2024-03-29T17:03:54+04:30
http://joc.inio.ac.ir/browse.php?mag_id=2&slc_lang=fa&sid=1
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Weekly variation of phytoplankton community structure in the Strait of Hormoz
Alireza
Mahvari
mahvary@yahoo.com
Sakineh
Doodi
Phytoplankton community structure and environmental parameter of water were carried out at weekly intervals for a period of one year from April 2004 to March 2005 at two stations in the Strait of Hormoz. 92 species of phytoplankton belonging to 42 Genus from Bascillariophyceae (29 genus), Dinophyceae (12 genus) and Cyanophyceae (1 genus) were identified. The result shows that Bascillariophyceae (95%) is the major group of phytoplankton and Dinophyceae (3%), Cyanophyceae (2%) were the groups which followed. The maximum density of Bascillariophyceae community was 1415200±348182 cell/l in October, Dinophyceae 20433±1790 cell/l and Cyanophyceae 96367±19140 cell/l in July and also the higher population of phytoplankton were found in warm season. In this study there were positive significant (P<0.05) correlation coefficient between phytoplankton density and two environment parameter (Temprature & pH). Dinophyceae and Cyanophyceae showed negative significant (P<0.05) correlation with dissolve oxygen and only Cyanophyceae showed positive significant (P<0.05) correlation with salinity. The maximum significant (P<0.05) correlation coefficient determined between pH and Cyanophyceae (r = 0.65). The maximum value of Shannon Index was 3.978 in winter and the minimum 0.502 in summer.
Phytoplankton
Population density
Environmental parameters
Diversity
Strait of Hormoz
Persian Gulf
2010
7
01
1
10
http://joc.inio.ac.ir/article-1-9-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
The effect of sublethal concentrations of cadmium on some biochemical parameters in the blood of Silver Carp (Hypophthalmichthys molitrix)
Ali Reza
Keykhosravi
akeykhosravi@yahoo.com
Azadeh
Atabati
Jafar
Vatandoost
Hadi
shams
Mahshid
Jalili
Hassan
Rooki
Cadmium is a non-essential heavy metal so it is lethal at low concentrations and it is the most toxic pollutant in aquatic environments. Cadmium cans directly affect the physiological and biochemical parameters of aquatic animals blood. The aim of the present study is to determine the effect of sub lethal concentration of cadmium on Silver Carp (Hypophthalmichthys molitrix) using a two biochemical parameter. Twenty specimens of silver carp were exposed to various concentrations of cadmium (0, 0/5, 1/0 and 1/5 milligram per liter) for a period of 96 hours. In this study the, level of protein and glucose of plasma were chosen as biomarkers. Results of this study showed that sub lethal concentrations of cadmium affected the levels of plasma protein and glucose in fish significantly, With increasing cadmium concentration, the level of protein decreased and the level of glucose was increased (P≥0/005). Common reasons for decreasing and increasing the amount of serum protein and glucose are changing in the level of the livers glycogen and preventing protein synthesis respectively.
Cadmium
Silver Carp (Hypophthalmichthys molitrix)
Protein
Glucose
2010
7
01
11
16
http://joc.inio.ac.ir/article-1-10-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Attached fauna population on artificial reef in north west of the Persian Gulf costal water
Gholam Reza
Eskandari
eskandari1344@hotmail.com
Foziyeh
Esmaili
Simin
Dehghan Madiseh
Sara
Sabzalizadeh
This study was carried out during two years study from oct. 2005. to sep. 2007 in Bahrekan coastal waters in Northwest of the Persian Gulf. Sampling was done Seasonally from 5 stations (4 stations in artificial reef site and one station in muddy soft bottom area as a control site). Generaly 14 and 74 groups of attached fauna were observed in the first and second year of study respectively, and the most dominant groups were barnacles, anthozoa, spongs, bryozoans, echinodermata, isopoda, polychaets and gastropods. 42 species of decapods crustacean and coelenterate only in reef site and 12 species of mollusk only in control site were observed. 18 species were common between two sites. Biomass variations were observed in different seasons and the highest biomass were found in winter due to barnacle abundance.
Artificial reefs
Bahrekan
Attached amimals
Identification
Biomass
2010
7
01
17
26
http://joc.inio.ac.ir/article-1-11-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Population dynamics, dispersal and reproductive cycle of the Nereis diversicolor, in the Noor Coast-The south of the Caspian Sea
Mehrshad
Taheri
mehrshadtaheri@yahoo.com
Jafar
Seyfabadi
Behrooz
Abtahi
Maryam
Yazdani Foshtomi
Population dynamics and reproduction cycle of the Nereis diversicolor in 5,15 and 30 meter depths of the Noor Coast was studied seasonally during a year. Results revealed the density and biomass of Nereis diversicolor during various seasons increased with increasing depths and total organic mater and decreasing sand percentage of the substrate.The annual average density and biomass of this worm were observed 128.70±23.58 ind/m2 and 476.66±88.21 mg/m2. Reproductive season was in spring and the maximal egg diameter was obtained 139.4 micrometer.
Population dynamics
Dispersal
Reproduction cycle
Nereis diversicolor
Noor Coast
Caspian Sea
Iran
2010
7
01
27
33
http://joc.inio.ac.ir/article-1-12-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Investigation the mechanism of the reshaping berm breakwaters
Mohammad Navid
Moghim
moghim@modares.ac.ir
Vahid
Chegini
Mehdi
Shafieefar
Peyman
Aghtouman
In this research, the mechanisms and various behaviours of reshaping berm breakwaters against waves attack have been investigated. These breakwaters are kinds of rubble mound breakwaters which their profiles reach to and equilibrium state after impinging of design waves. This research has been carried out using laboratory model method in a wave flume. Both regular and irregular waves were used in laboratory tests. The mechanisms and the behavior of currents inside and outside the structure were investigated by injecting dye stuff inside it and taking films.
