علوم زیستی دریا
shafa hoveizavy; ahmad savari; simin madiseh; babak doustshenas; hosein pasha
Volume 11, Issue 1 , November 2012, Pages 1-15
Abstract
Presence of each pollution and changing in the marine ecosystem have sever impacts on Biotic factors and economic ecological potential in this valuable area. Thus, ecological health monitoring to evaluation of habitat health are important.In this study, AMBI(Azti Marine Biology Index) was used to evaluation ...
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Presence of each pollution and changing in the marine ecosystem have sever impacts on Biotic factors and economic ecological potential in this valuable area. Thus, ecological health monitoring to evaluation of habitat health are important.In this study, AMBI(Azti Marine Biology Index) was used to evaluation health of Bahrakan coastal area as a main fisheries and petroleum extraction ground. The results showed studied area classified in good ecological status. The dominance species was from Ophiuridae family with ecological group II. based on richness and diversity index value, studied area are classified in bad ecological status. This results discordantly can caused due to differences in influences variable. Low rate of water exchange, high degree of temperature and salinity maybe were lead to decreasing in macrobenthic richness and diversity index values but AMBI result that get from ratio between sensitive and resistant species, shows good ecological status.
eelia eatemadi; ahmad savari; Tooraj Valinassab; Nasrin Sakhaei
Volume 11, Issue 1 , November 2012, Pages 16-30
Abstract
This study was carried out in three inter tidal zones in the Iranian coast of Gulf of Oman, in 2010 to identify the species belonging to Family Ocypodidae and to investigate effect of monsoon on ecology of crabs. Two species of genus Uca (U. sindensis and U. iranica) from Jask and Khour-Khalasi study ...
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This study was carried out in three inter tidal zones in the Iranian coast of Gulf of Oman, in 2010 to identify the species belonging to Family Ocypodidae and to investigate effect of monsoon on ecology of crabs. Two species of genus Uca (U. sindensis and U. iranica) from Jask and Khour-Khalasi study area and one species of genus Ocypode (O. rotundata) from Vanak beach were identified. The results were used to verify previous reports on species identification. Monsoon was found to affect distribution and frequency of these crabs. The maximum and minimum relative density were observed in pre-monsoon (May, 9.33 individual/m2) and monsoon (September, 6.38 individual/m2), respectively. Dense distribution of Uca was found in the muddy beaches of Khour-Khalasi and the genus Ocipode in the sandy beaches of Vanak area.
علوم زیستی دریا
Fatemeh Fadakar Masouleh; Bagher Mojazi Amiri; Alireza Mirvaghefi; Mohammad Ali Nematollahi
Volume 11, Issue 1 , November 2012, Pages 31-40
Abstract
Cadmium is one the common heavy metals that usually enters the Caspian Sea and the riverine ecosystems. Effect of Cadmium on spermatogenesis in Caspian kutum and motility of spermatozoa were studied. At first, kutum testis was exposed to Cadmium using in vitro testis culture in 10-5, 10-6 and 10-7 M ...
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Cadmium is one the common heavy metals that usually enters the Caspian Sea and the riverine ecosystems. Effect of Cadmium on spermatogenesis in Caspian kutum and motility of spermatozoa were studied. At first, kutum testis was exposed to Cadmium using in vitro testis culture in 10-5, 10-6 and 10-7 M concentration of CdCl2 solution for 3 and 6 days and in the second experiment, spermatozoa motility was evaluated after exposure to 0, 0.01, 0.1, 1, 10, 100 and 1000 mg/l of CdCl2 solutions. With the increase in Cadmium concentration, due to the reclining effect of Cadmium on spermatogenesis, the number of spermatocytes and size of germ cells decreased significantly. Motility of spermatozoa decreased significantly with increasing Cadmium concentration and its motility stopped in 1000 mg/l. Reduction in quality and quantity of germ cells could impair offspring production and recline their viability and thus posing threats on valuable kutums stocks.
علوم غیرزیستی دریا
Hosein Farjami; Mohammad Taghi Zamanian,; Akbar Rashidi Ebrahim Hesari,; Seiied Ali Azarmsa,
Volume 11, Issue 1 , November 2012, Pages 41-48
Abstract
Wind is a major factor which induces oceanic currents and many theories including the Ekman theory have considered the wind induces currents. In this paper a numerical process has been used for forecasting of oceanic currents based on this theory. The survey has been done in an artificial five layer ...
