Document Detail

Multiple causes of seedling rarity in scrub plum, Prunus geniculata (Rosaceae), an endangered shrub of the Florida scrub.
MedLine Citation:
PMID:  21622375     Owner:  NLM     Status:  In-Data-Review    
Conservation of an imperiled plant often requires an understanding of its reproductive ecology. Scrub plum (Prunus geniculata) is an endangered Florida shrub endemic to pyrogenic xeric uplands. Although plants are long-lived and may flower profusely, particularly after burning, fruit yield is sparse and seedlings are rare. We investigated potential causes of seedling rarity in scrub plum by studying its floral sex and breeding systems, fruit development, and germination ecology. We also developed a flow chart based on two time-since-fire scenarios to illustrate the cumulative impact of these factors on seedling recruitment. Breeding system experiments suggested partial gametophytic self-incompatibility in this functionally andromonoecious species, with inbreeding depression in self-compatible individuals. Predispersal seed predation, the major constraint on seedling recruitment, was lower in the first postburn season. In two field experiments, seed germination was <11% irrespective of treatment. These results indicate that seedling recruitment in scrub plum may be limited by multiple factors, including sexual reproductive failure, high predispersal seed predation, and low seed germination. The chance of a bisexual flower producing a seedling ranges from 5 in 1000 to 5 in 100000, depending on the time since fire. Restoration of scrub plum's historical fire regime may mitigate some of these factors.
Carl W Weekley; David N Zaya; Eric S Menges; Amy E Faivre
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Publication Detail:
Type:  Journal Article     Date:  2009-12-18
Journal Detail:
Title:  American journal of botany     Volume:  97     ISSN:  0002-9122     ISO Abbreviation:  Am. J. Bot.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2011-05-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370467     Medline TA:  Am J Bot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  144-55     Citation Subset:  -    
Archbold Biological Station, P.O. Box 2057, Lake Placid, Florida 33862 USA.
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