Seasonal variations in phytoplankton composition and biomass in a small lowland river-lake system (Melen River, Turkey)

WOS: 000294698400012A series of studies were carried out to determine the succession and phytoplankton community of the Melen River in the Western Black Sea region of Turkey. The study was conducted at 6 stations at monthly intervals between May 2003 and April 2004. It was observed that the abundance and biovolume of phytoplankton were low in winter, though higher values were recorded in late spring and summer. Among the values noted, the spring peak was 534.38 x 10(5) ind. L-1 and 7384.8 mm(3) L-1 belonging to Peridinium sp. The most common diatom, Cyclostephanos dubius, was favoured by low discharge at stations 1 and 2 in the early summer (214.29 x 10(5) in L-1 and 9.84 x 10(5) in L-1), respectively. Chlorophyll-a concentrations were between 0.86 and 64.2 mu g L-1. A total of 135 taxa belonging to Cyanophyta, Bacillariophyta, Chlorophyta, Dinophyta, Euglenophyta, Heterokontophyta, Streptophyta, and Xanthophyta were identified. The total biomass of the stations 1 and 2 was mainly characterised by Dinophyta and at other stations by Bacillariophyta. Five major genera (Peridinium, Ceratium, Phacus, Cyclostephanos, and Melosira) accounted for over 70% of the total phytoplankton abundance. Phytoplankton abundance was significant and positively correlated with Chl-a and temperature (r = 0.57 and r = 0.78, respectively P < 0.05). Species richness and diversity indices increased gradually throughout the course of the river.Gazi University, Scientific Projects Research ManagementGazi UniversityWe would like to thank Gazi University, Scientific Projects Research Management for financing this research and also the General Directorate of State Hydraulic Works (DSI) for analysing the physical and chemical parameters of the Melen River

Biosorption of Cr(VI) by free and immobilized Pediastrum boryanum biomass: equilibrium, kinetic, and thermodynamic studies

15th International Symposium on Toxicity Assessment (ISTA) -- JUL 03-08, 2011 -- City Univ Hong Kong, Hong Kong, PEOPLES R CHINAWOS: 000306790200053PubMed ID: 22374187The biosorption of Cr(VI) from aqueous solution has been studied using free and immobilized Pediastrum boryanum cells in a batch system. The algal cells were immobilized in alginate and alginate-gelatin beads via entrapment, and their algal cell free counterparts were used as control systems during biosorption studies of Cr(VI). The changes in the functional groups of the biosorbents formulations were confirmed by Fourier transform infrared spectra. The effect of pH, equilibrium time, initial concentration of metal ions, and temperature on the biosorption of Cr(VI) ion was investigated. The maximum Cr(VI) biosorption capacities were found to be 17.3, 6.73, 14.0, 23.8, and 29.6 mg/g for the free algal cells, and alginate, alginate-gelatin, alginate-cells, and alginate-gelatin-cells at pH 2.0, which are corresponding to an initial Cr(VI) concentration of 400 mg/L. The biosorption of Cr(VI) on all the tested biosorbents (P. boryanum cells, alginate, alginate-gelatin, and alginate-cells, alginate-gelatin-cells) followed Langmuir adsorption isotherm model. The thermodynamic studies indicated that the biosorption process was spontaneous and endothermic in nature under studied conditions. For all the tested biosorbents, biosorption kinetic was best described by the pseudo-second-order model.PROCORE-France/Hong Kong Joint Res Scheme, Croucher Fdn, KC Wong Educ Fd

Küçük bir nehir - göl sisteminin fitoplankton kompozisyonu ve biyomasındaki mevsimsel değişimler (Melen nehri, Türkiye)

