TABLE 1.
Initial and final concentrations of dissolved inorganic phosphate (DIP) and nitrogen (DIN; sum of nitrate/nitrite + ammonium). The dissolved organic carbon (DOC) concentration at incubation day 0 (DOC0) and the minimum concentration (DOCMin) are also shown together with the bioavailable fraction (BDOC). Initial (BP0) and final (BP4) bacterial production (BP), and the 4 days integrated BP values (BPInt) are shown. The initial (BA0, BB0) and maximum (BAMax, BBMax) cell abundance (BA) and biomass (BB) are shown as well as the 4 days integrated growth in bacterial biomass (BG). The 4 days integrated enzymatic activities for alkaline phosphatase (APaseInt), β-glucosidase (BGaseInt) and leucine aminopeptidase (LAPaseInt) are also shown. Values are averages of the three replicate bottles ± standard deviation.
|
Control |
Glucose |
Seagrass |
Mangrove |
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| Temperature (°C) | −3°C | In situ | +3°C | −3°C | In situ | +3°C | −3°C | In situ | +3°C | −3°C | In situ | +3°C |
| DIP0 (μmol P L–1) | 0.08 ± 0.02 | 0.07 ± 0.02 | 0.03 ± 0.02 | 0.87 ± 0.01 | ||||||||
| DIN0 (μmol N L–1) | 0.26 ± 0.06 | 0.26 ± 0.03 | 0.24 ± 0.02 | 0.36 ± 0.02 | ||||||||
| DOC0 (μmol C L–1) | 83 ± 1 | 128 ± 2 | 128 ± 1 | 126 ± 1 | ||||||||
| DOCMin (μmol C L–1) | 72 ± 1∗∗ | 69 ± 1∗∗ | 68 ± 2∗∗ | 118 ± 1∗ | 112 ± 4∗ | 105 ± 1∗ | 123 ± 1∗ | 121 ± 1∗ | 116 ± 1∗ | 102 ± 1∗∗ | 97 ± 1∗∗ | 92 ± 1∗∗ |
| BDOC (μmol C L–1) | 11 ± 1 | 14 ± 2 | 15 ± 2 | 9 ± 3 | 16 ± 6 | 23 ± 3 | 4 ± 1 | 8 ± 1 | 12 ± 2 | 24 ± 1 | 28 ± 1 | 33 ± 1 |
| BP0 (μmol C L–1 d–1) | 0.04 ± 0.01 | 0.05 ± 0.01 | 0.06 ± 0.01 | 0.02 ± 0.01 | 0.03 ± 0.01 | 0.05 ± 0.01 | 0.02 ± 0.01 | 0.03 ± 0.01 | 0.03 ± 0.01 | 0.01 ± 0.01 | 0.01 ± 0.01 | 0.01 ± 0.01 |
| BP4 (μmol C L–1 d–1) | 0.09 ± 0.01 | 0.12 ± 0.02 | 0.07 ± 0.01 | 0.09 ± 0.03 | 0.09 ± 0.01 | 0.11 ± 0.03 | 0.11 ± 0.01 | 0.12 ± 0.01 | 0.14 ± 0.01 | 1.78 ± 0.06 | 2.59 ± 0.18 | 4.08 ± 0.21 |
| BPInt (μmol C L–1) | 0.42 ± 0.04 | 0.49 ± 0.04 | 0.50 ± 0.06 | 0.37 ± 0.04 | 0.41 ± 0.03 | 0.51 ± 0.06 | 0.38 ± 0.02 | 0.53 ± 0.03 | 0.57 ± 0.04 | 3.41 ± 0.20 | 5.08 ± 0.31 | 8.42 ± 0.93 |
| BB0 (μmol C L–1) | 0.09 ± 0.01 | 0.08 ± 0.01 | 0.10 ± 0.01 | 0.09 ± 0.01 | ||||||||
| BBMax (μmol C L–1) | 0.36 ± 0.02∗ | 0.36 ± 0.02∗ | 0.36 ± 0.01∗ | 0.30 ± 0.03∗ | 0.37 ± 0.01∗ | 0.44 ± 0.03∗ | 0.58 ± 0.12∗∗ | 0.64 ± 0.11∗ | 0.63 ± 0.04∗ | 10.25 ± 1.08∗ | 9.42 ± 0.71∗ | 9.05 ± 0.92∗ |
| BG (μmol C L–1) | 0.27 ± 0.02 | 0.27 ± 0.03 | 0.27 ± 0.02 | 0.21 ± 0.04 | 0.28 ± 0.01 | 0.35 ± 0.04 | 0.48 ± 0.13 | 0.54 ± 0.12 | 0.53 ± 0.05 | 10.16 ± 1.09 | 9.33 ± 0.72 | 8.96 ± 0.93 |
| APaseInt (nmol L–1) | 12 ± 1 | 20 ± 1 | 30 ± 3 | 12 ± 1 | 24 ± 1 | 31 ± 2 | 14 ± 2 | 26 ± 3 | 30 ± 3 | 273 ± 22 | 341 ± 25 | 522 ± 40 |
| BGaseInt (nmol L–1) | 0.6 ± 0.3 | 1.2 ± 0.2 | 2.7 ± 0.5 | 2.0 ± 0.6 | 2.5 ± 0.6 | 3.4 ± 0.6 | 5.5 ± 1.7 | 6.8 ± 1.3 | 8.7 ± 1.9 | 102 ± 16 | 149 ± 7 | 185 ± 12 |
| LAPaseInt (nmol L–1) | 43 ± 3 | 41 ± 4 | 53 ± 5 | 66 ± 4 | 83 ± 8 | 88 ± 9 | 113 ± 21 | 201 ± 26 | 362 ± 23 | 241 ± 43 | 394 ± 31 | 1308 ± 130 |
∗Value was obtained on day 3; ∗∗Value was obtained on day 4.