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  • Ecology
  • Agriculture
  • 1
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    Distribution and abundance of high aquatic plants in the Gorganroud River, the Caspian Sea basin, Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/21747 | 18721 | 2017-11-30 03:44:45 | 21747 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-30
    Description: The distribution and abundance of high aquatic plants in the Gorganroud River was examined at five stations in four seasons (20 samples) over one year period during 2009-2010. We identified 21 species of aquatic plants from 21 genera, belonging to 9 families. These species were determined as 3 halophytic species (14.2%) and 18 high aquatic plants (85.7%).The highest species diversity was observed at Khajenafas, Aq qala and Chargoli stations(17, 13 and 11 species) respectively, The highest biomass of high aquatic plants were recorded in summer (for Inspection and Chargoli stations 11.5 and 10.1 g.m-2, respectively) and autumn (for the station of Inspection was 8.5 g.m-2 dry weight). The most dominant species were different in the investigated stations. At station 1 species Tamarix kotschyi, at station 2 species Juncus acutiflorus, at station 3 species Hordeum murinum hudson, at station 4 species Salicornia europaea L and at station 5 Juncus acutiflorus species were dominated.
    Keywords: Biology ; Ecology ; Environment ; distribution ; abundance ; aquatic plants ; gorganroud River ; caspian sea basin ; iran ; species ; Tamarix kotschyi ; acutiflorus ; Hordeum murinum Hudson ; Salicornia europaea ; Juncus acutiflorus
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 287-295
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  • 2
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    Determination of heavy metal (Cr, Zn, Cd and Pb) concentrations in water, sediment and benthos of the Gorgan Bay (Golestan province, Iran) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The coastal area of the Caspian Sea and Gorgan Bay are important ecosystems receiving discharge from their tributaries. In this study, concentration of lead (Pb), cadmium (Cd), zinc (Zn) and chromium (Cr) was seasonally determined at 8 sampling points during 2009-2010. Water samples were collected from the sampling stations and transferred to laboratory in polyethylene containers, whereas, sediment and benthic fauna samples were collected using a Van Veen grab. The levels of heavy metals were determined by atomic absorption spectroscopy method. Results showed that range of Pb, Cd, Cr and Zn in the water samples were 80-123, 61-97, 63-87 and 82-120 ppb, respectively and their ranges in the sediment samples were 479-1072, 98-293, 102-622 and 937-1577 ppb, respectively. The range of Pb, Cd, Cr and Zn in the benthos samples were 95-132, 59-110, 26-58 and 103-155 ppb, respectively. Zn and Pb were the most concentrate metals in all samples. Likewise, sediment had the highest heavy metal content amongst the samples. This study demonstrated that the level of metals in the environment is increasing, bringing a serious warning to industries and threat of man-made contamination, which can be restricted and a necessity to control ecosystem and food-chain pollution
    Description: Published
    Keywords: Ecology ; Water ; Heavy metals ; Sediment ; Benthos
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.449-455
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  • 3
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    Investigating distribution and biomass of two species of brown algae (Colpomenia sinuosa and Iyengaria stellata) in coastal waters of Hormozgan Province, southern Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/24151 | 18721 | 2018-08-03 08:20:13 | 24151 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: This study was performed to investigating distribution and biomass of two species of brown algae (Colpomenia sinuosa and Iyengaria stellata) in coastal waters of Hormozgan Province, Southern Iran. We sampled the algae over the years 2001 to 2002 in low tide periods using random 0.5 * 0.5 quadrats along a transect passing through six sampling stations. The highest distribution extent of the two brown algae species during winter and spring seasons observed which coincided with the highest fluctuation in their biomass. The maximum biomass of C. sinuosa in winter and spring was 142 and 75 grams/m2 respectively. For I. stellata, the maximum biomass in the two seasons was 208 and 189 Grams/m2 respectively. Analysis of variance showed a significant difference among the biomass of the two algae species over different months and seasons of the year (p〈0.05). Hence, we concluded that the species occurrence is seasonal and did not find a significant difference in the biomass of the two species obtained from different sampling stations. However, species appearance in different stations occurred in different months with the western stations showing a 1 to 2 months’ time lag compared to that of the eastern stations.
