Isolation and identification of aquatic fungi from Al-diwanya river and possibility to use as pollution indicaters

	Isolation and identification of aquatic fungi from Al-diwanya river and possibility to use as pollution indicaters
journal of kerbala university
Article 1, Volume 7, Issue 2, 2011, Pages 246-263 PDF (0 K)
Abstract
The present study included isolation and identification of aquatic fungi from Al-diwanya river in three stations ,station 1(s1) located at the river iterance to the governorate ,station 2(s2) in the middle of the governorate and station 3(s3) near to the river exit from the governorate , the isolation applied by trapping method from the period January - July 2009, also the ecological parameters were done to the water samples including temperature ,pH ,turbidity, all kinds solid salts, electrical- conductivity , nutrients , dissolved O2 and percentage of saturated oxygen. The results of study showed that:- Many aquatic fungi were isolated included two families : Family:- Saprolegniacea (Achlya sp ، A. Americana ، A. ambisexualis ، A. flagellate ، A .klebsiana ، A. prolifera ، Calypetralegnia ripariensis ، Dictyuchus sp ، D. sterile ، Saprolegnia sp ، S. australis ، S. ferax ، S. parasitica) and family:- Pythiaceae(Pyhium) ,there were variable in the number and occurrence ratio of the isolated fungi from station to another s1 was the major rich in fungi (92)isolates then s2 (62) isolates then s3 (31)isolates, the fungus Saprolegnia ferax recorded the higher in its occurrence (15.67%) and the other fungi recorded the following ratios :- (11.89 , 9.72 , 9.18 , 8.10 , 6.48 , 6.48 ، 5.94 , 5.40 , 4.86 , 4.32 , 3.78 , 2.70) % for the fungi (Saprolegnia sp. ، S. sparasitica ، Dictyuchus sp. ، Achlya americana ، Achlya sp. ، Saprolegnia australis ، Achlya flagellate ، A. prolifera , Pythium sp. , Achlya ambisexualis ، A. klebsiana ، Dictyuchus sterile ، Calypeterlegnia ripariensis) respectively. Also the results showed that the winter months gave the higher total number and occurrence ratio of aquatic fungi in all stations but the s1 was the higher (92)isolate and s3 was the less (31) isolate and these is depend up on the pollution level in the stations. As for as ecological parameters ,the study showed a relationship between air and water temperature ,it was decrease in Winter months and increase in Summer ,temperature degreases were close in the studied stations because of the short distance among themes,the higher value of it was at July (31)cº and the less was at January(11.3)cº. The stream speed also was valued from station to another but it was the higher in January in the s1(51)m/mn. Light transparency ranged between (16.8)cm in January at s1 and (35)cm in May at s3,while the pH ranged between (7.1) in July and (8.3)in May in the first station ,in the second station ranged between (7.3) in January and (8.11) in May,while in the third station ranged between (7)in July and (8.3) in March.The medium of salts was(0.69 , 0.75 , 0.69)% in the three stations respectively the less value of salt was in s1 at April and the higher was in s3 at July.

Statistics Article View: 179 PDF Download: 12