Nutrient limitation of phytoplankton in five impoundments on the Manyame River, Zimbabwe

Tendaupenyu, Pamela

doi:10.4314/wsa.v38i1.12

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…In as much, several studies estimate primary production in lakes integrating chlorophyll a concentrations as a proxy for phytoplankton biomass (standing crop) and trophic state (Carlson, 1977). Needless to say there is extended debate over whether nitrogen (N) or phosphorus (P) is the nutrient that ultimately determines productivity in tropical shallow lakes (Schindler, 1977;Vollenweider and Kerekes, 1980;Reynolds, 1999;Lewis and Wurtsbaugh, 2008;Sterner, 2008;Tendaupenyu, 2012). Although the nature of limiting factors can vary spatially and temporally within individual lakes (Piontkovski et al, 1995), the dissimilarity in nitrogen and phosphorus concentrations we recorded among pelagic and littoral sites in tandem with a lack of a significant predictor variable among Secchi depth, TN, TP towards chlorophyll a production in Manjirenji Dam, reflect the complex interplay of internal mechanisms and influence of external forces on nutrient stoichiometry in lakes (Wetzel, 2001).…”

Section: Phytoplankton Community Composition and Chlorophyll A Producmentioning

confidence: 99%

Plankton and Macroinvertebrate Community Composition in the Pelagic and Non-Vegetated Littoral Drawdown Zones of a Shallow Reservoir, Manjirenji, Zimbabwe

Utete¹

2017

Appl Ecol Env Res

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Abstract. We examined the influence of physicochemical variables on zooplankton, phytoplankton and macroinvertebrate community composition in a shallow dam, Manjirenji in Zimbabwe. And further explored the relations between selected water parameters on chlorophyll a production as a proxy for phytoplankton biomass in the non-vegetated littoral drawdown zone in comparison to the pelagic zone. We observed high similarity overlaps between some water parameters, and a uniform dominance pattern of zooplankton comprising of rotifers > copepods > cladocera in littoral and pelagic sites, though the dominance order for phytoplankton varied significantly between lake zones. Pollution sensitive macroinvertebrate families dominated in the non-littoral vegetated drawdown zone. Physicochemical variables account for low plankton (50.37%) and macroinvertebrates (59.59%) ecogeography suggesting the influence of latent (unexplored) environmental and biotic factors on plankton and macroinvertebrate community composition in this lake. There was no significant predictor factor among Secchi depth, total nitrogen, and total phosphorus towards chlorophyll a production in the Dam. Non-vegetation in littoral drawdown zones of the shallow turbid lake reduce habitat complexity conferring functional and structural similarity with the pelagic zone. There is a need to comprehend transitional nutrient and water hydrodynamics and their effects on aquatic biodiversity in shallow lakes.

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Section: Phytoplankton Community Composition and Chlorophyll A Producmentioning

confidence: 99%

Plankton and Macroinvertebrate Community Composition in the Pelagic and Non-Vegetated Littoral Drawdown Zones of a Shallow Reservoir, Manjirenji, Zimbabwe

Utete¹

2017

Appl Ecol Env Res

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“…Both are susceptible to pollution originating from the city of Harare. With the construction of Lake Chivero in 1953, this reservoir took over the role of water supply from Cleveland and Seke Reservoirs (Tendaupenyu, 2012).…”

Section: Study Areamentioning

confidence: 99%

“…1) and was built as the principal water supplier for the city of Harare (Dalu et al, 2011). The lake has a long history of water quality problems mainly as a result of sewage effluent discharge from Harare and Chitungwiza into its main tributaries (Tendaupenyu, 2012). Cleveland Reservoir was constructed in 1913 and is located within the headwaters of the Mukuvisi River, a tributary of the Manyame River (Fig.…”

Section: Study Areamentioning

confidence: 99%

A test of the Lake Habitat Survey method in Cleveland Reservoir and Lake Chivero (Manyame River Basin, Zimbabwe)

