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Articles by Zaidi Che Cob
Total Records ( 2 ) for Zaidi Che Cob
  Mohammad Mokhtari , Mazlan Abd Ghaffar , Gires Usup and Zaidi Che Cob
  Fiddler crabs burrow creates oxic-anoxic interfaces on the burrow walls. Accordingly burrow walls represent the transitions site between oxic and anoxic condition where the sediment properties varied significantly across it. In this study the burrows of three species of fiddler crabs including Uca rosea, Uca forcipata and Uca pardussumieri were sampled at three depth layers. Sediment properties of burrow walls including; temperature, redox potential, pH, density, porosity, water content, organic content, chlorophyll content and solid phase iron pools were measured to determine the magnitude of burrow effects on mangrove sediments. The results indicated that U. paradussumieri effectively reduced the sediment porosity of surrounding sediments down to 45%. Oxidized layer was more extended around U. paradussumieri burrows. Burrow walls of U. forcipata and U. paradussumieri contain higher water content than ambient sediment and burrows of U. rosea efficiently decreased the organic content of sediment. The PCA biplots indicated that the burrow walls of the all three species of fiddler crabs at 3 and 8 cm depth were correlated with oxidized iron. Ambient sediments of U. forcipata habitat were correlated with reduced iron and organic content. At 20 cm depth, burrow walls of U. paradussumieri were highly correlated with water content, while ambient sediment was correlated with reduced iron. The results of this study revealed that the thickness of oxidized layer varied according to sediment depth and burrow volume. Consequently the burrow effect varied significantly among different species of fiddler crabs as results of different habitat characteristics, sediment types and crab size.
  Mustafa Rahouma , M. Shuhaimi-Othman and Zaidi Che Cob
  Environmental pollution has become a source of concern and inconvenience to the world, the study was conducted to evaluate some selected heavy metals on Acetes shrimp. The present research project was undertaken to determine heavy metal (Zn, Cd, Pb and Mn) in the tissue of shrimp (Acetes indicus) in two different sites (Malacca and Kedah) on the west coast of Peninsular Malaysia. Samples were collected in this study during the months August, September, October and November and determine the concentrations of heavy metals zinc, lead, cadmium and manganese by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The results show that in general, the highest heavy metals concentrations were detected in samples taken from Malacca than Kedah. The heavy metal concentration in this shrimp varied significantly depending upon the months and sample station from where the shrimp was collected. In Malacca, the highest concentration level of Zn was detected in the Acetes shrimp (45.79±2.54 μg g-1 dry weight) in October 2010 followed by that of Kedah reported in September (45.08±2.93 μg g-1). The highest concentration level of Cd was detected in Acetes at Malacca 0.83±0.64 μg g-1 in September, whereas it was 0.21±0.04 μg g-1 in November at Kedah while the highest concentration level of Pb was recorded in Malacca which was 1.29±0.85 μg g-1 in September while it was 0.55±0.12 μg g-1 in October at Kedah. The highest concentration level of Mn was detected in A. indicus in Malacca recorded 6.95±1.19 μg g-1 in August while it was 6.10±1.01 μg g-1 in November at Kedah. However, the concentrations of heavy metals in Acetes indicus collected from Malacca and Kedah were within the permissible levels and are safe for the human consumption and public health.
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