SS4.07 Lipids/Fatty Acids in Ecological Research
Date: Tuesday, June 11, 2002
Time: 2:30:00 PM
Location: Saanich
 
HazzardSE, University at Albany SUNY, Albany, USA, sehazzard@hotmail.com
Kleppel, G, S, University at Albany SUNY, Albany, USA, gkleppel@csc.albany.edu
 
OMEGA-3 FATTY ACIDS AND ZOOPLANKTON EGG PRODUCTION IN FLORIDA BAY
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Effects of seston fatty acid and organic macronutrient concentrations on carbon flow in planktonic food webs were investigated in Florida Bay between 1998 and 1999. Seston samples were collected during non-bloom conditions near Rankin Key, during a diatom-dominated bloom near Flamingo, and during a flagellate-dominated bloom near Rabbit Key. Egg production rates (EP) of the biomass-dominant calanoid copepod Acartia tonsa were measured at these locations, and concentrations of fatty acids and macronutrients (lipids, carbohydrates, and proteins) were simultaneously measured in the seston. EP was significantly lower off Rankin Key (2.7-2.8 eggs/female/day) than at the bloom sites, where EP was more typical for the species (25.0-56.3 eggs/female/day). Organic macronutrient and fatty acid concentrations were low off Rankin Key and Flamingo, and significantly higher off Rabbit Key. Polyunsaturated fatty acids, including 18:3, 20:5, and 22:6, each important omega-3 fatty acids, were present at all locations. EP varied independently of all macronutrient and most fatty acid concentrations. EP was correlated with 18:3, suggesting a possible biochemical link between the omega-3 fatty acids.