Reshaping berm Breakwaters
Water waves
Laboratory model
Wave flume
2010
7
01
35
42
http://joc.inio.ac.ir/article-1-13-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Abundance and distribution of planktonic chaetognaths in the Strait of Malacca
Hamid
Rezai
rezaihamid@hotmail.com
Fatimah
Mohammed Yusoff
Akito
Kawamura
Abundance and distribution of chaetognaths was investigated from zooplankton samples collected from a series of four cruises (during the period November-December 1998, March-April 1999, August 1999 and July-August 2000) in the Straits of Malacca. The collections were made by vertical haul using NORPAC net of mesh size 140 m. Planktonic chaetognaths constituted 2.93%, 5.60%. 2.23% and 3.66% of total zooplankton population during cruises I, II, III and IV, respectively. Highest mean abundance of chaetognaths was recorded during cruise II (pre-SW monsoon) (mean of 724430 ind. m-3) and lowest during cruise III (post SW monsoon) (mean of 18932 ind. m-3). Two-way ANOVA showed no significant difference (p>0.05) in abundance of planktonic chaetognaths between the cruises but significant difference (p<0.05) between geographic locations within the Straits the interaction of these (cruise x geographic location) was also significant (p<0.05). Except for cruise II, with localized high abundance near Klang area, no consistent pattern of distribution was apparent among the cruises. Cluster analysis of the stations revealed two types of assemblages: low to moderate and high abundances, the latter being found in near-coastal areas. Except for the central part (with higher abundances in deeper waters), higher chaetognath abundance was found in 10-20 m depth stratum in the northern and southern parts of the Straits.
Chaetognaths
Abundance
Straits of Malacca
Monsoons
2010
7
01
43
43
http://joc.inio.ac.ir/article-1-14-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Temperature dependence of heptadecanoic and methyl-heptadecanoic fatty acids of Chiton lamyi in Chabahar Bay
Peyman
Eghtesadi Araghia
peghtesadi@gmail.com
Nooshin
Sajjadi
Chiton lamyi species collected from the intertidal zone of Chabahar bay analyzed seasonally for its fatty acid compositions in foot. Thirteen fatty acids identified in both sections by gas chromatography/mass spectroscopy. Major unsaturated fatty acids were palmitoleic acid, oleic acid and 11-eicosenoic acid and PUFAs included linoleic acid, eicosapentaenoic acid and arachidonic acid. Effects of monthly temperature and nutrients (silicate, phosphate and nitrate) investigated to detect seasonal variations of fatty acids. Pearson analysis results showed correlation among palmitic and oleic acids with silicate and phosphate linoleic and arachidonic acids with nitrate in Chiton lamyi internal tissues, but no correlation observed in foot. Heptadecanoic and methyl- heptadecanoic acids contents and temperature correlated strongly in Chiton lamyi foot.
Fatty acids
Chiton lamyi
GC/MS
Environmental parameters
2010
7
01
45
45
http://joc.inio.ac.ir/article-1-15-en.pdf
Journal of Oceanography
1562-1057
2476-6755
doi
2010
1
2
Evaluation of the sedimentation rate with 210Pb and 137Cs using the CRS model and estimation of the total inventory of sediment in the Algerian Coast
Abdolkader
Noureddine
noredinne-abdelkader@yahoo.fr
Lead-210 and to a lesser extent 137Cs are the most widely used radionuclides in soil erosion and recent radiogeochronology studies. This is basically due to their appropriate half-life, suitable for studying sedimentary processes occurring in the last 100 – 150 years. In coastal systems, sediments are transported by rivers to the coastal ocean, deposited under the influence of several marine processes. A study was carried along the Algerian coast, between 1999 and 2004, under the framework of the IAEA regional project RAF/7/004. Sediment cores were collected from different stations as given in figure 1 on board of the research vessel of M.S. Benyahia of ISMAL in collaboration with COMENA and IAEA, in order to study sediment accumulation in this area. For this purpose, 210Pb and 137Cs were determined in sediment sections, using direct counting by gamma spectrometry analysis. The accuracy of their quantification is mainly dependent on the errors including ambient background variation, attenuation of the 210Pb 45 kev gamma ray in the sample and efficiency calibration. Vertical distribution of 210Pb and 137Cs in sediments cores were used as a tool to establish the sediment chronology and to estimate the total inventory in the coastal environment. Concentrations in Bq/kg dry weight of 210Pb and 137Cs were determined in the four sediment cores. For concentration levels of 137Cs it ranges from (1.3±0.1) Bq/Kg to (12.8±0.8) Bq/ Kg with an average value of 7.5 Bq/Kg, and for 210Pb concentrations in Bq/Kg dry weight it was found to be in the range of (57±5 to 895±98) Bq/Kg dry weight. The estimated sedimentation rates deduced from the 210Pb and 137Cs concentrations profiles (some of them are presented in figure 2) and using the CRS model [1], range from 20 mm/yr to 27 mm/yr. Sedimentation rates and total inventories were determined at each station and maximum peaks were identified. Data obtained in this work were compared to those carried out in the same area by other authors, [2], [3].
Sedimentation rate
CRS model
210Pb
137Cs
Algerian Coast
Gamma Spectrometry
2010
7
01
47
47
http://joc.inio.ac.ir/article-1-16-en.pdf