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Ecological sensitivity of the Persian Gulf coastal region (Case study: Bushehr province)
J Nouri, A Danehkar, R Sharifipour
Journal of Applied Sciences and Environmental Management , 2007,
Abstract: Coastal area sensitivity evaluation is in fact, the evaluation of an extraordinary ecological rich region. This study has been based on established criteria and values. The aim of this sensitivity evaluation has been to give objectivity to the Bushehr Province coastline region, so as to be able to pinpoint areas requiring ecological protection. With this objective, initially, the boundaries of the area under evaluation were first established, based on the findings of the Integrated Coastal Zone Management plan (ICZM). Then, based on these parameters and by geo-referencing photo mosaic Land Sat Satellite images (2003) and IRS’ (2004) were taken and basic maps of two influential areas were evaluated within the above mentioned limits which included the coastal village boundaries. The coastal line of the area being evaluated (set back line) was 673.62 kms comprising an area of 384,810 hectares. In this research the blueprint of a linear mathematical model was planned according to the Analytic Hierarchy Process method backed by the Arc-GIS Software program. In this model the value of influencing sensitivity factors were not applied in the same manner but by determining weight coefficients, the value and importance of each factor was determined according to the amount of sensitivity inflicted on the specified environment. In total, in the area under consideration, about 30 percent were defined as very high sensitivity areas.
Intertidal scale worms (Polychaeta, Polynoidae and Sigalionidae) from the northern coasts of the Persian Gulf and Gulf of Oman  [cached]
Alieh Bonyadi Naeini,Hassan Rahimian
ZooKeys , 2009, DOI: 10.3897/zookeys.31.127
Abstract: Sampling of Polychaeta has been performed in the Persian Gulf and Gulf of Oman during December 2006 to October 2007. So far, 10 species belonging to six genera from two families have been identified. Seven species from the family Polynoidae (Lepidonotus natalensis, L. purpureus, Parahalosydnopsis arabica, Harmothoe hirsuta, H. liaoi, Paralepidonotus ampulliferous) and one species from the family Sigalionidae (Sthenelais boa) are new records for the Gulf of Oman. Thormora jukesii and H. marerubrum (Polynoidae) are new records for the Persian Gulf. Lepidonotus tenuisetosus could be recorded for both gulfs. The most diverse genera in the area are Lepidonotus and Harmothoe with each of them represented by three species. The most common species was Lepidonotus tenuisetosus, which was collected from 25 locations. The highest diversity of polychaetes species could be observed in rocky habitats containing stones covered with algae.
ENVIRONMENTAL GEOCHEMISTRY OF HEAVY METALS IN A SEDIMENT CORE OFF BUSHEHR, PERSIAN GULF
A. R. Karbassi, Gh. R. Nabi-Bidhendi and I. Bayati
Iranian Journal of Environmental Health Science & Engineering , 2005,
Abstract: In present study, the geochemistry of a sediment core from the Persian Gulf is investigated. The sources of trace elements (Cu, Zn, Pb, Ni, Cr, Mn) have been investigated by the method of cluster analysis as well as chemical partitioning techniques. Cluster analysis shows that Pb, Cu, Cr and Zn are originated from oil pollution sources taking into account Zn as an oil pollution indicator. Higher concentrations of Mn at depth of 7cm clearly shows the movement of Mn from the lower layer of the sediment core. Considerable amount of Mn, Pb and Cu are found in lithogenous portion The results of partition studies has revealed the percentile of anthropogenic portion of metals as: Mn (46%)> pb (40%)> Cu (18%)> Zn (12.8%)> Fe (2.4%)> Cr & Ni (0.03) Finally, the concentration of studied metals are compared with those of mean crust and mean world sediments. Though concentrations of a few metals are higher than mean crust and men world sediments but Cr in-spite of its higher concentration is mainly derived from natural resources. The results indicate that, a system that combines the two mentioned processes not only shortens stabilization time, but also improves the products quality. Combining the two systems resulted in a product that was more stable and homogenous; the product could meet the pathogen reduction requirements.
