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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2558

Authors: Tujuba, Ayele
Advisors: Seyoum Mengistou (PhD)
Keywords: Profundal
Benthic macroinvertebrates
Copyright: Jul-2010
Date Added: 4-May-2012
Publisher: AAU
Abstract: The aim of the study was to investigate the abundance, diversity and community structure of macrobenthos in relation to some environmental variables. Benthic macroinvertebrates of Lake Kuriftu were sampled on a monthly basis from September 2009 to February 2010. Ekman grab (0.0225m2) samples were obtained from three stations. Organic matter content of the bottom sediment was determined by loss on ignition method. Benthic macroinbvertebrates were identified and their distribution was reported in relation to depth, bottom substrate, organic matter content, dissolved oxygen and macrophytes. Bottom samples of the lake contained larvae of insects, Oligochaetes, and Nematodes. In this study a total of 20443, 18251, and 4388 ind/m2of benthic macroinvertebrates were collected from littoral, profundal and benthic regions, respectively. Diptera larvae were the most abundant benthic macroinvertebrate in littoral, profundal and benthic regions with mean abundance of 12545, 14003 and 3215 ind/m2, respectively. Chironomidae larvae were highly abundant in profundal region. Ephemeroptera and Oligochaetaes were also numerous in littoral and profundal zones. Diptrea larvae and Oligochaetes were consistently found in the sediment at all depths. The abundance of benthic macroinvertebrates was correlated with temperature and depth. Bottom substrates from benthic and littoral were clay in texture and sandy clay in profundal region. The result shows that vegetated littoral regions of the lake bottom had similar and higher organic matter content than the bottom of the non-vegetated regions (profundal and benthic). The littoral region had highest diversity (H = 1.26) and richness (d=2.72) and benthic community density20443 ind/m2. In Lake Kuriftu Benthic fauna were concentrated in the littoral region in association with macrophytes. The profundal region is also colonized by numerous macroinvertebrates probably due to suitability of the bottom substrate. The overall variation in benthic mcroinvertebrates abundance and community structure in Lake Kuriftu were due to the slight variation of physic-chemical and sedement quality.
URI: http://hdl.handle.net/123456789/2558
Appears in:Thesis - Biology

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