Localized hybridization betweenSaxifraga aizoides andS. mutata (Saxifragaceae): Reproductive ecology ofS. ×hausmannii and implications for conservation View Full Text


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Article Info

DATE

1998-03

AUTHORS

Rolf Holderegger

ABSTRACT

The roles of hybridization and of introgression as potential threats to small native populations are current topics of interest both for evolutionary and conservation biologists. Two factors are mainly involved in the threat to natural populations through hybridization: demographic swamping and genetic assimilation. At prealpine locations, twoSaxifraga species with very different growth habits,S. aizoides andS. mutata, form a hybrid,S. ×hausmannii. Investigation of meiosis and crossing experiments revealed regular pairing of the 26 chromosomes and development of viable seeds in the hybrid. Analysis of hybrid indices, GPI allozymes, germination experiments and seed sizes showed an intermediate position ofS. ×hausmannii between its parental species.Saxifraga aizoides andS. mutata were separated by only weak hybridization barriers. Introgression occurred mostly in direction ofS. aizoides, although to a small amount. There is no actual threat to small, prealpine populations ofS. aizoides andS. mutata through interspecific gene flow because hybridization is localized, resulting from different flowering phenologies of the parental species and from the narrow habitat requirements ofS. ×hausmannii, which are similar to those ofS. aizoides. The major threat to local, prealpine populations ofS. aizoides andS. mutata is the loss of landscape dynamics. Both species need open erosion slopes for successful recruitment. More... »

PAGES

21-41

References to SciGraph publications

  • 1989. Enzyme Electrophoresis and Plant Systematics in ISOZYMES IN PLANT BIOLOGY
  • 1989. Visualization and Interpretation of Plant Isozymes in ISOZYMES IN PLANT BIOLOGY
  • 1989. Genetics of Plant Isozymes in ISOZYMES IN PLANT BIOLOGY
  • 1984-03. Distinguishing among white seeded bean cultivars by means of allozyme genotypes in EUPHYTICA
  • 1995. Plant Molecular Systematics in EVOLUTIONARY BIOLOGY
  • 1973-10. Introgression re-examined in THE BOTANICAL REVIEW
  • 1997-09. Hybridization ofSaxifraga oppositifolia andS. biflora (Saxifragaceae) in a mixed alpine population in PLANT SYSTEMATICS AND EVOLUTION
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/bf00988906

    DOI

    http://dx.doi.org/10.1007/bf00988906

    DIMENSIONS

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