Figure 1.
Figure 2.
Figure 3.
Composition of macrozoobenthos in the Rasian and Asahan river estuariesTabelle 1_ Die Zusammensetzung des Makrozoobenthos in den Flussmündungen Rasian und Asahan
| Phylum | Class | Family | Species | Location | |
|---|---|---|---|---|---|
| RRE | ARE | ||||
| Mollusk | Bivalvia | Donacidae | Donax faba | √ | √ |
| Donacidae | Donax denticulus | √ | - | ||
| Donax trunculus | - | √ | |||
| Ostreidae | Saccostrea cucullata | √ | √ | ||
| Gastropoda | Terebridae | Hastula cinerea | √ | - | |
| Neritidae | Neritina turrita | √ | √ | ||
| Nerita picea | √ | - | |||
| Pachychillidae | Faunus ater | √ | √ | ||
| Planaxidae | Planaxis sulcatus | √ | - | ||
| Potaminidae | Terebralia palustris | √ | - | ||
| Terebralia sulcata | - | √ | |||
| Trochidae | Umbonium vertarium | √ | - | ||
| Arthropoda | Malacostraca | Ocypodidae | Ocypodidae kuhlii | √ | - |
| Hippidae | Emerita emeritus | √ | - | ||
| Eriphiidae | Eriphia smithii | √ | - | ||
| Portunidae | Charybdis affinis | √ | - | ||
| Total | Decapoda | Metapanaeus affinis | - | √ | |
| 14 | 17 | 14 | 7 | ||
The average concentration of heavy metals Hg, Cd, and Pb in the Funus ater sample collected from Rasian River and Asahan River estuariesTabelle 3_ Die durchschnittliche Konzentration der Schwermetalle Hg, Cd und Pb in der Funus ater-Probe, die aus den Flussmündungen Rasian River und Asahan River entnommen wurde_
| No. | Heavy metals | Unit | Method test | Tolerance threshold* | Estuary location | |
|---|---|---|---|---|---|---|
| RRE | ARE | |||||
| 1. | Mercury (Hg) | % | AAS | 0.001 | 0.0845 | 0.1115 |
| 2. | Cadmium (Cd) | % | AAS | 0.001 | 0.0002 | 0.0002 |
| 3. | Lead (Pb) | % | AAS | 0.008 | 0.0005 | 0.0005 |
Density, diversity, uniformity, and dominance indices of macrozoobenthos in the Rasian and Asahan riversTabelle 2_ Dichte-, Diversitäts-, Uniformitäts- und Dominanzindizes von Makrozoobenthos in den Flüssen Rasian und Asahan
| Location | Species | Density (ind./m2) | Diversity index (H′) | Uniformity index (E) | Dominance index (C) |
|---|---|---|---|---|---|
| Rasian River estuary | Donax faba | 3.67 | 2.24 (Moderate) | 0.84 (High) | 0.14 (No dominant species) |
| Donax denticulus | 5.00 | ||||
| Hastula cinerea | 1.67 | ||||
| Ocypodae kuhlii | 0.67 | ||||
| Emerita emeritus | 2.00 | ||||
| Neritina turrita | 7.33 | ||||
| Nerita picea | 2.33 | ||||
| Faunus ater | 13.33 | ||||
| Planaxis sulcatus | 1.00 | ||||
| Eriphia smithii | 0.67 | ||||
| Saccostrea cucullata | 3.67 | ||||
| Charybdis affinis | 0.67 | ||||
| Terebralia palustris | 4.00 | ||||
| Umbonium vertarium | 1.00 | ||||
| Asahan River estuary | Faunus ater | 88.3 | 1.05 (Moderate) | 0.54 (Moderate) | 0.43 (No dominant species) |
| Donax trunculus | 1.7 | ||||
| Saccostrea cucullata | 2.3 | ||||
| Terebralia sulcata | 162.0 | ||||
| Neritina turrita | 9.3 | ||||
| Donax faba | 18.7 | ||||
| Metapaneus affinis | 0.3 |