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Articles by S.M.B. Nabavi
Total Records ( 6 ) for S.M.B. Nabavi
  M.A.Salari Aliabadi , S. Rezvani Gilkolaei , A. Savari , H. Zolgharnein and S.M.B. Nabavi
  Genetic divergence within and between wild populations of cobia, Rachycentron canadum (L.) was assessed by means of microsatellite analysis in the Persian Gulf and Oman Sea. Ten microsatellite markers were used to estimate the level of genetic diversity within six wild populations of cobia and the degree of genetic differentiation between them was compared. Mean observed and effective allele number was 12.357 and 8.319, respectively. Mean observed and expected heterozygosity was 0.655 and 0.874, respectively. Based on Analysis of Molecular Variance highest F-statistics (0.063) was observed when comparing specimens from Dayer Port zone and Pozm of Chabahar zone. Highest genetic distance (0.258) and lowest genetic resemblance (0.223) were observed between specimens from Dayer Port zone and Beris of Chabahar zone. The present study showed that at least three different populations of Rachycentron canadum were found in the northern coasts of Persian Gulf and Oman Sea.
  H. Zolgharnein , M. Kamyab , S. Keyvanshokooh , A. Ghasemi and S.M.B. Nabavi
  Genetic variation of four populations of Avicennia marina encompassing the Iranian coastal areas of Persian Gulf were studied using five microsatellite loci. The average number of alleles per locus per population ranged from 4 to 4.6, showing no significant difference among the four populations. The observed heterozygosity (Ho), ranging from 0.782 to 0.960 with an average of 0.864, was comparable in the Iranian populations and much higher comparing to the earlier studies on A. marina in the worldwide range. Significant to highly significant deviations from Hardy-Weinberg expectations were observed in 10 out of 20 (five loci H four populations) cases. Most of Fis values were negative and significantly different from zero, thus suggesting excess of heterozygosity. The microsatellite analysis showed low genetic differentiation among the populations (mean Fst = 0.044), which could be explained by the remarkable gene flow (Nm>1) among populations.
  B. Doustshenas , A. Savari , S.M.B. Nabavi , P. Kochanian and M. Sadrinasab
  In this study, the Chesapeake Bay Benthic Index of Biotic Integrity (B-IBI) was selected in an attempt to describe ecological health of soft bottom channels (Khowr-e Musa) in North of the Persian Gulf. Most of study area was found to be in degraded or severely degraded conditions. B-IBI scores were ranged between 1 and 3.86. Comparison of macrobenthos abundance and organic content between two developmental periods showed significant difference (p<0.05). After the establishment and development of petrochemical industries, the abundance of macrofauna decreased (809 to 239 individuals m-2) and organic content increased leading to organic enrichment (15.3 to 22.4%). Three new sources of organic matter were found to be important namely industrial waste, sewage and mangrove litter. After 1999 about 6 millions Avicennia marina tree were planted near petrochemical zone in the area. Study area changed rapidly in the last decade and region is under severely anthropogenic impacts. The present study showed that Khowr-e Musa is under both natural stress and anthropogenic impacts and two main impacts could be attributed to the organic enrichment and to the dredging. Choice of suitable management plans and metric controls could help to the salvage of the largest tidal channel complex in Persian Gulf.
  N. Sakhaie , A. Savari , P. Kochanian , S.M.B. Nabavi and J.G. Marammazy
  The present information is based on the study of the zoeal stages of Hexapus sexpes. A single ovigerous female of Hexapus sexpes was collected from the North West Persian Gulf (29°56'14"S,49°0288"W) in April 2009. Female was maintained in aquarium containing natural sea water at 25°C until the eggs hatched. The present study describes the zoeal stages of Hexapus sexpes. A complete description and illustration of larval features is provided and a comparison with closely related species (Spiroplax spiralis and Lambdophallus anfractus) showing known larval development is presented. The zoeal stages of H. sexpes are very similar to that of L. anfractus. The zoeal of two species, however, could separate by the number of setae on the maxillule and maxilla.
  P. Shokat , S.M.B. Nabavi , A. Savari and P. Kochanian
  The aim of present study was to examine the macro invertebrates as an assessment tool for characterization of the state of Bahrekan estuary in Persian Gulf, by using different biotic indices. An investigation on benthos was carried out during autumn 2008 to summer 2009 in the Bahrekan estuary (Persian Gulf). In order to identify and assess the benthic community structure, seasonal sampling was done from 21 stations with three replicates using van veen grab (./285 m2). The ecological indices, such as (AMBI, BI and Bentix), Shannon-Wiener index (H'), species richness (S) were applied to the available benthic species data, and evaluated comparatively. The grain size of sediments and total organic matter as essential factors in distribution and population diversity of macrobenthos communities were also analysed. According to the results, 17 groups of macrobenthos were identified. Out of 111 genus/species identified in this study, Gastropoda was the dominate group (79.8%), followed by Bivalvia (5.5%). Pyrgohydrobia sp. belonged to gastropoda was dominant in all of seasons. The results showed that all of the stations are characterized as muddy bottom and Bahrekan estuary are classified in slightly to moderate pollution status.
  B. Moghaddasi , S.M.B. Nabavi , G. Vosoughi , S.M.R. Fatemi and S. Jamili
  Abundance and distribution of benthic Foraminifera, in the Northern Oman Sea (Iranian side) continental shelf sediments was studied. Sediment samples were gathered in Winter 2006, from eight stations ranging in depth from 30 to 103 m. Environmental conditions including water depth, temperature, dissolved oxygen, salinity, pH, grain size, total organic matter and calcium carbonate concentration were measured and their relationship with the distribution of benthic foraminifera was discussed. Forams were the most abundant meiobenthic group in nearby all the stations. The suborder ROTALIINA was dominant in the northern region while LAGENINA, MILIOLINA and TEXTULARIINA, were being abundant in the northwest region too. LAGENINA were being very abundant in the stations with higher depth. From the total 40 species belonging to 24 genera, Ammonia beccarii was common in the whole research region. Water depth, salinity and substrate seemed to be the most important environmental factors controlling the distribution of benthic foraminifera. None or rare structural abnormal and oil polluted individuals, in nearby all stations, leading to the clean benthic environment of the Oman Sea benthic zone.
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