Ahmet Altındağ

Ecological effects of some heavy metals (Cd, Pb, Hg, Cr) pollution of phytoplanktonic algae and zooplanktonic organisms in Sariyar Dam Reservoir in Turkey

Accumulation of heavy metals (Cd, Pb, Hg, Cr) in water and plankton of Sarýyar Dam Lake (SDR) was seasonally studied from April, 2000 to December, 2004. In addition, seasonal changes in phytoplankton and zooplankton populations and species abundance were also determinate. Some physio-chemical parameters of water and their correlation with heavy metals were also determinated. The dominant phytoplanktonic algae determined were Choroococcus, Gomphospheria, Oscillatoria, Phormidium, Anabaena, Nostoc, Cystodinium, Dinobryon, Ankistrodesmus, Chlorella, Coelastrum, Oocystis, Pediastrum, Scenedesmus, Cosmarium, Oedogonium, Cyclotella, Achnanthes, Amphora, Anomoneis, Cocconeis, Cymbella, Diatoma, Diploneis, Fragilaria, Gomphonema, Navicula, Nitzschia, Nitzschia, Rhoicosphenia, Surirella and Synedra. The dominant zooplanktonic organisms determined were Asplachna priodonta, Brachionus angularis, Keratella quadrata, Keratella cochlearis, Keratella tropica, Polyarthra vulgaris, Proales decipiens, Bosmina longirostris, Ceriodaphnia quadrangula, Chydorus sphaericus, Daphnia longispina, Diaphanosoma brachyurum, Macrothrix laticornis, Acanthocyclops robustus and Acanthodiaptomus denticornis. High concentrations of all heavy metals were recorded in the plankton. Hg was lowest and Pb highest; but the concentration of each metal varied seasonally.

Six Rotifer species new for the Turkish fauna

Abstract The distribution of Rotifers in 18 dam lakes and natural lakes of Inner Anatolia, the Western Black Sea Region, the Mediterranean Region and Eastern Anatolia was studied between 1999 and 2004. Ninety rotifer species were found, of which six (Brachionus forficula, Dicranophorus epicharis, Epiphanes macrourus, Lecane rhytida, Lecane obtusa, Testudinella parva) are new to the Turkish fauna.

DECREASE AND INCREASE PROFILE OF CU, CR AND PB DURING STABLE PHASE OF REMOVAL BY DUCKWEED (LEMNA MINOR L.)

The present work details the decrease-increase profiles of Cu, Cr, and Pb by the aquatic plant Lemna minor. A mixture of these metals were utilized at different concentrations. Removal profiles of each metal was determined with water samples taken every 24 h for a 144 h period after the 48 h mark and was examined with correlation analysis. Removal profiles of Cr and Pb by L. minor from the mixture were observed to be highly similar with each other (r = 0.943). High proportion of Cr and Pb were removed compared to Cu and removal equations were defined with the aid of regression analysis.

A short list of Rotifers from Turkey

Abstract The distribution of Rotifers in 19 dams, lakes and water reservoirs of Central Anatolia, the Western Black Sea Region and the Mediterranean Region of Turkey was studied between 1992 and 1999. 71 Rotifer species were found, of which five, Lecane hastata, L. rugosa, L. scutata, Proales decipiens, and Resticula gelida, are new to the Turkish fauna.

Interactions between metals accumulated in the narrow-clawed crayfish Astacus leptodactylus (Eschscholtz, 1823) in Dikilitaş Lake, Turkey

The accumulations of Al, Cd, Cr, Cu, Fe, Ni, Pb and Zn in the exoskeleton, gills, hepatopancreas and abdominal muscles of crayfish Astacus leptodactylus (Eschscholtz, 1823) were determined. The strongest correlation observed was between Cr and Ni in the gills (r = 0.904); moderate to strong correlations between Al, Cr, Fe, Ni and Cu were also observed in gill tissue. Disregarding the gills, the strongest correlation was found between Cu and Zn in the hepatopancreas (r = 0.808); the correlation between these two metals might have been a result of metallothionein activity. The accumulation of Pb was found to correlate with that of Cd in the exoskeleton, Cd and Zn in the gills, Zn and Cu in the hepatopancreas and Cu in the abdominal muscle. None of these correlations were present in lakewater and sediment samples, suggesting that the crayfish metabolism may be responsible for the co-accumulation of metal–metal pairs. As all correlations in non-gill tissues are observed between divalent metals, a shared transporter such as divalent metal transporter 1 might be involved in the accumulation of these metals.

The Zooplankton Community of Lake Mogan, Turkey

ABSTRACT We surveyed the zooplankton community of Lake Mogan, which has been undergoing gradual eutrophication in recent decades. The zooplankton was dominated by Rotifera (91.1%), followed by Copepoda (7.7%) and Cladocera (1.2%). The dominant species were Filinia longiseta, Brachionus angularis, Synchaeta pectinata, Anureopsis fissa, Polyarthra vulgaris, Lecane clostrocerca, Arctodiaptomus acutilobatus, Hexarthra oxyuris, Polyarhtra dolichoptera and Arctodiaptomus bacillifer. The zooplankton composition of Lake Mogan has changed dramatically since the 1970s when rotifers did not dominate the community.

Correlations in metal release profiles following sorption by Lemna minor

ABSTRACT Following the rapid uptake of contaminants in the first few hours of exposure, plants typically attempt to cope with the toxic burden by releasing part of the sorbed material back into the environment. The present study investigates the general trends in the release profiles of different metal(loid)s in the aquatic macrophyte Lemna minor and details the correlations that exist between the release of metal(loid) species. Water samples with distinct contamination profiles were taken from Nilüfer River (Bursa, Turkey), Yeniçağa Lake (Bolu, Turkey), and Beyşehir Lake (Konya, Turkey) and used for release studies; 36 samples were tested in total. Accumulation and release profiles were monitored over five days for 11 metals and a metalloid (208Pb, 111Cd, 52Cr,53Cr,60Ni,63Cu,65Cu,75As,55Mn, 137Ba, 27Al, 57Fe, 66Zn,68Zn) and correlation, cluster and principal component analyses were employed to determine the factors that affect the release of these elements. Release profiles of the tested metal(loid)s were largely observed to be distinct; however, strong correlations have been observed between certain metal pairs (Cr/Ni, Cr/Cu, Zn/Ni) and principal component analysis was able to separate the metal(loid)s into three well-resolved groups based on their release.

A short list of Cladoceran species (Crustacea) from Turkey

Abstract Between 1992 and 1999, the distribution of Cladoceran species was studied at 19 different localities in Central Anatolia, the Mediterranean region and the Western Black Sea region of Turkey, including six dams, 11 lakes and two rivers. A total of 31 species was recorded, some of which are recorded for the first time at these localities.