ECOLOGICAL IMPACTS OF ECOHYDROLOGICAL INTERVENTION ON THE WETLANDS ALONG THE SOUTHEASTERN SHORE OF LAKE TANA, ETHIOPIA

Main Article Content

ESHETE ASNAKEW
ABERA SEYOUM

Abstract

Lake Tana watershed wetlands have critical functions of nutrient and sediment retention, biodiversity and hydrological functions. Although ecohydrological solutions have been proposed, a comprehensive study on the impacts of ecohydrology intervention in relation to biological aspects is limited. Information regarding the ecological impacts of ecohydrology based intervention approach in the wetland ecosystem plays an indispensable role in increasing biodiversity and improves water quality. Thus, the aim of this study was to investigate the impacts of ecohydrological intervention in relation to macrophytes, phytoplankton and zooplankton of the wetlands in Lake Tana shore. Quantitative characteristics of macrophytes and plankton sampling were conducted using transect and quadrat method along vegetation and water depth gradients. The biological data were measured on each fixed sampling point. Macrophytes, phytoplankton and zooplankton were significantly different (p<0.05) across the sampling sites. Low disturbed wetland supports higher abundance and diversity of macrophytes, phytoplankton and zooplankton than moderately and highly disturbed wetlands. Overall results of the study confirmed that biological abundance and diversity were associated with the level of disturbance of wetlands. Therefore, emphasis should be given to the factors which may lead to the degradation of wetland resources within and its catchment. Immediate ecohydrology based intervention approaches should be implemented to conserve and minimize further degradation of wetlands along the shore of Lake Tana.

Keywords:
Biodiversity, degradation of wetland, Ecohydrology, Lake Tana, Macrophytes, Plankton

Article Details

How to Cite
ASNAKEW, E., & SEYOUM, A. (2022). ECOLOGICAL IMPACTS OF ECOHYDROLOGICAL INTERVENTION ON THE WETLANDS ALONG THE SOUTHEASTERN SHORE OF LAKE TANA, ETHIOPIA. Journal of Global Ecology and Environment, 16(1), 1-13. Retrieved from https://ikppress.org/index.php/JOGEE/article/view/7618
Section
Original Research Article

References

Ramachandra TV. Restoration and management strategies of wetlands in developing countries. Electronic Green Journal. 2001;1:1076-7975.

Williamson CE, Dodds W, Kratz TK, Palmer MA. Lakes and streams as sentinels of environmental change in terrestrial and atmospheric processes. Frontiers in Ecology and the Environment. 2008;6:247-254.

Millennium Ecosystem Assessment Program. Ecosystems and human well-being: Synthesis. Island Press, Washington, DC, USA. 2005;5: 563.

Revenga C, Campbell I, Abell R, de Villiers P, Bryer M. Prospects for monitoring freshwater ecosystems towards the 2010 targets. Philosophical Transactions of the Royal Society B: Biological Sciences. 2005;360: 397-413.

Loh J, Wackernagel M. Living Planet Report. WWF, Gland; 2012.

Karunamoorthi K. Toxic effects of traditional Ethiopian fish poisoning plant Milletia ferruginea (Hochst) seed extract on aquatic macroinvertebrates. European Review for Medical and Pharmacological Sciences. 2009; 13:179–185.

Dechasa Jiru. Indiscriminate devegetation under improper farming system: A root cause for surface and underground water and food crisis in Ethiopia. Ecohydrology and Hydrobiology. 2010;10:201-209.

Ligdi EE, El Kahloun M, Meire P. Ecohydrological status of Lake Tana-A shallow highland lake in the Blue Nile (Abbay) basin in Ethiopia. Ecohydrology and Hydrobiology. 2010;10:109-122

Ayalew Wondie. Improving management of shoreline and riparian wetland ecosystems: The case of Lake Tana catchment. Ecohydrology and Hydrobiology. 2010;10:123-131.

Ethiopian Wildlife and Natural History Society (EWNHS). Important Bird Areas of Ethiopia. First inventory. Ethiopian Wildlife and Natural History Society. Addis Ababa, Ethiopia; 1996.

Zalewski M. Ecohydrology and hydrologic engineering: regulation of hydrology-biota interactions for sustainability. Journal of Hydrologic Engineering. 2015;20:14.

USEPA (U.S Environmental Protection Agency). Summary of biological assessment programs and bio-criteria development for states, tribes, territories, and interstate commissions: streams and wadeable rivers. USEPA, Office of Environmental Information and Office of Water. Washington, D.C; 2002.

IEP. Overview and comparison of macrophyte survey methods used in European countries and a proposal of harmonized common sampling protocol to be used for WISER Uncertainty Exercise including a relevant common species list. WISER, Warsaw. 2009;32.

