TABLE 2.

Feeding rates of Spumella-like flagellates feeding on ultramicrobacteriaa

StrainParameterJBC07JBNZ41JBM10Ochromonas sp. strain DS
MWH-MoNR1Grazing mortality (d−1)0.16 ± 0.010.18 ± 0.020.11 ± 0.010.08 ± 0.01
Clearance (nl ind−1 h−1)1.6 ± 0.42.7 ± 0.41.7 ± 0.21.7 ± 0.2
Ingestion (bact ind−1 h−1)5.9 ± 1.510.4 ± 1.56.7 ± 0.77.1 ± 0.7
Community grazing (cells ml−1 h−1)2.4 ± 0.2 × 1042.8 ± 0.3 × 1041.7 ± 0.2 × 1041.3 ± 0.2 × 104
Growth (d−1)0.28 ± 0.030.41 ± 0.10NDND
MWH-TaW3Grazing mortality (d−1)0.33 ± 0.030.38 ± 0.080.10 ± 0.010.08 ± 0.02
Clearance (nl ind−1 h−1)2.6 ± 0.36.6 ± 2.02.2 ± 0.41.7 ± 0.4
Ingestion (bact ind−1 h−1)9.2 ± 1.024.3 ± 7.88.5 ± 1.66.6 ± 1.6
Community grazing (cells ml−1 h−1)4.8 ± 0.4 × 1045.7 ± 1.4 × 1041.5 ± 0.2 × 1041.2 ± 0.3 × 104
Growth (d−1)0.12 ± 0.030.47 ± 0.12NDND
MWH-VicM1Grazing mortality (d−1)0.10 ± 0.030.16 ± 0.040.11 ± 0.010.07 ± 0.03
Clearance (nl ind−1 h−1)0.9 ± 0.43.1 ± 0.93.2 ± 0.71.7 ± 1.1
Ingestion (bact ind−1 h−1)4.1 ± 2.013.5 ± 4.613.9 ± 3.37.4 ± 4.9
Community grazing (cells ml−1 h−1)1.9 ± 0.5 × 1042.8 ± 0.8 × 1042.0 ± 0.2 × 1041.3 ± 0.5 × 104
Growth (d−1)0.06 ± 0.070.31 ± 0.11NDND
MWH-MoIso2Grazing mortality (d−1)0.17 ± 0.010.25 ± 0.040.07 ± 0.040.06 ± 0.04
Clearance (nl ind−1 h−1)1.9 ± 0.24.5 ± 0.41.2 ± 0.51.4 ± 0.8
Ingestion (bact ind−1 h−1)9.9 ± 0.922.5 ± 2.06.7 ± 3.07.7 ± 4.6
Community grazing (cells ml−1 h−1)3.6 ± 0.1 × 1045.0 ± 0.8 × 1041.6 ± 0.8 × 1041.3 ± 0.8 × 104
B. diminutaGrazing mortality (d−1)0.67 ± 0.090.26 ± 0.040.11 ± 0.030.16 ± 0.04
Clearance (nl ind−1 h−1)7.0 ± 0.76.2 ± 1.61.9 ± 0.23.3 ± 1.8
Ingestion (bact ind−1 h−1)25.6 ± 2.423.9 ± 6.17.9 ± 1.014.3 ± 5.3
Community grazing (cells ml−1 h−1)7.7 ± 3.1 × 1044.1 ± 6.0 × 1041.8 ± 0.5 × 1042.8 ± 0.7
Growth (d−1)0.81 ± 0.11NDNDND
L. pelagiaGrowth (d−1)0.51 ± 0.040.47 ± 0.17NDND
  • a Grazing mortality, clearance, ingestion, and community grazing rates were calculated from the short-term experiment, and the growth rate was calculated from the long-term experiment. Please note that the calculation of the ingestion rate strongly depends on the actual food concentration; clearance and grazing are therefore more robust measures at the realized food concentrations. Ingestion rates were, however, exemplarily calculated for the realized food concentration after 6 h in the short-term experiment, 2.9 × 106 to 5.4 × 106 bacteria ml−1. ind, individual; bact, bacteria; ND, not determined.