Tychoplanktonic diatoms from a stenothermal spring in iraqi kurdistan

Abstract

Seasonal variations in the tychoplanktonic diatoms are described from Serchinar, a stenothermal spring in Iraqi Kurdistan. The flora was poor in species with only 22 taxa being recorded. Cymbella affinis, Achnanthes amphicephala and Cocconeis placentula var. euglypta dominated the diatom flora and only three other taxa were commonly represented. The total number of suspended diatoms exceeded 250, 000 cells 1-1 during the summer autumn peaks. The abundance and relative frequency of the dominant species is discussed in relation to relevant physical and chemical parameters in the spring. © 1979 Taylor & Francis Group, LLC.