, Volume 87, Issue 4, pp 506–513 | Cite as

Life-history variation in a hybrid species complex ofDaphnia

  • L. J. Weider
  • H. G. Wolf
Original Papers


Life-history variation was examined among members of theDaphnia longispina group, which consists ofD. galeata, D. hyalina, D. cucullata, and hybrids. Factorial experiments were conducted at two temperatures (14° and 20° C) and two food concentrations (0.2 and 1.0 mg Cl−1). Differences in life-history features (size at maturity, age at first reproduction, size of first clutch, offspring size in first clutch) under the different environmental conditions were assessed among eightDaphnia clones, which represented members of this species complex. Significant differences between parentals and hybrids for most life-history features were observed under various treatments; generally, hybrid clones showed intermediate life-history traits when compared with parentals. When comparisons were made among clones within a given species (i.e.D. galeata, D. galeata xcucullata, D. cucullata), clonal differences were also noted for certain life-history traits. The data are discussed with reference to the formation and maintenance of hybrid species complexes in nature.

Key words

Life histories Interspecific hybrids Daphnia Lakes Clones 


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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • L. J. Weider
    • 1
  • H. G. Wolf
    • 1
  1. 1.Abteilung ÖkophysiologieMax-Planck-Institut für LimnologiePlönFederal Republic of Germany

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