Distribution and abundance of submerged aquatic vegetation in east Hammar marsh in relationship to environmental factors changing

الملخص EN

The distribution of submerged aquatic vegetation (SAV) was studied in three stations of the East Hammar marsh during October 2015 to September 2016.

Five species belong to three families were existed in the whole study period.

Monthly sampling was conducted for vegetation cover, biomass, physical and chemical characteristics of water and soil in each station.

CANOCO ordination program (CCA) was used to analyze the data statically.

There is a negative relationship between Ceratophyllum demersum, Myriophyllun Spicatum, and the depth, salinity.It also shows the negative relationship between Potamogeton and turbidity.

Decreasing in the abundance of SAV was largely occurred in contrast with historical data.

Species richness and abundance at all stations were analyzed for the same period using biodiversity indices.

There were differences in species richness among stations.

It can be concluded that decreasing of abundance and distribution of SAV due to increasing of salinity and nutrient in addition to human impact.