Methodology:  Sediment trap material was filtered onto 90 mm glass fiber
 filters (A/E) and frozen.  Filters with trap material and sediments were
 Soxhlet extracted with methylene chloride-methanol (2:1) and the extracts
 partitioned into the organic phase with 5% NaCl.  The "lipid extracts"
 were saponified with 0.5N KOH/methanol, with "neutral lipids" extracted
 out of basic solution and "acids" extracted out of acidic solution.
 Neutral lipids were silylated with BSTFA and fatty acids were methylated
 with diazomethane.  Anaylsis was by gas chromatography and gas
 chromatography-mass spectrometry.