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Macroinvertebrate Fauna of a Tropical Freshwater Stream in Nigeria

By Animal Research International, University Of Nigeria, Nsukka.

Summary

Aquatic macroinvertebrates are an assemblage of aquatic community represented by members of almost all the invertebrate taxa. Most macroinvertebrate are benthic (benthos), others are planktonic or nektonic or surface water dwellers.
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Abstract

ABSTRACT
Macroinvertebrate fauna of Ogbei stream in Anambra state, Nigeria was studied from monthly samples taken from six stations or sites with a benthic scoop net and a serrated cylindrical sampler(SCS) for 12 months (May, 2002 – Apri 2003). A toal of 11420 macroinvertebrates were colected belonging to 4 classes, 13 orders, 28 families and50 species. The fauna was dominated numerically by Insecta (98.29 %), Arachnida (0.81%) and Oligochaeta (0.66%). Diptera was the most abundant taxon (42.62%), foowed by Odonata (36.89%), Coleopera (9.76 %) and Hemiptera (8.22 %). Station 3 had the highest percentage of abundance of the macrofauna (28.56 %) followed by station 2 (19.54 %). The highest faunal diversiy was recorded in station 6 The macroinvertebrate composition, distribution abundance and diversity were influenced by substrate composition, good water quality and availability of food.

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