Identify Diatoma Genus and Study of Physicochemical factors in their distribution

Subject Areas : environmental management

Fatemeh Jamallou ¹ , Taher Nejad sattari ²

1 - Assistant Prof, Deptartment of Biology, Qom Branch, Islamic Azad University, Qom, Iran * (Corresponding Author).
2 - - Associate Prof, Deptartment of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran

Received: 2009-05-09 Accepted : 2009-08-29 Published : 2016-12-21

Keywords: Diatoma, Physicochemical Factors, distribution,

Abstract :

Background and Objective: Diatoma De Candolle is common algae flora in   equatic ecosystem. Epilithic, Epipelic and Epiphytic population are the best indicator for water quality. Method: In this study, samples were taken on monthly, of 6 different station of rock, sediment and plant surface. Physicochemical parameters such as temperature , pH, Electrical Counductivity and Dissolved Oxygen  were insitu measured in site and Biological Oxygen Demand and Chemical Oxygen Demand were measured in  laboratory. Diatoms identify on the basis of morphological characters of the silica cell wall. Findings: species from Diatoma De Candolle in Jajrood river were identified consist of: Diatoma anceps (Ehr.) Kirchn. Diatoma ehrenbergii Kutz. Diatoma mesodon (Ehr.) Kutz. Diatoma tenuis C. A. Agardh.  Diatoma vulgare Var. breve Grun.  Diatoma vulgare Var. linearis V. H.  Diatoma vulgaris Bory. Discussion and Counclusion: Physicochemical factors such as BOD and COD  increases and the water pollution index, are down the river is significant pollution increases. Diatoms counting showed diatoms density down the river to increase. Two-way ANOVA showed a significant correlation is between increased diatoms density and increased pollution.

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