Serrasentis Sagittifer (Acanthocephala: Rhadinorhynchidae) from the Japanese Thread Fin Bream, Nemipterus japonicus, in Bushehr Waters of Persian Gulf
Seyed Saeid Ghaem Maghami,Majid Khanmohammadi,Mahnaz Kerdeghari
Journal of Animal and Veterinary Advances , 2012,
Abstract: This research evaluated, Acanthocephala infections in Nemipterus japonicus caught between December 2006 and January 2007 in the coast of Bushehr. Of 50 fishes examined 3 were infected, they were female and had light (4-8 worms) to heavily (168 worm) infection. This investigated Acanthocephala was turned out to be from Rhadinorhynchidae, Serrasentinae and Serrasentis sagittifer. This Acanthocephalan is one of most important pathogens parasite, which attach to the digestive system, especially intestine.
Numerical simulations of spreading of the Persian Gulf outflow into the Oman Sea  [PDF]
M. Ezam,A. A. Bidokhti,A. H. Javid
Ocean Science (OS) & Discussions (OSD) , 2010, DOI: 10.5194/os-6-887-2010
Abstract: A three dimensional numerical model namely POM (Princeton Ocean Model) and observational data are used to study the Persian Gulf outflow structure and its spreading pathways during 1992. In the model, the monthly wind speed data were taken from ICOADS (International Comprehensive Ocean-Atmosphere Data Set) and the monthly SST (sea surface temperatures) were taken from AVHRR (Advanced Very High Resolution Radiometer) with the addition of monthly net shortwave radiations from NCEP (National Center for Environmental Prediction). The mean monthly precipitation rates from NCEP data and the calculated evaporation rates are used to impose the surface salinity fluxes. At the open boundaries the temperature and salinity were prescribed from the mean monthly climatological values from WOA05 (World Ocean Atlas 2005). Also the four major components of the tide were prescribed at the open boundaries. The results show that the outflow mainly originates from two branches at different depths in the Persian Gulf. The permanent branch exists during the whole year deeper than 40 m along the Gulf axis and originates from the inner parts of the Persian Gulf. The other seasonal branch forms in the vicinity of the shallow southern coasts due to high evaporation rates during winter. Near the Strait of Hormuz the two branches join and form the main outflow source water. The results of simulations reveal that during the winter the outflow boundary current mainly detaches from the coast well before Ras Al Hamra Cape, however during summer the outflow seems to follow the coast even after this Cape. This is due to a higher density of the colder outflow that leads to more sinking near the coast in winter. Thus, the outflow moves to a deeper depth of about 500 m (for which some explanations are given) while the main part detaches and spreads at a depth of about 300 m. However in summer it all moves at a depth of about 200–250 m. During winter, the deeper, stronger and wider outflow is more affected by the steep topography, leading to separation from the coast. While during summer, the weaker and shallower outflow is less influenced by bottom topography and so continues along the boundary.
Spawning Season of Argenteus (Euphrasen, 1788)in the Northwest of the Persian Gulf and its Implications for Management  [PDF]
Amrollahi Narges,Kochanian Preetha,Maremmazi Jasem,Eskandary Gholam-Reza
Pakistan Journal of Biological Sciences , 2007,
Abstract: The spawning periodicity of silver pomfret, Pampus argenteus, was investigated in 627 specimens (137 female and 490 male) collected monthly by trawl net from the Northwest the Persian Gulf for a one year period (March 2004 to February 2004). Seven maturity stages were recognized by Kesteven scale. The length at first maturity (LM50) was calculated as 192 mm in combined sex. The overall sex ratio (female: male) was 1:3. Fluctuations in the Gonadosomatic Index (GSI) values and percentage of mature specimens suggested prolonged spawning season from May to October. There were two spawning peaks, the first one between May and July and the second in October. It is concluded that Iranian waters (in Khuzestan province)are the main spawning and nursery grounds for silver pomfret in the Persian Gulf.
