Heavy Metals in Mangrove Ecosystems of Okinawa Island, Japan

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Heavy metal contents in a subtropical mangroves, Rhizophora stylosa and Candelia obovata, were studied. Heavy metals Pb, Cd, Cu, Cr, Ni and Zn in mangrove plants displayed accumulative partitioning in different tissues. All metals were accumulated in root tissues to level much higher than leave tissues. Higher levels of metals were also observed in detritus from surrounding mangrove plants. Generally, heavy metals in both mangrove species showed a similar trend in their distribution. Lead was accumulated in higher levels in green leaves compared to yellow leaves, while Cd, Cu, Cr and Ni were accumulated in higher levels in yellow leaves. Higher levels some metals in yellow leaves might indicate the metal release from plants to the environments. However, specific difference in heavy metal accumulation was reflected in both mangrove species; Pb and Zn levels were higher in Candelia obovata, while Cd, Cu, Cr and Ni levels were concentrated higher in Rhizophora stylosa


Keywords: Mangroves, Heavy Metals, Okinawa Island
Stream: Environmental Sustainability
Presentation Type: Paper Presentation in English
Paper: A paper has not yet been submitted.


Sakdullah Abdulkadir

Doctoral student, Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus
Nishihara, Okinawa, Japan


Makoto Tsuchiya

Professor, Faculty of Science, University of the Ryukyus
Nishihara, Okinawa, Japan


Ref: S08P0161