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  • Environment  (1,190)
  • Sociology  (573)
  • 2020-2022  (1,719)
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  • 1
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    Defining the Present Before Restoring the Past: Everglades Vegetation Communities (2021)
    In:  http://aquaticcommons.org/id/eprint/4674 | 3 | 2011-09-29 16:06:07 | 4674 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: A publication of the Society of Wetland Scientists
    Keywords: Conservation ; Environment ; Planning ; Everglades ; vegetation ; restoration
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-4
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  • 2
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    Multi-state succession in wetlands: a novel use of state and transition models (2021)
    In:  http://aquaticcommons.org/id/eprint/4672 | 3 | 2011-09-29 16:06:09 | 4672 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Keywords: Ecology ; Environment ; Limnology ; Management ; alternate stable states ; CART ; Florida Everglades ; USA ; state and transition models ; succession ; VDDT ; wetlands ; Vegetation Dynamics Development Tool
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1900-1909
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  • 3
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    Benthic fauna and water quality in Gorganrood River, Iran (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Fisheries
    In:  http://aquaticcommons.org/id/eprint/19181 | 17408 | 2016-02-08 10:24:10 | 19181 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-13
    Description: This present work study on water quality and benthic Macro invertebrate in Gorganrood, river. The research was carried out at 6 sampling site and the abundance and diversity of benthos were monitored along the length of river between 2007_2008_14 families were recorded in phyla, namely Annelidae, Mollusca,....The greatest number of species was at 1 st station and the least number was at 6th station. The upper section supported more diverse community then the lower section.A low macro invertebrate abundance was observed during spring as a result of heavy rainfall and flood, and generally in all lowest section because of high valve of nitrogen and other nutrients.Water physiochemical parameters such as Phosphate, Nitrate,TPS and others were measured and water quality were studied through different indices such as saprobic system, Helsinhoff (FBI), BMWP and the results were compared and evaluated by physical chemical and parameters. The result indicated that the water quality in the up stream and the middle were good to fair, but the down stream qualities were pour at all sites.
    Description: PhD
    Description: Advisors: Behruz Dehzad Counsellors: Amin Keyvan, GH. Vosoughi. The full text document is in Farsi only so it has not been possible for AC Editors to check the metadata input.
    Keywords: Biology ; Ecology ; Environment
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 104
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  • 4
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    Biota-sediment accumulation factor and concentration of heavy metals (Hg, Cd, As, Ni, Pb and Cu) in sediments and tissues of Chiton lamyi (Mollusca: Polyplacophora: Chitonidae) in Chabahar Bay, Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/23147 | 18721 | 2018-06-18 20:31:22 | 23147 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-13
    Description: Heavy metals and some organic substances which are drained into the aquatic environments and cannot be decomposed or eliminated will sink into sediments or find their way into different levels of food chain. Bioaccumulation is the process of continuous deposition and aggregation of these substances into the body tissue of living organisms. Mollusks are remarkably appropriate to be used as bio-indicators because of their motionless or almost sessile nature, relatively high abundance, selective absorption of certain ions, and worldwide distribution in marine and inland aquatic habitats. Chiton lamyi is a sedentary species from the phylum, Polyplacophora, which is usually abundant on the rocky shores and intertidal zone of marine environments. Sediment and Chiton samples were taken from four stations of Chabahar Bay in autumn 2013. After acid digestion of samples, the concentration of heavy metals (mercury, cadmium, arsenic, nickel, lead and copper) were measured by the graphite furnace atomic absorption apparatus, and the bioaccumulation factor in relation to sediment was calculated. The highest concentration value was calculated as 3.28 for cadmium in the Hafte Tir station. The results of this study indicated that chitons can be used as an appropriate bio-indicator for heavy metals particularly cadmium pollution in the marine environment.
