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IJSTR >> Volume 6 - Issue 2, February 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Assessing Ecosystem Integrity And Macroinvertebrates Community Structure: Towards Conservation Of Small Streams In Tanzania

[Full Text]



Fredrick Ojija, Mesfin Gebrehiwot, Neema Kilimba



Aquatic ecosystem, Biomonitoring, Ecosystem health, Macroinvertebrates, Streams, Water pollution, Water quality



This study attempts to use biological indices such as Biological Monitoring Working Party (BMWP), Average Score Per Taxa (ASPT) and Hilsenhoff Family Biotic Index (FBI) in order to determine the ecosystem health and water quality of Nzovwe stream in Mbeya, Tanzania. Macroinvertebrates were sampled from Nzovwe stream using semi-quantitative techniques from March to June, 2016. About 500 meters of Nzovwe stream was divided into 5 sampling sites, each site was 100 meters apart. The macroinvertebrates were collected from all the possible microhabitats of each site using a 250µm mesh size D- frame kick net. Macroinvertebrate specimens were preserved in the 70% ethyl alcohol in the polyethylene bottles. The samples were identified to the family level using standard identification keys. The BMWP score and ASPT score indicated good and moderate stream water quality respectively. The FBI showed the stream had possibility of some organic pollution. The Shannon-Wiener diversity index shows the sampling sites were moderately polluted or possibly impaired. Macroinvertebrates in pollution class II were abundant, suggesting moderate pollution. Moreover, the % Midge, % Insects, % Diptera and % Snail indicated the stream water quality or ecosystem health is between unimpaired and possibly impaired. Based on these results, the study concludes that the stream ecosystem is moderately polluted, and therefore the study recommends a regular stream monitoring.



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