New Records For the Turkish Freshwater Algal Flora in Twenty Five River Basins of Turkey, Part Vi: Charophyta

DergiPark: 875740trkjnatAlthough planktonic algae are a basic component of freshwater ecosystems, studies on their diversity and species distribution are still not in satisfactory numbers. This study aims to contribute to Turkish freshwater algal flora particularly with the new records reported. A total of 158 Charophyta taxa were determined in the study conducted from 2017 to 2019 in 25 river basins of Turkey. In this study, while the highest Charophyta taxon was found in Sakarya and Batı Akdeniz basins with 50 and 42 taxa, respectively, Burdur basin was the only basin where we did not find the Charophyta species. The highest Charophyta diversity was observed in Girdev Lake (Batı Akdeniz basin) and Işık Dağı Karagöl Lake (Sakarya basin) among the lakes of Turkey’s 25 river basins. Thirty-one of these Charophyta taxa represent new records for the freshwater algal flora of Turkey. Of these, 13 species are commonly distributed, while 18 species have rare distribution areas. Morphology, ecology, and distribution of each taxon were also discussed in details.Planktonik algler tatlı su ekosistemlerinin temel bir bileşeni olmasına rağmen, onların çeşitliliği ve tür dağılımları konusundaki çalışmalar hala tatmin edici sayılarda değildir. Bu çalışma, özellikle raporlanan yeni kayıtlarla Türkiye tatlı su alg florasına katkıda bulunmayı amaçlamaktadır. 2017-2019 yılları arasında Türkiye'nin 25 nehir havzasında yapılan bu çalışmada toplam 158 Charophyta taksonu tespit edilmiştir. Bu çalışmada, en yüksek Charophyta taksonuna sırasıyla 50 ve 42 takson sayısıyla Sakarya ve Batı Akdeniz havzalarında rastlanırken, Charophyta türüne rastlamadığımız tek havza Burdur olmuştur. Türkiye'nin 25 akarsu havzasındaki göller arasında en fazla Charophyta çeşitliliği Girdev Gölü (Batı Akdeniz havzası) ve Işık Dağı Karagöl (Sakarya havzası)’de görülmüştür. Tespit edilen bu Charophyta taksonlarının 31’i Türkiye'deki tatlısu alg florası için yeni kayıt niteliğindedir. Bunlardan 13 tür yayılış alanı olarak yaygın iken, 18 tür nadir yayılış alanına sahiptir. Her bir taksonun morfolojisi, ekolojisi ve dağılımı da ayrıntılı olarak verilmiştir

Chlorococcal chlorophyte composition, community structure, and seasonal variations in the shallow lakes of the Kizilirmak Delta, Turkey

WOS: 000288187800014The chlorococcal chlorophyte community structure and seasonal variations in terms of species composition and abundance of dominant species in Tatli, Gici, Liman, and Cernek lakes (Samsun, Turkey) were investigated between 1996 and 2003. Species richness and diversity (Shannon-Weaver, H') were measured monthly from stations at the surface of each lake. Changes in the Chlorococcales community structure were examined with nonmetric multidimensional scaling (NMDS) ordinations. A total of 36 Chlorococcales species were identified in these lakes located in the Kizilirmak Delta. While the Chlorococcales composition was similar in Tatli, Gici, and Liman lakes, Cernek Lake showed different seasonal trends, indicating high species richness. Ankistrodesmus falcatus and Kirchneriella obesa were important in terms of their contribution to the total Chlorococcales present in Tatli, Gici, and Liman lakes, and Monoraphidium irregulare had high concentrations among the Chlorococcales in Cernek Lake. There were clear increases in the species richness of Monoraphidium and Ankistrodesmus in all lakes during winter compared with other seasons.Scientific Research Foundation of Ondokuz Mayis UniversityOndokuz Mayis University [F212]This study was supported by the Scientific Research Foundation of Ondokuz Mayis University (Project No: F212). The authors would like to thank Beyhan TAS for sharing the data from Cernek Lake and for contributions to the manuscript

