AAU Institutional Repository

Assessment of the Ecological Impacts of Floriculture Industries Using Physico-Chemical Parameters and Benthic Macroinvertebretes Metric Index along Wedecha River, Debrezeit, Ethiopia

Show simple item record

dc.contributor.advisor Leta, Seyoum (PhD)
dc.contributor.author Tamiru, Misganaw
dc.date.accessioned 2018-07-09T07:14:59Z
dc.date.available 2018-07-09T07:14:59Z
dc.date.issued 2007-07
dc.identifier.uri http://localhost:80/xmlui/handle/123456789/7200
dc.description.abstract Wedecha River is one of floriculture industry sites in Debrezeit. Wedecha River is important for agriculture and domestic activities (eg, drinking, washing etc.) of the surrounding people. It is exposed to waste water discharge of the floriculture industries and disturbance of the aquatic ecosystem. Biological and chemical information was used to assess the quality of water and its impact on aquatic life and the ecology of the river. A total of 6 sites, one reference site less impaired to represent natural conditions from upstream, and 5 impaired sites in the downstream were sampled for macroinvertebrates and physicochemical parameters in the Wedecha River from November 2006 to May 2007 to assess the quality of water, ecology of the river and impact on aquatic life. Impaired sites data were compared to reference conditions. Ten physicochemical parameters pH, TO, EC, COD, BOD5, S2-, SO4 2-, PO4 3-, NH3-N and NO3-N were used to assess their impact on river ecology and correlate with macroinvertabrates. There were significant differences in most of the Physicochemical parameters (p<0.05) between reference and impaired sites. 18 metrics representing richness, composition and tolerance/intolerance measures were considered for the index development. Of these, 7 metrics were found to be useful because they give unique information in the reference site with impaired sites. The metrics used for the development of index were total number of taxa, number of Mollusca, percent Hemiptera, percent Chironomidae, percent Coleoptera, percent Mollusca and percent dominant taxon. The metrics were scored on a continuous scale from 0 (poor) to 10 (good) using the upper and lower threshold of their distribution in the reference and impaired sites. For the development of Wedecha river index, scales were added to produce a score from 0-100. The index was divided into four classes; greater than 75 was very good (S0=100), 50-74.9 was good (no metric in this division), 25- 49.9 was poor (S5=44) and less than 24.9 was very poor (S1, S2, S3 and S4 with a MI score of 13.4, 5.4, 3.6, and 9.3, respectively). The MI was effective for distinguishing impacted sites. Pearson Correlation Analysis showed that metrics expected to decrease with perturbation had strong negative relationship with nutrients and organic loading. The metric index were significantly correlated (p<0.05) to most physiochemical parameters. Change in macroinvertebrates diversity and abundance was attributed to low dissolved oxygen, nutrient enrichment and availability of food. Therefore, floriculture industries wastewater discharged ix to the nearby rivers has enormous effect on the degradation of the ecosystem. To sustain the ecological conditions of the nearby rivers, wastewater treatment and environmental audit are suggested. Environmental assessment and environmental auditing enables the floriculturist to keep humans and the environment safe. Taking care of workers, soil, water and the environment has to be seen with great care and caution because it is difficult to maintain a healthy community and carry out development in a degraded environment en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Assessment of the Ecological Impacts en_US
dc.subject of Floriculture Industries Using en_US
dc.title Assessment of the Ecological Impacts of Floriculture Industries Using Physico-Chemical Parameters and Benthic Macroinvertebretes Metric Index along Wedecha River, Debrezeit, Ethiopia en_US
dc.type Thesis en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search AAU-ETD


My Account