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Sympatry of Streptocephalus torvicornis (Waga, 1842) and S. Rubricaudatus (Klunziger, 1867) (Anostraca, Crustacea): hybridization and niche selection
Adriaens, E. (1993). Sympatry of Streptocephalus torvicornis (Waga, 1842) and S. Rubricaudatus (Klunziger, 1867) (Anostraca, Crustacea): hybridization and niche selection, in: Chardon, M. et al. Third Belgian Congress of Zoology, 5-6 November 1993. Belgian Journal of Zoology, 123(Suppl. 1): pp. 3
In: Chardon, M.; Goffinet, G. (Ed.) (1993). Third Belgian Congress of Zoology, 5-6 November 1993. Belgian Journal of Zoology, 123(Suppl. 1). University of Liège: Liège. 109 pp., more
In: Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent. ISSN 0777-6276; e-ISSN 2295-0451, more
Peer reviewed article  
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Document type: Summary
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    Fresh water
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  • Adriaens, E.
Abstract
    S. torvicornis and S. rubricaudatus can occur sympatrically, i.e. they live at the same time in the same temporary pools. Laboratory hybrids were obtained from no-choice mating tests between S. torvicornis and S. rubricaudatus. The mixing of species-specific characteristics found in the hybrids is discussed, based on the structure of the setae of the limbs and the antennae of the males. The Fl generation was non fertile. The hatching percentage of the hybrid cysts was much lower than that of the parental populations. Only about half of the hybrids reached maturity. Some of those that did reach the adult stage, died prematurely because of deformation of the filtration apparatus. Feeding S. torvicornis and S . rubricaudatus with nematodes, cladocerans and rotifers showed that they consume food particles of different size. The same was seen when comparing both sexes of the same species. In general the diet of S. rubricaudatus is composed of smaller particles. The considered populations of S. torvicornis and S. rubricaudatus are reproductive isolated and they have a different feeding ecology.
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