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    A case study performed in Kucukcekmece Lagoon channel/Istanbul, Turkey: how the heavy metal contamination and the seasonal variations on phytoplankton composition influence water quality
    (Desalination Publ, 2021) Yilmaz, Nese; Ozyigit, Ibrahim Ilker; Dogan, Ilhan; Demir, Goksel; Yalcin, Ibrahim Ertugrul
    In this work, the experiments related to seasonal variations of phytoplankton composition and heavy metal contamination along with some water quality parameters were carried out throughout the channel, serving as a waterway between Lake Kucukcekmece and the Sea of Marmara. Considered as a Class B wetland, the lake has been stayed within the metropolitan area of Istanbul overtime. The samples from the surface water were taken monthly by using Nansen bottles at 5 sampling sites through the period of March-November. After experimental procedures, a total of 46 taxa were recorded belonging to Bacillariophyta (20), Charophyta (4), Chlorophyta (6), Cryptophyta (1), Cyanobacteria (4), Euglenozoa (3), and Miozoa (8) divisions. The phytoplankton densities were found to be varied from 76 individual cm' to 3,283 individual cm(-3) throughout the channel and the variation for chlorophyll-a contents was between 0.99-55.32 mg m(3) . From our results, the heavy metal and nutrient concentrations were found to be as: 0.78-1.55 mg L-1 for Al, 4.2813.88 mg L-1 for B, 1,201-1,693 mg L-1 for Ca, 45.20-120.40 mu g L(-1 )for Cd, 432.40-1,398.40 mu g L-1 for Cr, 232.00-1,043.00 mu g L-1 for Cu, 663.40-2,315.60 mu g L-1 for Fe, 626.20-1,435.20 mg L-1 for K, 738.001,113.00 mg L-1 for Mg, 1,882-6,084 mg L-1 for Na, 30.00-317.80 mu g L-1 for Ni, 17.40-158.00 mu g L-1 for Pb, and 440.20-1,186.20 mu g L-1 for Zn. According to the data obtained in this study, the area where research conducted was determined as having eutrophic characteristics.
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    Öğe
    AN ECOLOGICAL STUDY OF ENDEMIC PLANT POLYGONUM ISTANBULICUM KESKIN AND ITS ENVIRONS
    (Pakistan Botanical Soc, 2013) Altay, Volkan; Ozyigit, Ibrahim Ilker; Keskin, Mustafa; Demir, Goksel; Yalcin, Ibrahim Ertugrul
    In this study, some ecological features of narrow endemic Polygonum istanbulicum Keskin, which was established as a new plant species in 2009, and its environs were examined. There are 41 known Polygonum taxa in Turkey and the genus is represented by 14 species in Istanbul. Plant and soil samples were collected from the place where the species merely lives in the world (Basibuyuk Forest, Maltepe District, Istanbul/Turkey). Plant and soil samples were collected by using standard methods and root, branch, leaf and soil mineral nutrients (Ca, Cu, K, Mg, Mn, N, P, Na, Zn), were measured. Additionally, soil texture, structure and other physical and chemical measurements such as pH, total protein and electrical conductivity (EC) were determined.
  • [ N/A ]
    Öğe
    An ecological study of endemic plant Polygonum istanbulicum Keskin and its environs
    (2013) Altay, Volkan; Ozyigit, Ibrahim Ilker; Keskin, Mustafa; Demir, Goksel; Yalcin, Ibrahim Ertugrul
    In this study, some ecological features of narrow endemic Polygonum istanbulicum Keskin, which was established as a new plant species in 2009, and its environs were examined. There are 41 known Polygonum taxa in Turkey and the genus is represented by 14 species in Istanbul. Plant and soil samples were collected from the place where the species merely lives in the world (Başi{dotless}büyük Forest, Maltepe District, Istanbul/Turkey). Plant and soil samples were collected by using standard methods and root, branch, leaf and soil mineral nutrients (Ca, Cu, K, Mg, Mn, N, P, Na, Zn), were measured. Additionally, soil texture, structure and other physical and chemical measurements such as pH, total protein and electrical conductivity (EC) were determined.