    Keywords: Biology ; Ecology ; Brown Alga ; Colpomenia sinuosa ; Iyengaria stellata ; Hormozgan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 55-64
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  • 4
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    Effect of microbial transglutaminase on gelling properties of kiddi shrimp (Parapenaeopsis stylifera) mince (2021)
    In:  http://aquaticcommons.org/id/eprint/26095 | 18721 | 2018-11-17 18:35:14 | 26095 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: The properties of kiddi shrimp (Parapenaeopsis stylifera) gel added with different levels of microbial transglutaminase (MTGase) (0.6, 1, 1.4 and 1.8 units/g) were studied. Most textural parameters of the gels improved by adding MTGase espacially at higher levels (1.8 and 1.4).The expressible moisture and trichloroacetic acid content declined with the increase in MTGase content. MTGase espacially at higher levels was effective in the color of the gels so that it increased L* and decreased a*andb* value. SDS-PAGE study revealed that myosin heavy chain underwent polymerization to a higher extent in the presence of MTGase. Microstructure of gels added with 1.8 units of MTGase had more ordered fibrillar structure compared with those of gels without MTGase. Therefore it could be concluded that at MTGase play an important role in improving the gel properties of kiddi shrimp mince.
    Keywords: Agriculture ; Iran ; Microbial transglutaminase ; Gel ; Kiddi shrimp ; Mince
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 11-20
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  • 5
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    The density and distribution of the dominant phytoplankton in the southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/23946 | 18721 | 2018-08-01 17:42:25 | 23946 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The research project was comprised of four sampling cruises, which were carried out in summer 94; spring, autumn and winter 95 in the southern part of the Caspian Sea, where Chrysophyta (Diatoms) and Pyrrophyta were found to be the dominant phytoplankton. The maximum density of phylum Chrysophyta (Diatoms) was observed mainly during the autumn in the coast line (below 20 m) and in the central part of the southern Caspian Sea, while the highest density of phylum Pyrrophyta occurred during the spring in the subcoastal zone (below 50 m.). The dominant species in the phylum Chrysophyta (Diatoms) were Rhizosolenia calcar-avis, Thalossionema nitzschiodes, Sceletonema costatum, Cyclotella meneghiniane and three members of genus Coscinodiscus, among which R. calcar-avis had the highest density. Members of phylum Pyrrophyta, i.e. Exuvialla cordata, Prorocentrum scutellum and Glenodinium penardii had the highest density during the spring in the central part of the southern Caspian Sea, where E. cordata was the most abundant.
    Keywords: Biology ; Ecology ; Density ; Distribution ; Dominant ; Phytoplankton ; Chrysophyta ; Diatoms ; Pyrrophyta ; Rhizosolenia calcar - avis ; Thalossionema nitzschiodes ; Sceletonema costatum ; Cyclotella meneghiniane ; Genus ; Exuvialla cordata ; Prorocentrum scutellum ; Glenodinium penardii ; E . cordata ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 95-108
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  • 6
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    Spatiotemporal and estimation of washed out seaweeds biomass in Sistan and Baluchistan coasts (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25525 | 18721 | 2018-10-05 08:33:22 | 25525 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: In order to studing and determination of Seaweed biomass in the Oman Sea coast (Sistan & Baluchestan Province), according to obtained reasults and experiments and observations on seaweed studies in 15 years ego, Beris, Chabahar, Pozm and Tang were high density zones and Jood and Lipar were low density zones in west and east of chabahar respectively that were selected for study stations. Total length of sistan and balochistan coasts from Gwatr area with geografical position 25˚ 10′ N & 61˚ 30′ E to Mydani with geografical position 25˚ 24′ N & 59˚ 5′ E were 354.3 Km. Among this length, 54.6 Km were rocky coast and 299.7 Km were sandy coast. Among this, 18.2 Km were high density zone and 281.5 Km were low density zone. Washout Seaweeds area in intertidial zones determind by measuring and recording of geographic positions by meter and GPS, then were obtained 2 transects determind with equal distance in high density area and 1 transects in low density for monthly sampling. The length of these transects were 100 meter and cross of Each transects were seaweed washed out average. The transects divided to 10 bluck and sampling were done randomly monthly from 5 bluck or 50 persent. The samples were transfered to the lab and the weight of each species was obtained after being cleaned, and separating. The biomass of each species per area unit and in the total area was obtained after determing the average weight of species and also determind geografical position by GPS. In relation to this project were done water sampling for recording of fisical chemistry factors. Total data for analysis recorded in this computer. During this research 9 species were collected. Among these seaweeds, 2 species green algea (composed of 2 families and 2 orders), 6 species brown algae (composed of 3 families and 3 orders) and 1 species red algae were identified. Wet biomass of Sargassum in the total area of Sistan & Baluchestan coasts were 445.9 ton in 2012. Among this biomas, 269.1 ton (%60.35) high density area (Beris 112 ton or %25.11, Pozm 83.7 ton or %18.76, Chabahar 59 ton or %13.22 and Tang 14.5 ton or %3.26) and low density zone 176.8 ton (%39.65). Monthly average were estimated about 74.3 ton (high density zone 44.9 and low density zone 29.5 ton). The maximum biomass was obtained 270.4 ton (high density zone 155.5 and low density zone 114.9 ton) in Azar and minimum biomass was obtained 3.5 ton in Esfand. At last, were suggested, This project were done in persian gulf coasts nessesery.
