ÖzetKarasu Nehri (Erzincan)'nin zooplanktonunu belirlemek amacıyla Şubat 2012 ve Ocak 2013 tarihleri arasında mevsimsel olarak alınan örnekler incelenmiştir. Zooplankton örnekleri plankton ağı kullanılarak 3 istasyon'dan alındı. Çalışmamızda Rotiferadan 32, Cladoceradan 5 ve Copepodadan 2 olmak üzere toplam 39 zooplankton türü teşhis edilmiştir. Çalışma bu akarsuda yapılan ilk zooplankton çalışması olması bakımından önemlidir.Anahtar kelimeler: Rotifera, Cladocera, Copepoda, Karasu Nehri Zooplankton of Karasu River (Erzincan) AbstractKarasu River (Erzincan) zooplankton was examined from seasonal taken samples between February 2012 and January 2013. Zooplankton samples were taken from 3 stations by use of a plankton net.Totaly 39 species including, 32 species from Rotifera, 5 species Cladocera and 2 species Copepoda were identified in our this study. The study has got an importance as to be the first study on zooplankton in Karasu River

In the zooplankton samples taken between April 2017-March 2018 in Uzuncayır Dam Lake, a total of 36 species, 28 species from Rotifera, 5 species from Cladocera and 3 species from Copepoda, were recorded. Asplanchna priodonta, Synchaeta oblonga, Synchaeta pectinata, Polyarthra dolichoptera are the most recorded species. Some water quality parameters have been measured. The results showed that the water temperature in Uzuncayır Dam Lake was 3.8-27.10 0 C, pH 8.1-9.6, dissolved oxygen 6.4-14.2 mg / L, electrical conductivity 223-422 (μS / cm) and the secchi depth changed to the highest 5.5 m.

IntroductionCadmium (Cd 2+ ) is a toxic metal that influences the physiological activity and growth of biota even at low concentrations. Except for Thalassiosira weissflogii, Cd 2+ is an unessential metal for biota (Lane et al., 2005). The amount of Cd 2+ in surface waters has been markedly growing with the increase in disposal caused by iron and steel production, melting, manufacturing, electronic (nickel-cadmium batteries) industries, and agricultural activities with phosphate fertilizers (Hayat et al., 2019;. Disposal of such huge wastewaters into surface waters (e.g., rivers and lakes) cause major environmental problems for freshwater resources and biota (Wang and Chen, 2009;Zeraatkar et al., 2016). According to the United States Environmental Protection Agency, Cd 2+ is considered one of the most hazardous contaminant threats to biota and the environment. Cd 2+ can be easily taken and accumulated by primary producers and transferred to higher trophic levels through the food web (Wang and Chen, 2009;Templeton and Liu, 2010;Andosch et al., 2012). It is known that Cd 2+ , a mutagenic and carcinogenic metal, affects calcium metabolism in biological systems (Sarwar et al., 2017). Besides, Cd 2+ binds to organic molecules, and this may cause a wide range of adverse effects on living biota such as cancer, allergies, skin irritation, cell membrane damage, and a change of transporter systems and denaturation of proteins and enzymes (Andosch et al., 2012;Sarwar et al., 2017).Cd 2+ exposure promotes the formation of reactive oxygen species in organisms (Pinto et al., 2003), leading to morphological changes in the nucleus (Souza et al., 2011), lipid peroxidation (Pinto et al., 2003Çelekli et al., 2016), morphological changes in the structure of cells, changes in the electron transport system, and cell death (Verbruggen et al., 2009;Andosch et al., 2012). Organisms under this type of stress demonstrate a few responses via metal detoxification and antioxidant defenses (Branco et al., 2010;Gomes and Asaeda, 2013). Some biomolecules, like ascorbic acid, phenolics, carotenoids, and glutathione, are produced to get rid of these reactive molecules (Branco et al., 2010;Gomes and Asaeda, 2013). Extracellular and/ or intracellular metal exclusion through formation with diverse ligands, storage into vacuoles, and the pumping out of metal make up thevarious metal detoxification Research ArticleThis work is licensed under a Creative Commons Attribution 4.0 International License.

Zooplankton of Murat River was examined from monthly taken samples between June 2011 and May 2012. As a result of research were identified total 33 species, 25 of them belong to Rotifera, 6 belong to Cladocera, 2 belong to Copepoda. Zooplanktonik species were comprised as 75.76% Rotifera 18.18% Cladocera and 6.06% Copepoda species. There was marked decrease in at the zooplankton species diversity in winter months. There was sharp increase at the zooplankton species diversity in spring and in summer months. Especially in spring month’s zooplankton were recorded in highest species and numbers individual. The most species were determined in April (nine species). At least species were determined January (four species). pH, dissolved oxygen, water temperature were measured of the study area. The study has got an importance as to be the first research on zooplankton in this area.

The present study was conducted to determine zooplankton fauna of Kiğı Dam Lake during September 2012 and August 2013 seasonally. The zooplankton samples were collected by using plankton net with the mesh size of 55µm horizontally and preserved in 4% formaldehyde. Total 22 taxa (16 Rotifera, 4 Cladocera, and 2 Copepoda) were identified in Kiğı Dam Lake. , Cyclops vicinus from Copepoda species are new records for this dam lake. Zooplankton samples were consisted of 72.7% Rotifera, 18.2% Cladocera, and 9.1% Copepoda. ÖzetKığı Baraj Gölü'nün zooplankton faunasını belirlemek için Eylül 2012 -Ağustos 2013 arasında yapılan mevsimsel çalışmada zooplankton örnekleri, 55 µm göz açıklığına sahip plankton kepçesi yardımıyla horizontal olarak toplanmış ve %4'lük formolde tespit edilmiştir. Baraj Gölü'nde toplam 22 takson (16 Rotifera, 4 Cladocera ve 2 Copepoda) teşhis edilmiştir Rotiferlerden , Cyclops vicinus bu baraj gölü için yeni kayıttır. Zooplanktonik organizmaların % 72,7'sini Rotifera, % 18,2'sini Cladocera ve % 9,1'ini Copepoda oluşturmuştur.Anahtar kelimeler: Kığı Baraj Gölü, sür dağılımı, zooplankton.