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Добірка наукової літератури з теми "Salt marsh"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 31 серпня 2024

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Статті в журналах з теми "Salt marsh"

Haacks, Manfred, and Dietbert Thannheiser. "The salt-marsh vegetation of New Zealand." Phytocoenologia 33, no. 2-3 (June 1, 2003): 267–88. http://dx.doi.org/10.1127/0340-269x/2003/0033-0267.

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Silvestri, Sonia, Marco Marani, Jeff Settle, Fabio Benvenuto, and Alessandro Marani. "Salt marsh vegetation radiometry." Remote Sensing of Environment 80, no. 3 (June 2002): 473–82. http://dx.doi.org/10.1016/s0034-4257(01)00325-x.

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Broome, Stephen W., Ernest D. Seneca, and William W. Woodhouse. "Tidal salt marsh restoration." Aquatic Botany 32, no. 1-2 (October 1988): 1–22. http://dx.doi.org/10.1016/0304-3770(88)90085-x.

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Meyer, David L., and Martin H. Posey. "Influence of Salt Marsh Size and Landscape Setting on Salt Marsh Nekton Populations." Estuaries and Coasts 37, no. 3 (September 25, 2013): 548–60. http://dx.doi.org/10.1007/s12237-013-9707-z.

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Guimond, Julia, and Joseph Tamborski. "Salt Marsh Hydrogeology: A Review." Water 13, no. 4 (February 20, 2021): 543. http://dx.doi.org/10.3390/w13040543.

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Groundwater–surface water exchange in salt marsh ecosystems mediates nearshore salt, nutrient, and carbon budgets with implications for biological productivity and global climate. Despite their importance, a synthesis of salt marsh groundwater studies is lacking. In this review, we summarize drivers mediating salt marsh hydrogeology, review field and modeling techniques, and discuss patterns of exchange. New data from a Delaware seepage meter study are reported which highlight small-scale spatial variability in exchange rates. A synthesis of the salt marsh hydrogeology literature reveals a positive relationship between tidal range and submarine groundwater discharge but not porewater exchange, highlighting the multidimensional drivers of marsh hydrogeology. Field studies are heavily biased towards microtidal systems of the US East Coast, with little global information available. A preliminary estimate of marsh porewater exchange along the Mid-Atlantic and South Atlantic Bights is 8–30 × 1013 L y−1, equivalent to recirculating the entire volume of seawater overlying the shelf through tidal marsh sediments in ~30–90 years. This review concludes with a discussion of critical questions to address that will decrease uncertainty in global budget estimates and enhance our capacity to predict future responses to global climate change.

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Gulzar, Salman, M. Ajmal Khan, and Irwin A. Ungar. "Salt Tolerance of a Coastal Salt Marsh Grass." Communications in Soil Science and Plant Analysis 34, no. 17-18 (November 2003): 2595–605. http://dx.doi.org/10.1081/css-120024787.

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Ormsby, E. "A Salt Marsh Near Truro." Literary Imagination 6, no. 1 (January 1, 2004): 148. http://dx.doi.org/10.1093/litimag/6.1.148.

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Drake, Bert G. "Photosynthesis of salt marsh species." Aquatic Botany 34, no. 1-3 (July 1989): 167–80. http://dx.doi.org/10.1016/0304-3770(89)90055-7.

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Vernberg, F. John. "Salt-marsh processes: A Review." Environmental Toxicology and Chemistry 12, no. 12 (December 1993): 2167–95. http://dx.doi.org/10.1002/etc.5620121203.

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de Groot, Alma V., Roos M. Veeneklaas, and Jan P. Bakker. "Sand in the salt marsh: Contribution of high-energy conditions to salt-marsh accretion." Marine Geology 282, no. 3-4 (April 2011): 240–54. http://dx.doi.org/10.1016/j.margeo.2011.03.002.

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Дисертації з теми "Salt marsh"

Fritz, Alyce T. "Trophodynamics of estuarine (salt marsh) heterotrophic nanoplankton (microbial ecology, salt marsh ecology, choanoflagellates, Virginia)." W&M ScholarWorks, 1986. https://scholarworks.wm.edu/etd/1539616651.

