1964-07)The following report, in two volumes, presents the reduced oceanographic, chemical,and biological data, bathythermograph positions, and station lists for biological collections taken during Cruise 1 of the ANTON BRUUN in ...