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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Can The Merpas Passive Air Sampler Discriminate Landscape, Seasonal, And Elevation Effects On Atmospheric Mercury? A Feasibility Study In Mississippi, Usa, Byunggwon Jeon, James V. Cizdziel
Can The Merpas Passive Air Sampler Discriminate Landscape, Seasonal, And Elevation Effects On Atmospheric Mercury? A Feasibility Study In Mississippi, Usa, Byunggwon Jeon, James V. Cizdziel
Faculty and Student Publications
© 2019 by the authors. Accurately measuring gaseous elemental mercury (GEM) concentrations in the atmosphere is important to understand its sources, cycling, distribution, and temporal trends. The MerPAS passive air sampler from Tekran Inc. (Toronto, ON, Canada) captures GEM on sulfur-impregnated activated carbon after it passes through a Radeillo diffusive barrier. Because they are small, relatively low in cost, and require no power, they can be deployed at multiple locations, yielding a much greater spatial resolution, albeit at coarser temporal resolution, compared to active sampling. In this study, we used the MerPAS to measure GEM concentration gradients at a mixed …
Floodplains Provide Important Amphibian Habitat Despite Facing Multiple Ecological Threats, Meredith A. Holgerson, Adam Duarte, Marc P. Hayes, Michael J. Adams, Julie A. Tyson, Keith A. Douville, Angela Strecker
Floodplains Provide Important Amphibian Habitat Despite Facing Multiple Ecological Threats, Meredith A. Holgerson, Adam Duarte, Marc P. Hayes, Michael J. Adams, Julie A. Tyson, Keith A. Douville, Angela Strecker
Environmental Sciences Faculty and Staff Publications
Floodplain ponds and wetlands are productive and biodiverse ecosystems, yet they face multiple threats including altered hydrology, land use change, and non-native species. Protecting and restoring important floodplain ecosystems requires understanding how organisms use these habitats and respond to altered environmental conditions. We developed Bayesian models to evaluate occupancy of six amphibian species across 103 off-channel aquatic habitats in the Chehalis River floodplain, Washington State, USA. The basin has been altered by changes in land use, reduced river–wetland connections, and the establishment of non-native American bullfrogs (Rana catesbeiana = Lithobates catesbeianus) and centrarchid fishes, all of which we …
Air/Surface Exchange Of Gaseous Elemental Mercury At Different Landscapes In Mississippi, Usa, James V. Cizdziel, Yi Zhang, Divya Nallamothu, J. Stephen Brewer, Zhiqiang Gao
Air/Surface Exchange Of Gaseous Elemental Mercury At Different Landscapes In Mississippi, Usa, James V. Cizdziel, Yi Zhang, Divya Nallamothu, J. Stephen Brewer, Zhiqiang Gao
Faculty and Student Publications
© 2019 by the authors. Mercury (Hg) is a global pollutant with human health and ecological impacts. Gas exchange between terrestrial surfaces and the atmosphere is an important route for Hg to enter and exit ecosystems. Here, we used a dynamic flux chamber to measure gaseous elemental Hg (GEM) exchange over different landscapes in Mississippi, including in situ measurements for a wetland (soil and water), forest floor, pond, mowed field and grass-covered lawn, as well as mesocosm experiments for three different agricultural soils. Fluxes were measured during both the summer and winter. Mean ambient levels of GEM ranged between 0.93-1.57 …
Evaluating Restoration Success By Tracking The Structural And Functional Recovery Of Restored, Drained, And Intact Wetlands, Renee C. Howard
Evaluating Restoration Success By Tracking The Structural And Functional Recovery Of Restored, Drained, And Intact Wetlands, Renee C. Howard
Electronic Thesis and Dissertation Repository
Wetland restoration efforts have increased on the Canadian prairies to compensate for widespread loss of wetland area, form, and function. Restoration activity presumes a direct replacement for natural wetlands, where restored wetlands provide equivalent ecological functions and services. However, restoration projects often show limited recovery success in biological structure and biogeochemical function. Using plant functional traits is an emerging approach to assessing ecological process and may provide a better indicator of wetland functional recovery than vegetation structural indicators alone. Here, I tracked vegetation structural metrics (i.e., species richness, composition, and cover) and plant functional traits over a chronosequence of restored …
The Soda Lakes Of Nhecolândia: A Conservation Opportunity For The Pantanal Wetlands, Renato L. Guerreiro, Ivan Bergier, Michael M. Mcglue, Lucas V. Warren, Urbano Gomes Pinto De Abreu, Jônatas Abrahão, Mario L. Assine
The Soda Lakes Of Nhecolândia: A Conservation Opportunity For The Pantanal Wetlands, Renato L. Guerreiro, Ivan Bergier, Michael M. Mcglue, Lucas V. Warren, Urbano Gomes Pinto De Abreu, Jônatas Abrahão, Mario L. Assine
Earth and Environmental Sciences Faculty Publications
The Pantanal is the most conserved biome in Brazil and among the last wild refuges in South America, but intensification of agriculture and other land use changes present challenges for protecting this exceptionally biodiverse wetland ecosystem. Recent studies have shed new light on the origins and biogeochemistry of a suite of >600 small saline-alkaline lakes in Nhecolândia, a floodplain setting located south of the Taquari River in south-central Pantanal. These soda lakes form a unique aquatic environment in Pantanal and nascent research on their geomicrobiology suggests that their biota may be analogous to early life, and extreme life in Earth's …