Primary food source | Upper estuarine zone | Middle estuarine zone | Lower estuarine zone | |||
---|---|---|---|---|---|---|
δ13C | δ15N | δ13C | δ15N | δ13C | δ15N | |
Sediment POM | − 23.9 ± 0.7 (3) | 6.8 ± 0.2 (3) | − 23.3 ± 0.5 (3) | 6.9 ± 0.2 (3) | − 22.9 ± 0.7 (3) | 6.4 ± 0.3 (3) |
Periphyton | − 23.4 ± 0.3 (3) | 5.4 ± 0.4 (3) | − 22.75 (2) | 6.2 (2) | − 19.9 (2) | 6.9 (2) |
Microphytobenthos | − 20.6 (1) | 3.7 (1) | − 20.5 (1) | 3.6 (1) | − 20.2 (1) | 4.0 (1) |
Filamentous green algae | – | – | − 22.0 (2) | 6.0 (2) | − 21.6 ± 1.4 (4) | 6.1 ± 0.3 (4) |
Macro-algae (Sargassum sp.) | – | – | – | – | − 16.8 (2) | 3.0 (2) |
Sea grass | – | – | – | – | − 13.7 ± 1.0 (3) | 4.0 ± 0.2 (3) |
C4 grasses | − 12.9 ± 0.3 (5) | 5.2 ± 1.2 (5) | – | – | – | – |
C3 Mangrove plant | – | – | − 28.4 ± 1.2 (8) | 5.4 ± 1.8 (8) | − 28.7 ± 0.8 (7) | 3.9 ± 1.9 (7) |
C3 plant | − 28.1 ± 1.3 (5) | 6.5 ± 2.5 (5) | − 27.9 (1) | 5.71 (1) | – | – |