Length-Weight Relationship and Spawning Season of Sphyraena jello C., from Persian Gulf  [PDF]
A. Hosseini,P. Kochanian,J. Marammazi,V. Yavari
Pakistan Journal of Biological Sciences , 2009,
Abstract: Length-weight relationship and spawning season of Pickhandle barracuda, Sphyraena jello (C.) were studied for one year in Boushehr waters of the Persian Gulf. In the present study, 311 specimens were collected during November 2006 to October 2007. The samples composed of 151 (48.55%) male, 160 (51.45%) female; the sex ratio was M: F = 1: 1.06. The b value ranged between 2.77 to 2.87 for male and female fishes, respectively. The relationship between body weight and length in total specimens was 2.82, indicating that this species show negative allometric growth. The peak spawning season of these fishes occur around spring, from April to June. The lowest Gonadosomatic Index recorded in August. The present study is the first record on length-weight relationship and spawning season of this species in the Persian Gulf region.
The structure of the Persian Gulf outflow subjected to density variations  [PDF]
A. A. Bidokhti,M. Ezam
Ocean Science (OS) & Discussions (OSD) , 2009,
Abstract: Oceanographic data and a dynamic model are used to consider the structure of Persian Gulf outflow. This outflow influences the physical properties of Oman seawater which appear in the CTD profiles of the Oman Sea. The observations show that thickness of the outflow, which is banked against the Oman coasts due to the earth rotation, is about 200 m with tongues extending east and north that may be due to the internal waves. A simple dynamical model of the outflow based on potential vorticity conservation is used to find the horizontal extension of the outflow from the coast. Typical mass transport estimate by the outflow is about 0.4 Sv, which is larger than those reported by others. This may be due to the fact the model is inviscid but the outflow is influenced by the bottom friction. Variability of the outflow structure may reflect the changing ecosystem of the Persian Gulf. Any change of the outflow source, the Persian Gulf Water (PGW), say salinity increase due to excessive evaporation (climate factor) or desalination (anthropogenic factors) of the PGW may change the outflow structure and the product waters in the Oman Sea. Hence, one can test different scenarios of changing the outflow source, the Persian Gulf Water (PGW), say by salinity increase due to excessive evaporation or desalination to estimate changes in the outflow structure and the product waters in the Oman Sea. The results of the model show that these can increase the outflow width and mass transport substantially.
The circulation of the Persian Gulf: a numerical study  [PDF]
J. K?mpf,M. Sadrinasab
Ocean Science (OS) & Discussions (OSD) , 2006,
Abstract: We employ a three-dimensional hydrodynamic model (COHERENS) in a fully prognostic mode to study the circulation and water mass properties of the Persian Gulf – a large inverse estuary. Our findings, which are in good agreement with observational evidence, suggest that the Persian Gulf experiences a distinct seasonal cycle in which a gulf-wide cyclonic overturning circulation establishes in spring and summer, but this disintegrates into mesoscale eddies in autumn and winter. Establishment of the gulf-wide circulation coincides with establishment of thermal stratification and strengthening of the baroclinic exchange circulation through the Strait of Hormuz. Winter cooling of extreme saline (>45) water in shallow regions along the coast of United Arab Emirates is a major driver of this baroclinic circulation.
The circulation of the Persian Gulf: a numerical study
J. K?mpf,M. Sadrinasab
Ocean Science Discussions (OSD) , 2005,
Abstract: We employ a three-dimensional hydrodynamic model (COHERENS) to study the circulation and water mass properties of the Persian Gulf, which is a large inverse estuary. Our findings suggest that the Persian Gulf experiences a distinct seasonal cycle in which a Gulf-wide cyclonic overturning circulation establishes in spring and summer, but this disintegrates into mesoscale eddies in autumn and winter. Establishment of the Gulf-wide circulation coincides with establishment of thermal stratification and strengthening of the baroclinic exchange circulation through the Strait of Hormuz. The latter is associated with winter cooling of extreme saline (>45 psu) water in shallow regions along the coast of United Arab Emirates. To validate the model results, we present a detailed comparison with observational evidence.
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