Le plancton des mares natronées du Tchad

Pourriot, R.; Iltis, André; Levêque-Duwat, S.

doi:10.1002/iroh.19670520404

Cited by 19 publications

(7 citation statements)

References 9 publications

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“…Iltis & RiouDuwat (1971) recorded even higher maximum numbers from one of their lakes in Chad, reaching a biomass of about 1 X 10 11 µm 3 / I (calculated on the basis of our specimens) . Cephalodella elmenteita (de Beauchamp, 1932), originally described from this lake, was not seen in our samples, but has been reported from Chad (Pourriot et al . 1967 ;Iltis & Riou-Duwat (1971) .…”

Section: Rotifer Successions Of Class III Lakesmentioning

confidence: 60%

“…The content of dissolved ions in these three soda lakes (fof%details see Talling &Talling 1965 andMilbrink 1977) differs profoundly from other soda lakes on the African continent, such as those studied by Pourriot et al (1967) in Chad. The former are high in Na+ and Cl-, while the latter have a much higher K+ and SO:-content.…”

Section: Limnological Characteristics Of the Lakesmentioning

confidence: 99%

“…The keel extends to about three-quarters of the body length and is characteristically sharply bent at the . ilaI66 --.6_ C This very rare species was described originally from Indonesia and found again by Pourriot (1968) in Lake Chad . I found one specimen in Lake Naivasha on 11/6/80 .…”

Section: Rotifer Successions Of Class III Lakesmentioning

confidence: 99%

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Succession of planktonic rotifer populations in some lakes of the Eastern Rift Valley, Kenya

Nogrady

1983

Hydrobiologia

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The quantitative succession of the spring and summer rotifer plankton and its biomass in six lakes of the Eastern Rift Valley of Kenya is discussed . The lakes can be divided into two groups : the low conductivity slightly alkaline lakes Naivasha, Oloidien and the Winam Gulf of Lake Victoria ; and the high conductivity, highly alkaline-saline lakes Nakuru, Elmenteita and Bogoria . The former three show a qualitatively rich, typical warmwater rotifer association dominated by Brachionids and Filinia . The saline soda lakes are dominated by several populations of Brachionus dimidiatus, which can reach enormous numbers . The taxonomy and biometry of this species was subjected to statistical analysis . Some interesting and rare species are described : Anuraeopsis coelata, Lepadella triptera f. deconincki, Trichocerca gracilis and T. mus.

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Section: Rotifer Successions Of Class III Lakesmentioning

confidence: 60%

Section: Limnological Characteristics Of the Lakesmentioning

confidence: 99%

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Succession of planktonic rotifer populations in some lakes of the Eastern Rift Valley, Kenya

Nogrady

1983

Hydrobiologia

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“…Some species are espe-2 6 9 cially often dominant (or solely existing) in such environments, viz. Brachionus plicatilis Mull ., B. dimidiatus (Bryce) and some Hexarthra forms (see also, e .g ., Pourriot et al, 1967 ;Ruttner-Kolisko, 1971 ;Green et al, 1979 ;Green, 1981 and1986 ;Nogrady, 1983 ;Brock & Shiel, 1983 ;Shiel & Koste, 1986 ;Herzig & Koste, 1989 ;Virro, 1993) . Also some forms of Proales seem to be specialized for saline waters (Brain & Koste, 1993) .…”

Section: Saline Watersmentioning

confidence: 99%

Relation to habitat in rotifers

Pejler¹

1995

Hydrobiologia

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Rotifera should be especially suited for an analysis of habitat relations because this group contains such a high number of species, inhabiting diverse environments . Furthermore, rotifers are to a large extent cosmopolitan, implying that ecological barriers, rather than geographical, are decisive of their distribution . In this review a short characterization of the rotifer fauna in different habitats is given, whereby macroenvironments and microenvironments are reported separately . The macroenvironments are classified as follows : `harmonious' lakes and ponds, arctic and antarctic waters, hot springs, hypertrophic-saprobic environments, mires, strongly acidic waters, saline waters, temporary water bodies, subterranean waters, running waters, oceans, terrestrial environments . The following microenvironments are distinguished : macrophytes (housing periphytic rotifers), open water (with planktic forms), minerogenous sediments (with psammon and hyporheos), organogenous sediments, other organisms (i .e . parasites and epizoans) .Many rotifers are more or less euryecious, while relatively few are strongly restricted in their choice of habitat . In extreme environments a low number of species is found, but often a high number of individuals within these species . These rotifers are usually primary consumers, and for natural reasons extreme environments are characterized by a low number of trophic levels .In environments with a high species number the separate species differ very much in their morphology, making it difficult to find common traits which may be interpreted as adaptations to the respective habitats . The most apparent adaptations ought to be found among the planktic rotifers, and these adaptations seem to constitute largely a protection against predators . Rotifers in extreme environments are usually not very apart in a morphological or taxonomical respect, with their most close relatives living in `normal' habitats and sometimes euryecious (an apparent exception from this rule is formed by the class Seisonidea) . Adaptations to deviating chemical and physical environments may develop relatively rapidly (seen from a geological perspective), while the more fundamental changes (occurring during a longer period of time) seem to be a response to biotic factors (e .g ., the development of different types of trophi for facilitating food collection) .

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“…nov. belongs to the group of Brachionus-species (Segers et al 1993) displaying the apomorphic sickle-shape of the manubria and satellites on the rami. Superficially it resembles the rare but wi despread B. dimidiatus f. inermis which mainly inha bits soda waters (Pourriot et al 1967, Koste 1978, Koste & Shiel 1987. Nevertheless, both taxa are rea dily distinguished by their external morphology and structure of the trophi.…”

Section: Etymologymentioning

confidence: 95%