The calanoid copepods of the Nile system

Abstract

At least I I or 12 calanoid taxa occur in the Nile system. One species is typical of the river and of Lake Chad (Th. galebi); two are restricted to Lake Victoria (Th. galeboides, T. stuhlmanni), but both might be only subspecies to more widespread species. One is restricted to Lakes Edward and George (T. worthingtoni) but is i little known species. No calanoids are on record from Lakes Albert and Kyoga, while the species reported from Lake Turkana (T. banforanus) is out of range, and almost certainly represents an erroneous record. Among the remaining species, four are East-African, ranging from the southern tip of the continent to the Ethiopian plateau and the Nile valley (P. schultzei, Th. mixtus, T. kraepelini, T. cf orientalis), while two are Sahelian species that span Africa from east to west (M. mauretanicus, T. processifer et ssp.).Two new synonyms are introduced. One new subspecies (T. processifierfriedae) is described from the Ethiopian plateau. It is suggested that Tropodiaptomus orientalis (Brady, 1886), the type species of its genus, should not be considered a nomen dubium, but should be redescribed on its type female(s) and on topotypical males from Sri Lanka. Hydrobiologia 110, 191-212 (1984).

The nature and origin of the crustacean zooplankton of Sahelian Africa, with a note on the Limnomedusa

“…It is a species that was originally described from temporary pans in the Kalahari semi-desert, later found back in rainpools on the Ussangi steppe, East Africa, and in numerous pools (at least part of which seem to be permanent) in the Kagera park, Rwanda (Dussart, 1977) . Recently, this animal was also discovered on the Ethiopian plateau and in Lake Chad area (Verheye & Dumont, 1984) (Fig . 12) .…”

“…The Senegal river is an improbable pathway, because of its mid-Holocene salinity. Gauthier (1951), Van de Velde (1978), Van de Velde & Dumont (1982) for the Senegal and Gambia basins ; Brehm (1933), Brehm & Kiefer (1958), Dumont & Van de Velde (1977), Green (1962), Humes (1960), Kiefer (1933), Dumont, Pensaert & Van de Velde (1981), Lindberg (1958), Dussart (1980) for the Niger basin; Gauthier (1939), Dussart & Gras (1966), Rey & St Jean (1968, 1969 for Lake Chad ; Rzoska (1976, which includes many older references), Kiefer (1978), Verheye & Dumont (1984), for the Nile system. Earlier attempts to synthesise this body of knowledge (Dumont 1979(Dumont , 1980, have shown that the plankton communities of the desert and semidesert belt are very different from those of the Sahel belt, and the latter again differ strongly from those of the equatorial rainforest belt .…”

Comprehensive Insight into Lake Nasser Environment: Water Quality and Biotic Communities—A Case Study before Operating the Renaissance Dam

“…After sampling, the samples were immediately preserved in the 4% neutral formalin solution until the microscopic examination. The species were identified according to Edmondson [23], Pennak [24] and Verheye and Dumont [25].…”