SS3.04 Biogeochemistry of DOC/DON in a Watershed Context
Date: Wednesday, June 12, 2002
Time: 12:00:00 PM
Location: Carson B
 
PilonVL, The Virginia Institute of Marine Science, Gloucester Point, USA, vpilon@vims.edu
Canuel, E, A, The Virginia Institute of Marine Science, Gloucester Point, USA, ecanuel@vims.edu
Ederington-Hagy, M, , The Virginia Institute of Marine Science, Gloucester Point, USA, mehagy@toadmail.com
 
FLOW DYNAMICS AND THEIR EFFECT ON PARTICULATE ORGANIC MATTER COMPOSITION IN THE SACRAMENTO AND SAN JOAQUIN RIVERS, CA
image
The Sacramento and San Joaquin Rivers are the major sources of freshwater and suspended solids to San Francisco Bay and are also important contributors of particulate organic matter (POM) to the Bay's associated Delta. However, there is limited information on the specific sources and quality of POM within these rivers, and how seasonal and interannual variations in flow influence POM composition. Lipid biomarker compounds (sterols and fatty acids) and bulk biochemical analyses (total proteins, carbohydrates, and lipids) were used to characterize POM composition for nine cruises between October 1998 to July 2000. Results indicate that each river delivers POM of different quality to the Delta and northern Bay, with the San Joaquin River delivering POM with higher concentrations of labile compounds (polyunsaturated fatty acids, total proteins), particularly during summer months. Biomarker compositions indicate that algal production within the rivers may be imported to the Delta during the initial high flow period while subsequent high flow events are characterized by more refractory materials.