Samples were collected from different habitats (plankton, epipelon, epiphyton, and epilithon) at 20 stations situated on rivers and dam systems in the Tigris Basin between December 2004 and November 2005. Twenty-five new records were identified for the Turkish freshwater algae. | Research Article Turk J Bot 36 (2012) 747-760 © TÜBİTAK doi: New records for the freshwater algae of Turkey (Tigris Basin) Tülay BAYKAL ÖZER1,*, İlkay AÇIKGÖZ ERKAYA2, Abel Udo UDOH2, Aydın AKBULUT3, Kazım YILDIZ2, Bülent ŞEN4 1 2 Department of Biology, Faculty of Arts and Science, Ahi Evran University, 40100 Kırşehir - TURKEY Department of Biology, Faculty of Education, Gazi University, 06500 Teknik Okullar, Ankara - TURKEY 3 Department of Biology, Faculty of Science, Gazi University, Ankara - TURKEY 4 Faculty of Aquaculture, Fırat University, Elazığ - TURKEY Received: ● Accepted: Abstract: Samples were collected from different habitats (plankton, epipelon, epiphyton, and epilithon) at 20 stations situated on rivers and dam systems in the Tigris Basin between December 2004 and November 2005. Twenty-five new records were identified for the Turkish freshwater algae. They belong to the following divisions: 3 to Cyanobacteria, 1 to Rhodophya, 1 to Euglenozoa, 2 to Myzozoa, 1 to Ochrophyta, 9 to Chlorophyta, and 8 to Charophyta. Key words: Algae, new record, freshwater, Dicle Reservoir, South-East Anatolian region Introduction Unlike in the past, today freshwater algae research is progressing rapidly in Turkey. However, longterm monitoring of changes in algal diversities and population studies are rarely done. Therefore, 2 different studies were planned in this research to determine the algal flora of the South-East Anatolian region Euphrates and Tigris basins. Recently, since many studies on the diversity and ecology of diatoms have been done (Atıcı & Obalı, 2010; Kıvrak & Uygun, 2012; Solak et al., 2012), new records of algae except Bacillariophyta are greater in number in Turkey (Çelekli et al., 2007; Çevik et al., 2007; Baykal et al., 2009; Sevindik et al., 2010; Sevindik et al., 2011). To date, except in Devegeçidi Reservoir and the Euphrates Basin (Aysel, 2005; Baykal et al., 2009), there have been no records .