Table 3.

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

SeasonStationSlice (cm)KineticsDepth (m)Bacterial concn (108cells ml−1)Vm (μM h−1)Km (μM)Vm/Km(h−1)cfrndfSsys (10−2)
WinterK10-2Global3510.1455.1 (22)a 445.1 (17)1.020.956281
Low112.4 (12)39.8 (28)2.820.95285.2
High487.6 (6)542.3 (11)0.900.962158
2-4b Globalc 11.28.2 × 103 (2 × 104)145.0 × 103 (2 × 103)0.061660.8
Lowc 24.0 (44)166.6 (63)0.140.99214.7
Highc 1.3 × 1011 (9 × 107)2.3 × 1012 (9 × 107)0.061262.9
4-6b Globalc 9.843.5 (18)2,017.3 (24)0.020.9969.5
Lowc 7.9 × 107 (6 × 108)3.56 × 109 (6 × 108)0.02125.4
Highc 44.6 (31)2,092.7 (42)0.020.99215.3
K20-2Global8619.4432.2 (5)278.0 (12)1.550.926234
Low122.3 (7)38.3 (16)3.200.95255.2
High427.2 (4)266.7 (10)1.600.942169
2-4b Global10.662.2 (49)1,145.2 (76)0.050.98685.9
Low4.5 (12)6.3 (65)0.720.82213.1
Highc 64.9 (85)1,231.9 (131)0.050.992132
4-6b Global8.418.1 (9)298.1 (21)0.060.92618.5
Lowc 16.7 (54)269.7 (69)0.060.9926.1
High18.1 (18)298.0 (46)0.060.94231.5
K30-2Global80011.2164.9 (8)154.8 (25)1.070.876246
Low82.7 (1)37.3 (3)2.220.9428.6
High179.5 (15)214.5 (45)0.840.932321
2-4Global9.3207.8 (29)628.9 (53)0.330.966334
Low142.7 (43)195.6 (58)0.730.99259.3
High309.2 (45)1,294.6 (69)0.240.982301
4-6b Global8.6143.2 (6)109.0 (21)1.310.815189
Lowc 481.1 (363)561.6 (411)0.860.992228
High134.4 (0.1)70.2 (0.6)1.910.8612.4
K40-2Global9203.556.0 (11)139.0 (34)0.400.8622225
Low23.2 (10)8.4 (42)2.760.831085.0
High80.0 (19)426.9 (42)0.190.9510213
2-4Global4.8216.0 (13)386.5 (29)0.560.9422478
Low52.5 (12)16.1 (40)3.260.8810160
High258.3 (21)590.5 (42)0.440.9610557
4-6Global6.992.6 (9)161.3 (28)0.570.8822286
Low45.2 (7)22.9 (40)1.970.911065.1
High133.2 (15)477.0 (42)0.280.9610255
SummerK50-2b Global359.1202.4 (10)602.9 (18)0.340.96665.2
Low80.8 (16)148.0 (27)0.550.98218.2
High219.4 (17)715.3 (31)0.310.97285.1
2-4b Global10.077.0 (30)727.6 (51)0.110.97660.3
Lowc 3.1 × 1023 (6 × 108)4.3 × 1024 (6 × 108)0.071210.6
High68.4 (46)561.0 (93)0.120.96298.8
4-6Global14.032.8 (12)593.0 (22)0.060.96626.3
Low10.6 (14)85.5 (30)0.120.9728.9
High37.8 (12)798.8 (21)0.050.98218.6
K60-2b Global8611.1233.2 (11)367.2 (23)0.640.936250
Low84.2 (4)52.4 (9)1.610.95226.4
High260.9 (14)487.4 (30)0.540.962245
2-4b Global8.027.6 (4)404.7 (8)0.070.9469.9
Lowc 138.4 (452)2,477.9 (474)0.060.99214.6
High27.7 (0.7)407.6 (2)0.070.9521.5
4-6b Global10.515.2 (13)244.7 (31)0.060.91627.5
Lowc 2.2 × 1016 (1 × 108)5.9 × 1017 (1 × 108)0.04123.4
High13.6 (21)160.3 (73)0.090.92239.3
K70-2Global10.7104.3 (14)310.2 (32)0.340.926172
Low45.1 (12)46.0 (33)0.980.94255.3
High133.4 (6)578.7 (13)0.230.96249.0
2-4b Global10.332.5 (10)663.8 (18)0.050.96619.3
Low11.5 (34)130.3 (61)0.090.98214.0
high36.4 (9)833.6 (16)0.040.98213.1
4-6b Global7.120.2 (14)534.8 (26)0.040.95620.4
Low14.2 (29)292.0 (40)0.050.9524.5
High22.7 (28)689.5 (52)0.030.97231.1
K80-2Global80010.9139.0 (11)110.9 (36)1.250.866344
Low75.6 (4)15.5 (19)4.870.86261.0
High174.2 (7)259.4 (18)0.670.932125
2-4Global9.5166.7 (11)180.0 (30)0.930.896310
Low76.1 (9)21.9 (32)3.470.882103
High197.4 (4)313.3 (10)0.630.94276.1
4-6Global7.4151.7 (14)170.6 (38)0.890.896358
Low77.4 (6)26.9 (20)2.880.90263.7
High195.0 (18)375.6 (42)0.520.952294
K90-2Global92012.638.9 (27)172.3 (73)0.230.896345
Low16.5 (4)4.1 (48)4.030.82235.1
High79.0 (56)948.0 (94)0.080.982275
2-4Global8.931.5 (21)120.8 (64)0.260.866176
Low17.2 (15)10.7 (87)1.610.85269.2
High49.6 (27)498.1 (57)0.100.962112
4-6b Global8.8609.0 (14)322.4 (31)1.890.9361,046
Lowc 1.5 × 109 (2 × 108)1.3 × 109 (2 × 108)1.1412129
High565.2 (19)254.3 (51)2.220.9221,492
  • 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.