CS29 Phytoplankton & Primary Production
Date: Monday, June 10, 2002
Time: 11:15:00 AM
Location: Oak Bay
 
AndersonJT, Skidaway Institute of Oceanography, Savannah, USA, anderson@skio.peachnet.edu
Verity, P, G, Skidaway Institute of Oceanography, Savannah, USA, peter@skio.peachnet.edu
Kohlberg, K, , Skidaway Institute of Oceanography, Savannah, USA, kohlberg@skio.peachnet.edu
 
APPLICATION OF FLUORESCENT STAINS TO DETERMINE TROPHIC ROLE OF PHAEOCYSTIS POUCHETII (PRYMNESIOPHYCEAE)
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We examine the trophic role of Phaeocystis pouchetii both as a prey source to microzooplankton and as a predator of free-living bacteria throughout the course of a Phaeocystis bloom in mesocosm taks. To examine the role of Phaeocystis as prey, a Phaeocystis pouchetii culture of solitary cells was stained with DTAF and added to the <200Ám fraction samples of microzooplankton obtained in the mesocosms. By enumerating the number of fluorescent Phaeocystis cells ingested by specific types of microzooplankton, we were able to quantify the relative importance of those types of microzooplankton to the total community ingestion rates on Phaeocystis. To examine the role of Phaeocystis as a potential predator, bacterial assemblages were also stained with DTAF and added to mesocosm samples. The results and ecological ramifications are discussed.