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Seasonal occurrence and activity of heterotrophic nanoflagellates (HNANO or heteroflagellates) and bacteria were studied in a sheltered brackish water embayment of Chesapeake Bay wetlands (Virginia, USA) over a three year period (1981 - 1984). Epifluorescence direct counts and Scanning and Transmission Electron Microscopy (SEM and TEM) techniques were used for the description of organisms, enumeration, and biomass determinations. Seasonal bacterial growth rates and growth and grazing rates of bactivorous HNANO were estimated using diffusion chambers equipped with Nuclepore polycarbonate membrane filters in natural salt marsh tidal pools. Environmental monitoring of nanoplankton populations revealed a seasonal pattern of bacterial abundances with temperature while heteroflagellate abundances and growth rates showed no seasonal pattern nor correlation with fluctuations in bacterial densities. Heteroflagellate populations were dominated by 34 to 50 (mu)m('3) sized monads, choanoflagellates, bodonids, and Paraphysomonas sp., all found in varying abundances throughout the year. Blooms were concurrent with extended low tide or specific bacterial populations (i.e., cyanobacteria) typical of spring and autumn periods. Heteroflagellate growth in diffusion chambers reflected the environmental blooms and increased diversity of low water assemblages. Growth and grazing rates of heteroflagellates at ambient densities thus could account for 20 to 80% of daily bacterial carbon production. Although heteroflagellate ingestion rates did not regulate seasonal bacteria densities or vice versa, maximum growth of bacteria and heteroflagellates in chambers was closely coupled. Heteroflagellate grazing activity may regulate the rate of bacterial production by preventing substrate limitation and maintaining the population in an active growth phase. The seasonal study demonstrated the dynamic nature of nanoplankton populations during autumn and spring transitional periods. SEM photomicroscopy revealed that the dominant component of spring blooms may be composed of several members of the loricate choanoflagellate family, Acanthoecidae. Using modified EM techniques, eleven Acanthoecidae choanoflagellates species, identified from spring in situ chamber experiments, were described. In situ growth and grazing rates for the spring chamber populations ranged from 0.023 h('-1) to 0.196 h('-1) and 40 to 210 bacteria h('-1) respectively. These high rates represent an opportunistic response to optimum conditions and an expression of maximum grazing potential. (Abstract shortened with permission of author.).

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Marshall, William Alderman. "Geochronology of salt-marsh sediments." Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/2826.

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Salt-marsh sediments can provide important achives of past sea levels if they can be securely dated. This thesis investigates eight methods for dating salt-marsh sediments. These include traditional and established dating methods (¹⁴C dating and the radionuclides ¹³⁷Cs and ²¹ºPb) and more novel approaches to dating the deposition of salt-marsh sediments (palaeomagnetic dating, the use of' atmospheric stable lead deposition, tephra chronologies, pollen markers, SCP analysis and the use of atmospheric ¹⁴C 'bomb spike' and high-precision AMS ¹⁴C measurements). Sites were selected to provide contrasting sediment sequences that differed both in lithology and accumulation rates and included salt marshes from the Taf estuary (southwest Wales), the Arne Peninsula (southern England) and Vioarholmi (western Iceland). The investigations in the Taf estuary produced the first palaeomagnetic chronology from a salt marsh. From the Arne Peninsula this thesis reports the first successful use of bomb-spike calibrated ¹⁴C analyses in a salt marsh as well as high-precision AMS ¹⁴C ages for the 'problem' period AD 1700-1950. Stable Pb analysis at all three sites produced a number of chronological markers that signalled the timing of increases in industrial Pb emissions, and the later use of Pb petrol additives during the 20th century. In addition, a unique isotopic signal, attributed to the working of Pb metal during the height of the Roman Empire in Europe, was found in the Icelandic sediments. The radionuclides ²¹ºPb and ¹³⁷Cs produced precise chronologies for the last 100 yr in the Taf estuary. However, post-depositional mobility of ¹³⁷Cs on the Arne Peninsula and low ²¹ºPb concentrations at Vioarholmi prevents the construction of reliable ²¹ºPb and ¹³⁷Cs chronologies. In contrast, the use of tephra at Vioarholmi, and pollen and spheroidal carbonaceous particle markers on the Arne Peninsula, showed great potential as independent unique-event dating tools that could be used to constrain conventional ¹⁴C calibrations. Finally, the chronological information produced by all the individual methods was combined to construct an integrated chronology for each site. This approach significantly reduced age uncertainties and produced higher resolution, and more robust, salt-marsh sedimentation histories

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Nuttle, William Kensett. "Elements of salt marsh hydrology." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/14991.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Includes bibliographies.
by William Kensett Nuttle.
Ph.D.

