علوم زیستی دریا
Sahar Ahmadvand; Solmaz Shirali; Nasrin Sakhaei; Babak Doustshenas
Abstract
The Unionidae family is the most abundant family among freshwater bivalves which belongs to the Unionida order. Considering the nutritional, economic and environmental importance of bivalve molluscs, as well as the lack of information related to freshwater mussels of the Unionida order, especially the ...
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The Unionidae family is the most abundant family among freshwater bivalves which belongs to the Unionida order. Considering the nutritional, economic and environmental importance of bivalve molluscs, as well as the lack of information related to freshwater mussels of the Unionida order, especially the species belonging to the Unionidae family, as well as their global risk and concidering the importance of the ovary and the testis as an important organ of reproduction and survival and since histological studies are the most accurate method in determining the stages of the gonadal cycle, this research was conducted with the aim of investigating the histology of oogenesis and spermatogenesis in Unio tigridis of the Karun River. Sampling was done seasonally. For this purpose, the studied species after catching in every season were transferred to the histological laboratory, then they were biometrically identified using valid identification books and keys. After dissection, small pieces of gonads were separated and after tissue passage, they were examined histologically and histometrically. The results of the histological studies of the gonads showed that this species is often heterosexual. The results of the histological studies of gonads showed that out of 41 oysters in this study, there was only one hermaphrodite, and testicular and ovarian tissue were simultaneously observed in the gonad tissue. The ovary was asynchronous type because, at any time, all types of follicles in different stages of development (oogonia, previtellogenic oocytes, vitellogenic oocytes) were visible in the ovaries. The highest rate of development and maturation of both male and female gonads was observed in spring. It seems that the main breeding time of Unio tigridis species in the Karun River in the study area is in spring.
علوم زیستی دریا
Sanaz Ahmadi Falehi; Ahmad Savari; Nasrin Sakhaei; Faedeh Amini; Babak Doustshenas
Abstract
Planktonic crustaceans are of specific importance in energy transfer due to their location in the middle links of the food chain of aquatic ecosystems. Therefore, they directly affect the abundance and diversity of the higher categories of the food pyramid, especially stocks and fishery resources. In ...
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Planktonic crustaceans are of specific importance in energy transfer due to their location in the middle links of the food chain of aquatic ecosystems. Therefore, they directly affect the abundance and diversity of the higher categories of the food pyramid, especially stocks and fishery resources. In this study, the impact of a tidal cycle on the zooplanktonic Crustacean ecosystem in the estuarine Bahmanshir River (Northwestern Persian Gulf) was studied. Our samples were collected during the spring of 2018 by plankton net with mesh sizes of 100 μm. Samples were taken at 5 stations to have a tidal effect on the abundance of zooplankton, approximately from 8:00 to 18:00 every two hours. In general, 72 species belonging to 28 families related to 3 groups of crustaceans named Cirripedia, Cladocera, and Copeoda were observed. The highest percentage of relative abundance was related to Cladocera with 35%, which was caused by the abundance of Daphnia mendotae. The highest diversity (Shannon index = 2.71 ± 0.04) of copepods was revealed to be caused by the large number of species at station 5 (near the mouth of the Bahmanshir River). Most species among the families belong to the Acartiidae family, which has 10 species of Acartia. The results of PCA analysis showed that among environmental factors, salinity has a direct effect on the total density, density of Harpacticoida and Calanoida, in the first component. The tides appear to significantly affect the density and types of planktonic crustaceans during the mentioned springtime periods. Our results showed relatively strong influence of the tidal cycle on the spatial pattern of Copepod assemblages in the study area. This study may be useful for future biological monitoring and seawater salinity intrusion into rivers in the northwest of the Persian Gulf.
علوم زیستی دریا
Kobra Jalali; Babak Doustshenas; Ahmad Savari; Nasrin Sakhaei
Abstract
The transfer of alien and invasive species through the ballast water of vessels is one of the most important threats to aquatic ecosystems. This study aimed to investigate the ballast water of 10 vessels entering the export port of Majidiyeh Mahshahr in 2018. A sampling of zooplankton from each ...
