The capture success of A. maculatus did not differ significantly between day- and
night-phase trials conducted with L. polyedrum at concentrations of 5, 10, and 20
cells ml−1 (paired two-sample t-test for means). Capture success was significantly
higher in the presence of night-phase L. polyedrum at concentrations of 40 cells ml−1
(two-sample t-test assuming equal variances: P = 0.001) and 500 cells ml−1 (P < 0.05)
in comparison to day-phase L. polyedrum. Capture success increased to approximately
87% at a concentration of 500 cells ml−1 (night-phase), compared to approximately
62% at all other concentrations of night-phase L .polyedrum (Fig. 3B). There
was also no significant difference in capture success between trials conducted with
day-phase L. polyedrum and trials that did not contain cells (single-factor ANOVA:
F(4,25) = 0.40, P = 0.80) (Fig. 3B). Additionally, in the two trials conducted with the media
from L. polyedrum cultures, the results of both prey consumption (two to three
shrimp) and capture success (about 33%) were comparable to trials conducted with
day-phase cells and no cells (data not shown).