Resource Details

Effects of Dry Tropical Forest Fragmentation on the Reproductive Success and Genetic Structure of the tree Samanea saman

Literature: Journal Articles

Cascante, A., Quesada, M., Lobo, J. J. and Fuchs, E.A. 2002. "Effects of Dry Tropical Forest Fragmentation on the Reproductive Success and Genetic Structure of the tree Samanea saman." Conservation Biology, vol. 16, no. 1, pp. 137-147.

Contact Info

E-mail: mquesada@oikos.unam.mx

Affiliations

  • Escuela de Biología , Universidad de Costa Rica, San Jose, Costa Rica
  • Departamento de Ecología de los Recursos Naturales, Instituto de Ecología, Universidad Nacional Autónoma de Mexico, Apartado Postal 27-3 (Xangari), 58089, Morelia, Michoacán, Mexico

Link(s)

Conservation Biology

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Species Info

  • Samanea saman

Description

  • This study the effects of forest fragmentation on natural pollination, seed production, progeny vigor and genetic variation of S. saman, by comparing isolated trees in disturbed sites with those in continuous forest. Individual trees and seeds were sampled from continuous populations and isolated trees to examine numbers of pollen grains and pollen tubes for individual pollen styles, numbers of seeds that were aborted, damaged by beetle predation or undamaged, genetic parameters of progeny germinated in petri dishes, and finally the vigor of seedlings sowed, based on growth time, size, form and mass.
  • The results of the study showed a similar levels of pollination and seed production among isolated individuals and those in continuous forest, but higher levels of self-pollination (lack of genetic mixing) and decreased germination of seedlings of progeny from isolated trees. There were also higher levels of seed predation among fruits from continuous populations, compared to those from isolated trees.
  • This study shows that in the case of Samanea saman, despite increased inbreeding and a loss of genetic diversity among isolated trees, seed production levels remain the same, as do some (but not all) parameters of seedling vigor. This suggests that there is some reproductive and genetic connectivity maintained by pollinator species, and the authors suggest that isolated trees may serve as stepping stones between pollinators and tree populations.

Geographical Region

  • Southern Central America
  • Country

  • Costa Rica
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