Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): J. Grogan; M. D. Loveless
    Date: 2013
    Source: American Journal of Botany
    Publication Series: Scientific Journal (JRNL)
    Station: International Institute of Tropical Forestry
    PDF: Download Publication  (1.2 MB)

    Description

    Premise of the study: Flowering phenology is a crucial determinant of reproductive success and offspring genetic diversity in plants. We measure the fl owering phenology of big-leaf mahogany ( Swietenia macrophylla , Meliaceae), a widely distributed neotropical tree, and explore how disturbance from logging impacts its reproductive biology. • Methods: We use a crown scoring system to estimate the timing and duration of population-level fl owering at three forest sites in the Brazilian Amazon over a fi ve-year period. We combine this information with data on population structure and spatial distribution to consider the implications of logging for population fl owering patterns and reproductive success. • Key results: Mahogany trees as small as 14 cm diam fl owered, but only trees > 30 cm diam fl owered annually or supra-annually. Mean observed fl owering periods by focal trees ranged from 18–34 d, and trees fl owered sequentially during 3–4 mo beginning in the dry season. Focal trees demonstrated signifi cant interannual correlation in fl owering order. Estimated population-level fl owering schedules resembled that of the focal trees, with temporal isolation between early and late fl owering trees. At the principal study site, conventional logging practices eliminated 87% of mahogany trees > 30 cm diam and an estimated 94% of annual pre-logging fl oral effort. • Conclusions: Consistent interannual patterns of sequential fl owering among trees create incompletely isolated subpopulations, constraining pollen fl ow. After harvests, surviving subcommercial trees will have fewer, more distant, and smaller potential partners, with probable consequences for post-logging regeneration. These results have important implications for the sustainability of harvesting systems for tropical timber species.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Grogan, J.; Loveless, M. D. 2013. Flowering phenology and its implications for management of big-leaf mahogany Swietenia macrophylla in Brazilian Amazonia. American Journal of Botany. 100(11): 2293-2305.

    Cited

    Google Scholar

    Keywords

    logging impacts, Meliaceae, population genetic structure, reproductive phenology, sustainable forest management, synchronous fl owering, tropical trees

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/49205