Inter- and intraspecific differences in Daphnia life histories in response to two food sources: the green alga Scenedesmus and the filamentous cyanobacterium Oscillatoria

The effects of two food sources on life history traits of Daphnia galeata, Daphnia cucullata and their interspecific hybrid. D.cucullataxgaleata, were studied. For each taxon, two clones were reared on both a green alga (Scenedesmus obliquus) and a filamentous cyanobacterium (Oscillatoria limnetica)...

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Bibliographic Details
Published in:Journal of plankton research 1996-07, Vol.18 (7), p.1213-1223
Main Author: REPKA, S
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Protozoa. Invertebrata
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Summary:The effects of two food sources on life history traits of Daphnia galeata, Daphnia cucullata and their interspecific hybrid. D.cucullataxgaleata, were studied. For each taxon, two clones were reared on both a green alga (Scenedesmus obliquus) and a filamentous cyanobacterium (Oscillatoria limnetica). Reproduction on Oscillatoria was generally lower than on Scenedesmus, but a positive population growth rate was still achieved, except in one hybrid clone Life history traits showed differences among the intraspecific clones. Daphnia cucullata, the smallest of the three taxa, was the best of the three in utilizing Oscillatoria as food, but D.galeata and the hybrid did not differ clearly. The clones within the taxa also differed in the extent they could utilize Oscillatoria as food. The results are discussed in relation to the co-existence of these taxa in nature.
ISSN:0142-7873
1464-3774
DOI:10.1093/plankt/18.7.1213