The abundance and distribution composition of aquatic macrophyte species in a riparian stream in Odot, rainforest environment of south-south Nigeria were assessed twice a month at three stations between June and December 2014. The modified method of flora collection was used with a random sampling technique. The correlation analysis indicated that the distribution and abundance of aquatic macrophyte composition were significantly (P<0.05) different. Overall community structure was made up of 15 families, 18 genera and 19 species. The dominant family was Poaceae (84; 27.81%) with three species while the dominant specie was Acroceras zizanioides (66; 21.85%); weed floral contributions were 22 individuals (21.79%) in station 1, 15 individuals (16.67%) in station 2 and 29 individuals (26.14%) in station 3. The family Polygonaceae having only one specie Polygonum salicifolium was the least dominant (4; 1.33%). Shannon-Weiner diversity index showed that the highest diversity was recorded in June (2.64) and the least in August (2.29). Monthly macrophyte occurrence peaked in August (46; 15.23 %) and reduced to a minimum in September, November and December (41; 13.58 %). Spatial distribution revealed that of the 302 individual species encountered, station 3 had the highest number (111; 36.75%) while the lowest was observed in station 2 (90; 29.80%); station 1 had 101 individuals contributing 33.33%. The macrophyte community may be described as being polydiverse.
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