Abstract
AbstractThe present study analyses the vegetation of canals and drains in the Nile Delta in relation to environmental factors. 30 clusters were generated by the TWINSPAN technique. A DC A (DECORANA) ordination revealed a moisture gradient, and, less clearly, a salinity and a fertility gradient. The resultant clusters were assigned to seven vegetation types arranged according to moisture preference as follows: Imperata cylindrica ‐ Desmostachya bipinnata, Phragmites australis, Panicum repens ‐ Cynodon dactylon, Echinochloa stagninum ‐ Polygonum salicifolium, Echinochloa stagninum, Eichhornia crassipes, and Ceratophyllum demersum‐Pótame geton crispas. Their species diversity is discussed in view of the disturbance and heterogeneity hypotheses.
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