An examination of the effects of nutrients on the water quality of shallow rivers

Wong, S. L.; Clark, Bev J.; Kosciuw, R. F.

doi:10.1007/bf00023627

Cited by 10 publications

(5 citation statements)

References 29 publications

(17 reference statements)

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“…2). These observations support the belief that anthropogenic nutrient loading to aquatic systems increases macrophyte production (Wong, Clark & Kosciuw, 1979;Werner & Weise, 1982) and are consistent with reports of effluent-enhanced growth of submerged vegetation in the Tees River, England (Butcher, 1933), the Great Stour River, England (Fox, Malati & Perry, 1989), and the Bow River, Alberta (Chambers et al, 1991). Ozimek (1978) observed a similar pattern in macrophyte abundance in Mikołajskie Lake, Poland, where plant biomass was highest at intermediate distances away from a municipal sewage outfall.…”

Section: Discussionsupporting

confidence: 86%

Macrophyte growth and sediment phosphorus and nitrogen in a Canadian prairie river

Carr

1998

Freshwater Biology

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1. The role of sediment phosphorus (P) and nitrogen (N) in regulating growth of rooted macrophytes in a Canadian prairie river was investigated by means of in situ observations and artificial stream fertilization experiments. 2. Biomass and percentage cover of rooted macrophytes in the South Saskatchewan River increased downstream of a municipal sewage treatment plant, with maximum abundance occurring between 25 and 100 km downstream of the outfall. Biomass in the river was related to sediment P but not N concentration, although sites of maximum biomass did not coincide with sites of maximum sediment P concentration. 3. Artificial stream experiments revealed that while biomass was unaffected by addition of N to the sediment, it was enhanced by the addition of P to sediments, and further enhanced with the addition of N and P together, indicating a primarily P‐limited system, with secondary N limitation when P is in excess. 4. Macrophyte biomass increased linearly with increasing sediment P concentration in the artificial streams, and tissue P concentration peaked at ≈ 400 μg g–1. Biomass did not respond to increasing sediment N concentration, and only a weak relationship was observed between tissue N and sediment N, with maximum tissue N corresponding to ≈ 140 μg g–1 sediment exchangeable N. 5. A lack of concurrence between the sediment P concentration producing maximum biomass and tissue P concentration in situ vs. under experimental conditions indicates that other environmental factors have an important role in regulating macrophyte growth in rivers. Thus, while nutrient control may be one element in a river macrophyte control programme, a holistic ecosystem approach should be adopted to account for the other factors that may affect the growth of rooted plants.

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Section: Discussionsupporting

confidence: 86%

Macrophyte growth and sediment phosphorus and nitrogen in a Canadian prairie river

Carr

1998

Freshwater Biology

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“…In addition, many physical and chemical reactions in water may affect the content of dissolved oxygen. The diurnal amplitude of DO in aquatic system is, in fact, mainly due to biotic functions (Wong et al 1979). The high DO value in September was possibly due to photosynthesis by the luxurious growth of plants.…”

Section: Resultsmentioning

confidence: 99%

Ecological Conditions of a Temporary Wetland in Bangladesh

et al. 2013

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Investigation has been done to gain evidence on certain chemical properties of water and vegetation in area representative of the various wetland habitats which go under water during rainy season. The measurements were done with edaphic condition, water chemistry, and floristic composition. Water was neutral to alkaline and pH varied from 6.97 to 7.20 and conductivity was in the range of 97.5 m mhos to 240 m mhos. Seasonal variation of chloride content was observed throughout the year and the highest chloride (104.96 mg/l) was in the month of October. Dissolved oxygen concentration was very low (2.99 mg/l) in the month of October. With the decrease of water, the value of alkalinity became double (76.0 mg/). No distinct variation in the content of hardness was observed in the three different locations. Temporary hardness varied from 0.1 0 to 0.56 mg/l. High value of total solids in the month of July (70 mg/l) indicated that high amount of sediment are coming with the flow of water from upstream. Total suspended solids were higher than dissolved solids. Exchangeable cations were low in the beginning and an increasing tendency of Na and Ca was observed in the later stages of marsh formation. DOI: http://dx.doi.org/10.3126/eco.v18i0.9413Ecoprint: An International Journal of EcologyVol. 18, 2011 Page: 71-76 Uploaded date: 12/22/2013

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“…This continuous decline in DO over the years points to an alarming situation as DO levels less than 3 mg/l are fatal to most fish (Wilson, 2010). Various factors like the introduction of common carp and its excessive growth, sewage inflow, anthropogenic influences and decomposition at bottom may be responsible for reduction in DO concentration and increased free carbon dioxide in water body (Munawar, 1970;Bohra and Bhargava, 1976;Wong et al, 1979;Chandrakiran, 2011).…”

Section: Dissolved Oxygen and Free Carbon Dioxide Concentrationsmentioning

confidence: 99%

Long Term Assessment of Water Quality Changes in lake Mansar, A Ramsar Site (J,K, India)

Sharma¹,

Tjprc²

2019

IJEEFUS

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Freshwater resources are indispensable for the survival of all major life forms on earth but their quality has deteriorated due to various human activities. This study reports long term changes in the water quality of a Ramsar site, Lake Mansar located in the Indian state of Jammu and Kashmir. For this, four sampling sites were marked and various water quality parameters were analysed following standard methodology on a seasonal basis for one year and compared with three separate sets of published and unpublished data spanning a period of about 25 years. Results indicated that increased anthropogenic activities have certainly altered the water quality of Lake Mansar with deterioration in some water quality parameters. However, a comparison with standard values recommended for drinking water by international organisations suggested that all the parameters were within the recommended limits.1971, is an international effort to identify and protect the wetlands having ecological importance.One such Ramsar site located in lower Himalayas is lake Mansar that is socially and ecologically important but is under immense anthropogenic stress. Lake Mansar is a sub-tropical, rural closed lacustrine system without any surface channels and its main sources of water are subterranean springs and surface runoff. It is regarded a holy site from mythological period and thus holds a special position in the cultural and social sphere of the local population. It was given the status of Ramsar site owing to its ecological importance as it provides habitat and breeding ground for fishes and other aquatic life and many migratory birds visit the lake during winter. The lake also provides habitat to two important species of turtles, Lissemys punctata and Trionyx gangeticus, listed in CITES-IUCN Red list 2003 and very rare medusa, Mansariella lacustris. Owing to its domestic, religious, cultural Impact Factor (JCC): 4.6869 NAAS Rating: 3.58and recreational importance, the lake is being subjected to very high anthropogenic pressure. Performance of religious practices, increased tourism activities accompanied by developmental activities like construction of shops, restaurants, roads, boating station, view points, etc, adds to the pressure exerted by the local inhabitants. This increased pollution of

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An examination of the effects of nutrients on the water quality of shallow rivers

Cited by 10 publications

References 29 publications

Macrophyte growth and sediment phosphorus and nitrogen in a Canadian prairie river

Macrophyte growth and sediment phosphorus and nitrogen in a Canadian prairie river

Ecological Conditions of a Temporary Wetland in Bangladesh

Long Term Assessment of Water Quality Changes in lake Mansar, A Ramsar Site (J,K, India)

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