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Pepper, Margaret A. "Salt marsh bird community responses to open marsh water management." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 61 p, 2008. http://proquest.umi.com/pqdweb?did=1597631021&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Bin, Yasin Z. "The ecology of salt marsh control." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381722.

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Reed, D. J. "Suspended sediment transport in salt marsh creeks." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355891.

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Husain, Mohd Lokman bin. "Salt marsh sedimentary response to sea level rise." Thesis, University of Hull, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384865.

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Tobias, Craig 1967. "Nitrate reduction at the groundwater - salt marsh interface." W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539616877.

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The influence of groundwater discharge on the hydrology and biogeochemical cycling of nitrogen in a fringing intertidal wetland was studied by characterizing groundwater discharge, determining N-cycling rates in cores, and examining nitrate reduction in situ using 15N enrichment and natural gradient tracer techniques. Groundwater discharge was estimated by three independent methods: Darcy's Law, a water/salt mass balance, and a subsurface tracer test. Seasonal patterns of discharge predicted by Darcy's Law and the mass balance were similar. Discharge maxima and minima occurred in April and September, respectively. The water/salt mass balance provided the more reasonable estimate of groundwater flux at high flows, and the Darcy technique was better at estimating low flow at our site. The high discharge seasonally purged porewater from the marsh to the estuary, and marsh processing of groundwater solute loads would occur only during this period. Mineralization, nitrification, potential denitrification (DNF), and potential dissimilatory nitrate reduction to ammonium (DNRA) rates were estimated in cores during periods of high and low groundwater discharge. All N-cycling processes occurred in sediments <1.5 meters deep. Natural abundance isotope measures, and core experiments indicated that coupled nitrification-denitrification was a sizeable sink for mineralized N. Mineralization, nitrification, and DNRA rates were 6--12x greater during Spring high discharge. DNF rates, were 10x higher during Fall low discharge. Despite accelerated mineralization and nitrification during high discharge, the DNF:DNRA ratio was <1, indicating that more of the N cycled through nitrification was retained as ammonium rather than exported as dinitrogen through coupled nitrification-denitrification. Nitrate reduction pathways in the marsh were studied in situ by creating a nitrate plume enriched in 15N. Isotopic enrichment of the ammonium, PON, dissolved nitrous oxide, and dissolved dinitrogen pools initially accounted for 14--36% of the observed nitrate loss. Adjustment of these estimates with potential losses through gas evasion, and ammonium turnover, accounted for nearly all of the N missing from the mass balance. The adjusted mass balance indicated that 68% of the nitrate load was denitrified, and 30% was assimilated and retained in the marsh.

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Miller, Carrie J. "Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1392.

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Sibley, Samuel D. Jr. "The Impact of Salt Marsh Hydrogeology on Dissolved Uranium." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7262.

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We quantified U removal and investigated the efficacy of uranium as a quantitative tracer of groundwater discharge in a headwater salt marsh of the Okatee River, Bluffton, SC. Determining the magnitude of U removal is important for advancing U as a tracer of paleo-oceanic conditions. Since salt marsh groundwater is typically enriched in nutrients and other biologically and chemically reactive species, quantifying groundwater discharge from marshes is critical for understanding the ability of salt marshes to modify the chemistry of important species in surface waters. We hypothesized that water-column U(VI) was removed by tidally-induced advection of surface water into permeable, anoxic salt marsh sediments, a process resulting in bacterially-mediated precipitation of insoluble U(IV)O2 and/or sorption of uranium to iron-oxides at the oxic/anoxic sediment interface. Furthermore, we suggested that hydraulic pressure gradients established by marsh-surface tidal inundation and seasonally-variable rainfall promote the discharge of salt-marsh-processed, uranium-depleted groundwater to tidal creeks, producing the surface-water U-removal signal. Groundwater and surface water data revealed non-conservative uranium behavior. We documented extensive uranium removal from shallow marsh groundwater and seasonally variable uranium removal from surface waters. These observations allowed for the calculation of seasonally-dependent salt marsh uranium removal rates. On a yearly basis, our removal rate (58 to 104 mol m-2 year-1) reemphasized the importance of anoxic coastal environments for U removal. High uranium removal, high barium concentration water observed seeping from creek banks at low tide supported our hypothesis that groundwater discharge must contribute to uranium removal documented in tidal surface waters. Average site groundwater provided an analytically reasonable endmember for explaining uranium depletion in surface water. Therefore, we used three endmember mixing models for estimating the fraction of surface water with presumed a groundwater signature. Our discharge estimates of 8 to 37 L m-2 day-1 agreed closely with previously published salt marsh values. Seasonality in discharge rates can be rationalized with appeal to seasonal patterns in observed rainfall, tidal forcing, and marsh surface bioturbation. Although more work is needed, the results of this portion of the study suggest that U may be an effective quantitative tracer of groundwater discharge from salt marshes.

