Peterson, J. O. LUMCON, JPeterson@lumcon.edu
Urban-Rich, J. L. LUMCON, jurban@lumcon.edu
Dagg, M. J. LUMCON, mdagg@lumcon.edu

 
CONTRIBUTION OF COPEPOD GRAZING TO BIOGENIC SILICA FLUX IN THE SOUTHERN OCEAN POLAR FRONTAL REGION.
 
An investigation into the impact of the dominant mesozooplankton grazers on biogenic silica (BSi) flux took place during the U.S. JGOFS AESOPS cruises in the austral Spring (Dec 1997) and late Summer (Feb-Mar 1998). Fecal pellets were collected from shipboard incubations of the dominant copepods, including Rhincalanus gigas, Calanus simillimus, Metridia spp., Calanus propinquus and Calanoides acutus. We observed both intra-annual and latitudinal variation in the amount of BSi available as copepod food in the upper 200m of the water column. The potential impact of the dominant copepod grazers on this standing stock will be presented. Initial results indicate that fecal pellet production ranges from 7-50 pellets/copepod/day with silica values of 140-800 ng BSi/pellet.
 
Day: Wednesday, Feb. 3
Time:
Location: Sweeney Center
 
Code: SS31WE0501S