ﮐﺎراﯾﯽ ﺣﺬف ﺳﻠﻮلﻫﺎي ﺟﻠﺒﮑﯽ ﻣﻀﺮ ﺑﺎ ﻏﻠﻈﺖﻫﺎي ﻣﺨﺘﻠﻒ دوﻏﺎب ﺧﺎك رس

The removal efficiency harmful algal cells of clay slurry with different concentrations

داﯾﻨﻮﻓﻼژﻻﻫﺎ ﮔﺮوه ﻣﻬﻤﯽ از ﻓﯿﺘﻮﭘﻼﻧﮑﺘﻮنﻫﺎي درﯾﺎﯾﯽ ﻣﯽﺑﺎﺷﻨﺪ ﮐﻪ ﺷﮑﻮﻓﺎﯾﯽ ﺑﺮﺧﯽ از ﮔﻮﻧﻪﻫﺎي آن ﻣﺸﮑﻼت زﯾﺎدي را ﺑﺮاي اﮐﻮﺳﯿﺴﺘﻢﻫﺎي درﯾـﺎﺋﯽ و ﻓﻌﺎﻟﯿـﺖ ﻫـﺎي آﺑـﺰي ﭘـﺮوري اﯾﺠـﺎد ﻣـﯽ ﻧﻤﺎﯾـﺪ . ﺷـﮑﻮﻓﺎﺋﯽ ﻧﺎﺷـﯽ از Cochlodinium polykricoides ﻃﯽ ﺳﺎلﻫﺎي 1387-1388 ﺧﺴﺎرات ﺷﺪﯾﺪي ﺑﺮ آﺑﺰﯾﺎن ﺧﻠﯿﺞ ﻓﺎرس و درﯾﺎي ﻋﻤﺎن وارد ﻧﻤﻮد. ﺟﻬـﺖ ﮐﻨﺘﺮل ﮐﺸﻨﺪ ﻗﺮﻣﺰ روشﻫﺎي ﻣﺨﺘﻠﻔﯽ اﺳﺘﻔﺎده ﻣﯽﺷﻮد. از اﯾﻨﺮو اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﺑﺮرﺳﯽ درﺻﺪ ﮐﺎراﯾﯽ ﺣـﺬف ﺳـﻠﻮﻟﯽ ﺑـﺎ ﻏﻠﻈﺖﻫﺎي ﻣﺨﺘﻠﻒ دوﻏﺎب ﺧﺎك رس )0/5، 1، 2، 4 و10 gr/l( ﭘﺮداﺧﺖ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر ﭘـﺲ از ﺟﺪاﺳـﺎزي دو ﮔﻮﻧـﻪ C.polykricoides وProtoperidinium quinquecorne از آب درﯾﺎ )ﺑﺎ ﺗﺮاﮐﻢ cell/ml 14000-16000(، ﺑﺎ اﻓﺰودن ml 50 از ﻏﻠﻈﺖﻫﺎي ﻣﺨﺘﻠﻒ دوﻏﺎب ﺑﻪ ﻇﺮوف ﺣﺎوي ﺟﻠﺒﮏ، ﺑﻌﺪ از ﮔﺬﺷﺖ زﻣـﺎن ﻫـﺎي 2، 4، 20 و 24 ﺳـﺎﻋﺖ ﺗـﺮاﮐﻢ ﺳﻠﻮلﻫﺎ ﺷﻤﺎرش ﮔﺮدﯾﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد در رﯾﺰﺟﻠﺒﮏ C.polykricoides ﺑﻬﺘﺮﯾﻦ ﮐﺎراﯾﯽ ﻏﻠﻈﺖﻫﺎي gr/l 4 و10 ﺑﻌﺪ از 24 ﺳﺎﻋﺖ ﺑﺎ ﻣﯿﺎﻧﮕﯿﻦ 99 درﺻﺪ داﺷﺘﻨﺪ. ﭘﺲ از آن ﺗﯿﻤﺎر gr/l 0/5 در زﻣﺎن 2 ﺳـﺎﻋﺖ 53 درﺻـﺪ ﮐـﺎﻫﺶ ﺳـﻠﻮل ﻫـﺎ ي ﺟﻠﺒﮑﯽ را ﺑﺎﻋﺚ ﺷﺪ. ﺑﻬﺘﺮﯾﻦ درﺻﺪ ﮐﺎراﯾﯽ ﺣﺬف ﺳﻠﻮﻟﯽ ﺑﺮرﺳﯽ ﺷﺪه روي P.quinquecorne ، ﻣﯿﺎﻧﮕﯿﻦ 99 درﺻﺪ را در ﺗﯿﻤﺎر gr/l 4 در زﻣﺎن 24 ﺳﺎﻋﺖ داﺷﺖ ﮐﻪ اﺧﺘﻼف ﻣﻌﻨﯽ داري ﺑﺎ ﺗﯿﻤﺎرﻫﺎي gr/l 4 و10 در زﻣﺎنﻫـﺎي دﯾﮕـﺮ ﻧﺸـﺎن ﻧﺪاد )0/05≥p(. از اﯾﻨﺮو ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻨﮑﻪ اﻓﺰودن دوﻏﺎب ﺑﺎﯾﺴﺘﯽ ﮐﻤﺘﺮﯾﻦ ﺗﺄﺛﯿﺮ زﯾﺴﺖ ﻣﺤﯿﻄﯽ و آﺳﯿﺐ ﺑﻪ اﮐﻮﺳﯿﺴﺘﻢ و ﻣﻮﺟﻮدات را داﺷﺘﻪ ﺑﺎﺷﺪ ﺑﺴﺘﻪ ﺑﻪ ﻧﻮع ﮔﻮﻧﻪ ﻫﺪف ﺗﻐﯿﯿﺮﭘﺬﯾﺮ ﻣﯽﺑﺎﺷﺪ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻧﺘﺎﯾﺞ ﺑﺪﺳﺖ آﻣﺪه، ﻏﻠﻈﺖ gr/l 4 ﺑﺮاي P.quinquecorne و gr/l 0/5 ﺑﺮاي C.polykricoides ﭘﯿﺸﻨﻬﺎد ﻣﯽﮔﺮدد.

Dinoflagellates are an important group of marine phytoplankton whose blooms of some species causes great problems for marine ecosystems and aquaculture activities. The bloom due by Cochlodinium polykricoides during 2008-2009 caused severe damage to aquatic animals in the Persian Gulf and the Oman Sea. Therefore, this study was investigating the removal efficiency of algal cell with different concentrations of clay slurry (0.5, 1, 2, 4 and 10 gr/l). therfore, after separating C.polykricoides and Protoperidinium quinquecorne from seawater (with cell density of 16000-14000), by adding 50 ml of different concentrations of clay slurry, cell density Was counted after 2, 4, 20 and 24 hours. The results showed that in C.polykricoides microalgae, the best performance of 4 and 10 gr / l concentrations after 24 hours were 99%. So after 4 and 10 gr/l algal cells density was reduced to 53% in 0.5 gr / l and in 2 hours. The best removal effeciency in this study on P. quinquecorne had 99% in 4 gr / l at 24 hours, which did not show a significant difference with 4 and 10 gr / l at other times (p≥0.05). Therefore, considering that the addition of clay slurry should have the least environmental impact and damage for ecosystem and organisms, the clay slurry concentration is variable depending on the type of target species. According to the results, clay slurry concentration 4 gr/l for P.quinquecorne and 0.5 gr/l for C.polykricoides are recommended.