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Книги з теми "Salt marsh"

Fleisher, Paul. Salt marsh. New York: Benchmark Books, 1999.

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Lender, Mark Seth. Salt marsh diary. New York: St. Martin's Press, 2011.

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Luis, Anento Jorge, Selfa Jesús, and Jiménez Ricardo, eds. Las saladas de Alcañiz. [Zaragoza]: Consejo de Protección de la Naturaleza de Aragón, 1997.

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Wiegert, Richard G. Tidal salt marshes of the southeast Atlantic Coast: A community profile. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service, 1990.

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Warren, R. Scott. Salt marsh plants of Long Island Sound. Groton, CT: Connecticut Sea Grant College Program, 2009.

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Niedowski, Nancy L. New York State salt marsh restoration and monitoring guidebook. Albany, N.Y: Dept. of State, Division of Coastal Resources, 2000.

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Drociak, Jen. Life in New Hampshire salt marshes: A quick-reference field guide. 2nd ed. Portsmouth, N.H: N.H. Dept. of Environmental Serivces Coastal Program, 2005.

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H, Allen Hollis, Webb J. W, and Dredging Operations Technical Support Program (U.S. Army Engineer Waterways Experiment Station. Environmental Laboratory), eds. Guidelines for vegetative erosion control on wave-impacted coastal dredged material sites. Vicksburg, Miss: US Army Corps of Engineers, Environmental Laboratory, 1990.

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Ferren, Wayne R. Carpinteria Salt Marsh: Environment, history, and botanical resources of a Southern California estuary. Santa Barbara, CA: Herbarium, Dept. of Biological Sciences, University of California, Santa Barbara, 1985.

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International Institute for Aerospace Survey and Earth Sciences. and Netherlands Institute of Ecology, eds. Dynamics of salt marsh vegetation. Enschede, The Netherlands: ITC, 1992.

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Частини книг з теми "Salt marsh"

Healy, Terry R. "Salt Marsh." In Encyclopedia of Earth Sciences Series, 1459–60. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_264.

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Healy, Terry R. "Salt Marsh." In Encyclopedia of Earth Sciences Series, 1–2. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-48657-4_264-2.

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Healy, Terry R., Katherine Stone, Orville Magoon, Billy Edge, Lesley Ewing, Andrew D. Short, Dougals L. Inman, et al. "Salt Marsh." In Encyclopedia of Coastal Science, 819–20. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_264.

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Weis, Peddrick. "Salt Marsh Accretion." In Encyclopedia of Estuaries, 513–15. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_28.

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Bartholdy, Jesper. "Salt Marsh Sedimentation." In Principles of Tidal Sedimentology, 151–85. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0123-6_8.

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Raghukumar, Seshagiri. "The Salt Marsh Ecosystem." In Fungi in Coastal and Oceanic Marine Ecosystems, 87–101. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54304-8_6.

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Bakker, Jan Pouwel. "The Schiermonnikoog salt marsh." In Nature Management by Grazing and Cutting, 75–87. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2255-6_4.

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Bakker, Jan Pouwel. "The salt marsh vegetation." In Nature Management by Grazing and Cutting, 185–235. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2255-6_7.

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Chaffee, Caitlin, Wenley Ferguson, and Marci Cole Ekberg. "Salt Marsh Restoration in Rhode Island." In Tidal Marsh Restoration, 157–64. Washington, DC: Island Press/Center for Resource Economics, 2012. http://dx.doi.org/10.5822/978-1-61091-229-7_9.

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Durey, Hunt, Hunt Durey, Timothy Smith, and Marc Carullo. "Restoration of Tidal Flow to Salt Marshes:." In Tidal Marsh Restoration, 165–72. Washington, DC: Island Press/Center for Resource Economics, 2012. http://dx.doi.org/10.5822/978-1-61091-229-7_10.

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Тези доповідей конференцій з теми "Salt marsh"

Dong, Di, Huamei Huang, Bingxin Guo, Jia Yang, Qing Gao, Zheng Wei, and Yuchao Sun. "Mangrove and Salt Marsh Detection in a Mangrove-saltmarsh Ecotone Using Segment Anything Model from Drone Imagery." In 2024 Photonics & Electromagnetics Research Symposium (PIERS), 1–7. IEEE, 2024. http://dx.doi.org/10.1109/piers62282.2024.10618207.

