Abstract
Arsenic (As), copper (Cu), nickel (Ni), zinc (Zn), manganese (Mn), lead (Pb), iron (Fe), aluminum (Al), cadmium (Cd) and chromium (Cr) accumulations were evaluated in the gills, hepatopancreas, exoskeleton, and muscles of Pontastacus leptodactylus (crayfish) (Eschscholtz, 1823). The highest metal accumulation was observed in the gills and hepatopancreas. It was detected a negative correlation between Cr-Pb, As-Cr in the muscle tissue. All other metals were displayed positive correlations with each other in the gills, hepatopancreas, and exoskeleton. Strong positive correlations were determined between Ni-Cd and As-Pb in the gills, Ni-Cd, As-Pb and Al-Zn in the hepatopancreas, Zn-Mn and Fe-Cu in the exoskeleton, Ni-Cd, As-Pb, Zn-Mn, Al-Mn, Fe-Cu and Al-Zn in the muscle (r= 1.000). PCA and cluster analysis generally were supported the correlations observed. The correlations between divalent metals may be expressed by the role of divalent metal transporter 1 (DMT1) in the gathering of these metals.
Highlights
Heavy metal pollution in the aquatic environment is a major problem
Principal Component Analysis (PCA) using Varimax normalized rotation and Cluster analysis were calculated for each tissue
PCA indicates that three components explain about 87.468% for the exoskeleton, 74.713% for the gills, 84.565% for the hepatopancreas and 88.055% for the muscle, total variance of the for each tissue in the data set
Summary
Heavy metal pollution in the aquatic environment is a major problem. By inhalation, or skin contact, heavy metals may penetrate crustaceans’ tissues. Penetration and accumulation of heavy metals in the tissues may cause some debilitating chronic discomfort (Tunca et al 2013a). Aquatic organisms can accumulate metals from surrounding water, sediment and food sources into their bodies (Terra et al 2008). Crayfishes are potential indicators for metal accumulation, because of their benthic and solitary life forms, omnivorous nutrition style, long life cycle, slow movement, etc. They are useful due to large enough to be sampled from different body tissues and the ability of accumulating heavy metals
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