, Volume 82, Issue 4, pp 501–506 | Cite as

Mating systems of two Bombacaceous trees of a neotropical moist forest

  • D. A. Murawski
  • J. L. Hamrick
  • S. P. Hubbell
  • R. B. Foster
Original Papers


A multilocus mixed mating model was used to analyze the mating systems of two tropical canopy trees in the Bombacaceae that differ in successional status and overall abundance. One population of each species was studied on Barro Colorado Island, Republic of Panama. Population outcrossing estimates of 0.57 and 0.35 from two years indicate a mixed-mating system with intermediate outcrossing levels for the gap-specialist Cavanillesia platanifolia, a relatively rare component of the island flora. Population and individual outcrossing estimates were associated with flowering tree density or degree of spatial isolation. Trees within clusters of flowering individuals have a higher degree of outcrossing than isolated trees. Annual estimates of individual tree outcrossing rates varied greatly as a function of flowering in its nearest neighbors. In contrast to C. platanifolia, Quararibea asterolepis was completely outcrossed and may be self incompatible. Maternal trees of both species had significantly heterogeneous pollen pools indicating non-random outcrossing. Apomixis by sporophytic agamospermy was rejected in C. platanifolia as contributing to the apparent selfing rate.

Key words

Bombacaceae Mating system Panama Rain forest Tropics 


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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • D. A. Murawski
    • 1
    • 2
  • J. L. Hamrick
    • 1
    • 2
  • S. P. Hubbell
    • 3
    • 4
  • R. B. Foster
    • 4
  1. 1.Department of BotanyUniversity of GeorgiaAthensUSA
  2. 2.Department of GeneticsUniversity of GeorgiaAthensUSA
  3. 3.Department of BiologyPrinceton UniversityPrincetonUSA
  4. 4.Smithsonian Tropical Research InstituteBalboaPanama

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