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Rossiello, Camille, and Alicia M. Wilson. "GROUNDWATER FLOW AND SALT MARSH MIGRATION: THE FOREST/MARSH BOUNDARY." In Joint 72nd Annual Southeastern/ 58th Annual Northeastern Section Meeting - 2023. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023se-385344.

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Riley, Beth, and Iris Möller. "Mapping Salt Marsh Margins – a Methodological Comparison." In 8th International Coastal Management Conference. ICE Publishing, 2016. http://dx.doi.org/10.1680/cm.61149.109.

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Adams, Christopher S., and Christopher P. Benosky. "2,400 Hectares of Salt Marsh Wetland Restoration." In Wetlands Engineering and River Restoration Conference 1998. Reston, VA: American Society of Civil Engineers, 1998. http://dx.doi.org/10.1061/40382(1998)64.

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Suzuki, Tomohiro, Jasper Dijkstra, and Marcel J. F. Stive. "WAVE DISSIPATION ON A VEGETATED SALT MARSH." In Proceedings of the 31st International Conference. World Scientific Publishing Company, 2009. http://dx.doi.org/10.1142/9789814277426_0028.

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Gross, M. F., V. Klemas, and M. A. Hardisky. "Long-term remote monitoring of salt marsh biomass." In Orlando '90, 16-20 April, edited by James A. Smith. SPIE, 1990. http://dx.doi.org/10.1117/12.21390.

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Cohen, Michael, Alan W. Geyer, Garret Rees, and Daria Nikitina. "GEOMORPHIC ANALYSIS OF DELAWARE BAY SALT MARSH POOLS." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-319074.

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Lee, Yoon-Kyung, Wook Park, Jong-Kuk Choi, Joo-Hyung Ryu, and Joong-Sun Won. "Assessment of TerraSAR-X for mapping salt marsh." In IGARSS 2011 - 2011 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2011. http://dx.doi.org/10.1109/igarss.2011.6049676.

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Powers, Michael, Daria Nikitina, Martin F. Helmke, Magnus Payzine, and Cameron Knight. "TIDES, GROUNDWATER FLOW AND SALT POND DEVELOPMENT AT SLAUGHTER BEACH SALT MARSH, DELAWARE." In Joint 69th Annual Southeastern / 55th Annual Northeastern GSA Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020se-345436.

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Bentz, John Michael. "MODERN DISTRIBUTION OF BENTHIC SALT MARSH FORAMINIFERA, CARPINTERIA SLOUGH." In 112th Annual GSA Cordilleran Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016cd-274624.

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Звіти організацій з теми "Salt marsh"

Schneider, carolyn, Bill Streever, and Rick Medina. Salt Marsh Planting: Example Contract Specifications. Fort Belvoir, VA: Defense Technical Information Center, March 2000. http://dx.doi.org/10.21236/ada376930.

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Russ, Emily, Taylor Cagle, and Todd Swannack. Considerations for integrating ecological and hydrogeomorphic models : developing a comprehensive marsh vegetation model. Engineer Research and Development Center (U.S.), January 2024. http://dx.doi.org/10.21079/11681/48131.

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Predictive models for salt marsh management require a systems perspective that recognizes the dynamic interactions between physical and ecological processes. It is critical to link physical process and landscape evolution models to quantify hydro-eco-geomorphic feedbacks in marsh environments. A framework that explicitly defines how to integrate these disparate models is a necessary step towards developing a comprehensive marsh model. This technical note (TN) proposes an approach to integrate existing hydrodynamic and geomorphic models with a mechanistic vegetation model into a coupled framework to better simulate salt marsh evolution.

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Robertson-Rojas, Vanessa. Do Fungal Symbionts of Salt Marsh Plants Affect Interspecies Competition? Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7451.

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Runion, Kyle, Safra Altman, and Elizabeth Murray. Analytic methods for establishing restoration trajectories. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45562.

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This special report identifies metrics (standard and novel) and analytic approaches to developing trajectories and then describes the conceptual process of using those metrics and approaches to develop restoration trajectories to inform adaptive management in salt-marsh systems. We identify the composite time series trajectory (CTST) approach, in which metrics are measured from restoration sites of different ages within a small spatial range, and the retrospective single-site trajectory (RSST) approach, in which the same restoration metrics are measured over time at one restoration site. In all, we assessed the metrics of 39 studies of salt-marsh restoration in the United States between 1991 and 2019.

