Alamrew, Amare Mezgebu (2017) Stressor Based Water Quality Assessment Using Benthic Macroinvertebrates as Bioindicators in Streams and Rivers Around Sebeta, Ethiopia. Masters thesis, Addis Ababa University.
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PDF (Stressor Based Water Quality Assessment Using Benthic Macroinvertebrates as Bioindicators in Streams and Rivers Around Sebeta, Ethiopia)
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Abstract
The increasing impact of human activities on the freshwater bodies of Ethiopia calls for efficient and cost effective method for water quality and ecological health assessment. Benthic macroinvertebrates are important group of aquatic invertebrates to show the level of degradation of aquatic ecosystems and in this study they were used to assess the impact of different stressors originating from industries (tannery, alcohol, brewery and textile factories) and agricultural activities on streams and rivers around Sebeta. A total of 27 benthic macroinvertebrates taxa (20 families, 1 genus and 6 species) were collected from nine sampling sites in four streams, representing different anthropogenic activates. From these, Family Planariidae, Caenidae, Baetidea, Hydropsychidae, Gyrinidae, Dystiscidae, Hydrophilidae, Naucoridae and Corixidae were distributed mostly from reference site to minimally impacted upstream sampling sites and considered as indicators of minimally impacted streams and rivers. Family Syrphidae and Thiaridae were dominant in streams with high turbidity and can be an indicator of turbid streams and rivers. Family Chironomidae, Lymnaeidae and Oligochaeta were dominant in highly polluted sites (brewery and textile effluent receiving sites) and can be indicator of highly polluted streams and rivers. From lower taxonomic level of Family Chironomidae, Chironomus alluaudi and Chironomus imicola were dominant in highly polluted sites (brewery and textile effluent receiving sites), and considered as an indicator of highly polluted streams and rivers. The distribution of Polypedilum wittei, Polypedilum bipustulatem and Dicrotendipus septemmaculatus were high in moderately impacted sites and considered as indicators of moderately polluted streams and rivers. The genus Conchapelopia and Chironomus cliptres were mostly distributed in reference and less impacted upstream sampling sites and can be indicators of good water quality. Metrics composed of sensitive group of taxa (No. of Ephemeroptera, No. CET and %ET) were able to differentiate reference sites, agricultural impacted sites and some instream activities (washing/bathing and cattle watering site). Metrics composed of tolerant taxa like number of Oligochaeta individual and %Diptera individual distinguish highly impacting industrial stressors (tannery, beer, textile and alcohol). Margalefs index may detect toxic effect of industrial wastes in addition to organic pollution. Total number of ind/m2, number of Taxa (Family), ETHbios, and FBI were able to segregate stressors originated from different sources (agriculture, washing/bathing and industries). Freshwater bodies are highly deteriorated and research should focus on waste water treatment technologies and adequate waste treatment structures must be put in place at the industries and factories located along streams and rivers around Sebeta.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Bioindicator, Benthic macroinvertebrate, Chironomidae, Sebeta, Stressor |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QH Natural history > QH301 Biology Q Science > QR Microbiology |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 19 Jun 2018 14:02 |
| Last Modified: | 19 Jun 2018 14:02 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4721 |
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