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عنوان فارسی مقاله:
ماکروفیتهای آبزی در دریاچه دره ریفت اتیوپی؛ غلظت عناصر کمیاب آنها و استفاده به عنوان شاخص آلودگی
عنوان انگلیسی مقاله:
Aquatic macrophytes in Ethiopian Rift Valley lakes; Their trace elements concentration and use as pollution indicators
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Macrophytes have been used as bioindicators and/or biomonitors of trace element pollution in aquatic systems. Pfeiffer et al. (1986) used stems and leaves of water hyacinth as biological monitor for critical trace metal elements discharged in Paraiba do Sul River in Brazil. Roots of water hyacinth were also used as a biological indicator of metal pollution in the basin of the River Saguala Grande, Cuba (Gonzalez et al., 1989). Concentration of trace metal elements in the roots, rhizome, stems and leaves of Phragmites australis and corresponding water and sediment were studied from mouth area of the Imera Meridionale River in Sicily, Italy (Bonanno and Lo Giudice, 2010). Positive linear relationship between trace metal elements concentration in the organs and those in water and sediment indicates potential use of such organs for pollution monitoring in water and sediments. Bonanno (2012) tested roots, stems and leaves of Arundo donax from Acquicella stream in Catania, Italy, as potential biomonitors of trace elements contamination in water and sediment. The study showed that trace elements concentration decrease with a pattern of roots > leaves > stem.Both natural and human activities have affected the water quality of lakes in the Ethiopian Rift Valley (ERV) region. Warm climate, volcanic activity (tectonics), drought, rugged terrain which result in soil erosion and hence poor vegetation cover were mentioned from the natural factors (Zinabu et al., 2002b). Human activities such as industrialization, agriculture and urbanization together with increasing human population around and near the lakes have also been reported having their influence on water quality through elevated level of contaminants (Zinabu, 1998; Zinabu and Pearce, 2003; Masresha et al., 2011). Previous research activities in the Ethiopian rift valley lakes region focused on soil, water, sediment and fish tissue samples to assess the extent of pollution with regard to selected trace elements (Zinabu, 2002; Zinabu and Pearce, 2003; Masresha et al., 2011). However, trace elements enrichment in macrophytes from water and sediments in the Ethiopian Rift Valley Lakes (Koka, Ziway and Awassa) was not investigated. Uptake of trace elements in aquatic macrophytes takes place via their roots from sediments and via their shoot from the water (Denny, 1980) and different aquatic macrophytes tend to take up trace elements in different amounts and transport them from root to shoot to varying degrees (Greger and Kautsky, 1993). In an aquatic ecosystem factors governing the bioavailability of trace elements to aquatic macrophytes include pH, redox potential, temperature, salinity, ambient element concentrations, elementscompetition for binding sites, concentration of ligands and growth form of a plant (Sparling and Lowe, 1998; Fritioff et al., 2005; Mazej and Germ, 2009). There are no documented records of the use of aquatic macrophytes as feed for animals around the studied ERV lakes (Koka, Ziway andAwassa). However, local people around these lakes move their herds close to the shores to make use of the accessible temporary pasture resulting from retreating lakes, especially during long dry seasons (personal observation). Therefore, bioaccumulation of trace elements in animals as a result offeeding contaminated forage aquatic macrophytes can be a possibility. The hypothesis of this study is that in the studied ERV lakes (Koka, Ziway andAwassa) water and sediment may act as source for trace elements and aquatic macrophytes in these lakes can indicate trace element pollution of these aquatic systems. Therefore, the objective of this study was to investigate the concentration of trace elements in lakes water, sediment and aquatic macrophytes, and assess the extent of trace element pollution of the studied lakes using macrophytes as indicators.
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کلمات کلیدی:
Ethiopia - Aquatic Plants - Food Balance Sheets, 2015 - knoema.com https://knoema.com › ... › Food Balance Sheets, 2015 › Ethiopia Ethiopia. Aquatic Plants. A food balance sheet presents a comprehensive picture of the pattern of a country's food supply during a specified reference period. [PDF]Biomass and net aboveground primary productivity of macrophytes in ... www.tropecol.com/pdf/open/PDF_55_3/03-Tamire%20&%20Mengistou.pdf by G TAMIRE - 2014 - Cited by 5 - Related articles 3Current Postal Address: P.O. Box 6, Code no.1110, Addis Ababa, Ethiopia ...... aquatic macrophytes biomass production is a function of temperature and ... Assessment of Metals Concentration in Water, Sediment and ... https://www.omicsonline.org/.../assessment-of-metals-concentration-in-water-sediment-a... Lake Hawassa; metals; water; sediment; aquatic macrophyte; SQGs. Introduction. The problems of metal pollution are currently increasing in many Ethiopian Rift ... Freshwater Ecoregions of Africa and Madagascar: A Conservation ... https://books.google.com/books?isbn=1597267910 Michele L. Thieme, Robin Abell, Neil Burgess - 2005 - Science The shores slope gradually and are muddy, with areas of Juncus vegetation. ... is at 266 m the deepest of the Ethiopian Rift lakes. It is 28 ... Only eight fish, thirteen aquatic frogs, three aquatic reptiles, twelve aquatic mollusks, and four aquatic ... Phytoremediation: Role of Aquatic Plants in Environmental Clean-Up https://books.google.com/books?isbn=8132213076 Bhupinder Dhir - 2013 - Science ... (2004) Bioaccumulation: comparison of the capacity of two aquatic macrophytes. ... Bull Chem Soc Ethiopia 26(2):181–193 Muthunarayanan V, Santhiya M, ... [PDF]nutrient uptake efficiency and growth of two aquatic macrophyte ... https://www.ajol.info/index.php/sinet/article/viewFile/127864/117404 by Y Kassa - 2014 - Related articles NUTRIENT UPTAKE EFFICIENCY AND GROWTH OF TWO AQUATIC. MACROPHYTE SPECIES UNDER CONSTRUCTED WETLANDS, ETHIOPIA.
