Papers by Andrea Woolfolk
Continental Shelf Research, Jul 1, 2019
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Estuaries and Coasts, Mar 6, 2013
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Estuaries and Coasts, Aug 11, 2021
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Restoration Ecology, Aug 31, 2010
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AGU Spring Meeting Abstracts, May 1, 2007
Elkhorn Slough is the second largest area of estuarine tidal wetlands in California, and one of t... more Elkhorn Slough is the second largest area of estuarine tidal wetlands in California, and one of the first U.S. estuarine sanctuaries. Region-wide, 90% of historic tidal wetlands have been lost or restricted from tidal flow due to diking for agricultural use, salt pond construction, and development. However, wetland loss at Elkhorn Slough is currently being driven largely by tidal erosion,
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Wetlands, Feb 18, 2011
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Estuarine Coastal and Shelf Science, Jul 1, 2013
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Frontiers in Marine Science
Coastal eutrophication is a prevalent threat to the healthy functioning of ecosystems globally. W... more Coastal eutrophication is a prevalent threat to the healthy functioning of ecosystems globally. While degraded water quality can be detected by monitoring oxygen, nutrient concentrations, and algal abundance, establishing regulatory guidelines is complicated by a lack of baseline data (e.g., pre-Anthropocene). We use historical carbon and nitrogen isoscapes over ~300 years from sediment cores to reconstruct spatial and temporal changes in nutrient dynamics for a central California estuary, Elkhorn Slough, where development and agriculture dramatically enhanced nutrient inputs over the past century. We found strong contrasts between current sediment stable isotopes and those from the recent past, demonstrating shifts exceeding those in previously studied eutrophic estuaries and substantial increases in nutrient inputs. Comparisons of contemporary with historical isoscapes also revealed that nitrogen sources shifted from a historical marine-terrestrial gradient with higher δ15N near t...
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Estuaries and Coasts
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Location of study area in the Monterey bay area (inset map). Oak woodland sites (O1-O6) and eucal... more Location of study area in the Monterey bay area (inset map). Oak woodland sites (O1-O6) and eucalypt woodland sites (E1-E6).
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Areas analyzed for the eucalypt time series, 1931-2001. Name for sampled area given adjacent to r... more Areas analyzed for the eucalypt time series, 1931-2001. Name for sampled area given adjacent to region's polygon.
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Average abundances of species found in oak and eucalypt woodlands.
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Example of GIS analysis, documenting the spread of eucalypts between 1931 and 2001.
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Estuaries and Coasts, 2021
Sea level rise threatens coastal wetlands worldwide, and restoration projects are implementing st... more Sea level rise threatens coastal wetlands worldwide, and restoration projects are implementing strategies that decrease vulnerability to this threat. Vegetation monitoring at sites employing new restoration strategies and determination of appropriate monitoring techniques improve understanding of factors leading to restoration success. In Central California, soil addition raised a degraded marsh plain to a high elevation expected to be resilient to sea level rise over the next century. We monitored plant survival and recruitment using area searches, transect surveys, and unoccupied aircraft systems (UAS) imagery. We used random forest modeling to examine the influence of nine environmental variables on vegetation colonization and conducted targeted soil sampling to examine additional factors contributing to vegetation patterns. Limited pre-construction vegetation survived soil addition, likely due to the sediment thickness (mean = 69 cm) and placement method. After 1 year, about 10%...
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Biological Conservation, 2017
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Ecological Applications, 2015
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Elkhorn Slough is the second largest area of estuarine tidal wetlands in California, and one of t... more Elkhorn Slough is the second largest area of estuarine tidal wetlands in California, and one of the first U.S. estuarine sanctuaries. Region-wide, 90% of historic tidal wetlands have been lost or restricted from tidal flow due to diking for agricultural use, salt pond construction, and development. However, wetland loss at Elkhorn Slough is currently being driven largely by tidal erosion,
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Estuaries and Coasts, 2008
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PLOS ONE
Eutrophic conditions in estuaries are a globally important stressor to coastal ecosystems and hav... more Eutrophic conditions in estuaries are a globally important stressor to coastal ecosystems and have been suggested as a driver of coastal salt marsh loss. Potential mechanisms in marshes include disturbance caused by macroalgae accumulations, enhanced soil sulfide levels linked to high labile carbon inputs, accelerated decomposition, and declines in belowground biomass that contribute to edge instability, erosion, and slumping. However, results of fertilization studies have been mixed, and it is unclear the extent to which local environmental conditions, such as soil composition and nutrient profiles, help shape the response of salt marshes to nutrient exposure. In this study, we characterized belowground productivity and decomposition, organic matter mineralization rates, soil respiration, microbial biomass, soil humification, carbon and nitrogen inventories, nitrogen isotope ratios, and porewater profiles at high and low marsh elevations across eight marshes in four estuaries in Ca...
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Continental Shelf Research, 2019
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Papers by Andrea Woolfolk