Copepod responses to strain CCMP 1850 in exponential growth phase
Grazing experiment
No significant differences in ingestion rates occurred in experiment 4 (Fig. 5a–c). Unlike the results using strain 1708, no grazing was detected in bottles when A. anophagefferens clone 1850 was the only food source (Fig. 5b). Jacobs electivity indices (absolute value) for nauplii fed diets of 20:80 and 80:20 Aa:ISO in this experiment were four times greater than for the 50:50 Aa:ISO diet (experiment 4, Table II). A positive electivity index for I. galbana was measured in all mixed diets (Table II; see also Fig. 5b and c).