maritime pine forest; ecotone; salt marsh; Slash pine; Pinus elliottii; yaupon; Ilex; groundsel tree; Bacharis; black-tipped needle rush; Juncus roemerianus; salt marsh cord grass; Spartina alterniflora; Sporobolus alterniflorus; bayou; Grand Bay; Grand Bay National Estaurine Research Reserve; Jackson County; Mississippi; MS