Nutrients dynamics and trophic status of lake Kenyir

Information about nutrients dynamics is very important for the lake’s productivity and ecosystem. Such information is lacking in the case of lake Kenyir, which is the largest man-made lake in Malaysia. A 12-month study (Jan-Dec 2017) was conducted to understand spatio-temporal nutrients dynamics and...

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Main Authors:	Mohd Salleh, Ahmad Fathi, Rahman, Mohammad Mustafizur, Yunus, Kamaruzzaman, Mispan, Muhamad Radzali
Format:	Conference or Workshop Item
Language:	English
Published:	2017
Subjects:	SH151 Aquaculture - Fish Culture
Online Access:	http://irep.iium.edu.my/61365/ http://irep.iium.edu.my/61365/ http://irep.iium.edu.my/61365/1/Nutrients%20dynamics%20and%20trophic%20status%20of%20lake%20Kenyir.pdf

id	iium-61365
recordtype	eprints
spelling	iium-613652018-01-09T07:13:12Z http://irep.iium.edu.my/61365/ Nutrients dynamics and trophic status of lake Kenyir Mohd Salleh, Ahmad Fathi Rahman, Mohammad Mustafizur Yunus, Kamaruzzaman Mispan, Muhamad Radzali SH151 Aquaculture - Fish Culture Information about nutrients dynamics is very important for the lake’s productivity and ecosystem. Such information is lacking in the case of lake Kenyir, which is the largest man-made lake in Malaysia. A 12-month study (Jan-Dec 2017) was conducted to understand spatio-temporal nutrients dynamics and trophic status of the lake Kenyir. The study was conducted in three sampling zones (downstream, middle and upstream) in the Tekak river located northeast of lake Kenyir. Each sampling zone was subdivided into three sampling sites, which were considered as replications. The distance between any two sampling sites was approximately 500 m. A series of water quality parameters (temperature, dissolved oxygen, pH, conductivity, nitrate-nitrogen, nitrite-nitrogen and ammonia-nitrogen, phosphate-phosphorous and chlorophyll-a) and trophic status were determined monthly in each sampling site. Results indicate that all water quality parameters remained within expected ranges for aquatic animal particularly for fish. According to Malaysian National Water Quality Standards, most of the water quality parameters are in class I. All water quality parameters significantly (p<0.05) changed over time, showing peaks at different sampling days. All water quality parameters (except total suspended solid and turbidity) in all sampling zone were statistically similar (p>0.05). Both total suspended solid and turbidity decreased from upstream to downstream. Chlorophyll-a showed two low value loops: one from March to May and another from August to December. The highest chlorophyll-a was observed in June compared to other months. A significant negative correlation (r=-0.29, p<0.01) was observed between chlorophyll-a and temperature. TRIX index significantly changed over time. It indicates that water of lake Kenyir was oligotrophic (low productive) with low nutrients concentrations. The results of this study are very important for regular ecological monitoring and conservation of the lake. A proper management can improve the productivity of this lake. 2017 Conference or Workshop Item NonPeerReviewed application/pdf en http://irep.iium.edu.my/61365/1/Nutrients%20dynamics%20and%20trophic%20status%20of%20lake%20Kenyir.pdf Mohd Salleh, Ahmad Fathi and Rahman, Mohammad Mustafizur and Yunus, Kamaruzzaman and Mispan, Muhamad Radzali (2017) Nutrients dynamics and trophic status of lake Kenyir. In: 6th International Conference on Advancement in Science and Technology (iCAST 2017), 8th-9th August 2017, Kuantan, Pahang. http://www.icastfishing.org/icast-2017-highlights/
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	SH151 Aquaculture - Fish Culture
spellingShingle	SH151 Aquaculture - Fish Culture Mohd Salleh, Ahmad Fathi Rahman, Mohammad Mustafizur Yunus, Kamaruzzaman Mispan, Muhamad Radzali Nutrients dynamics and trophic status of lake Kenyir
description	Information about nutrients dynamics is very important for the lake’s productivity and ecosystem. Such information is lacking in the case of lake Kenyir, which is the largest man-made lake in Malaysia. A 12-month study (Jan-Dec 2017) was conducted to understand spatio-temporal nutrients dynamics and trophic status of the lake Kenyir. The study was conducted in three sampling zones (downstream, middle and upstream) in the Tekak river located northeast of lake Kenyir. Each sampling zone was subdivided into three sampling sites, which were considered as replications. The distance between any two sampling sites was approximately 500 m. A series of water quality parameters (temperature, dissolved oxygen, pH, conductivity, nitrate-nitrogen, nitrite-nitrogen and ammonia-nitrogen, phosphate-phosphorous and chlorophyll-a) and trophic status were determined monthly in each sampling site. Results indicate that all water quality parameters remained within expected ranges for aquatic animal particularly for fish. According to Malaysian National Water Quality Standards, most of the water quality parameters are in class I. All water quality parameters significantly (p<0.05) changed over time, showing peaks at different sampling days. All water quality parameters (except total suspended solid and turbidity) in all sampling zone were statistically similar (p>0.05). Both total suspended solid and turbidity decreased from upstream to downstream. Chlorophyll-a showed two low value loops: one from March to May and another from August to December. The highest chlorophyll-a was observed in June compared to other months. A significant negative correlation (r=-0.29, p<0.01) was observed between chlorophyll-a and temperature. TRIX index significantly changed over time. It indicates that water of lake Kenyir was oligotrophic (low productive) with low nutrients concentrations. The results of this study are very important for regular ecological monitoring and conservation of the lake. A proper management can improve the productivity of this lake.
format	Conference or Workshop Item
author	Mohd Salleh, Ahmad Fathi Rahman, Mohammad Mustafizur Yunus, Kamaruzzaman Mispan, Muhamad Radzali
author_facet	Mohd Salleh, Ahmad Fathi Rahman, Mohammad Mustafizur Yunus, Kamaruzzaman Mispan, Muhamad Radzali
author_sort	Mohd Salleh, Ahmad Fathi
title	Nutrients dynamics and trophic status of lake Kenyir
title_short	Nutrients dynamics and trophic status of lake Kenyir
title_full	Nutrients dynamics and trophic status of lake Kenyir
title_fullStr	Nutrients dynamics and trophic status of lake Kenyir
title_full_unstemmed	Nutrients dynamics and trophic status of lake Kenyir
title_sort	nutrients dynamics and trophic status of lake kenyir
publishDate	2017
url	http://irep.iium.edu.my/61365/ http://irep.iium.edu.my/61365/ http://irep.iium.edu.my/61365/1/Nutrients%20dynamics%20and%20trophic%20status%20of%20lake%20Kenyir.pdf
first_indexed	2023-09-18T21:27:03Z
last_indexed	2023-09-18T21:27:03Z
_version_	1777412261167497216

Nutrients dynamics and trophic status of lake Kenyir

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