Yazar "Maraslioglu, Faruk" seçeneğine göre listele

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    Comparative Performance of Physicochemical and Diatom-Based Metrics in Assessing the Water Quality of Mert Stream, Turkey
    (Polish Soc Ecological Engineering, 2020) Maraslioglu, Faruk; Bektas, Serdar; Ozen, Arda
    In this study, the authors aimed to compare the performance of the physicochemical-based water quality metrics (WQI, SWQMR) and diatom-based diatom metrics (TDI, BDI, GDI) to evaluate the water quality and ecological status of the Mert Stream. A total of 104 epilithic diatom species, belonging to 44 genera, were recorded during the study period. Navicula was the most dominant diatom in the sites near intensive fanning areas, while Gamphonema was the most dominant species in the sites in vicinity of urban and industrial settlements. According to the water quality indices based on the physicochemical parameters and diatoms, the water quality in the upper and middle parts of the Mert stream was better than in the lower parts (higher amount of total suspended solids and higher conductivity). The structure of the epilithic diatom community was mostly shaped by total suspended solids, electrical conductivity and nutrients according to Canonical Correspondence Analysis results. The obtained results revealed that diatom metrics, especially GDI, and water quality metrics, especially WQI, can be used for the monitoring of lotic systems and provide useful complementary information on the ecological status of rivers in medium rainfall regions such as Samsun.
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    Öğe
    EVALUATION OF ECOLOGICAL CHANGES IN LAKE HAZAR (ELAZIG, TURKEY) USING DIATOM-BASED PALEOLIMNOLOGICAL TECHNIQUES
    (Parlar Scientific Publications (P S P), 2020) Maraslioglu, Faruk; Soylu, Elif Neyran; Avsar, Ulas; Hubert-Ferrari, Aurelia
    Sediment core samples (H002, H003, H005 and H006) recovered from the basin of Lake Hazar located in the South East Region of Turkey. Core samples were collected from the four sampling stations by UWITEC corer to determine diatom flora distribution in Lake Hazar. Diatom counts and identifications were made from the sediments sampled at 1-2 cm intervals. Total of 142 species of diatoms were recorded, most of them were pennate diatoms. Ulnaria ulna, Nitzschia gracilis, Synedra nana, and Cyclotella ocellata dominated the assemblage in the sampling points. Our objective was to investigate the environmental and ecological history of Lake Hazar, and to recover diatom microfossil profils using paleolimnological techniques.
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    Öğe
    Relationship of Epilithic Diatom Communities to Environmental Variables in Yedikir Dam Lake (Amasya, Turkey)
    (Central Fisheries Research Inst, 2017) Maraslioglu, Faruk; Soylu, Elif Neyran
    In order to evaluate the composition and seasonal variations of the epilithic diatoms in Yedikir Dam Lake were studied using samples collected from the stones in the barrier area between November 2004 and April 2006. The diatom communities were diverse; 88 taxa were found, belonging to the Bacillariophyta. Cymbella minuta, Cyclotella ocellata and Encyonema silesiacum have become the most abundant organisms in the epilithon. Environmental variables together with biological data obtained during the monthly routine biomonitoring of epilithic samples in the dam were analysed to understand variability of epilithic diatom communities and their relationships with environmental variables. Moreover, cluster analysis was applied to the epilithic algal communities and the seasonal variations of the samples were classified according to their similarity levels. Speciess richness and shannon diversity of the samples which were counted were measured in monthly periods. The results of the diversity analysis and the counting did not exactly match up with each other. Multivariate analyses indicated that both the regional distribution and seasonal variation of some epilithic diatoms (e.g. Cymbella spp., Nitzschia spp., Amphora delicatissima) are mainly driven by nutrient concentrations. Furthermore, epilithic diatoms are predominantly affected by geochemical characteristics including pH and total alkalinity (CaCO3) levels.