St. John, M. A. Danish Institute for Fisheries Research, msj@dfu.min.dk
Jonasdottir, S. A. Danish Institute for Fisheries Research, sjo@dfu.min.dk

 
LIPID BIOMARKERS: RESOLVING THE IMPORTANCE OF DIATOM PRODUCTION FOR REPRODUCTIVE POTENTIAL OF CALANUS FINMARCHICUS
 
Understanding mechanisms causing fluctuations in the population dynamics of animals requires an understanding of the processes affecting recruitment success. These may be both environmental and related to the composition, abundance and distribution of the population itself. For populations of planktonic marine organisms in temperate and high latitude seas, the annual spring diatom bloom is critical for recruitment. Here, we use data on conservatively transferred phytoplankton lipids as tracers to show the importance of the spring diatom bloom for condition of overwintering and reproductively active C. finmarchicus. Results presented are from research cruises during the winter of 1995 in the Faroe Shetland Channel. Diapause and adult C. finmarchicus having a lipid composition indicative of utilization of a diatom based food web had higher levels of energetic reserves(wax esters) relative to individuals from a flagellate based food web. Lipid biomarkers also identified a switch in feeding mode in C. finmarchicus from herbivory in periods of diatom abundance to a more omnivorous strategy during flagellate dominated periods.
 
Day: Thursday, Feb. 4
Time: 02:15 - 02:30pm
Location: Sweeney Center
 
Code: SS36TH0215S