Changes in water quality and trophic status associated with cage aquaculture in Lake Maninjau, Indonesia
The cage aquaculture unquestionably has been degrading lake water quality by increasing nutrients and organic carbon in lake water and sediments. The question is to what extend this condition affects other key indictors such as the temporal changes in trophic status and the thickness of anoxic hypol...
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| Veröffentlicht in: | IOP conference series. Earth and environmental science 2016-01, Vol.31 (1), p.12027-12035 |
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| creator | Henny, C Nomosatryo, S |
| description | The cage aquaculture unquestionably has been degrading lake water quality by increasing nutrients and organic carbon in lake water and sediments. The question is to what extend this condition affects other key indictors such as the temporal changes in trophic status and the thickness of anoxic hypolimnion layer where the anoxic water column is moving upward pushing up the oxic epilimnion layer. The condition in Lake Maninjau could be worse since the lake is steadily producing sulfide which can cause not only oxygen depletion in the water column but also the phosphate release from the sediments. The study is based on the long term monitoring data from on going research for about 8 years observation. The results indeed show the anoxic water column is moving upward increasing the thickness of anoxic hypolimnion layer and decreasing epilimnion layer from 30 m to 10 m depth. The trophic status of the lake also has changed from mesotrophic to eutrophic decreasing the water transparency to even a critical level < 1m. The months of July to September with prolonged hot season could be the critical time for trophic condition for the lake. The results suggest that determination of these conditions further could help identify and predict the critical time for possibility of fish kill. |
| doi_str_mv | 10.1088/1755-1315/31/1/012027 |
| format | Article |
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The question is to what extend this condition affects other key indictors such as the temporal changes in trophic status and the thickness of anoxic hypolimnion layer where the anoxic water column is moving upward pushing up the oxic epilimnion layer. The condition in Lake Maninjau could be worse since the lake is steadily producing sulfide which can cause not only oxygen depletion in the water column but also the phosphate release from the sediments. The study is based on the long term monitoring data from on going research for about 8 years observation. The results indeed show the anoxic water column is moving upward increasing the thickness of anoxic hypolimnion layer and decreasing epilimnion layer from 30 m to 10 m depth. The trophic status of the lake also has changed from mesotrophic to eutrophic decreasing the water transparency to even a critical level < 1m. The months of July to September with prolonged hot season could be the critical time for trophic condition for the lake. The results suggest that determination of these conditions further could help identify and predict the critical time for possibility of fish kill.</description><identifier>ISSN: 1755-1307</identifier><identifier>EISSN: 1755-1315</identifier><identifier>DOI: 10.1088/1755-1315/31/1/012027</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Aquaculture ; Cage ; Cages ; Carbon ; Depletion ; Epilimnion ; Eutrophic environments ; Eutrophic waters ; Eutrophication ; Fish kill ; Freshwater ; Hypolimnion ; Lake sediments ; Lakes ; Nutrients ; Organic carbon ; Oxygen depletion ; Sediments ; Thickness ; Trophic levels ; Trophic status ; Water circulation ; Water column ; Water depth ; Water quality</subject><ispartof>IOP conference series. Earth and environmental science, 2016-01, Vol.31 (1), p.12027-12035</ispartof><rights>Published under licence by IOP Publishing Ltd</rights><rights>2016. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). 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Earth and environmental science</title><addtitle>IOP Conf. Ser.: Earth Environ. Sci</addtitle><description>The cage aquaculture unquestionably has been degrading lake water quality by increasing nutrients and organic carbon in lake water and sediments. The question is to what extend this condition affects other key indictors such as the temporal changes in trophic status and the thickness of anoxic hypolimnion layer where the anoxic water column is moving upward pushing up the oxic epilimnion layer. The condition in Lake Maninjau could be worse since the lake is steadily producing sulfide which can cause not only oxygen depletion in the water column but also the phosphate release from the sediments. The study is based on the long term monitoring data from on going research for about 8 years observation. The results indeed show the anoxic water column is moving upward increasing the thickness of anoxic hypolimnion layer and decreasing epilimnion layer from 30 m to 10 m depth. The trophic status of the lake also has changed from mesotrophic to eutrophic decreasing the water transparency to even a critical level < 1m. The months of July to September with prolonged hot season could be the critical time for trophic condition for the lake. The results suggest that determination of these conditions further could help identify and predict the critical time for possibility of fish kill.