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Distribution and community structure of fish in relation with water physico-chemical parameters of floodplain rivers in the Alitash National Park, Ethiopia

Published online by Cambridge University Press:  25 March 2022

Alamrew Eyayu  and
Abebe Getahun
Alamrew Eyayu*
Affiliation:
Department of Biology, Debre Berhan University, P.O.Box 445, Debre Birhan, Ethiopia
Abebe Getahun
Affiliation:
Department of Zoological Sciences, Addis Ababa University, Addis Ababa, Ethiopia
*
Author for correspondence: Alamrew Eyayu, Email: [email protected]
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Abstract

Riverine ecosystems are highly exposed to different forms of human activities and fish distribution in such habitats can be affected by different features of water. Tributaries of the Abbay and Tekeze Basins are supporting all life requesting activities in Ethiopia. Fisheries of these habitats are also the mainstay of livelihoods. However, brutal human activities are affecting these ecosystems and the fish therein. This study was thus undertaken to examine fish distribution and community structure in relation to water parameters in Ayima, Gelegu and Shinfa Rivers. 2719 fish specimens identified into 43 species were sampled using gillnets, cast nets and electro-fishing on a seasonal campaign. Based on frequency of occurrence (%FO), 5 species fell in the category of ‘euconstant occurrence’ or their FO was ≥75%, while many species were laid in the ‘constant occurrence’. Among others, site depth, total phosphorus, dissolved oxygen and river channel diameter were key environmental factors determining fish community structure. Similarity percentage produced an overall average Bray-Curtis dissimilarity of 60.8% between the fish communities of the three rivers. The final model accounted for 77.2% of the total variance in fish composition, and all canonical axes were significant (Monte Carlo test 499, p = 0.002). Generally, this study was conducted in areas where no ecological studies are undertaken and the results obtained from this study could be important for sustainable utilization of Ethiopian fisheries.

Keywords

Alitash National Parkfloodplain riversredundancy analysis
Type
Research Article
Information
Journal of Tropical Ecology , Volume 38 , Issue 4 , July 2022 , pp. 171 - 182
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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