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Wind is a major factor which induces oceanic currents and many theories including the Ekman theory have considered the wind induces currents. In this paper a numerical process has been used for forecasting of oceanic currents based on this theory. The survey has been done in an artificial five layer oceanic basin with smooth bottom of 120 meters, considering the geographic position of Persian Gulf. Primitive equations were solved on earth’s spherical coordinates system with sigma as vertical coordinate by finite element method. Vertical profile of predicted current vectors showed the complete formation of Ekman Spiral in the basin. This experimental simulation is a new approach for confirmation of Ekman Theory.
علوم زیستی دریا
Gholamreza Eskandari; Ahmad Savari; Perita Kochanian; Aseiied aminollah Taghavi Motlagh
Volume 11, Issue 1 , November 2012, Pages 49-57
Abstract
In the present study, length structure, mortality and exploitation rate of Otolithes ruber during a ten-year period were studied. Sampling was carried out by using bottom trawl net in the fishing area in Northwest of Persian Gulf over 1 year study period. Length data was also collected from fisheries ...
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In the present study, length structure, mortality and exploitation rate of Otolithes ruber during a ten-year period were studied. Sampling was carried out by using bottom trawl net in the fishing area in Northwest of Persian Gulf over 1 year study period. Length data was also collected from fisheries research institute and fishery organization. Age determination was done by reading annual rings on sectioned otolith. Growth parameters were calculated based on age and length data. These data were used to estimate natural mortality rate. Total mortality was obtained from the age curve. Logarithmic catch and natural mortality were calculated from Pauly's equation. The averages of length in the last ten years were 35 to 39 cm. The samples ranged in length from 12 to 58 cm with the maximum frequencies between 28-44 cm. Length distribution was normal in this study. The maximum catch was composed of fish in the 40 to 48 cm length range with an average age of 2 to 3 years. The average total mortality, natural mortality and fishing mortality were 0.98, 0.56, and 0.42 respectively. Mortality was higher in age group 0 and age group 1, but mortality of the other age groups dramatically decreased. Exploitation rate in the last ten years were 0.42 indicating a near complete exploitation. Based on the results a more effective exploitation strategy is suggested in this region.
علوم زیستی دریا
Masoomeh Mahmoodi; Alireza Safahieh; Yadollah Nikpour; Kamal Ghanemi
Volume 11, Issue 1 , November 2012, Pages 58-67
Abstract
In order to study concentration of polycyclic aromatic hydrocarbons in seawater from Bushehr coast and for comparison with available guidelines samples of seawater were collected from five different stations along the Bushehr coast in August and February 2011. PAHs were extracted by Hexane solvent and ...
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In order to study concentration of polycyclic aromatic hydrocarbons in seawater from Bushehr coast and for comparison with available guidelines samples of seawater were collected from five different stations along the Bushehr coast in August and February 2011. PAHs were extracted by Hexane solvent and analyzed using HPLC system (Knauer). Results showed that tPAHs concentration in seawater were 31.0, 20.8, 4.0, 17.6 and 12.3 µg l-1, in August and 38.4, 23.0, 5.4, 19.3 and 17.2 µg l-1 in February respectively, at stations Rafael, Sheghab, Abshirinkon, Lian and Helyleh. The concentrations of tPAHs in the seawater were not significantly different during August and February (P>0.05). Significant difference was observed between tPAHs concentration between the stations (P<0.05). The tPAHs concentration was maximum in Rafael and its minimum was found in Abshirinkon., The tPAHs concentration in Bushehr area was relatively higher compared to other locations of the world. Even though concentrations of anthracene, phenanthrene, fluoranthene and pyrene were above the Canadian Environment Guidance, the carcinogenic compounds appeared in lower concentrations than the non-carcinogenic PAHs. Since Bushehr coastal waters is contaminated by PAHs, precise monitoring and control of oil discharge into the coastal waters as well as reduction of urban effluents input should be undertaken. Meanwhile the continuous monitoring of PAHs compounds in the area is recommended.
Sahar Kalantar Hormozi; Mehran Javaheri Baboli; Abolfazl Askari Sari
Volume 11, Issue 1 , November 2012, Pages 68-76