</description><subject>Aquaculture</subject><subject>Cage</subject><subject>Cages</subject><subject>Carbon</subject><subject>Depletion</subject><subject>Epilimnion</subject><subject>Eutrophic environments</subject><subject>Eutrophic waters</subject><subject>Eutrophication</subject><subject>Fish kill</subject><subject>Freshwater</subject><subject>Hypolimnion</subject><subject>Lake sediments</subject><subject>Lakes</subject><subject>Nutrients</subject><subject>Organic carbon</subject><subject>Oxygen depletion</subject><subject>Sediments</subject><subject>Thickness</subject><subject>Trophic levels</subject><subject>Trophic status</subject><subject>Water circulation</subject><subject>Water column</subject><subject>Water depth</subject><subject>Water quality</subject><issn>1755-1307</issn><issn>1755-1315</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>O3W</sourceid><sourceid>BENPR</sourceid><recordid>eNqFkU1rGzEQhpfSQlMnPyEg6KWHuJ7Rx2r3WEzSGhxySc9irNXGcjdaW9IS_O-zi0sKPcSnGYbnfWF4iuIa4TtCVS1QKzVHgWohcIELQA5cfygu3u4f33bQn4svKe0ASi1FfVFsl1sKTy4xH9gLZRfZYaDO5yOj0LAc-_3WW5Yy5SExSqm3fqQa9uLzlll6cozGgB26PEQ3lazpj2P3FHzY0XDDVqHpg0ueLotPLXXJXf2ds-L33e3j8td8_fBztfyxnlsFZZ6rjeOt4FWDRKoGqVSpNqBLFAQoGiG1amEjpEAg4LxVylYbsqJqqCmta8Ss-Hbq3cf-MLiUzbNP1nUdBdcPyWCNda051tV5tAKQNSLw86iuQHGQOKFf_0N3_RDD-LPhSupaa5BypNSJsrFPKbrW7KN_png0CGayaiZjZrJnBBo0J6tjDk853-__Fb-feQVJ0aHU</recordid><startdate>20160101</startdate><enddate>20160101</enddate><creator>Henny, C</creator><creator>Nomosatryo, S</creator><general>IOP Publishing</general><scope>O3W</scope><scope>TSCCA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>PATMY</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PYCSY</scope><scope>7QH</scope><scope>7TG</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H97</scope><scope>KL.</scope><scope>L.G</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope><scope>7TN</scope><scope>H96</scope></search><sort><creationdate>20160101</creationdate><title>Changes in water quality and trophic status associated with cage aquaculture in Lake Maninjau, Indonesia</title><author>Henny, C ; 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Earth and environmental science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Henny, C</au><au>Nomosatryo, S</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Changes in water quality and trophic status associated with cage aquaculture in Lake Maninjau, Indonesia</atitle><jtitle>IOP conference series. Earth and environmental science</jtitle><addtitle>IOP Conf. Ser.: Earth Environ. Sci</addtitle><date>2016-01-01</date><risdate>2016</risdate><volume>31</volume><issue>1</issue><spage>12027</spage><epage>12035</epage><pages>12027-12035</pages><issn>1755-1307</issn><eissn>1755-1315</eissn><abstract>The cage aquaculture unquestionably has been degrading lake water quality by increasing nutrients and organic carbon in lake water and sediments. The question is to what extend this condition affects other key indictors such as the temporal changes in trophic status and the thickness of anoxic hypolimnion layer where the anoxic water column is moving upward pushing up the oxic epilimnion layer. The condition in Lake Maninjau could be worse since the lake is steadily producing sulfide which can cause not only oxygen depletion in the water column but also the phosphate release from the sediments. The study is based on the long term monitoring data from on going research for about 8 years observation. The results indeed show the anoxic water column is moving upward increasing the thickness of anoxic hypolimnion layer and decreasing epilimnion layer from 30 m to 10 m depth. The trophic status of the lake also has changed from mesotrophic to eutrophic decreasing the water transparency to even a critical level < 1m. 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| subjects | Aquaculture Cage Cages Carbon Depletion Epilimnion Eutrophic environments Eutrophic waters Eutrophication Fish kill Freshwater Hypolimnion Lake sediments Lakes Nutrients Organic carbon Oxygen depletion Sediments Thickness Trophic levels Trophic status Water circulation Water column Water depth Water quality |
| title | Changes in water quality and trophic status associated with cage aquaculture in Lake Maninjau, Indonesia |
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