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

 
CONTRIBUTIONS FROM THE COPEPOD COMMUNITY TO PHYTOPLANKTON MORTALITY AND VERTICAL FLUX OF CARBON AND SILICA NEAR THE ANTARCTIC POLAR FRONT.
 
During Spring (Dec 1997) and late Summer (Feb-Mar 1998), copepod abundance, feeding and fecal pellet production were measured during transects across the Southern Ocean Polar Front. Data are synthesized to determine the proportion of daily phytoplankton production consumed by the copepod community, and the potential contribution of fecal material from the copepod community to vertical flux of C and Si. At the Front, copepods comprised 85% of the mesozooplankton during Spring but only 51 % during late Summer. South of the Front, copepods comprised >85 % of the mesozooplankton during both cruises. Dominant species at the Front were Rhincalanus gigas, Calanus simillimus and Metridia spp. South of the Front, Calanus propinquus, Calanoides acutus and Metridia longa dominated. The copepod community consumed 3-5 % of the phytoplankton standing stock daily, equivalent to 16 - 25 % of phytoplankton growth during Spring and 10 - 16 % of phytoplankton growth during late Summer. Fecal pellet production ranged from 7 - 50 pellets/copepod/day. The C and Si contents of representative pellets are currently being measured. The amounts of C and Si produced daily by the copepod community, in the form of rapidly sinking fecal pellets, will be determined.
 
Day: Friday, Feb. 5
Time: 03:30 - 03:45pm
Location: Sweeney Center
 
Code: SS31FR0330S