Peter J. Sharpe

Peter J. Sharpe
National Park Service | NPS · Division of Resource Management

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17
Publications
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280
Citations

Publications

Publications (17)
Article
Delta wetlands are increasingly recognized as important sinks for ‘blue carbon,’ although this and other ecosystem services that deltas provide are threatened by human activities. We investigated factors that affect sediment accretion using short term (3 years using marker horizons) and longer-term measures (∼50 year using ¹³⁷ Cs soil core distribu...
Article
We performed an assessment of U.S. Geological Survey/National Park Service (USGS/NPS) vegetation mapping versus National Wetland Inventory (NWI) estimates of wetland occurrence and extent for three national parks, each having a different NWI mapping scale (1:40,000, 1:58,000, and 1:80,000). Our prediction was that the USGS/NPS mapping would be sign...
Article
Marsh restoration is an effective tool to remove water and soil metals via plant uptake and soil accumulation. However, few studies have attempted to quantify metal accumulation and removal in Mediterranean restored marshes. This study aimed to assess changes in water and soil metals in an oligohaline-restored marsh experiment that was set in an ab...
Article
Eutrophication is now a serious environmental problem worldwide because it disrupts the metabolism of aquatic ecosystems. In the Ebro Delta, intensive rice farming during the 20th century has increased coastal eutrophication and caused ecological and economic impacts. Marsh restoration is as an effective economic and ecological tool to remove nutri...
Conference Paper
The Ebro Delta (Spain) is among the most important marsh areas in the Western Mediterranean Sea. Fluvial sediment reduction by dams in a relative sea-level rise (RSLR) scenario has increased the delta plain flooding risk. The objective of this study was to assess factors controlling of marsh elevation and C accumulation in a Mediterranean oligohali...
Conference Paper
Full-text available
The Ebro Delta (Spain) is among the most important marsh areas in the Western Mediterranean Sea. Fluvial sediment reduction by dams in a relative sea-level rise (RSLR) scenario has increased the delta plain flooding risk. The objective of this study was to assess factors controlling of marsh elevation and C accumulation in a Mediterranean oligohali...
Conference Paper
Full-text available
The Ebro Delta (Catalonia, Spain) is one of the most valuable coastal zones within the Mediterranean Sea, supporting a highly productive rice agricultural system, as well as a myriad of coastal marsh habitats. However, chronic reductions of fluvial sediments coupled with accelerated relative sea level rise (RSLR) have created an environment where a...
Article
Recent evidence from field surveys suggests that periodic saline intrusions into tidal freshwater wetlands may not reduce plant species richness and that reductions in richness may not occur until a more consistent brackish salinity regime develops. In a greenhouse experiment using tidal wetland mesocosms, we tested the hypothesis that plant specie...
Conference Paper
Full-text available
The Delta of the Ebro River (Catalonia, Spain) is among the most important wetlands in the western Mediterranean, highly valuable both economically and ecologically. Its natural hydrological and sedimentary regimes have been heavily modified by dams and land reclamation leading to coastal erosion and surface elevation loss. The historic and current...
Article
The Ebro Delta in Catalonia, Spain is an ecologically and commercially important wetland system under threat from sea level rise and marsh subsidence. Our principal hypothesis was that a brackish marsh that receives inorganic sediments and fresh water amendments from the Ebro River would exhibit significantly higher rates of soil accretion, resulti...
Article
Full-text available
It is widely accepted that in coastal wetlands a negative relationship exists between plant species richness (number of species) and salinity. However, the distribution of species richness across estuarine salinity gradients has not been closely examined. We hypothesized that plant species richness in coastal marshes (i.e., wetlands dominated by he...

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