Macrozoobenthos diversity and heavy metal contamination in Faunus ater in the Rasian and Asahan rivers in the southern coast of Aceh, Indonesia

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