Goericke, R. Scripps Institution of Oceanography, rgoericke@ucsd.edu
Strom, S. Shannon Point Marine Ctr., stroms@cc.wwu.edu

 
NEW CHL A-DERIVED BIOMARKERS IN THE MARINE ENVIRONMENT: POTENTIAL APPLICATIONS AND IMPLICATIONS FOR MEASUREMENTS OF GRAZING
 
Recently three new classes of chlorophyll a degradation products have been discovered in marine sediments, sterol chlorin esters, carotenol chlorin esters and cyclic pheophorbides (CPPs), e.g. 13(2),17(3)-cyclopheophorbide a. Compounds of these classes are potentially powerful biomarkers and their properties have implications for routine measurements of phytoplankton biomass and grazing. We will describe these compounds, outline simple analytical procedures for their analysis and discuss the distribution of these compounds in fecal matter, sediment trap samples and marine sediments. Preliminary evidence suggests that carotenol chlorin esters are tracers of new production derived from diatoms. CPPs derived from divinyl-chlorophyll a and b are tracers for Prochlorophytes, applications of these are discussed for the tropical ocean.
 
Day: Friday, Feb. 5
Time: 08:30 - 08:45am
Location: Sweeney Center
 
Code: CS63FR0830S