Please join us for a GSO Bio at Noon seminar featuring Dr. Pierre Marrec (URI).
Title: “Dynamics of phytoplankton community structure using automated flow cytometry: From single-cell analysis to fine-scale physical and biogeochemical variability.”
Abstract: Fine-scale (10s km, 1-10 days) physical dynamics strongly influence and regulate biogeochemical and ecological processes with a significant impact on phytoplankton community structure and primary production. These processes remain uncertain to describe due to their ephemeral nature and lack of in situ measurements at the needed resolution. Recent progress in automated flow-cytometry has enabled high resolution temporal and spatial measurements of the phytoplankton community structure, from micro-phytoplankton down to Prochlorococcus and Synechococcus picocyanobacteria. During my talk, I will present the main findings of a study, in which I used automated flow-cytometry together with advanced observing systems to characterize the physical, biological and biogeochemical dynamics of the western Mediterranean Sea. I will start by describing the links between the physical and biogeochemical properties of the study area and the phytoplankton community structure dynamics. Then I will show how single-cell optical properties obtained from automated flow cytometry can be used to estimate in-situ growth rates and apparent net primary production of picocyanobacteria. I will conclude with an overview of my role here at GSO in the Menden-Deuer’s lab by introducing the ongoing Northeast U.S. Shelf (NES) Long-Term Ecological Research (LTER) project, in which we investigate plankton community dynamics."
Wednesday, January 23 at 12:00pm to 1:00pm
Narragansett Bay Campus, Corless Auditorium (Watkins Building)
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