You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Biomass Removal and Elevation on Species Richness in a New England Salt Marsh
J. Stephen Brewer, Jonathan M. Levine and Mark D. Bertness
Vol. 80, No. 2 (Nov., 1997), pp. 333-341
Stable URL: http://www.jstor.org/stable/3546601
Page Count: 9
You can always find the topics here!Topics: Species, Biomass, Growing seasons, Salt marshes, Seedlings, Marshes, Plants, Salinity, Vegetation, Wetland ecology
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
An experimental study of the effects of biomass removal and elevation on species richness was conducted in a New England salt marsh. We compared recovery of salt marsh vegetation at low, medium, and high elevations within the marsh (corresponding to high, medium, and low tidal flood stress, respectively). During the second growing season of the study, biomass removal affected species richness in a complex manner. By the end of the second growing season of the study, biomass-removal plots had greater species richness than controls at high elevations (4.6 vs 2.4), while at low elevations, biomass-removal plots had lower species richness than controls (0.9 vs 1.8). At middle elevations, species richness in removal plots was not significantly different from that in controls. By the end of the third growing season of the study, species richness in removal plots was nearly equal to that of control plots at all elevations. The decline in species richness between the second and third growing seasons of the study in removal plots at high elevations was due to the fact that clonal perennials persisted and assumed dominance in removal plots, while annual species were extirpated. Our results suggest that abiotic stress (i.e., high salinity, low redox) limited local species richness at low elevations in the marsh and that positive interactions (i.e. the presence of vegetation) ameliorated this abiotic stress. Competitive interference of seedling establishment limited local species richness at high elevations.
Oikos © 1997 Nordic Society Oikos