Open Access. Powered by Scholars. Published by Universities.®
- Publication Type
Articles 1 - 4 of 4
Full-Text Articles in Entire DC Network
An Evaluation Of Unmanned Aircraft System (Uas) As A Practical Tool For Salt Marsh Restoration Monitoring, San Francisco Bay, Ca, Kevin Eng
Master's Projects and Capstones
Salt marshes in the San Francisco Bay area provide essential ecosystem services from critical habitat to buffering coastal flooding and are the focus of substantial ecological restoration, necessitating improved restoration monitoring approaches. Metrics such as land cover classification, bare ground elevation, and vegetation height provide an understanding of the functionality and health of tidal wetlands. Unlike traditional monitoring methods, which rely on time and labor-intensive field surveys or macroscale remote sensing techniques, unmanned aircraft systems (UAS) provide site specific high spatial resolution data that is comparable to satellite and manned aircraft derived imagery. I compared published literature and provided primary …
Diversity-Function Relationships Changed In A Long-Term Restoration Experiment, James M. Doherty, John Callaway, Joy B. Zedler
Diversity-Function Relationships Changed In A Long-Term Restoration Experiment, James M. Doherty, John Callaway, Joy B. Zedler
Environmental Science
The central tenet of biodiversity-ecosystem function (BEF) theory, that species richness increases function, could motivate restoration practitioners to incorporate a greater number of species into their projects. But it is not yet clear how well BEF theory predicts outcomes of restoration, because it has been developed through tests involving short-run and tightly controlled (e.g., weeded) experiments. Thus, we resampled our 1997 BEF experiment in a restored salt marsh to test for long-term effects of species richness (plantings with 1, 3, and 6 species per 2 x 2 m plot), with multiple ecosystem functions as response variables. Over 11 years, 1- …
Plant Assemblage Composition Explains And Predicts How Biodiversity Affects Salt Marsh Functioning, Gary Sullivan, John Callaway, Joy B. Zedler
Plant Assemblage Composition Explains And Predicts How Biodiversity Affects Salt Marsh Functioning, Gary Sullivan, John Callaway, Joy B. Zedler
Environmental Science
Knowing that diverse plantings enhanced biomass and nitrogen (N) accumulation in a restored California salt marsh, we asked if the “biodiversity effect” was due to species selection or complementarity. In a two-year greenhouse experiment, we found positive biodiversity effects on total, root, and shoot biomass, total and root N crop, and on biomass and N allocation; negative effects on root and shoot N concentration; and no effect on shoot N crop. Overyielding among trios and sextets was supported by significant deviations in observed yield from that expected relative to solo yields (DT). However, both trios and sextets …
Species-Rich Plantings Increase Biomass And Nitrogen Accumulation In A Wetland Restoration Experiment, John Callaway, Gary Sullivan, Joy B. Zedler
Species-Rich Plantings Increase Biomass And Nitrogen Accumulation In A Wetland Restoration Experiment, John Callaway, Gary Sullivan, Joy B. Zedler
Environmental Science
Our test of the hypothesis that biomass and nitrogen would increase with more species-rich plantings simultaneously vegetated a salt marsh restoration site and demonstrated that on average, randomly chosen, 6-species plantings accumulated more biomass and nitrogen than the mean for 0- and 1-species assemblages, with the mean for 3-species assemblages being intermediate. In addition, we found that individual species (from the pool of eight native halophytes) differed in their functional capacity, with Salicornia virginica (Sv) and Jaumea carnosa contributing the greatest biomass when planted alone, while Triglochin concinna had the highest tissue N concentrations. When planted alone, Sv accumulated comparable …