    Keywords: Biology ; Chemistry ; Environment ; Pollution ; Biota-sediment accumulation factor ; Heavy metals ; Bioaccumulation ; Bio-indicator ; Mollusks ; Chabahar Bay ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1123-1134
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  • 5
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    A study of the problems associated with Dalangdian reservoir, China (2021)
    In:  http://aquaticcommons.org/id/eprint/4684 | 1256 | 2011-09-29 16:05:30 | 4684 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-05
    Description: There are over 2,300 lakes over 1 km2 in China (total area 80 000 km2). In addition there are approximately 87 000 reservoirs with a storage capacity of 413 billion m3. These form the main supply of drinking water as well as water for industrial and agricultural production and aquaculture. Because of a lack of understanding of the frailty of lake ecosystems and poor environmental awareness, human activities have greatly affected freshwater systems. This article focuses on the problems of one water supply reservoir, Dalangdian Reservoir, and considers options for improving its management. Dalangdian Reservoir is described and occurrence of algal genera given. The authors conclude with remarks on the future of the Dalangdian Reservoir.
    Keywords: Environment ; Limnology ; Management ; Water reservoirs ; Eutrophication ; Water supply ; Phosphorus ; China ; Dalangdian Reservoir
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 28-37
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  • 6
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    Geopolitics and environmental issues in the Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21687 | 17408 | 2017-11-27 10:58:47 | 21687 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-28
    Description: Nowadays, a noticeable part of the relations among the states turn around the environment protection. Therefore, the right for ever-creasing use of the existing resources of this inland sea cannot be exclusive to any Caspian State and the aftermath involves all countries of this basin. In this respect, agreement on political border and boundaries with the Caspian Sea’s ecosystem is a difficult issue. The unstable resources of fish reserves, underground oil pools, migratory animals and instability of resources that so often seem to be harmful, particularly for their potential power of passing through borders, are the subject of geopolitical disputes among the states of this basin. According to the above-mentioned points, the basic question in the present article is: “What is the role of the environmental issues in geopolitical relations of the Caspian States?” Therefore, it is supposed that a consideration of environmental issues in exploiting different resources of the Caspian Sea can set up peace among the Caspian countries.
    Keywords: Environment ; Policies ; Pollution ; Geopolitics ; Environmental issues ; Caspian Sea
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 113-121
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  • 7
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    Fish assemblages as influenced by environmental factors in Taleghan River (the Caspian Sea basin, Alborz Province, Iran) (2021)
    In:  http://aquaticcommons.org/id/eprint/21764 | 18721 | 2017-11-30 07:05:00 | 21764 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-07-01
    Description: The relationship between some habitat factors and fish assemblage was analyzed in the Taleghan River, Alborz Province, Iran. Fish specimens from thirty-three sites were sampled by electrofishing device in October 2014. The habitat parameters, including elevation (m), water depth (cm), river width (m), river slope (%), current velocity (m.s -1), number of large stone (〉 15 cm), average stone diameter (cm), substrate index (SI%), level of potamal cover, level of periphyton cover, pH, electrical conductivity, total dissolved solid and temperature (°C) were measured in all sampling sites. Canonical correspondence analysis was performed to study the relationship between fish assemblage and environmental factors. The results showed that the fish assemblages of the Taleghan River are organized by the environmental variables. Based on the results, the abundance of C. gracilis did not show any distinctive relationship with examined habitat variables, whereas the presence and abundance of B. cyri showed a rise with increasing substrate index and bed stone diameter and a decline with increasing river width and flow velocity. The presence and abundance of O. bergianus rises with the increasing current velocity and river width and showed a decline with increasing slope, depth and substrate index. The results of this study provides insights into the ecology of fishes in the Taleghan River and can help an effective fisheries management of other rivers of the Caspian Sea basin.
    Keywords: Biology ; Environment ; Fisheries ; fish ; assemblages ; influenced ; environmental ; taleghan river ; caspian sea ; alborz province ; iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 363-371
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  • 8
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    Efecto de la radiación ultravioleta sobre los ecosistemas acuáticos (2021)
    In:  http://aquaticcommons.org/id/eprint/16701 | 9602 | 2016-05-04 14:16:51 | 16701 | Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
    Details
    Publication Date: 2021-07-08
    Description: Hasta hace poco tiempo se consideraba que la radiación ultravioleta carecía de importancia como factor ambiental en los ecosistemas acuáticos, ya que se suponía que se absorbía totalmente en los primeros centímetros de la columna de agua. Gracias al desarrollo de mejores instrumentos de medición, hoy se sabe que la penetración de la radiación ultravioleta en el agua es mucho mayor que la estimada anteriormente, y que sus efectos biológicos resultan observables hasta decenas de metros de profundidad. Este artículo de divulgación científica incluye, además de lecturas sugeridas, información del ozono estratosférico y troposférico, y sobre factores que afectan la intensidad de la radiación ultravioleta que llega a la superficie terrestre.
