1.3 Zooplankton Grazing on Marine Snow……………………………… 6 1.4 Objectives and Hypotheses……………………………………………7 References…………………………………………………………………8 CHAPTER 2: Effects of phytoplankton properties on the ingestion of marine snow by Calanus pacificus………………………………………………………13 2.1 Introduction…………………………………………………………..13 2.2 Methods………………………………………………………………17 2.2.1 Copepod collection………………………………………...18 2.2.2 Phytoplankton cultures and aggregate formation………….18 2.2.3 Grazing experiments……………………………………….20 2.2.4 Gut pigment analysis……………………………………….22 2.2.5 Stable isotope analysis……………………………………..23 2.2.6 Data analysis……………………………………………….25 2.3 Results………………………………………………………………..25 2.4 Discussion……………………………………………………………29 ix 2.4.1 Comparison of gut pigment and stable isotope analysis for measuring ingestion of aggregates……………………………….30 2.4.2 Factors affecting ingestion of aggregates by copepods……32 2.4.3 Significance to plankton ecology…………………………..35 Tables and Figures……………………………………………………….50 References………………………………………………………………..63 CHAPTER 3: Conclusion………………………………………………………..