Burlakoti C, Karmacharya SB. Quantitative analysis of macrophytes of Beeshazar Tal, Chitwan, Nepal. Himalayan Journal of Sciences. 2004;2:37-41.

Gaudet J, Muthuri FM. Nutrient relationships in shallow water in an African lake, Lake Naivasha. Oecologia. 1981;49:109–118.

Sutherland W. Ecological census techniques a handbook. Cambridge University Press, Cambridge. 1996;336.

Cain SA. The species-area curve. American Midland Naturalist. 1938;573-581.

Curtis JT. The vegetation of Wisconsin. University of Wisconsin Press, Madison; 1959.

Misra R. Ecology workbook. Oxford and IBH Publishing Co., New Delhi; 1968.

Environmental Protection Agency, U. S. National primary drinking water standards. Office of Water, US Environmental Protection Agency. Washington, DC, United States Environmental Protection Agency; 2003.

Singh K, Sharma B, Usha K. Inventory of the Aquatic Macrophytes in Lake Kharungpat, India. Journal of Energy Technologies and Policy. 2013;3:64–75.

Edmondson WT, Winberg GG (eds.). A manual on methods for the assessment of secondary production. IBP Handbook. 1971; 358.

Tesfaye Wudneh. Biology and management of fish stocks in Bahar Dar Gulf, Lake Tana, Ethiopia. Ph.D. thesis, Wageningen Agricultural University Wetzel, R and Likens, G. (2000). Limnological analysis, 3rd ed. New York: Springer-Verlag; 1998.

Wetzel R, Likens G. Limnological analysis, 3rd ed. New York: Springer-Verlag; 2000.

Shannon C, Weiner W. The Mathematical Theory of Communication. University of Illinois Press, Urbana, Illinois. 1963;117.

Kratzer EB, Batzer DP. Spatial and temporal variation in aquatic macroinvertebrates in the Okefenokee Swamp, Georgia, USA. Wetlands. 2007;27:127-140.

Lamprecht H. Silviculture in the Tropics. GTZ, Eschborn, Germany. 1989;296.

Simon M, Grossart HP, Schweitzer B, Ploug H. Microbial ecology of organic aggregates in aquatic ecosystems. Aquatic Microbial Ecology. 2002;28(2):175-211.

Magurran AE. Ecological diversity and its measurement. Princeton university press. Chapman and Hall, London; 1988.

Shimelis Aynalem, Afework Bekele. Species composition, relative abundance and distribution of bird fauna of riverine and wetland habitats of Infranz and Yiganda at southern tip of Lake Tana, Ethiopia. Tropical Ecology. 2008;49:199-209.

Meerhoff M, Fosalba C, Bruzzone C, Mazzeo N, Noordoven W, Jeppesen E. An experimental study of habitat choice by Daphnia: plants signal danger more than refuge in subtropical lakes. Freshwater Biology. 2006;51:1320- 1330.

Narasimha RK, Benarjee G. Physico-chemical factors influenced plankton biodiversity and fish abundance-a case study of Nagaram tank of Warangal, Andhra Pradesh. International Journal of Life Sciences Biotechnology and Pharma Research. 2013;2:248-260.

Emmanuel BE, Onyema IC. The Plankton and fishes of a tropical creek in South-western Nigeria. Turkish Journal of Fisheries and Aquatic Sciences. 2007;7:105-113.

Ayalew Wondie, Seyoum Mengistou, Vijverberg J, Eshete Dejen. Seasonal variation in primary production of a large high altitude tropical lake (Lake Tana, Ethiopia): Effects of nutrient availability and water transparency. Aquatic Ecology. 2007;41:195-207.

Kalff J. Limnology: Inland waters Ecosystems. Prentice-Hall. Inc. USA; 2002.

Chen HG, Peng F, Zhang ZY, Zhang L, Zhou XD, Liu HQ, Xu XF. Effects of engineered use of water hyacinths (Eicchornia crassipes) on the zooplankton community in Lake Taihu, China. Ecological Engineering. 2012;38:125-129.

Seyoum Mengistou, Fernando CH. Biomass and production of major dominant crustacean zooplankton in a tropical rift valley lake, Awasa, Ethiopia. J. Plankton Res. 1991;13: 831–852.

Eshete Dejen, Vijverberg J, Nagelkerke L, Sibbing F. Temporal and spatial distribution of micro crustacean zooplankton in relation to turbidity and other environmental factors in large tropical lake (Lake Tana, Ethiopia). Hydrobiologia. 2004;513:39-49.

Serruya C, Pollingher U. Lakes of the warm belt. London, Cambridge University Press. 1983;1-569.