TABLE 2.

Overview of the performed experimentsa

Type of expt (no. of expts)OrganismsMeasured parameter(s)Method
Long-term predation expt (5) Hylemonella sp. strain WQH1Flagellate abundance, bacterial abundance, bacterial cell sizeEpifluorescence microscopy
H. gracilis strain WQT2
H. gracilis strain WQM2
H. gracilis strain WQP1
S. aurantia strain WQM4
P. putida MM1b
Short-term predation exptc (5) H. gracilis WQT2 + P. putida MM1 (lower concn)Bacterial abundanceEpifluorescence microscopy
S. aurantia WQM4 + P. putida MM1 (lower concn)
H. gracilis WQT2 + P. putida MM1 (higher concn)
S. aurantia WQT2 (higher concn)
P. putida MM1 (higher concn)
Video microscopy exptc (5) H. gracilis WQT2 + P. putida MM1 (lower concn)Contact rate, capture rate, ingestion rateVideo microscopy
S. aurantia WQM4 + P. putida MM1 (lower concn)
H. gracilis WQT2 + P. putida MM1 (higher concn)
S. aurantia WQT2 (higher concn)
P. putida MM1 (higher concn)
  • a Ochromonas sp. DS was used as model predator for all the experiments. The short-term predation experiments and the video microscopy experiments were performed in parallel and used organisms from the same precultures.

  • b Stationary stage, starved and heat killed. It was used as positive control.

  • c P. putida MM1 was at stationary stage, not heat killed.