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The transfer of alien and invasive species through the ballast water of vessels is one of the most important threats to aquatic ecosystems. This study aimed to investigate the ballast water of 10 vessels entering the export port of Majidiyeh Mahshahr in 2018. A sampling of zooplankton from each vessel was performed by filtering 100 litres of ballast water of each vessel using a plankton sampling net with 50 μm mesh with three replications. Simultaneously, environmental factors including dissolved oxygen, acidity, temperature, and salinity were measured with 3 replications in the ballast water of the vessels. The results of a one-way analysis of variance showed that there is a significant difference between the vessels entering the export port of Majidiyeh in terms of the average density of Copepods. The highest average density 3.2×104 ind/m-3 and the number of species (36 species) related to ARGO1 ship from Bandar Abbas and the lowest average density 1×104 and the lowest number of species (24 species) belonged to PRECIGIOUS and GUNISHLI from Fujairah, UAE, respectively. There was a significant positive correlation between the average density of Copepods with temperature and dissolved oxygen. In total, 3 orders, 20 families, 28 genera, and 56 species were identified. All identified species except Oithona davisae have been previously reported from the Persian Gulf. O. davisae species was found only on the CONSTANTINOS ship from the port of Fujairah, UAE. It is native to the coastal waters of East Asia, especially around Japan and China, and has been reported in the Black Sea, the central Mediterranean, and more recently in the Aegean Sea. This research can be important for assessing the potential risk of new invasive species as well as for improving the quantitative and quality management practices of ships' ballast water.
علوم زیستی دریا
Maryam GhasemiTirtash; Ahamd Savari; bita archangi; Nasrin Sakhaei; Neda Mehdipour
Abstract
Monitoring of benthic communities is important factor in ecosystem health studies. The Caspian Sea is considered as an independent zoogeographical region due to its diversity, specificity and endemism of its fauna. For studying frequency and distribution patterns of macrobenthic community, 5 transects ...
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Monitoring of benthic communities is important factor in ecosystem health studies. The Caspian Sea is considered as an independent zoogeographical region due to its diversity, specificity and endemism of its fauna. For studying frequency and distribution patterns of macrobenthic community, 5 transects along the Southern Coasts of Caspian Sea from Astara to Chaboksar were sampled. In each transect 3 stations with the depth of 1,5 and 10 meters were selected in perpendicular line to the beach .Physical parameters such as Temperature, Salinity, Dissolved Oxygen and pH were measured in addition to sediment grain size. Sampling has done twice a year (winter 2014 and summer 2015).Totally 38 macro benthos species were identified. Gastropods of Hydrobiidae family and polychaet Streblospio gynobranchiata were the dominant group with the contribution of 80% of total macrobenthos population. Average number of total benthos was 2250 individual/m2 in winter and 2630 individual/m2 in summer. Non-parametric statistical tests showed significant difference between number and frequency of species in different depths (p
علوم زیستی دریا
Nasrin Sakhaei; Masomeh Sheyamizadeh; Babak Doustshenas; Ahmad Savari; Mohammad bagher Nabavi
Abstract
The purpose of this study was to identify and investigate the density and distribution of copepoda and cladosera and the structural analysis of their dominant species in the Arvand river by SEM (scaning electron microscope). Sampling was conducted with 50 μm mesh size plankton net at 6 stations and ...
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The purpose of this study was to identify and investigate the density and distribution of copepoda and cladosera and the structural analysis of their dominant species in the Arvand river by SEM (scaning electron microscope). Sampling was conducted with 50 μm mesh size plankton net at 6 stations and four times (in different seasons) with three reputation. The samples were detected by phase contrast microscopy and SEM. Totally 15 species of copepoda and 5 species of cladocera were identified in the river. The highest density of planktonic crustaceans including copepoda and cladocera with a mean density of 9481 and 3155 individuals per cubic meter was calculated in summer. These species, Acartia faoensis, Canthocalanus pauper, Subecalanus flemingeri, Labidocera acuta, which accounted for 61% of the total copepods abundance and 54% of the cladosera abundance were related to Moina macrocopa and Daphnia longisoina. The integrity of river were study using saprobic index which showed mesosaprobic-β (medium pollution) with mean 2.48 point.