Melen Nehrindeki araştırmalar fi toplankton topluluğu ve mevsimsel değişimini ortaya koymak için yapılmıştır. Bu çalışma Mayıs 2003 ve Nisan 2004’te altı istasyonda aylık olarak sürdürülmüştür. Fitoplankton bolluğu ve biyoması kış aylarında düşük, ilkbahar sonu ve yaz aylarında yüksek değerlerde kaydedilmiştir. Peridinium sp.’ye ait ilkbahar pik değerleri 534,38 × 105 birey L-1 ve 7384,8 mm3 L-1’dir. En yaygın diyatom türü olan Cyclostephanos dubius, birinci ve ikinci istasyonlarda debinin düşük olduğu erken yaz aylarında iyi gelişim göstermiştir (214,29 × 105 birey L-1 ve 9,84 × 105 birey L-1). Chlorophyll-a konsantrasyonları 0,86-64,2 ?g L-1 arasında kaydedilmiştir. Cyanophyta Bacillariophyta, Chlorophyta, Dinophyta, Euglenophyta, Heterokontophyta, Streptophyta ve Xanthophyta’ ya ait toplam 135 takson teşhis edilmiştir. Birinci ve ikinci istasyonların toplam biyoması Dinophyta, diğer istasyonlar ise Bacillariophyta tarafından karakterize edilmiştir. Peridinium, Ceratium, Phacus, Cyclostephanos ve Melosira cinsleri toplam fi toplankton bolluğunun %70’ini oluşturmuştur. Fitoplankton bolluğu, klorofi l a ve sıcaklık ile önemli pozitif korelasyon göstermiştir (sırasıyla, r = 0,57 and r = 0,78, P < 0,05). Tür zenginliği ve diversity indisleri nehir boyunca giderek artmıştır.A series of studies were carried out to determine the succession and phytoplankton community of the Melen River in the Western Black Sea region of Turkey. Th e study was conducted at 6 stations at monthly intervals between May 2003 and April 2004. It was observed that the abundance and biovolume of phytoplankton were low in winter, though higher values were recorded in late spring and summer. Among the values noted, the spring peak was 534.38 x 105 ind. L-1 and 7384.8 mm3 L-1 belonging to Peridinium sp. Th e most common diatom, Cyclostephanos dubius, was favoured by low discharge at stations 1 and 2 in the early summer (214.29 x 105 ind. L-1 and 9.84 x 105 ind. L-1), respectively. Chlorophyll-a concentrations were between 0.86 and 64.2 µg L-1. A total of 135 taxa belonging to Cyanophyta, Bacillariophyta, Chlorophyta, Dinophyta, Euglenophyta, Heterokontophyta, Streptophyta, and Xanthophyta were identifi ed. Th e total biomass of the stations 1 and 2 was mainly characterised by Dinophyta and at other stations by Bacillariophyta. Five major genera (Peridinium, Ceratium, Phacus, Cyclostephanos, and Melosira) accounted for over 70% of the total phytoplankton abundance. Phytoplankton abundance was signifi cant and positively correlated with Chl-a and temperature (r = 0.57 and r = 0.78, respectively P < 0.05). Species richness and diversity indices increased gradually throughout the course of the river

Aşağı Fırat Havzası sulak alanlarının alg florasındaki bol ve yaygın türler

Güneydoğu Anadolu Bölgesi, Aşağı Fırat Havzası algleri Ekim 2001 ve Ağustos 2003 tarihleri arasında belirlenen 21 istasyonda farklı habitatlardan (plankton, epipelon, epifiton, epiliton) alınan örnekler üzerinde araştırılmıştır. Yoğunluk değerlerine göre Cyanobacteria, Bacillariophyta, Chlorophycophyta sıralaması göze çarpmaktadır. Microcystis aeruginosa Eylül 2002’de Atatürk Barajı ve Halfeti Barajı planktonunda aşırı çoğalmıştır. Cyclotella ocellata Eylül 2002, Cyclostephanos dubius Mayıs 2003’te, Ceratium hirundinella ise Ağustos 2003’te aşırı çoğalma derecesine yakın yoğunlukta olduğu söylenebilir. Yoğunluk gösteren diyatomeler daha çok planktonda tespit edilmiştir. Limnothrix, Lyngbya, Oscillatoria, Phormidium, Pseudoanabaena ve Spirogyra türleri diğerlerine göre daha yaygın olmuşlardır. Limnothrix, Phormidium, Pseudoanabaena, Oscillatoria türleri ile Leiblenia epiphytica ve Phormidium mucicola gibi türlerin bolluk dereceleri akarsularda Eylül ve Şubat aylarında artmıştır. Bu aylarda bölgede su sıcaklığı yaklaşık 18-22°C ölçülmüştür. Kimyasal ve biyolojik verilere bağlı olarak havzanın geneli mezotrofik iken, kanalizasyon girdilerinin olduğu bazı çayların ötrofik karakterli olduğu gözlenmiştir.The research on the algae of the Lower Euphrates Basin of the South East Anatolian Region was done between November 2001 and August 2003 at twenty one stations each, on four different habitats (plankton, epipelon, epifithon, epilithon). Due to the density level of species, Cyanobacteria, Bacillariophyta and Chlorophycophyta were conspicous. A bloom of Microcystis aeruginosa was observed in Atatürk and Halfeti Reservoirs in September 2002. In the same period, Cyclotella ocellata, in May 2003 Cyclostephanos dubius, and in August the same year. It could be said that Ceratium hirundinella species were close to bloom level. High density diatoms were found more in plankton. Species such as Oscillatoria spp., Spirogyra spp. and Lyngbya spp. were observed to be more wide-spread than the others. Species such as Oscillatoria spp., Leiblenia epiphytica and Phormidium mucicola increased in abundance in February and September in running waters. Within these months, water temperature in the region ranged between 18-22ºC. According to some chemical and biological data, the basin was mesotrophic while some streams with sewage inputs, were observed to have eutrophic characteristics

