Alireaza Safahieh; Sahel Pakzadtoochaei; Mohammad Taghi Ronagh; Bita Archangi; Mohammad Ali Hamzeh
Volume 12, Issue 3 , September 2014, , Pages 15-25
Abstract
Heavy metals in marine ecosystems are from both natural and anthropogenic sources. The monsoon is a natural phenomenon that can effect the heavy metals concentration. The monsoon can affect heavy metal concentration in coastal areas through rainfall and leaching and also disrupting of water layer. The ...
Read More
Heavy metals in marine ecosystems are from both natural and anthropogenic sources. The monsoon is a natural phenomenon that can effect the heavy metals concentration. The monsoon can affect heavy metal concentration in coastal areas through rainfall and leaching and also disrupting of water layer. The effect of monsoon on changes of concentrations heavy metals such as Cd, Cu, Ni, Pb and Zn in the sediment of Chabahar coast were studied in 2010. Samples were collected from the sediment of Gwatr, Beris, Ramin, Chabahar, Tis and Pozm stations in premonsoon, monsoon and post monsoon seasons (May, August and November respectively) during low tide. After preparation of samples, heavy metal concentration was determined by using the atomic absorption spectrophotometer. The concentration of Cd, Cu, Ni, Pb and Zn were 0.36, 4.97, 17.14, 8.88 and 24.93 µg/g dw respectively. The Cd concentration in the sediment was influenced by regional sources. The increase of Cu and Zn concentration from monsoon until post monsoon could be caused by rainfall and disturbance in the coastal sediments. The increase of Pb concentration in monsoon and post monsoon could be due to rapid precipitations of Pb, this increase could be affected due to coastal runoff in monsoon and the resumption of the vessel’s activity in post monsoon.
Ali Vaboonian; Abdolali Movahedinia; Alireza Safahieh; Saeyd A Hedayati
Volume 12, Issue 3 , September 2014, , Pages 26-32
Abstract
Different pollutants as well as heavy metals have undesirable effects on aqutic organisms and potentially may affect humans as a final consumer in food chains. Cadmium is one of the elements in most industrial effluents and so study on the effects of this dangerous element on aquatic animals is very ...
Read More
Different pollutants as well as heavy metals have undesirable effects on aqutic organisms and potentially may affect humans as a final consumer in food chains. Cadmium is one of the elements in most industrial effluents and so study on the effects of this dangerous element on aquatic animals is very important and necessary. In this study, acute toxicity of Cadmium on the Yellowfin Seabream, Acanthopagrus latus under laboratory conditions were examined. All experiments were according the standard methods for 96 hours exposure. Concentrations of 0.1, 1, 10 and 100 mg/lit Cadmium chloride were used to determine the Range Finding Test. Therafter fish were divided into 8 groups of 12 individuals with 3 replicates (100-120 g) One group was considered as the control and other groups were exposed to 15, 25, 35, 45, 55 , 65 and 95 mg/lit Cadmium chloride respectively. Important environmental parameters such as pH, dissolved Oxygen and temprature were measured and recorded. Data were analyzed using SPSS program and Probit statistical method. According to the results, lethal concentration (LC50), maximum acceptable toxicant concentration (MATC), lowest observed effect concentration (LOEC) and no observed effect concentration (NOEC) of Cadmium chloride for Yellowfin Seabream were 34.97, 3.497, 35 and 25 mg/lit respectively.
Arash Shakouri; Seyed Mohamad Bagher Nabavi; Preeta Kochanian; Ahmad Savari; Alireza Safahiye
Volume 12, Issue 3 , September 2014, , Pages 51-62
Abstract
Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with ...
Read More
Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with 100m2 area were sampled with SCUBA diving method in each region. Temperature had significant variation among the stations and seasons. There is a positive correlation (99%) between salinity and sea cucumber density and a negative correlation (95%) between turbidity and density. PCA indicated that salinity, pH, turbidity and temperature had 82.78% of all variance of the environmental factors and other factors did not exhibit such a relation with sea cucumber dispersion. Northern stations (Sepah and Kalantary) were located in same category in Fall 2007 and Winter 2008. These stations had the least pH and the highest salinity and turbidity in Fall and the highest pH and the least turbidity in Winter. Southern stations (Beheshti and Hotel Daryai) located in the same category in summer and fall 2007. These stations had the most pH and the least salinity in the summer and the most temperature and turbidity in the fall.