Tang, K. W. University of Connecticut, kwt94001@uconnvm.uconn.edu
Dam, H. W. University of Connecticut, hgdam@uconnvm.uconn.edu
Visscher, P. T. University of Connecticut, visscher@uconnvm.uconn.edu
Fenn, T. D. University of Connecticut, tdf94001@uconnvm.uconn.edu

 
DMSP IN MARINE COPEPODS AND ITS RELATION WITH DIETS AND SALINITY
 
Five species of calanoid copepods from Long Island Sound contained DMSP not associated with gut contents. DMSP content varied interspecifically from 0.01 to 1.03 nmol/ind. Carbon-specific DMSP content of the copepods was comparable to that of diatoms, chlorophytes and crytophytes. In laboratory experiments, Temora longicornis contained more DMSP when fed DMSP-rich Tetraselmis impellucida, compared with DMSP-poor Dunaliella tertiolecta. The DMSP content of T. longicornis after gut clearance is curvilinearly correlated to the ingestion rate. Within the same diet, T. longicornis contained more DMSP at higher salinity, indicating an osmoregulatory function of DMSP. The DMSP content of T. longicornis decreased faster in response to a decrease in salinity than it increased with an increase in salinity, implicating separate mechanisms for accumulation and removal of DMSP in the copepod. We argue that copepod biomass represents an often neglected source of particulate DMSP in the water column and that the copepod DMSP pool is closely related to phytoplankton, yet regulated by different ecological processes.
 
Day: Friday, Feb. 5
Time: 11:00 - 11:15am
Location: Sweeney Center
 
Code: SS37FR1100S