The Abundant and Wide-Spread Species of Algae in the Algal Flora of the Lower Euphrates Basin Wetlands

WOS: 000293210300008The research on the algae of the Lower Euphrates Basin of the South East Anatolian Region was done between November 2001 and August 2003 at twenty one stations each, on four different habitats (plankton, epipelon, epifithon, epilithon). Due to the density level of species, Cyanobacteria, Bacillariophyta and Chlorophycophyta were conspicous. A bloom of Microcystis aeruginosa was observed in Ataturk and Halfeti Reservoirs in September 2002. In the same period, Cyclotella ocellata, in May 2003 Cyclostephanos dubius, and in August the same year. It could be said that Ceratium hirundinella species were close to bloom level. High density diatoms were found more in plankton. Species such as Oscillatoria spp., Spirogyra spp. and Lyngbya spp. were observed to be more wide-spread than the others. Species such as Oscillatoria spp., Leiblenia epiphytica and Phormidium mucicola increased in abundance in February and September in running waters. Within these months, water temperature in the region ranged between 18-22 degrees C. According to some chemical and biological data, the basin was mesotrophic while some streams with sewage inputs, were observed to have eutrophic characteristics.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TBAG-2046 (101047)]The study was supported by TUBITAK Project No. TBAG-2046 (101047)

New Records for the Freshwater Algae of Turkey

WOS: 000267839700009Algae samples were collected from important dam lakes and running waters of the Lower Euphrates Basin. Eighteen new records of Turkish freshwater algae were identified. Among these new records, 5 belong to Cyanophyta, 10 to Chlorophyta, 1 to Xanthophyta, and 2 to Bacillariophyta

Türkiye tatlısu algleri için yeni kayıtlar

Alg örneklemeleri, Aşağı Fırat Havzası içerisindeki baraj göllerinden ve nehir sistemlerinden yapılmıştır. Türkiye tatlısu algleri için on sekiz yeni kayıt verilmiştir. Bunlar içerisinden beşi Cyanophyta, Onu Chlorophyta, biri Xanthophyta ve ikisi Bacillariophyta bölümlerine aittir.Algae samples were collected from important dam lakes and running waters of the Lower Euphrates Basin. Eighteen new records of Turkish freshwater algae were identified. Among these new records, 5 belong to Cyanophyta, 10 to Chlorophyta, 1 to Xanthophyta, and 2 to Bacillariophyta

Spatial and temporal variations in composition of algae assemblages with environmental variables in an urban stream (Ankara, Turkey)

WOS: 000468588200002PubMed ID: 31115704Phytoplankton and epipelon assemblages form the main constituents, and they are producers in aquatic ecosystems, such as streams and rivers. This study was carried out between May 2008 and April 2009 to determine the impacts of polluted water on species variations, compositions, and community metrics in phytoplankton and epipelon at six stations on Ankara Stream. A total of 231 taxa were recorded during the study period, with 131 Bacillariophyta, 3 Charophyta, 41 Chlorophyta, 30 Cyanobacteria, 25 Euglenophyta, and 1 Ochrophyta. Heterogeneity of the stream stations was determined by the use of hierarchical cluster analysis (HCA). Community metrics were compared by using non-parametric tests, while canonical correspondence analysis (CCA) was used for the relationships between environmental variables and species. Variations in water quality and species composition along the stream flow revealed a significant spatial heterogeneity (p<0.05). However, the upper stations of the stream were represented by unpolluted water quality with low nutrients and conductivity, and the mid- and downstream stations were characterized by high concentrations of ammonia (up to 60mgL(-1)) and o-phosphate (up to 25mg/L), with low concentrations of dissolved oxygen (<1mgL(-1)). The results, clearly supported by indicator taxa, showed that various domestic and industrial discharges affected the increase in pollution and the spatial heterogeneity. The findings obtained in this study will contribute to future improvements in Ankara Stream watershed studies