علوم زیستی دریا
N Nozarpour; M.B Nabavi; Ronagh M.T Ronagh; B Archangi; N Sakhai
Abstract
In this study, the molecular characteristics of Chiromantes boulengeri in 2014 from intertidal waters of Arvand River in the vicinity of Minoo island were investigated. So, in October 2014 specimens from intertidal of two area of Minoo island were collected and preserved in 70% ethanol, carried out to ...
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In this study, the molecular characteristics of Chiromantes boulengeri in 2014 from intertidal waters of Arvand River in the vicinity of Minoo island were investigated. So, in October 2014 specimens from intertidal of two area of Minoo island were collected and preserved in 70% ethanol, carried out to the khoramshahr University of Marine Science and Technology laboratory and examined. To fulfill the purpose, To extract the DNA, phenol- chloroform method were used and mitochondrial gene 16S rRNA was sequenced and compare with other species from GenBank NCBI. The morphological and phylogeny sequencing results showed that all specimens belong to Chiromantes boulengeri in the study area. By polymorphism analysis, there are mutation within C. boulengeri from two area of Arvand River and it seems that this species for its survival has adapted with different ecological conditions in the study area.
علوم زیستی دریا
shahram bazrafshan; nasrin sakhaee; ahmad savari; babak doustshenas; abdolali movahedinia
Abstract
Taxonomic studies on the Anomura larvae of the Persian Gulf are relatively few. This research has been done on larval stage of Diogenes sp. (Anomura: Diogenidae)on coastal waters of Bahmanshir River. Anomura is a group of decapodcrustaceans, including hermit crabsthat are cosmopolitan and could be found ...
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Taxonomic studies on the Anomura larvae of the Persian Gulf are relatively few. This research has been done on larval stage of Diogenes sp. (Anomura: Diogenidae)on coastal waters of Bahmanshir River. Anomura is a group of decapodcrustaceans, including hermit crabsthat are cosmopolitan and could be found from coastal waters to 5000 m in depth. The larval stages differ among families of Anomura. Anomura larvalsamples collected by plankton net (mesh size of 300 µm) from seven stations in February 2011 to October 2012. Planktonic larval were sampled from the Bahmanshir River in north of the Persian Gulf. The larval stages illustrated and described in detail for Diogenes sp. Finally Diogenes sp. were identified and their schematic figures were made using Camera Lucida. Maximum value of the average abundance of larvae (12.3±3.4 ind.m3) was recorded in May. Also positive relationship betweensalinity with frequency of Diogenes sp. were found significantly using spearman correlation coefficients (P< 0.05).
علوم زیستی دریا
mohsen heidari; hossein zolgharnine; n s; a m
Abstract
The purpose of this study was to evaluate the antioxidant properties of hydroalchoholic extractions of three species of green, brown and red algae. The highest and the lowest total phenol contents was in L. snyderia (113/9±0/69 mg gallic acid per gram of extract) and the green algae E. intestinalis ...
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The purpose of this study was to evaluate the antioxidant properties of hydroalchoholic extractions of three species of green, brown and red algae. The highest and the lowest total phenol contents was in L. snyderia (113/9±0/69 mg gallic acid per gram of extract) and the green algae E. intestinalis (72/36±6/05 mg gallic acid per gram of extract) respectively. The highest values of total flavonoid was founded in the red algae L. snyderia (41/05±1/95 mg Rutin per gram of extract) however, the lowest values was (12/7±0/41 mg Rutin per gram of extract) in the brown alga C. trinodis. L. snyderia showed the most antioxidant activity, and C. trinodis had lowest amounts of antioxidant potential by the radical, azinobis ethylen benz thiazoline sulphonic acid (ABTS) test. there were significant differences between anti-oxidant activities of algae according the ABTS test.
