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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, AureliaSediment 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.Öğe New diatom records for Turkish freshwater algal flora from Lakes Ladik (Samsun, Turkey) and Hazar (Elazığ, Turkey)(Central Fisheries Research Inst, 2018-03) Maraşlıoğlu, Faruk; Soylu, Elif NeyranThe majority of phycological studies in Turkey focus on seasonal changes of phytoplankton and phytobenthos in lentic and lotic systems, while very few studies related to counting diatoms in sediment cores obtained as a result of paleolimnological work have been published. In this paleolimlogical study, seventeen (14+3) n e w diatom records for freshwater algal flora of Turkey were determined on sediment core samples at five different locations collected in July 2006 from Lakes Ladik (Samsun) and Hazar (Elazığ). We recorded seventeen diatom taxa belonging to Naviculales (8), Cymbellales (2), Eunotiales (2), Bacillariales (2), Fragilariales (1), Tabellariales (1) and Aulacoseirales (1) orders from Lakes Ladik (Samsun) and Hazar (Elazığ). All of the reported taxa are new records for freshwater algal flora of Turkey. General information on the morphology and taxonomy of the species are briefly described in this paper, with their illustrations.Öğe Relationship of Epilithic Diatom Communities to Environmental Variables in Yedikir Dam Lake (Amasya, Turkey)(Central Fisheries Research Inst, 2017) Maraslioglu, Faruk; Soylu, Elif NeyranIn 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.Öğe Seasonal and spatial variation of epilithic algal community in Batlama Stream (Giresun, Turkey)(Hitit University, 2017) Maraşlıoğlu, Faruk; Soylu, Elif Neyran; Altürk Karaca, SibelSpatio-temporal changes in taxonomic composition and structure of epilithic algal community with some physicochemical features of the Batlama stream were assessed between June 2013 and May 2014 at the intertidal zone of the Batlama Stream, Giresun, Turkey. A total of 90 taxa were identified belonging to division of Bacillariophyta (80 taxa), Euglenophyta (3 taxa), Cyanobacteria (3 taxa) , Charophyta (2 taxa) and Chlorophyta (2 taxa) on epilitihic algae of Batlama Stream. Encyonema minutum, Ulnaria ulna, Cocconeis placentula, and Navicula cryptocephala species were the most abundant taxa among all samples of the four stations throughout the study. The Shannon diversity index (H’) values varied in the range from 0.5 to 1.2 and correlated with both species richness and relative species abundance (evenness). The results of the diversity analysis and the counting did not exactly match up with each other. Chlorophyll-a values of the stream and trophic classification (TDI, BDI) based on epilithic diatoms ascribed Batlama Stream to the mezotrophic range. Also, according to the calculated pollution index (PTI, S) values, all stations of the Batlama Stream were moderately polluted (?-mesosaprobity).Öğe Seasonal succession of the phytoplankton community and evaluation of water quality using trophic diatom index in a stream(Scibulcom Ltd., 2016) Maraşlıoğlu, Faruk; Soylu, Elif Neyran; Aksoy, ArifPhytoplankton species composition, seasonal variation and the factors effecting the variation were studied in this study one-year period, from June 2010 to May 2011. Water samples were collected monthly from four stations. Algae of the stream was determined by the enumaration and identification of the collected samples. A total of 53 phytoplankton taxa were determined, consisting of Bacillariophyta (79%), Chlorophyta (9%), Cyanobacteria (6%), Euglenozoa (4%) and Cryptophyta (2%). Bacillariophyta dominated mostly in species variety. Diatoms are commonly used as biloindicator organisms for evaluating especially freshwater quality. Trophic diaton index (TDI) provides information about trophic levels of the aquatic ecosystem. The water quality of Buyuk Gure Stream in terms of trophic levels was determined according to these 42 diatom taxa by calculating TDI. It was determined that Buyuk Gure Stream has eutrophic state, caused by organic pollution, according to TDI. Ankistrodesmus falcatus was dominant species in June. Total organism numbers reached its highest level in July during the study period. The number of species and diversity of phytoplankton showed seasonal variation, being low in rainy season. Rainfall, light and temperature are expected to be the major factors which influence phytoplankton succession and dominance. © 2016, Scibulcom Ltd. All rights reserved.Öğe Seasonal variation and occurrence of algal turf community in Lake Ladik, Turkey(2013) Maraşlıoğlu, Faruk; Soylu, Elif Neyran; Gönülol, ArifThe composition and seasonal variation of the algal turf of Lake Ladik were studied using samples collected from one station between June 2000 and May 2001. 50 tax^jfJriatoms were identified in the epiphyton. Navicula veneta, N. halophila, Nitzschia fonticola and Aulacoseira distans were particularly important on turf community. During the October month several Navicula species become progressively more important. Gomphonema lateripunctatum was particularly notable. Other diatoms were occasionally abundant, including Cymbella affinis, C. silesiaca, Navicula cryptocephala, Gomphonema olivaceum and Cyclotella ocellata. Also Navicula lanceolata and Anomoeoneis brachysira were conspicuous, owing to their large size, but were never numerically abundant. Fragilaria ulna and Nitzschia palea were found in low numbers in study area and this pointed out there has not been a remarkable abundance of algal pollution in Lake Ladik. The associations between July and August with bonds to June, January and February with bonds to April were most significant in the study period obtained by cluster analysis. Shannon diversity and evenness presented small variations during tjf studfcperiod. Lake Ladik presented low values of species richness particularly during summer period and highest values were recorded in April. According to canonical correspondence analysis, there was association between some Navicula and Nitzschia species with P04, NH3-N. Also the multivariate analysis showed, temperature as the most important factor in the distribution and abundance of diatoms on turf biomass. © Triveni Enterprises, Lucknow (India).Öğe Water quality assessment of the Pazarsuyu Stream based on epilithic diatom communities(E. Schweizerbart'sche Verlagsbuchhandlung, 2017) Temizel, Bengü; Soylu, Elif Neyran; Maraşlıoğlu, FarukThe trophic diatom index (TDI) and the biological diatom index (BDI) provide information about the trophic levels in the aquatic ecosystem. The pollution tolerance index (PTI) and saprobic index (SI) use diatoms to assess the health of aquatic ecosystems. We collected epilithic diatoms from the Pazarsuyu Stream located in the Turkish province of Giresun between June 2014 and May 2015 to assess the water quality using the four types of diatom indices which consist of BDI, TDI, PTI, SI. A total of 49 taxa were identified as belonging to the class of Bacillariophyceae. The reference site affected by domestic waste contained Ulnaria ulna (Nitzsch) Compère, Navicula radiosa Kützing and Encyonema minutum (Hilse) D. G. Mann. The water quality of the site had average BDI values ranging between 14.2 and 14.5 and average TDI values between 50 and 54.7, both of which indicate the existence of a mesotrophic environment. However, according to the value of the SI, the studied site was moderately polluted (?-mesosaprobity), whereas PTI values showed that the site was heavily polluted (?-mesosaprobic).
