According to figure (5) the largest number of species was in the last group
(last three Sites) of Sites especially at Site 22 that may be because these Sites have a
shallow water, slow water flow, high availability of nutrients, and sediment quality
with high organic matter percentage, that may be comes from human activity, while
the decrease of diversity (Shannon and N2) in other upstream Sites that may be
because exposed the aquatic plant to harvesting (grazing by water buffalo, caws, and
fish), the deep of Sites increasing with upstream ward, the nutrient is decrease with
upstream ward, and different in sediment quality (Al-Haidarey 2012) so the blooming
and biodiversity of aquatic vascular plant is increasing with the downstream, that was
agree with Serag and Khedr (2001) in El-Salam Canal in Egypt.