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

Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins

Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.Peer reviewe

Yedikır Baraj Gölü fitoplanktonu’nun kompozisyonu, fonksiyonel sınıflandırılması ve trofik yapısı

Bu çalışma, 25-28 Ağustos 2014 tarihleri ​​arasında Bursa Türkiye'de düzenlenen “6. Ulusal Limnoloji Sempozyumu” nda sunulmuştur.Functional classification, Trophic Status and composition of phytoplankton in Yedikır Dam Lake were studied between October 2004 and April 2006. Although Chlorophyta and Bacillariophyta were dominant in respect to species numbers, Cyanophyta and Chlorophyta type phytoplankton were registered in terms of population density in Yedikır Dam Lake. According to an average chlorophyll a concentration of 16 μg L-1 , Dam Lake belongs to the eutrophic level of the trophic scale. A total of 126 phytoplankton species were identified in the study period, belonging to 18 functional groups. The seasonal succession of dominant functional groups followed this sequence of coda: B (Cyclotella), F (Kirchneriella), J (Crucigenia), H1 (Anabaena, Aphanizomenon), LO (Merismopedia), and W2 (Trachelomonas). Trophic state indices derived from chlorophyll a and transparency, were close together, but both were above the phosphorous index. Values of trophic state indices rank the Yedikır Dam Lake as being eutrophic. According to the some functional groups and indices the phytoplankton biomass in Dam Lake is probably limited by low phosphorus, low light and low nutrients.Yedikır Baraj Gölü fitoplanktonu’nun kompozisyonu, fonksiyonel sınıflandırılması ve trofik yapısı Kasım 2004–Nisan 2006 tarihleri arasında incelenmiştir. Baraj gölünde tür sayısı bakımından Chlorophyta ve Bacillariophyta üyeleri yoğun iken, tür yoğunluğu bakımından Cyanophyta ve Chlorophyta tipi fitoplanktona rastlanmıştır. 16 μg L-1 olan ortalama klorofil konsantrasyonuna göre baraj gölünün trofik derecesi ötrofik düzeyi göstermektedir. Çalışma alanımızda 18 farklı fonksiyonel gruba ait toplam 126 fitoplankton türü tespit edilmiştir. Mevsimsel artışa bağlı dominant fonksiyonel grupların kodon sıralanışı şu şekildedir: B (Cyclotella), F (Kirchneriella), J (Crucigenia), H1 (Anabaena, Aphanizomenon), LO (Merismopedia), and W2 (Trachelomonas). Klorofil a ve seki diski derinliği bağlı gölün trofik yapı indis değerleri birbirine yakın olup toplam fosfat indis değerinden yüksek olmuştur. Trofik yapı indis değerlerine göre Yedikır Baraj Gölü ötrofik kategoridedir. Gerek bazı fonksiyonel gruplar gerekse indis değerlerine göre göl suyundaki ışığın, besinlerin ve fosfatın azlığı baraj gölündeki fitoplankton yapısını sınırlamaktadır

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

Seasonal variation and occurrence of algal turf community in Lake Ladik, Turkey

The 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 taxa of diatoms 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 the study period. 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 PO4 ­ , NH3 ­N. Also the multivariate analysis showed, temperature as the most important factor in the distribution and abundance of diatoms on turf biomass

Türkiye, Kızılırmak Deltası sığ göllerindeki chlorococcal chlorophyta üyelerinin kompozisyonu, kümesel yapısı ve mevsimsel değişimi

The chlorococcal chlorophyte community structure and seasonal variations in terms of species composition and abundance of dominant species in Tatlı, Gıcı, 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 Kızılırmak Delta. While the Chlorococcales composition was similar in Tatlı, Gıcı, 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 Tatlı, Gıcı, 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.Tatlı, Gıcı, Liman ve Cernek göllerindeki (Samsun, Türkiye) tür kompozisyonu ve dominant tür yoğunluğu içindeki chlorococcal chlorophyta üyelerinin kümesel yapısı ve mevsimsel değişimi 1996 ile 2003 tarihleri arasında incelenmiştir. Her gölde belirlenen istasyonların yüzey sularından aylık periyotlarla toplanan örneklerin tür zenginliği ve ShannonWeaver çeşitlilik indisleri hesaplanmıştır. Chlorococcal kümesel yapısı içindeki değişimler çok değişkenli ölçekleme analizi (NMDS) uygulanarak incelenmiştir. Kızılırmak Deltası lagünlerinde Chlorococcales sınıfına ait toplam 36 tür tespit edildi. Tatlı, Gıcı ve Liman göllerinin Chlorococcales kompozisyonu birbirine benzer iken yüksek tür zenginliği gösteren Cernek gölü farklı bir mevsimsel eğilim göstermiştir. Ankistrodesmus falcatus ve Kirchneriella obesa Tatlı, Gıcı ve Liman gölleri Chlorococcales dağılımı içinde önemli türler olmuşlardır. Cernek gölünde ise Monoraphidium irregulare türü Chlorococcales yapısı içinde yüksek değerlere ulaşmıştır. Tüm göllerde Monoraphidium ve Ankistrodesmus tür sayısında kış periyodunda diğer mevsimlere nazaran bariz artışlar gözlenmişti

Seasonal and spatial variation of epilithic algal community in Batlama stream (Giresun, Turkey)

Spatio-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)

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