    Keywords: Biology ; Ecology ; Iran ; Oman Sea ; Sistan and Baluchistan province ; Beris ; Chabahar ; Gwatr ; Seaweed ; Washout ; Biomass ; Density ; Sampling ; Algae ; Green algae ; Brown Algae ; Red algae
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 72
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  • 7
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    Evaluation of effects of physico-chemical factors on chlorophyll-a in Shadegan International Wetland - Khouzestan Province - Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/22872 | 18721 | 2018-05-31 17:54:09 | 22872 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-11
    Description: Measurement of chlorophyll-a can be considered important to investigate the primary production of an ecosystem. This study aimed to investigate chlorophyll-a concentration, primary production and the factors affecting them in Shadegan Wetland located in Khouzestan Province - Iran. Sampling for measuring (NO3, PO4, BOD5, DO, pH, EC, salinity, temperature) was performed seasonally at five sampling stations of the wetland (Canal, Ragbeh, Khoroosi, Mahshahr and Atish), from March 2013 – through February 2014. Results showed that chlorophyll-a concentrations in Canal station were significantly higher than that in the other stations; however, there were no significant differences among the other sampling stations (p〉0.05). The maximum and minimum primary production (and chlorophyll-a) (62, 1.14 mg/m^3) were observed at Canal and Ragbeh stations, respectively. Annual average chlorophyll-a concentration was 10.28 mg/m^3, and there was no significant seasonal difference (p〉0.05). The maximum value of chlorophyll-a was observed in the fall (29.63 mg/m^3), whereas, the minimum value was related to the spring (4.07 mg/m^3). Among the water physicochemical parameters, nitrate had a significant effect on chlorophyll-a concentrations. According to trophic state index (TSI), Shadegan Wetland is mesotrophic in the spring and winter, whereas it is eutrophic in the summer and fall. Overall, the lake is suitable for warm water species.
    Keywords: Ecology ; Environment ; Chlorophyll-a ; Primary production ; Shadegan Wetland ; Trophic state index ; Khouzestan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 360-368
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  • 8
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    Biomass estimation and distribution of Sargassum glaucescens in the Oman Sea (Iranian coastline) (2021)
    In:  http://aquaticcommons.org/id/eprint/24782 | 18721 | 2018-08-06 16:04:55 | 24782 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The brown algae of Sargassum glaucescens is found all along the coastal waters of Sistan and Balouchestan province in the Oman Sea. This species as a raw material can be used in different industries and is considered as an economical marine resources. In order to determine the distribution pattern and biomass of this species eleven growing regions were surveyed from Gwatr area in east and Miedany in west. The sampling were carried out monthly in inter-tidal zone and seasonally in subtidal zone. After sampling, the wet-and dry weight, mean length of taIls and number of branches were measured. Also, some physical and chemical parameters were measured. The results showed that brown algae is distributed all along the studied area in the second half of the year, meanwhile in the Gwatr area is found all seasons. The mean biomass of S. glaucescen,y in Gwatr, Chabahar, Tang and Galak was estimated 629.9, 235.5,314.4 and 127.5 g/m2, respectively.
    Keywords: Biology ; Ecology ; Sargassum glaucescens ; Brown Algae ; Biomass ; Distribution ; Oman Sea ; Sistan and Balouchestan province ; Gwatr ; Chabahar ; Tang ; Galak ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 43-56
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  • 9
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    Correlation between changes of Chlorophyll-a and transparency in the Southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/24832 | 18721 | 2018-07-17 01:32:30 | 24832 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Chlorophyll-a is a main pigment for photosynthetic process in marine phytoplankton and by it either amount of biomass can be estimated or can be considered as an index for trophic level of aquatic ecosystem. In year 1996, 81 secchi disc depth were measured and 1601 samples of chlorophyll-a were collected seasonaly from the southern Caspian Sea. The results showed that average chlorophyll-a in seasonals of spring, summer, autumn and winter were 1.072, 0.550, 1.848, 0.966 mg/m3 and depth of transparency were 6.42, 8.86, 5.62 and 5.22m, respectively. The statistical analysis showed a significant correlation (P〈0.01) between these two parameters in the southern Caspian Sea. More studies are needed to find out higher precise correlation.
    Keywords: Ecology ; Oceanography ; Chlorophyll-a ; Transparency ; Secchi Depth ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 191-200
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