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Ecological studies of benthic macro_ invertebrates from a sediment along gradient in the Awash River, Ethiopia

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dc.contributor.advisor Mengistou, Seyoum (Professor)
dc.contributor.author Mohammed, Zahra
dc.date.accessioned 2018-07-24T06:51:32Z
dc.date.available 2018-07-24T06:51:32Z
dc.date.issued 2017-01
dc.identifier.uri http://localhost:80/xmlui/handle/123456789/9909
dc.description.abstract Macro_ invertebrates are good indicators of human land use impacts because they are sensitive to habitat alterations. The present study aimed at assessing the ecological impacts of sediment loading on macro-invertebrates with the view to develop sediment sensitive invertebrate index (PSI) along the gradient of Awash River, Ethiopia. Three sampling sites were selected along the gradient of Awash River for evaluation of physicochemical parameters, soil particle size, organic matter and determination of the richness and diversity of macro-invertebrates. Macro_ invertebrates were collected using standard dip net based on Rapid Bio Assessment Protocols for use in streams and wadeable rivers from the same kinds of microhabitats (pools and vegetated areas)and identified to the family level. Alongside, on site of measurement of Physico chemical parameters (To,DO,pH and Conductivity ) were taken. The results indicated that concentrations of dissolved oxygen, temperature, pH, conductivity, Nitrite and Nitrate showed significant difference among samplingsites (ANOVA),(P< 0.05). The percentage abundance of families of macro_ invertebrates was determined from all sites. Total of 19 families comprising 7,094 individuals were identified from all the sites. The sediment sensitivity result indicated that site one (S1)was moderately sedimented and had the highest family richness, while site three (S3) was heavily sedimented with the least family richness. Macro_ invertebrate which indicated moderately sedimented sites are Baetidae and Lepidostomatidae whereas for heavily sedimated site Hydrophilidae and Lymnaeidae were dominant. The study indicated significant effect of different levels of sedimentation on macro-invertebrate community structure.As the sediment emanated from the degraded Awash catchment, there is need toprevent and control the ever-increasing degradation of the water quality of this ecologically and economically important river. Key words: Awash River, Bio indicators, Macro _invertebrate, PSI; RDA, Sedimentation. en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Awash River en_US
dc.subject Bio Indicators en_US
dc.subject Macro _Invertebrate en_US
dc.subject PSI en_US
dc.subject RDA en_US
dc.subject Sedimentation en_US
dc.title Ecological studies of benthic macro_ invertebrates from a sediment along gradient in the Awash River, Ethiopia en_US
dc.type Thesis en_US

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