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    Assessment of the effects of COVID-19 lockdown period on groundwater quality of a significant rice land in an urban area of Turkiye
    (Springer Heidelberg, 2022) Tokatli, Cem; Titiz, Ahmet Mirac; Ugurluoglu, Alper; Islam, Md. Saiful; Ustaoglu, Fikret; Islam, Abu Reza Md. Towfiqul
    In the current research, the impact of the COVID-19 lockdown period on groundwater quality of Lower Meric Plain (Thrace Region of Turkiye) was evaluated. Some significant nutrient characteristics (NO3-, NO2-, and PO43-), salinity characteristics (EC, TDS, and salinity), and physical characteristics (temperature, DO, pH, and turbidity) were investigated in groundwater samples collected from 45 sampling points in pre-lockdown and lockdown periods. Water quality index (WQI) and nutrient pollution index (NPI), Pearson correlation index (PCI), cluster analysis (CA), one-way ANOVA test (OWAT), and factor analysis (FA) were applied to assess ecological risk. Excluding recorded statistical differences in temperature and DO due to climatic conditions (p < 0.05), levels of all the investigated water quality parameters show no statistically significant differences and no significant reduction in pollutants measured in the lockdown period. On the contrary, the WQI and NPI scores have increased between the rates of 4.76-27.10% during the lockdown period. In the lockdown period, although the reduction of industry or limited production of many industrial facilities reduced the inorganic contaminant releases to the environment, ongoing agricultural activities and domestic wastes caused to prevent the reduction of organic pollutants in groundwater of the region during the lockdown period.
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    EPIPHYTIC DIATOMS IN ENVIRONMENTAL BIOINDICATION: A CASE STUDY OF A SIGNIFICANT NATURAL LAKE IN THE NORTHWEST OF TURKEY
    (Wydawnictwo Uniwersytetu Rolniczego Hugona Kollataja Krakowie, 2023) Tokatli, Cem; Solak, Cuneyd Nadir; Islam, Abu Reza Md. Towfiqul; Titiz, Ahmet Mirac; Yilmaz, Elif; Atici, Tahir
    Aim of the study The Gala Lake, which has a status of National Park and is a protected area, is the one of the most important natural stagnant water bodies in the Marmara Region of Turkiye. However, it is under effect of a significant agricultural stress, mainly resulting from paddy cultivation of rice. In this research, epiphytic diatoms of Gala Lake were investigated, and trophic status of the lake was assessed by applying the Biological Diatom Index (BDI). Material and methods Epiphytic diatom samples were collected from the submerged macrophytes from 5 selected locations on the lake (G1-G5) with varying ecological character, and observed to be exposed to different pollution pressures. Results and conclusions As a result of collecting taxonomic data, 37 diatom species were recorded by identifying a total of 2095 valves, and Cyclotella meneghiniana, Bacillaria paxillifera, and Navicula recens were found as the most dominant species for the Gala Lake. According to the results of bioindication data, Gala Lake was found to be in a eutrophic state-having poor water quality in terms of applied BDI.