Table 2.

Microbiological and statistical parameters for NBW samples collected in the winter and the summer at four sampling stations in the northwestern Mediterranean Sea

SeasonStationKineticsDepth (m)Bacterial concn (104 cells ml−1)Vm (10−3μM h−1)Km(μM)Vm/Km (10−3h−1)cfrndfSsys(10−2)
WinterK1Global3513.58.2 (5)a26.5 (21)0.310.69192.89
Low6.0 (6)9.9 (24)0.600.84101.57
High9.4 (9)75.2 (53)0.130.8972.90
K2bGlobal865.38.0 (7)14.1 (35)0.570.65262.52
Low6.7 (11)7.5 (51)0.900.82141.95
Highc8.9 (16)45.4 (143)0.200.88103.14
K3Global8000.52.8 (4)8.1 (26)0.350.63191.11
Low2.5 (6)4.8 (35)0.530.81100.80
High3.7 (7)115.0 (33)0.0320.9170.80
K4Global9202.66.1 (7)7.9 (35)0.770.75201.39
Low5.3 (5)4.1 (26)1.280.88100.48
High8.4 (12)74.8 (43)0.110.8381.49
SummerK5Global3547.322.8 (5)35.5 (20)0.640.79263.46
Low16.6 (9)15.6 (28)1.070.97142.62
High26.2 (17)75.0 (79)0.350.97103.63
K6Global8616.530.3 (4)30.6 (18)0.990.77264.33
Low21.8 (6)11.8 (23)1.850.85142.84
High38.1 (14)99.8 (53)0.380.98103.84
K7Global8623.222.7 (4)34.1 (18)0.670.78263.14
Low17.2 (7)16.1 (22)1.070.87142.10
High31.4 (17)149.4 (49)0.210.98102.98
K8bGlobal8002.213.2 (5)7.3 (32)1.820.65263.04
Low12.7 (9)6.3 (46)2.030.82142.99
Highc13.5 (20)9.5 (590)1.430.96103.36
K9Global9200.716.6 (4)5.9 (27)2.830.64265.74
Low20.5 (4)11.7 (15)1.760.85143.43
High15.1 (7)AVdAV0.88104.70
  • a The values in parentheses are standard errors, expressed as percentages.

  • b Biphasic extracellular proteolytic activity was not revealed by the F test at P < 0.1.

  • c Kinetic parameters were not determined.

  • d AV, aberrant value.