Ecological study of the diatoms in Chehel Chay River in Golestan province

Document Type : scientific research article

Authors

1 Department of Biology, Faculty of basic science, Gonbad Kavous University, Gonbad kavous, Iran

2 Department of biology, faculty of basic science, gonbad kavous university, gonbad kavous, Iran.

3 Gonbad Kavous University

4 Department of Biology, Faculty of basic science, Gonbad Kavous university, Gonbad kavous, Iran

Abstract

Diatoms are a group of algae, identifiable under the light microscope by their yellow-brown coloration and by presence of a thick silica wall. These organisms have particular ecologic preferences and tolerances, which make them useful indicators for ecological conditions, and nowadays are used in water quality issues extensively. Chehel Chay River is one of main tributaries of Gorgan Rud. In this survey, epilithic and epipelic diatoms of this river were studied. Sampling was done seasonally from 5 stations on river during 2016. Along with diatom samples, physic-chemical parameters of water were analysed. In total, 32 species belongs to 18 genera were identified. The biggest genera according to species number were Nitzschia with 5 species and Gomphonema with 4 species. Dominant species in epipelic samples were Cymbella affinis, Navicula tripunctata, Nitzschia dissipata and Rhoicosphenia abbreviate and in epilithic samples: Achnanthidium gracillimum, Cymbella affinis, Diatoma moniliformis and Navicula tripunctata. In this study, pH, phosphate, temperature, nitrate, ammonium, silica, EC and TDS were recognized as most effective parameters on distribution of diatoms in Chehel Chay River.

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Journal of Utilization and Cultivation of Aquatics
Volume 7, Issue 3
December 2018
Pages 41-51

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