Water quality assessment of the Pazarsuyu Stream based on epilithic diatom communities

WOS: 000412040000003The 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) Compere, Navicula radiosa Kutzing and Encyonerna niinuturn (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 (beta-mesosaprobity), whereas PTI values showed that the site was heavily polluted (alpha-mesosaprobic).Scientific Research Project Coordination Unit of Giresun University [FEN-BAP-C-250414-19]This study was supported by Scientific Research Project Coordination Unit of Giresun University, Project Number: FEN-BAP-C-250414-19

Epiphytic Diatom Flora of Liman Lake (Bafra-Samsun)

Liman Gölü epifitik diatome florasını belirlemek amacıyla gölden aylık peryotlarla Ocak 2001-Kasım 2001 tarihleri arasında Potamogeton perfoliatus Linnaeus ve Mart 2001-Mayıs 2001 tarihleri arasında Potamogeton pectinatus Linnaeus üzerinden örnekler alınmıştır. Araştırma alanında epifitik diatome florasına ait P. perfoliatus üzerinde 30 takson, P. pectinatus üzerinde ise 23 takson tespit edilmiştir. Epifitik algler içerisinde Navicula gregaria, N. rhyncocephala, N. radiosa, Ulnaria ulna, Cymbella ventricosa ve Diatoma vulgaris önemli olmuşlardır. P. pectinatus diğer bitki türlerinden daha düşük epifiton yoğunluğu ve yüksek Cocconeisplacentula bolluğu ile ayırt edilmektedir.The samples were taken monthly from the lake between January 2001- November 2001 from the surface of Potamogeton perfoliatus Linnaeus, between March 2001-May 2001 from Potamogeton pectinatus Linnaeus to determine the epiphytic diatom flora. There have been 30 taxa on P. perfoliatus, 23 taxa on P. pectinatus belonging to epiphytic diatom flora in the study area. Navicula gregaria, N. rhyncocephala, N. radiosa, Ulnaria ulna, Cymbella ventricosa and Diatoma vulgaris were found to be important among the epiphytic algae. Comparing P. pectinatus with other species, it is characterized by low epiphyton diversity and high Cocconeis placentula dominanc

Use of different indices to assess the ecological status of lake systems in the eastern mediterranean river basin

The objective of this research was to assess the ecological status of lentic systems in the Eastern Mediterranean River basin (Türkiye) using some biotic (Q index, PT-BV, MedPTI, TDIL, and PTI) and abiotic (WQI, WQImin-nw, TSI, TLI, and Kna) indices. Phytoplankton species such as Peridinium cinctum, Ceratium hirundinella, and Gyrosigma balticum were the species that contributed the most to the algal biovolume of lake systems with different ecological statuses in the basin. According to the results, it was seen that CCA coordination, which analyzed the relationship structures between dominant phytoplankton taxa and environmental water quality parameters, explained the variation sufficiently. As pointed out in the CCA analysis, conductivity and ammonium were the main environmental parameters influencing algal assemblages at sampling sites in the basin (p 0.05). Among the indices used in this study, it seems that diatom-based TDIL and physicochemical-based WQI appear to be the most suitable indices for assessing the ecological status of lentic systems in the Mediterranean region. Accordingly, it can be deduced that coupling biotic and abiotic indices is more accurate in determining the water quality of lentic systems.This study was estimated the correlations between various physicochemical parameters, phytoplankton species, different indices, and to evaluate the ecological status of the lentic systems in the Eastern Mediterranean River basin in Turkey

Stratification strength and light climate explain variation in chlorophyll a at the continental scale in a European multilake survey in a heatwave summer

To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L-1), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chlorophyll a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the warmest yet most weakly stratified and had significantly less Chl a than Boreal lakes, where the temperature anomaly from the long-term average, during a summer heatwave was the highest (+4 degrees C) and showed a significant, exponential relationship with stratification strength. This European survey represents a summer snapshot of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both affected by climate change, are better predictors for phytoplankton biomass in nutrient-rich lakes than nutrient concentrations and surface temperature.Peer reviewe