Zonation of submerged macrophyte vegetation in Lake Kariba, Zimbabwe and its ecological interpretation

摘要: The submerged vegetation of Lake Kariba is described in relation to degree slope (lake morphometry), depth and light transparency. direct gradient analysis technique — canonical correspondence the TWINSPAN classification programs were used analyse data set. western end lake with low transparency has a species diversity (with Vallisneria aethiopica dominating). Species increases increased other parts lake. revealed monospecific communities for all as well mixed Lagarosiphon associate broadest distribution. ordination first axis strongly related gradients second slope. growth form adapted grow shallow areas subjected wave action. Potamogeton octandrus also growing restricted sheltered areas. ilicifolius precluded from exposed grows at medium but tap surface. Najas pectinata Ceratophyllum demersum are deep water.