Seasonal variation of epilithic diatom todurge lake (Sivas)

Abstract

The seasonal variation of the composition and concentration of epilithic flora of diatom from chosen sampling eight station on Todurge Lake have been investigated and compared between November-2000 and November-2001. In addition, some physical and chemical parameters were measured at lake water. Calcium and Sulfate have been based chemical component in area. Although The species of genus Cymbella, Amphora, Cocconeis, Gomphonema, Achnanthes and Fragilaria constitute the main composition of the epilithic flora of Todurge Lake, howewer the species belonging to genus Navicula, Nitzschia, Epithemia, Gyrosigma, Pinnularia and Stauroneis are found to be less numerous. During the study, Cymbella affinis Kutz., Cocconeis placentula var. euglypta Ehr., Achnanthidium minutissimum Kutz. Czar., Amphora commutata Grunow, Gomphonema olivaceum (Hornemann) Breb., Mastogloia braunii Grunow have been the dominant species in whole station of Todurge Lake. The species of whole diatom except Epithemia argus Kutz., Caloneis clevei (Lagerst.) Cleve, Stauroneis anceps Ehr., Surirella minuta Breb., were found very frequently and numerous in the whole station. Generally, total organism in all of station increased in the late spring and early summer and decreased in the late winter and late summer. The richness and diversity indices were determined the highest in T6 station, the lowest in T1 and T7 station.