The ecology and management of African wetland vegetation: A by Patrick Denny (auth.), Patrick Denny (eds.)

By Patrick Denny (auth.), Patrick Denny (eds.)

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Cape Province Swart est. = Swartvlci estuary, Cape Province I = Umshlatuzi . \1aputaland 13 = Lower Kosi system. S em· I ), and commonly forms very dense beds of vegetation in brackish coastal lagoons with conductivities of 10 000 ~IS cml, or more. It can even tolerate occasional temporary inundation by seawater (Howard-Williams. 1980a). There are indications that it is a poor competitor in unpolluted freshwaters, and in those environments favourable to the establishment of competitor species it declines.

But overall salinity and its effect on salt uptake mechanisms may be catastrophic. Marine species. 2) on the other hand. are intrinsically different. being adapted to this particular environment. This leaves pH and alkalinity to be considered. Chemically. they are interdependent. and so it is not easy to distinguish independent biological responses. 4 it was suggested that submerged plants could be divided into bicarbonate and non-bicarbonate users. The former frequently have a wide range of tolerance to carbon dioxide supply.

Tht' distribution of Potamogeton thullhergii Cham. & Schlcchtend. in Africa. (From SYllloens. ) the Middle East, and extend into North Africa and Egypt, Potamogeton nodosus is sometimes mistaken for p, thunbergii. but Symocns, Van de Velden and Buscher (1979) have now identified clear anatomical characters which separate these two species. , 1979), and see Fig, 2,2, Wickens (1970) found it in Jebel Marra, and it mysteriously appeared in Angola, the only African record south of the Equator. although it does occur in Madagascar.

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