Arif Gönülol

Epizoic Freshwater Algae on Emys orbicularis (Testudinata: Emydidae) from the Central Anatolia Region of Turkey

ABSTRACT We surveyed the epizoic algae growing on Emys orbicularis from several sites in the Central Anatolia region of Turkey during the nesting season (May-August) of 2005. Fifty-three algae species were found on carapaces of thirty-five E. Orbicularis, with considerable variation in the algal communities from different sites.

Phytoplankton seasonality of a shallow turbid lake

This work analyses the seasonality of phytoplankton (species richness, biovolume, diversity, abundance and dominance) associated with some physical, chemical and climatic variables of shallow turbid lake (Tatlι Lake, Turkey) between February 2000 and April 2001. Samples were collected monthly from the two stations from the surface (0–20 cm). Species richness and diversity (Shannon-Weaver, H’) index were calculated. Seasonal changes in phytoplankton community structure (i. e., the species present and their relative abundances) were evaluated with Nonmetric Multidimensional Scaling (NMDS) ordinations. Canonical Correspondence Analysis (CCA) was used to investigate the relationship between phytoplankton and physico-chemical parameters. A total of 144 species most of which belonged to the Bacillariophyta and Chlorophyta could be identified. Other taxonomic groups were Cyanoprokaryota, Euglenophyta, Pyrrophyta, Cryptophyta and Xanthophyta. The diatoms Cyclotella ocellata PANTOCSEK, Nitzschia palea (KUTZING) W. SMITH, Fragilaria ulna LANGE-BERTALOT and the green algae Ankistrodesmus falcatus (CORDA) RALFS show continuously high portions in the phytoplankton assemblage. High salinity and turbidity of the lake restricted the species number.

The Phytoplankton of Lake Akgöl, Turkey

ABSTRACT Between June 1997 and May 1998, we surveyed the phytoplankton of Lake Akgöl, a shallow Turkish lake near the Black Sea. A total of 119 taxa, most of which belonged to the Chlorophyta and Bacillariophyta, was identified. Other groups were Euglenophyta, Cyanophyta, Cryptophyta, Xanthophya, Chrysophyta and Dinophyta.

Seasonal Variation of the Phytoplankton of Lake Ladik Samsun, Turkey

ABSTRACT The composition and seasonal variations of phytoplankton of Lake Ladik were studied between June 2000 and May 2001. The taxa identified included members of Cyanoprokaryota (8), Bacillariophyta (46), Chlorophyta (54), Euglenophyta (30), Cryptophyta (2), Dinophyta (1) and Xanthophyta (1). In the phytoplankton, Cyclotella ocellata, Aulacoseria distans, Trachelomonas hispida, T. volvocina var. punctata, Cryptomonas ovata, Pediastrum spp., and Scenedesmus spp. were common organisms. Seasonal variations in phytoplankton appeared to be related to availability of light and temperature rather than various measured nutrients.

The Phytoplankton of Karabogaz Lake in Samsun, Turkey

ABSTRACT We conducted monthly surveys of the phytoplankton of Karabogaz Lake in Turkey and found a total of 68 taxa occuring at different times throughout the year. They included Bacillariophyta (19 taxa), Chlorophyta (17), Cryptophyta (1), Euglenophyta (12), Dinophyta (3) and Cyanobacteria (19). Even Though considerable numbers of cyanoprokaryotes were observed, the diversity of the phytoplankton and nutrient analyses would indicate that Karabogaz Lake is currently in a mesotrophic state of development.

EPIPHYTIC DIATOMS ON CLADOPHORA RIVULARIS (LINNAEUS) HOEK (CHLOROPHYTA) AND POTAMOGETON PECTINATUS LINNAEUS (SPERMATOPHYTA) IN LAKE SIMENIT (SAMSUN—TURKEY)

The epiphytic algae of Lake Simenit were investigated from July 2000 to May 2001. In total, 66 taxa of epiphytic diatoms were identified. Of the taxa determined, 62 were found on Cladophora rivularis and 52 were found on Potamogeton pectinatus. Among the epiphytic algae, Cocconeis pediculus, C. placentula, Rhoicosphenia abbreviata, Fragilaria ulna, Amphora ovalis, Cyclotella meneghiniana and C. glomerata were abundant. The lake water was slightly alkaline and its hardness varied between hard and very hard. Of the different factors effecting the diatom composition conductivity, total hardness, dissolved oxygen, sulphate, chloride and temperature were the most important environmental variables. Species richness and diversity (Shannon-Weaver) were calculated for epiphytic diatoms found on C. rivularis and P. pectinatus. The relationships between the diatom composition and physicochemical variables were analysed by means Canonical Correspondence Analysis.

Rare and new records of diatoms in Turkey from Kütahya flowing waters

Abstract Diatoms are one of the key organisms used in biomonitoring studies and they occur in a wide variety of environments, exhibiting a broad range of tolerance to abiotic factors. Historically, the first freshwater diatom study in Turkey was conducted in 1844 by Ehrenberg based on the material collected from the Murat and Aras Rivers. Situated between large continents (Eurasia and Africa), Turkey comprises areas of very diverse geological, climatic and environmental conditions, so we should expect that organisms such as diatoms show high diversity in this region. The aim of this study is to present new sites of rare and new records in Turkey from different genera along with morphological and ecological characteristics. As a result, a total of 73 species (24 rare and 49 new records) are presented in this study.

Phytoplankton distribution and variation along a freshwater-marine transition zone (Kızılırmak River) in the Black Sea

Abstract Both phytoplankton of the Kizilirmak River/Black Sea transition zone and their interactions with nutrients were investigated between July 2007 and December 2008. A total of 447 taxa belonging to the divisions: Cyanobacteria (24), Bacillariophyta (209), Bigyra (1), Cercozoa (1), Charophyta (11), Chlorophyta (32), Cryptophyta (11), Miozoa (119), Euglenozoa (14), Haptophyta (13), Ochrophyta (10) and Protozoa Incertae Sedis (2) were identified at 5 different sites in the study area. Seventy four taxa were recognized as new records for the Algal Flora of Turkey and 41 taxa were determined as HAB (Harmful Algal Bloom) organisms. According to the hierarchical clustering and MDS analyses, surface phytoplankton were distributed along the salinity gradient from freshwater to saline waters, and the early spring samples were separated from the other samples. However, in addition to the agglomerative hierarchical cluster analysis, the samples were divided into four groups – “Fresh”, “Brackish”, “Marine” and “Early spring-Marine” – as a result of MDS analysis. The results of this study revealed that the surface phytoplankton were influenced by the salinity and the Secchi Disc depth together with the seasonal water temperature dynamics and NO3-N concentrations throughout the research period.