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

Section: Discussionsupporting

confidence: 59%

“…A number of African Anomopoda have a similar distribution . Dumont & Verheye (1984) supposed that such areas were formed during the pluvial period 12,000-8,400 BP, when these water basins were connected .…”

Section: Discussionmentioning

confidence: 99%

A revision of the Simocephalus (latirostris) species group (Crustacea: Anomopoda: Daphniidae)

Orlova-Bieñkowskaja

1995

“…In Senegal its numbers were highest when its biotope was largely desiccated, and forms adapted to ephemeral life conditions were predominant (Moina, Streptocephalus, etc.). It is noteworthy that in the two known African stations the fauna of crustaceans was similar in many respects: D. senegal was accompanied by Streptocephalus (Anostraca), Latonopsis, Macrothrix, Moina and the Calanoid Copepod Paradiaptomus rex (identified by H. Dumont), a species typical of ephemeral water bodies of North-African lowlands (Dumont & Verheye, 1984). This strongly suggests a typological relation between both habitats.…”

Section: Some Remarks On Biologymentioning

confidence: 83%

The second record of Diaphanosoma senegal Gauthier, 1951 (Crustacea : Daphniiformes : Sididae) in Africa, with a redescription of the species and ecological and distributional setes

Korovchinsky

1991

The rare Diaphanosoma senegal has been found for the second time in Africa, in a water body North of Uagadugu (Burkina Faso). The species is here redescribed, with attention to individual and age variation. It combines primitive and evolutionarily advanced structural features, and inhabits temporary and intensely fluctuating water bodies of the equatorial and tropical zones. According to available data, its range is confined to West Africa and India.

“…Essentially all are relatively small-bodied, 'filter-feeding' micro-herbivores. Coexistence of any of the nine recognized species of Metadiaptomus with any of the seven known endemic species of Thermodiaptomus or any of the large number of Tropodiaptomus species is rare or absent (Dumont, 1980;Dumont & Verheye, 1984;Dussart & Defaye, 1983;Rayner, 1990;Rayner & Heeg, 1994), in keeping with the concept of limiting similarity (Begon et al, 1990), at least in terms of functional ecological equivalence.…”

Section: Introductionmentioning

confidence: 97%

Temperature-related distributions of Metadiaptomus and Tropodiaptomus (Copepoda: Calanoida), particularly in southern Africa

Hart

Rayner

1994

Updated locality records of species of Metadiaptomus and Tropodiaptomus on the African continent confirm the generally disjunct distribution of these two taxa as recognised by Dumont (1980) in North Africa. Distributional data for southern Africa reveal little range overlap between these two genera. Apart from two south western Cape taxa, species of Metadiaptomus are largely confined to upland, higher latitude, semi-arid or arid warm subtemperate regions, while species of Tropodiaptomus generally occupy moist, lower-lying, lower latitude subtropical regions. Separation along latitudinal and/or altitudinal axes implicates temperature as a controlling factor, while separation on the precipitation axis suggests the importance of habitat permanence. Using a multiple regression equation derived for African waters to predict water temperature from latitude and altitude, it is shown that the two genera tend to separate around the 20 C mean annual temperature isotherm. Additional factors influencing distribution (habitat permanence, water quality, competition and predation) are discussed.