Community structure along elevation gradients in headwater regions of longleaf pine savannas

TitleCommunity structure along elevation gradients in headwater regions of longleaf pine savannas
Publication TypeJournal Article
Year of Publication2002
AuthorsDrewa P.B., Platt W.J., Moser E.B.
JournalPlant Ecology
Volume160
Pagination61-78
Date PublishedMay 1, 2002
ARIS Log Number131598
AbstractQuantitative descriptions of vegetation patterns and relationships with substrate characteristics at localized scales have received less attention than regional levels. Our primary objective was to examine the distributions of herbs and shrubs/trees along local topographic gradients in headwater regions of longleaf pine savannas in the southeastern United States. We also examined whether herb patterns were structurally similar to those of shrubs/trees along the same topographic gradients and whether patterns were correlated with edaphic factors. Abundance data were collected within quadrats placed along transects from upslope savannas through mid-slope seepage bogs into lower-slope shrub/tree zones within Louisiana and Florida. Beta-flexible cluster analysis and nonmetric multidimensional scaling were used to delineate herbaceous species communities. Ordination was performed separately on shrub/tree abundance data. The herb-based classifications were also used to delineate shrub/tree communities, providing an indirect means of comparing herb to shrub/tree distributions. In Louisiana, 3 herbaceous communities were sharply delineated along elevation gradients of several meters and were strongly correlated with soil moisture. In Florida, 3 similar herbaceous communities were less discrete along elevation gradients of
URLhttp://www.springerlink.com/media/e2wqmq6wtp5uug8nfv5q/contributions/x/d/l/p/xdlppcpceq4cyetp.pdf