01. March 2018 | colloquium

Dr. Meri Eichner

Microsensor Group, Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen
1. Mar
01st March 2018, 2.00 pm
colloquium

Dr. Meri Eichner

Lecture hall, Müggelseedamm 310, 12587 Berlin

Microenvironments and single-cell variability inTrichodesmium colonies

N2-fixation by the colony-forming cyanobacteriumTrichodesmium is an important source of new nitrogen in the subtropical and tropical oligotrophic oceans. For understanding the ecology and physiology of this keystone species in a changing climate, we need to consider the implications of colony formation for chemical microenvironments and biotic interactions. The seminar will focus on a field study targeting gradients of O2 and pH as well as single-cell fluxes of carbon and nitrogen inTrichodesmium colonies under different pCO2 levels. Microsensor measurements and single-cell analysis by nanoSIMS indicated that cells within colonies experienced large fluctuations in O2, pH and CO2 concentrations, and showed high variability in carbon and nitrogen assimilation on a single-cell level. I will discuss the implications of our findings for responses of colony-forming phytoplankton to both short- and long-term variability in their environment.

 

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Host: Hans-Peter Grossart

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