Dioecy hotspots in Southeast Florida (U.S.A.), especially Saw Palmetto (Serenoa repens, Arecaceae) thickets
DOI :
https://doi.org/10.17348/jbrit.v18.i1.1345Mots-clés :
Breeding systems, dioecy rates, hummocks, seedling recruitment, shade, Florida wetland ecologyRésumé
A survey of woody marshland hummocks, of Saw Palmetto (Serenoa repens, Arecaceae) thickets, and of additional Southeast Florida habitats revealed multiple sites with dioecy rates of 50–100%, especially in the Saw Palmetto thickets. These rates exceeded any encountered for woody species in a literature review globally or for Florida. A particularly notable feature of the thicket sites is extreme thick low-elevation palm frond canopy coverage, consistent with the historical perspective that a benefit of dioecy is sexual selection for seed quality where harsh ecological filters limit establishment.
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