Recursos de colección

Aquatic Commons (38.811 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Subject = Environment

Mostrando recursos 1 - 10 de 10

  1. Puerto Rico: Hurricane Maria, mortal embrace

    Toro, María Suárez
    Conflicting forces of nature, alongside the ecological intervention of traditional fishermen, helped mitigate the destruction wrought in Puerto Rico by Hurricane María

  2. Impact of Atlantic salmon cage culture on sediment chemistry in Mjoifjordur, Iceland

    Shakouri, M.; Auðunsson, G.A.
    Impact of Atlantic salmon (Salmo salar) cage culture in Mjoifjordur, Eastern Iceland on the chemistry of the sediment was investigated. Sediment samples were collected using a Shipek grab in December 2003. A core sub-sample was taken from each grab for analyzing total organic matter, total organic carbon, total nitrogen and phosphorus in different depths from three stations at various distances from the cage. These parameters were analyzed in the top layer of additional four stations. The results showed significant increase in all analyzed parameters in station 1, at 5m from the cage (p<0.05). The difference between reference station (600 m...

  3. Kepadatan kerang lumpur Anodontia edentula Linnaeus, 1758 kaitannya dengan parameter lingkungan di Kabupaten Muna

    Rochmady, R; Omar, Sharifuddin Bin Andy; Tandipayuk, Lodewyck S.
    The research aims to analyze the density of mud clams Anodintia edentula Linnaeus, 1758 relation to environmental parameters, covering organic material content and composition of sediment in Muna regency. Research carried out in coastal Lambiku and Tobea Island. The sample collection begins in March until May 2011, intervals collection example once a month for three months. A collection of mud clams example in a plot trasek (Line Transect Plot) is determined (purposive sampling). A plot observation based on three categories, Plot I near coast, Plot II the transition and Plot III far from the beach, intervals 50m each a plot...

  4. Water quality of Bodo Creek in the lower Niger Delta basin

    Zabbey, N.; Onwugbuta-enyi, J.; Erondu, E.S.
    The dynamics of some physicochemical parameters of Bodo Creek on the upper reaches of theAndoni-Bonny river system were studied between December 2005 and July 2006. There were significant differences (P<0.05) in Secchi Disc Transparency and salinity, while temperature, Dissolved Oxygen (DO), Biological Oxygen Demand(BOD), phosphate and nitrate concentrations were 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 were obvious seasonal flux in the ecological variables (P<0.05), except nitrate concentrations that were not statistically significant (P>0.05). The usefulnessof the results...

  5. Water quality assessment of the Zayandehroud Lake using WQI index

    Khalaji, M.; Ebrahimi, E.; Hashemenejad, H.; Motaghe, E.; Asadola, S.
    Biological and ecological studies of water resources play an important role in both researches and scientific studies. The most important step for this study is identifying the characteristics of the ecosystem, living organisms and environmental factors. In recent years, Water quality evaluation, especially drinkable water, became both important and essential for reduction in quality and quantity of them. Lakes and ponds always being under attention as the most important resources for drinking and agricultural purposes. To improve efficiency of uses of the water resources, we need appropriate methods to determine quality of them. Investigate the quality of the Zayandeh roud...

  6. Study on changes of biotic and abiotic parameters, and other biological indices in Shahid Rajaei Reservoir using mono and multivariate statistical analysis

    Nasrollahzadeh Saravi, H.; Makhlough, A.; Vahedi, F.; Rezaei, M.
    The Shahid Rajaei Reservoir constructed for various purposes such as drinking water supply. In this context, and also because of the importance of the bloom events and eutrophication process in dams, this paper is to survey the relations between some of physicochemical parameters and phytoplankton composition and density, chlorophyll-a and some water quality indices (Trophic, Saproby, Shannon) using mono and multivariate statistical analysis. Water samples collected from 4 stations during May, June, July, August, September, November and February in 2012-2013. According to the results, the maximum concentration of dissolved inorganic nitrogen, chlorophyll-a, phytoplankton abundance, trophic and saproby indices observed in...

  7. Effect of malathion insecticide on liver tissue and enzymes of Rutilus rutilus caspicus of the Caspian Sea

    Farrokhi, F.; Jamili, Sh.; Shahidi, M.; Mashinchian, A.; Vosoughi, Gh.
    Malathion is an organophosphate insecticide which uses to destroy insects and pests of fruit trees, ornamental plants and agricultural corps. In the present study, effect of Malathion on liver and selected enzymes (SGOT, SGPT and ALP) was studied in Caspian Roach (Rutilus rutilus caspicus). Four treatments with three replications were designed to carry out the survey. Four groups of experimental fish (containing 30 fish in each group) were exposed to different concentrations of Malathion. e. 0, 0.01, 0.05 and 0.1 ppm respectively for 23 days. Blood collection was done in 3rd, 13th and 23th after exposure to Malathion and also...

  8. Evaluating the potential of a bivalve species from the intertidal zone of the Persian Gulf for biomonitoring of trace elements using a nondestructive analytical method

    Pourang, N.; Ghanbari Baghestani, F.; Lamei Rashti, M.; Mrotazavi, M.S.; Kamali, E.; Varasteh, T.
    This study was carried out in order to evaluate the potential of the soft and hard tissues of a bivalve species (Callista umbonella) for biomonitoring of different elements in coastal areas of northern part of the Persian Gulf as well as to assess the possible use of PIXE (Proton Induced X-ray Emission) method in this regard. The bivalve specimens and surficial sediment samples were collected from three sampling sites located on the intertidal zone of Hormozgan Province in August 2014. Concentrations of the elements were determined using the non-destructive method, PIXE. Assessment of total organic matter (TOM) and grain size...

  9. Cytotoxic activity of natural components soluble in methanol and diethyl ether of Dysidea pallescens from Hengam Island, Persian Gulf

    Nazemi, M.; Moradi, Y.; Sadrian, M.; Lekzaee, F.
    Sponges are the most primitive of the multicellular, These organisms don’t have any mechanical defense system, so their early appearance in evolution has given them a lot of time for the development of advanced secondary metabolites as chemical defense system. Sponges have the potential to provide drugs from chemical components against diseases. In this investigation the sponge samples, which it is Dysidea pallescens, were collected at depth of 15- 20 meter, from locations on the coastline of Island Hengam in Persian Gulf of Iran. For identifying natural components, methanol and diethyl ether were used as extraction solvents, after removal of...

  10. Investigation and determination of marine biotoxins in the shellfish of Persian Gulf and Oman Sea

    Mortazavi, M.S.; Aramideh, A.; Mohebbi, L.
    Marine algal toxins have drawn worldwide attention because of their involvement in human intoxication and the socio-economic impacts. Marine biotoxins have been produced by harmful bloom algae, known as dinoflagellate. In the present study, two groups of toxins, i.e. PSP, ASP analyzed in the muscle of shellfish caught from the north parts of the Persian Gulf (Bandar Abbas, Bandar Lengeh, Boushehr) and Oman Sea (Chabahar). Sample preparation and extraction were done according to AOAC methods and by ELISA. PSP amounts in the shellfish samples ranged from ND-3.962 and ND-1.477 mg/g muscle. The results showed all samples were safe.

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