Figure 1.
The map of South Aceh district showing sampling locations (red circle)
Abbildung 1. Die Karte des Probenahmebezirks Süd-Aceh zeigt Probenahmeorte (roter Kreis)
Figure 2.
The sampling location sceneries of Rasian estuary (a) and Asahan estuary (b)
Abbildung 2. Die Szenerien der Probenahmeorte der Rasian-Mündung (a) und der Asahan-Mündung (b)
Table 1.
Composition of macrozoobenthos in the Rasian and Asahan river estuaries
Tabelle 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 | ||
[i] Note: RRE = Rasian River estuary, ARE = Asahan River estuary, √ = present, - = absent
Figure 3.
Photographs of the macrozoobenthos found in the Rasian River and Asahan River estuaries
Abbildung 3. Fotos des Makrozoobenthos, die in den Flussmündungen des Rasian River und des Asahan River gefunden wurden
Table 2.
Density, diversity, uniformity, and dominance indices of macrozoobenthos in the Rasian and Asahan rivers
Tabelle 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 |
Table 3.
The average concentration of heavy metals Hg, Cd, and Pb in the Funus ater sample collected from Rasian River and Asahan River estuaries
Tabelle 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 |