:: Volume 7 - March and June ::
JPG 2016, 7 - March and June: 61-70 Back to browse issues page
Metallothionein biosynthesis as a detoxification mechanism of heavy metals (Hg,Cd,Pb,Cu,Zn) in green sea turtles (Chelonia mydas)
Mahmood Sinaei
Department of fisheries, Chabahar branch, Islamic Azad University, Chabahar, IR Iran
Abstract:   (496 Views)
In this study, heavy metals (Hg,Cd,Pb,Cu,Zn) and metallothionein (MT) biosynthesis were
measured in blood of green sea turtles (Chelonia mydas) nesting on the northern coast of the Sea
of Oman. Heavy metals concentrations in the sea water, the sediments, the blood samples ranged
between 0.02-8.43 μg/l, 0.06-10.32 μg/l, and 0.16-36.78μg/g (ww), respectively.The highest
concentration of heavy metals were measured at Ahmad rizeh followed by Ramin>Lipar >Kacho>
and Tang Provinces. The concentrations of heavy metals in the coastal water and sediment were as
follows; Zn>Cu>Pb>Cd>Hg. There were no significant differences between concentrations of
heavy metals in different clutches laid in a nesting season. The lowest MT biosynthesis was
recorded (115.7 ± 18. 12 μg/g dry weight) at the Tang sampling sites, while the highest was
registered (276.4 ± 22.18 μg/g dry weight) at the Ahmadrizeh. The relationship between
metallothionein biosynthesis and heavy metals in the blood samples, the sea water and the
sediment were significant (p<0.05). Significant relationship was found between biomarker and
heavy metals in this study, which indicates that green sea turtle (C. mydas) have high capacity in
rapid response and detoxification of heavy metals on the northern coast of the Sea of Oman. The
biomarkers measured in this study were useful as a first investigation into the biological effects of
heavy metal pollution, as well as in determining the bioavailability of pollution.
Keywords: Sea water, Sediments, Blood, Pollution, bioavailability, Chelonia mydas
Full-Text [PDF 220 kb]   (129 Downloads)    
Type of Study: Applied Research | Subject: Marine Biology
Received: 2018/07/4 | Accepted: 2018/07/4 | Published: 2018/07/4


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Volume 7 - March and June Back to browse issues page