علوم زیستی دریا
mohsen heidari; hossein zolgharnine; nasrin sakhaei; abdolali movahedinia; a m
Abstract
The purpose of this study was to evaluate of bio diversity and density of brown algae in coast of Bushehr province in the Persian Gulf during warm and cold seasons. The most and lowest density of brown algae was in the spring (33±20Number in m2) and in autumn(17± 9Number in m2) respectively. The highest ...
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The purpose of this study was to evaluate of bio diversity and density of brown algae in coast of Bushehr province in the Persian Gulf during warm and cold seasons. The most and lowest density of brown algae was in the spring (33±20Number in m2) and in autumn(17± 9Number in m2) respectively. The highest density was belonged to species of Cystoserria myrica with(41±25)and it was dominant species among the six species of brown algae were sampled. The most of Margalef index(0/438) was observe at the mid, and mid litoral zone. The maximum value of the Shannon index(0/94) was belonged to the low, mid litoral zone. Most of species richness and dominance was revealed at autumn and highest indices of Shannon(0/76) was at spring. Brown algae in the spring had the most density (33±20/86 Number in m2). Species richness was detected the highest and lowest in Nuclear power Plant and Ganaveh stations in two seasons respectively. Higher levels of dominance and low diversity was in within the tidal zone.
Abstract
This study was done to identify larval stages and biodiversity of Dendrobranchiata planktonic communites in artificial reefs of Khuzestan coasts(Bahrekan area in Northwest Persian gulf) for one year from May 2011 to April 2012 monthly basis.Sampling was conducted using a plankton net with a spring 300 ...
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This study was done to identify larval stages and biodiversity of Dendrobranchiata planktonic communites in artificial reefs of Khuzestan coasts(Bahrekan area in Northwest Persian gulf) for one year from May 2011 to April 2012 monthly basis.Sampling was conducted using a plankton net with a spring 300 micrometers. Totally, from two superfamily: Penaeoidea and Sergestoidea, 3 families: Sergestidae, Luciferidae, Penaeidae were identified.From Penaeidae family, Metapenaeus affinis ,Penaeus indicus and Parapenaeopsis stylifera species, from Luciferidae family, Lucifer hanseni specie and from Sergestidae family, Acetes sp specie were identified and introduced. Also larval density of identified species in different months and stations are calculated and determined Metapenaeus affinis specie(With the average of number per cubic meter in 1029±830 )from Penaeidae family account for larval density is maximum in September. Finally, two abundance peak was observed that the first peak was in September and the second peak was in November.The maximum of relative frequency percentage in Penaeoidea superfamily related to mysisI stage and 62 percentage. The results obtained indicate that the artificial structures are well managed nursery area for Penaeidae shrimp. The maximum average value of Shanon-wiener index was in November (1.36) due to the presence of all species in the same month. Simpson index was lowest in November, which confirms the above conclusion.
Nasrin Sakhaei; Ahmad Savari; Babak Dostshenas; Freshteh Saraji
Abstract
This research has been done on larval stage of two species of Epialtidae's Family on coastal waters of Hengam Island (The Persian Gulf) in 2011 . Sampling is done by plankton net with 300 μm mesh size by method of diagonal traction from bottom to surface in 6 station for a year from winter 2011 to ...
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This research has been done on larval stage of two species of Epialtidae's Family on coastal waters of Hengam Island (The Persian Gulf) in 2011 . Sampling is done by plankton net with 300 μm mesh size by method of diagonal traction from bottom to surface in 6 station for a year from winter 2011 to autumn 2012. This research is done based on morphological characteristics, such as overall shape and appendages of larvae in the lab by contrast phase inverted microscope of the first zoea larval stages of species Menaethuis monoceros and second zoea of Menaethiops nodulosus was studied. Larval species density studied at different stations and seasons were calculated. The highest average density respectively with 22/33 and 72/7 individual per m3 in the summer was calculated.