Distribution ofJuncus roemerianus in North Carolina tidal marshes: The importance of physical and biotic variables
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The physical habitat ofJuncus roemerianus was examined at nine sites along a salinity gradient in the Cape Fear River Estuary, North Carolina. Soil salinity, drainage, redox potential, pH, elevation, percent sand, percent organic matter, and above-ground plant biomass and height were measured at each site, and from these data, the habitat ofJuncus roemerianus was determined. All parameters varied over the salinity gradient, with soils at upriver sites having, a high sand fraction, low organic fraction, and highest redox potentials. Downriver, well-established marshes had low sand fractions, high organic fractions, and lowest redox potentials. Canonical Discriminant Analysis indicated that each site was statistically different from other sites due to salinity, elevation, and percent organic matter.
Mean standing live biomass was 688 g m−2 and, despite differences in physical and chemical factors among sites, biomass ofJuncus roemerianus did not vary.Juncus roemerianus was found to grow equally well within a broad range of physical and chemical habitats but did not occupy the total expanse of its potential habitat at any one site.
Extensive overlap in physical habitat occurred betweenJuncus-dominated communities and adjacent communities dominated by other species, especially in the more established marshes. However, Canonical Discriminant Analysis statistically separated short and tall formSpartina alterniflora, Distichlis spicata, Scirpus robustus, andJuncus roemerianus microhabitats based on elevation and redox potential. Thus, we found zonation in tidal marshes of the Cape Fear, River Estuary was based on abiotic factors, but we recognize the importance of plant species interactions and marsh position within the landscape.
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- Distribution ofJuncus roemerianus in North Carolina tidal marshes: The importance of physical and biotic variables
Volume 17, Issue 2 , pp 284-291
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- Print ISSN
- Online ISSN
- Springer Netherlands
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- tidal marsh
- physical gradient
- edaphic conditions
- Juncus roemerianus
- soil salinity
- Spartina alterniflora