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Effects of macrophytes on aquatic macro-invertebrates in urban polluted lentic ecosystem: case of the man-made lakes of Yamoussoukro (Ivory Coast)

Tape Logboh David, Edia Oi Edia, Camara Idrissa Adama, Bony Kotchi Yves, Ouattara Allassane

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J. Bio. Env. Sci.12(5), 89-106, May 2018

DOI: http://dx.doi.org/10.12692/ijb/20.2.1-20

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Macrophtytes affect water resource utilisation, but little is known about its impacts on biodiversity in aquatic ecosystems particularly in Ivory Coast. This study allowed assessing the effects of macrophytes on aquatic macro-invertebrates in the urban lakes of Yamoussoukro. Macro-invertebrates were collected on twelve occasions at fourteen sites with macrophyte mats (Group 1) and at fourteen sites without macrophyte (Group 2) using a hand-net and a Van Veen grab. The diversity of the community was assessed in each group of sites. A total of 108 taxa distributed among five classes, twelve orders, 53 families and comprising 22074 individuals were recorded. The group 1 registered 84 taxa belonging to four classes, eleven orders and 46 families (50.50% of total abundance). The group 2 recorded 76 taxa comprising four classes, eleven orders and 27 families (49.50% of total abundance). Insecta were most diversified both in group 1 (84.2%) and group 2 (76.9%). Gasteropoda, especially Melanoides tuberculata and Physa marmorata were most abundant in each group (respectively 91% and 68.5%). Variations in Rarefied richness, abundance, Shannon-Weiner Diversity and Pielou’s Evenness Indexes between the two groups were not statistically significant (Mann-Withney test, p > 0.05). Scrapers were quantitatively (Group 1= 79%; Group 2= 61%) dominant in the two groups. Each group was mainly characterized by one family of Diptera (Tabanidae for group 1 and Culicidae for group 2) which are frequently vectors of various disease agents. Influence of macrophytes on macro-invertebrates in Yamoussoukro lakes was not perceptible because of their high level of pollution.


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Effects of macrophytes on aquatic macro-invertebrates in urban polluted lentic ecosystem: case of the man-made lakes of Yamoussoukro (Ivory Coast)

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