Dalu

Tambara

Chari

et al. 2016

WSA

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The Lake Habitat Survey (LHS) method has only been applied once in a tropical African reservoir and could potentially be a useful tool for hydromorphological impact assessments. This study (October 2012) tested the application of the LHS method to two Zimbabwean reservoirs, Cleveland and Chivero, which are impacted differently by human activities within their catchments with varying levels of physical impacts and lakeshore use. The Lake Habitat Quality Assessment (LHQA) and Lake Habitat Modification Score (LHMS) were used to assess the habitat quality and the magnitude of human impact on the reservoirs. Cleveland Reservoir LHQA (78 out of 112) and LHMS (16 out of 42) scores are indicative of relatively low human pressure (e.g. angling and canoeing). Results show that although Cleveland Reservoir is coming under increasing anthropogenic pressure, it does not appear to suffer from major alien plant invasion as compared to Lake Chivero, which scored 62/112 and 32/42 for the LHQA and LHMS, respectively. There were no significant differences between the numbers of vegetation layers in the riparian vegetation of the two reservoirs. However, there were significant differences in the number of macrophyte species and shoreline/riparian pressures between the two reservoirs. In conclusion, the use of the LHS can better enhance quality and reliability of lake hydromorphological assessments in tropical systems, where such an investigation is required to support decision making, after adaptations of the method have been made, i.e., inclusion of catchment impacts on lakes and reservoirs in LHS scoring metrics.

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“…The town is built on a rugged and hilly terrain bisected by many streams that drain into Manyame River. Manyame River rises near the Marondera town about 65 km east of Harare, flows in an east -west direction until it reaches Lake Cabora-Bassa on the Zambezi River in Mozambique [15]. Manyame River is one of the country's major rivers and Chinhoyi is located in the Middle Manyame Catchment.…”

Section: Description Of Study Area and Sampling Pointsmentioning

confidence: 99%

Impacts of Untreated Sewage Discharge on Water Quality of Middle Manyame River: A Case of Chinhoyi Town, Zimbabwe

Muisa-Zikali¹,

Shumirai²,

Zelma³

et al. 2015

IJEMA

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Disposal of untreated sewage into surface waters is common in most developing countries. Any physico-chemical, or biological condition that prevents the designated uses of a water body represents poor water quality. This study was carried out on Middle Manyame River, a major source of potable water in Chinhoyi town. The study sought to ascertain the impacts of discharging untreated sewage on the water quality of Middle Manyame River. The following parameters were determined using APHA standard methods; nitrates, phosphates, pH, temperature, dissolved oxygen (DO), total dissolved solids (TDS), and biological oxygen demand (BOD). Sampling was done in November 2013, March 2014, and May 2014. All the parameters, except for pH and temperature, exceeded acceptable water quality standards for the sites downstream of the sewage discharge points. This indicated that the improper sewage discharge was the major contributor to poor water quality, among other activities such as agricultural runoff. It was concluded from the study that sewage effluent from the Municipality of Chinhoyi sewage works was mainly responsible for pollution along Middle Manyame River. This pollution has also put the river at risk of eutrophication. It was recommended that there should be rehabilitation and upgrading of sewage systems in Chinhoyi.

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Nutrient limitation of phytoplankton in five impoundments on the Manyame River, Zimbabwe

Cited by 16 publications

References 17 publications

Plankton and Macroinvertebrate Community Composition in the Pelagic and Non-Vegetated Littoral Drawdown Zones of a Shallow Reservoir, Manjirenji, Zimbabwe

Plankton and Macroinvertebrate Community Composition in the Pelagic and Non-Vegetated Littoral Drawdown Zones of a Shallow Reservoir, Manjirenji, Zimbabwe

A test of the Lake Habitat Survey method in Cleveland Reservoir and Lake Chivero (Manyame River Basin, Zimbabwe)

Impacts of Untreated Sewage Discharge on Water Quality of Middle Manyame River: A Case of Chinhoyi Town, Zimbabwe

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