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Huiskes, A. H., and J. Nieuwenhuize. Uptake of Heavy Metals from Contaminated Soils by Salt-Marsh Plants. Fort Belvoir, VA: Defense Technical Information Center, May 1985. http://dx.doi.org/10.21236/ada157174.

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Mercer, Charlene. Spatial Segregation of the Sexes in a Salt Marsh Grass Distichlis spicata (Poaceae). Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.173.

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Paxton, Barton, and Chance Hines. Black rail inventory at Cape Lookout and Cape Hatteras national seashores. National Park Service, 2024. http://dx.doi.org/10.36967/2304485.

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The black rail (Laterallus jamaicensis) is the most secretive of the secretive marsh birds and one of the least understood species in North America. On the east coast, eastern black rails historically bred in tidal and freshwater marshes along the Atlantic coast from Massachusetts, south to Florida. Within the mid-Atlantic region suitable black rail habitat is concentrated in the high marsh along the upper elevational zone of salt marshes. This zone is dominated by salt meadow hay (Spartina patens), saltgrass (Distichlis spicata), and is often interspersed with shrubs such as marsh elder (Iva frutescens) or saltbush (Baccharis hamilifolia). North Carolina has been a stronghold for eastern black rails within the mid-Atlantic region, with the marsh complexes associated with the lower Pamlico sound supporting one of largest concentrations and highest densities of eastern black rails throughout their range. However, even within these marshes, eastern black rail populations have experienced declines marked by reductions in occupied sites and decline in numbers within historic strongholds. Evidenced by increasing confinement to the highest portions of the high marsh in recent years, sea-level rise and increased rates of high marsh inundation are likely a major contributing factor to declines. With the population of eastern black rails declining over 75% in the last 10-20 years, the U. S. Fish and Wildlife Service formally listed the eastern black rail as threatened under the endangered species act on 9 November 2020 (USFWS 2020). To fulfill the need for information to guide management decisions on projects at Cape Lookout and Cape Hatteras National Seashores and to aide in (potential?) future designations of critical habitat, we conducted widespread, systematic surveys for black rails and other secretive marsh birds within the parks during the breeding seasons of 2022 and 2023. A total of 1,222 surveys were conducted at 431 points over the course of 2 years. In addition to recording detections of all focal species, we recorded detections of 6 eastern black rails on North Core Banks where they were not previously known to occur. The population of black rails occupying the high marsh habitat on North Core Banks could account for 5-10% of the North Carolina black rail population and increase the known sites occupied within the state.

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Racine, Charles H., Marianne E. Walsh, Charles M. Collins, Susan Taylor, Bill D. Roebuck, Leonard Reitsma, and Ben Steele. Remedial Investigation Report: White Phosphorus Contamination of Salt Marsh Sediments at Eagle River Flats, Alaska. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada250515.

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Racine, Charles H., Marianne E. Walsh, Charles M. Collins, and Susan Taylor. Remedial Investigation Report: White Phosphorus Contamination of Salt Marsh Sediments at Eagle River Flats, Alaska. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada250899.

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Berkowitz, Jacob, Christine VanZomeren, and Nicole Fresard. Rapid formation of iron sulfides alters soil morphology and chemistry following simulated marsh restoration. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42155.

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Many marshes show signs of degradation due to fragmentation, lack of sediment inputs, and erosion which may be exacerbated by sea level rise and increasing storm frequency/intensity. As a result, resource managers seek to restore marshes via introduction of sediment to increase elevation and stabilize the marsh platform. Recent field observations suggest the rapid formation of iron sulfide (FeS) materials following restoration in several marshes. To investigate, a laboratory microcosm study evaluated the formation of FeS following simulated restoration activities under continually inundated, simulated drought, and simulated tidal conditions. Results indicate that FeS horizon development initiated within 16 days, expanding to encompass > 30% of the soil profile after 120 days under continuously inundated and simulated tidal conditions. Continuously inundated conditions supported higher FeS content compared to other treatments. Dissolved and total Fe and S measurements suggest the movement and diffusion of chemical constituents from native marsh soil upwards into the overlying sediments, driving FeS precipitation. The study highlights the need to consider biogeochemical factors resulting in FeS formation during salt marsh restoration activities. Additional field research is required to link laboratory studies, which may represent a worst-case scenario, with in-situ conditions.

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