Changes of water quality, chlorophyll <i>a</i> and zooplankton along the river-lacustrine continuum in a tropical reservoir

Yusoff, F. M.; Matias, H. M.; Khan, Najmus Sakib

doi:10.1080/03680770.2001.11902590

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…Significantly, higher (p < 0.05) values of oxygen concentrations (DO and DO%Sat.) during the dry season than in the rainy season is in line with the observation on six impoundments on River Oshun by Ekpenyong, H. [30] but contrast the results of Yusoff et al [31] on Kenyir Reservoir, Malaysia. Higher record of oxygen concentration during the dry season than in the rainy season as recorded in this present study could probably be due to higher photosynthetic activities during the dry season when there is normally more solar energy available to the lake than during the rainy season.…”

Section: Discussionsupporting

confidence: 91%

The Physico-Chemical Water Quality of the Obafemi Awolowo University Teaching and Research Farm Lake, O.A.U. Campus, Ile-Ife, Southwest, Nigeria

Aduwo¹,

Adeniyi²

2019

JEP

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The physico-chemical water quality of the Obafemi Awolowo University Teaching and Research Farm Lake, Ile-Ife, Nigeria, was studied over an annual cycle (September 2006 to August 2007) almost 40 years after its impoundment in 1967. This was with a view to obtaining the then current state of physico-chemical water quality parameters with their variations in time and space as well as using some of the data obtained to evaluate the aging process of the lake for the 40 years of its existence. There was no significant (p > 0.05) horizontal variation (i.e. upstream-dowstream) in the physico-chemical characteristics of the lake whereas, Apparent-color, True color, Turbidity, Total Suspended Solids (TSS), Total Solids (TS) and Total Acidity increased significantly (p < 0.05) from the lake surface towards the bottom of the lake. On the other hand, water pH, Dissolved Oxygen (DO); Dissolved Oxygen Saturation (DO% Sat.) and Biochemical Oxygen Demand (BOD 5) decreased significantly (p < 0.05) from the lake surface towards the bottom of the lake. Dissolved Oxygen (DO), Dissolved Oxygen Saturation (DO% Sat.) and Nitrate ion (3 NO −) were significantly higher (p < 0.05) in the dry season than in the rainy season while, True colour, pH, Conductivity, Total Hardness, Calcium ion (Ca 2+), Magnesium ion (Mg 2+), Potassium ion (K +) and Sulphate ion (2 4 SO −) were significantly higher (p < 0.05) in the rainy season than in the dry season. The lake water could be regarded as shallow, coloured, turbid, less transparent, slightly acidic, soft and well-buffered fresh-waterbodies with evidence of aging (i.e. transforming the lake from an oligotrophic status to a eutrophic waterbody). The results indicated that the lake is suitable for most of its applications with little or no adjustments as the case may be; except probably for drinking purposes where some microbial analysis may be necessary.

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Section: Discussionsupporting

confidence: 91%

The Physico-Chemical Water Quality of the Obafemi Awolowo University Teaching and Research Farm Lake, O.A.U. Campus, Ile-Ife, Southwest, Nigeria

Aduwo¹,

Adeniyi²

2019

JEP

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“…This was probably due to the higher availability of detrital particles in the area as well as higher oxygen concentration, higher total suspended solids and lower water transparency which may enable them to avoid predators. This compares well with the work of Yusoff et al (2002) on Kenyir Reservoir, Malaysia.…”

Section: Zooplankton Communitysupporting

confidence: 89%

Water quality and planktonic community of Owalla Reservoir, Osun State, Southwest Nigeria

