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  • 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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    Simulation of 2003 Bam (Iran) earthquake using empirical Green's function method via very small and near-fault events (2015)
    Oxford University Press
    Details
    Publication Date: 2015-04-04
    Description: The 2003 Bam, Iran, earthquake ( M w  = 6.6) was recorded by the BAM accelerometer station. Since the causative fault was located just below the city, the accelerometer recorded the main shock, a foreshock and several local aftershocks. To study the scenario of rupturing, we simulated all components of the observed main shock waveform via the empirical Green's function method. 28 selected aftershocks and the single foreshock are used to simulate the main shock in the frequency range of 0.5–5 Hz. Since the events were very close to the station, some small events may not have similar path effects to the main shock. Therefore, it is essential to employ some appropriate changes to the waveforms to alleviate path difference effects. The starting point of the rupture is identified in the centre of the strong motion generation area and is located approximately 5 km south of the BAM station and in depth of about 7 km. The horizontal simulated components imply that the main shock was located west of the BAM station. In contrast, significant variation in the ratio of amplitudes in EW and NS components may be used to discuss the possibility of dissimilarity in the focal mechanism of the small events. Most aftershocks with similar mechanisms to the main shock, that is similar EW/NS maximum amplitude ratio, have capacity to simulate certain peaks of their horizontal components. However, some small events with different mechanisms are only able to simulate the peaks of up to one horizontal component. Some changes were applied to the empirical Green's function method to incorporate two small events by using a combined fault model. While the two aftershocks have different mechanisms, some combinations may improve simulations. The rupture initiating point at the middle of the fault plane and improved simulations by combination of two fault surfaces with different focal mechanisms may suggest a bilateral rupture and combination of two focal mechanisms for the main shock of the Bam earthquake.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 3
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    Dietary toxicity of colloidal silver nanoparticles in rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/21989 | 18721 | 2018-01-19 11:23:50 | 21989 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: To evaluate the dietary toxicity of colloidal silver nanoparticles (AgNPs) in rainbow trout, fish were fed with diets containing 0, 20 and 50 mg.kg-1 of AgNPs for 5 weeks and then were fed free nanoparticles diet for a week. During this period, fish growth, as well as silver accumulation and elimination in liver, kidney, gastrointestinal tract and muscle were studied. According to our results, high doses of AgNPs in the fish diet decreased appetite and fish growth. In addition, feeding fish with the diet containing AgNPs (especially at higher doses) increases the accumulation of silver in fish tissues (silver concentration in liver〉 kidney〉 gastrointestinal tract 〉 muscle). Although, a oneweek period considered for elimination of nanoparticles from fish tissues were not enough; however, caused some changes in the accumulation of silver in different organs of the fish. Observed effects due to fish feeding with diets containing silver nanoparticles, suggests that nanoparticle ingestion could affect the fish health. Therefore, preventing the entry of these new materials into the food chain of aquatic organisms seems to be necessary.
    Keywords: Aquaculture ; Biology ; Rainbow trout ; Dietary toxicity ; Aquatic nanotoxicology ; Silver nanoparticles ; Accumulation ; Elimination ; Oncorhynchus mykiss ; Fish ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 23-30
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