    Description: Reprinted as: pp.41-47 in, Ciencia del Mar. Volumen temático 1, 12/2014; Asociación Ciencia Hoy. ISBN: 978-987-45584-0-4 (Special issue dedicated to 'Marine Sciences: 1988-2014')
    Keywords: Biology ; Conservation ; Ecology ; Environment ; Pollution ; PSW ; Argentina ; freshwater environment ; marine environment ; ultraviolet radiation ; ozone ; ecosystems
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 22-29
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  • 9
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    Water quality of Bodo Creek in the lower Niger Delta basin (2021)
    In:  http://aquaticcommons.org/id/eprint/22475 | 19325 | 2018-02-22 14:59:59 | 22475 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-06
    Description: The dynamics of some physicochemical parameters of Bodo Creek on the upper reaches oftheAndoni-Bonny river system were studied between December 2005 and July 2006. There weresignificant differences (P〈0.05) in Secchi Disc Transparency and salinity, while temperature,Dissolved Oxygen (DO), Biological Oxygen Demand(BOD), phosphate and nitrate concentrationswere similar (P〉0.05) between the spatial grids. The values recorded ranged from 26.7 to 30.1°C(Temperature);73-157 cm (Secchi Disc Transperancy); 6.2-22.7%0 (Salinity); 4.6-11.8 mgtl (DO);0.7-8.2 mgtl (BOD); 0.047-2.300 mgtl (Phosphate) and 0.013 to 0.873 mgtl (nitrate). There wereobvious seasonal flux in the ecological variables (P〈0.05), except nitrate concentrations that werenot statistically significant (P〉0.05). The usefulnessof the results infuture monitoring and possiblereasons for the observed environmental gradients are discussed.
    Keywords: Aquaculture ; Environment ; Fisheries
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 28-33
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  • 10
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    Determination of ecological sensitive areas of the coastal areas of Caspian Sea (Boujagh Wetland National Park) based on ecological carrying capacity and economical valuation region (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Environmental Science
    In:  http://aquaticcommons.org/id/eprint/20902 | 17408 | 2016-07-18 02:40:57 | 20902 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-13
    Description: The coastal districts, as an intersection of two perfectly different ecosystems of dry land and sea, is one of the most complicated and the richest natural system on earth. Considering these areas are constantly exposed to aggregation of water pollutants and also consequence resulting from construction and development activities, they are very vulnerable. Therefore, "sensitive Coastal areas" has become a common word in the related subjects to marine environment recently. The said title relates to the areas of the coastal lines which are vulnerable to the natural condition or human actions because of ecological, social, economic, educational and research importance, also they need particular supports. The southern coasts of Caspian Sea, In Iran prominent samples are of these sensitive areas which their environment are exposed to demolition and destruction intensely, due to increasing and uncontrolled development. The first stage of protecting and managing the coastal areas is identifying sensitive Coastal areas and broadening the Coasts. In this survey, we attempted to examine a definite area in the southern coasts of Caspian Sea. In Iran, by profiting from the world experiences and concluded researches in Iran especially the concluded studies by marine environment office and the Environment protection organization on the subject of determination criteria of the sensitive ecological districts. For this purpose (In Gilan Province) Boujagh national park district which is located in the mouth of sefidroud river and also is possessed of the special ecological and environmental features and distinctions. In this survey, first they said district is divided proportionally on the basis of using a grid system in order to identify the sensitive ecological districts and broaden the coast, and then the desired indices have been determined and scored by numeral valuation method in each unit and then analysis has been done by using of the geography information system (GIS) and final has estimated economic valuation of sensitive ecological areas that is presented in this essay.
    Description: PhD
    Description: Advisors: Majid, Abaspour; Parvin, Farshchi; Counsellors: Mahmud, Mahmudi; Hamid, Dehim
    Keywords: Ecology ; Environment
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 271
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