et al. 2022

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Aim Owalla Reservoir, one of the largest and oldest man-made lakes in Osun State supplies potable water to many towns in the state including the state capital, Osogbo. Active fishing activities also takes place in the lake. Inspite of the importance of the reservoir, information on the planktonic community and physico-chemical water quality are scarce. Therefore, this study investigated the water quality and plankton composition of Owalla Reservoir, Osun State, Nigeria, from October 2012 to November 2013 with a view to providing baseline information on limnology of the reservoir. Methods Seven sampling stations (designated Stations 1-7) were established as representatives of the zones and regions of the reservoir and sampling was conducted quarterly. At Stations 1 and 3, only surface water samples were collected while water samples were collected from the surface, mid-depth and close to the bottom at other stations. Samples for total plankton and physico-chemical water quality were analyzed using standard methods. Results The result of the study showed that mean dissolved oxygen (P<0.001), biochemical oxygen demand, conductivity, pH (P<0.001), and alkalinity were higher at the surface of the reservoir. As regards seasonal variation, alkalinity, biochemical oxygen demand had the higher mean values during the rainy season. Also, acidity, dissolved oxygen, and pH showed significantly (P<0.001) higher values during the rainy season. One hundred and thirty-seven (137) taxa of phytoplankton and 39 taxa of zooplankton were recorded from the reservoir. The horizontal pattern of variation showed an increase in the mean abundance of most of phytoplankton groups from inflow to the dam area while vertical variation showed a decrease in mean abundance from surface to the bottom of the reservoir. Most of the phytoplankton and zooplankton taxa were more abundant during the dry season than in the rainy season. Conclusions The study concluded that all the monitored physico-chemical water quality parameters were within the guide level range as of the World Health Organisation (WHO) for drinking water, Owalla Reservoir is qualitatively rich in both phytoplankton and zooplankton and the reservoir can support a viable aquatic community and sustainable fishery production.

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“…Significantly, higher (p < 0.05) values of oxygen concentrations (DO and DO%Sat.) during the dry season than in the rainy season is in line with the observation on six impoundments on River Oshun by Ayodele & Adeniyi [32] but contrast the results of Yusoff et al [33] on Kenyir Reservoir, Malaysia. Higher record of oxygen concentration during the dry season than in the rainy season as recorded in this present study could probably be due to higher photosynthetic activities during the dry season when there is normally more solar energy available to the lake than during the rainy season.…”

Section: Discussionsupporting

confidence: 90%

The Physico-Chemical Water Quality of the Obafemi Awolowo University Teaching and Research Farm Lake, Ile-Ife, Southwest, Nigeria

Aduwo

2019

OFOAJ

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The physico-chemical water quality of the Obafemi Awolowo University Teaching and Research Farm Lake, Ile-Ife, Nigeria, was studied over an annual cycle (September 2006 to August 2007 almost 40 years after its impoundment in 1967. This was with a view to obtaining the then current state of physico-chemical water quality parameters with their variations in time and space as well as using some of the data obtained to evaluate the aging process of the lake for the 40 years of its existence. There was no significant (p > 0.05) horizontal variation (i.e. upstreamdowstream) in the physico-chemical characteristics of the lake whereas, Apparent-colour, True colour, Turbidity, Total Suspended Solids (TSS), Total Solids (TS) and Total Acidity increased significantly (p < 0.05) from the lake surface towards the bottom of the lake. In the other hand, water pH, Dissolved Oxygen (DO); Dissolved Oxygen Saturation (DO% Sat.) and Biochemical Oxygen Demand (BOD5) decreased significantly (p < 0.05) from the lake surface towards the bottom of the lake.Dissolved Oxygen (DO), Dissolved Oxygen Saturation (DO% Sat.) and Nitrate ion (NO3-) were significantly higher (p < 0.05) in the dry season than in the rainy season while, True colour, pH, Conductivity, Total Hardness, Calcium ion (Ca2+), Magnesium ion (Mg2+), Potassium ion (K+) and Sulphate ion (SO42-) were significantly higher (p < 0.05) in the rainy season than in the dry season. The lake water could be regarded shallow, colored, turbid, less transparent, slightly acidic, soft and well-buffered fresh-waterbodies with evidence of aging (i.e. transforming the lake from an oligotrophic status to a eutrophic waterbody). The results indicated that the lake is suitable for most of its applications with little or no adjustments.

show abstract

Changes of water quality, chlorophyll a and zooplankton along the river-lacustrine continuum in a tropical reservoir

Cited by 4 publications

References 5 publications

The Physico-Chemical Water Quality of the Obafemi Awolowo University Teaching and Research Farm Lake, O.A.U. Campus, Ile-Ife, Southwest, Nigeria

The Physico-Chemical Water Quality of the Obafemi Awolowo University Teaching and Research Farm Lake, O.A.U. Campus, Ile-Ife, Southwest, Nigeria

Water quality and planktonic community of Owalla Reservoir, Osun State, Southwest Nigeria

The Physico-Chemical Water Quality of the Obafemi Awolowo University Teaching and Research Farm Lake, Ile-Ife, Southwest, Nigeria

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