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Based on three critical criteria – soil, hydrology, and vegetation, this study examined contemporary playa wetland conditions to determine the extent of wetland degradation in the Rainwater Basin in south-central Nebraska. Geospatial statistics were used to evaluate the changes between historical hydric soil footprints and the most recent wetland survey datasets. The results indicate that the historical...
We investigated the inter-annual and seasonal variation of the aboveground net primary productivity (ANPP), and leaf nitrogen and phosphorus concentrations across two different types of wet meadows (spring-fed and riparian) in Tierra del Fuego Island, Southern Patagonia. In addition, we estimated grazing effects on ANPP, the nature of nutrient limitation, and the resorption efficiencies for both nutrients...
This study assesses and detects land use/cover (LUC) and land surface temperature (LST) change using multi-temporal Landsat TM satellite data. NDVI, albedo and MNDWI were used to analyze the LST qualitatively. The results revealed that the accuracy of LST measurements in watershed is within 1.5 °C. Then, temperature changes between 1998 and 2011 were analyzed. The classifications of land surface temperatures...
Wetlands within tallgrass prairie are among the most endangered ecosystems in North America and serve as critical habitat for many sensitive and endemic species. Although loss of these habitats has acutely affected reptiles and amphibians, most prairie restoration initiatives take an ecosystem restoration approach adapted for plant and/or game species, with few focusing particularly on herpetofauna...
Floodplains are among the world’s economically-most-valuable, environmentally-most-threatened, and yet conceptually-least-understood ecosystems. Drawing on concepts from existing riverine and wetland models, and empirical data from floodplains of Atlantic Coast rivers in the Southeastern US (and elsewhere when possible), we introduce a conceptual model to explain a continuum of longitudinal variation...
Local perceptions of landscape attributes are recognized as critical in the evaluation of multifunctional territories; however, case studies in the urban wetlands context are limited. This study assesses socioeconomic, environmental and regional management variables that may directly and indirectly affect local population’s perceptions, altering stakeholders concerns for defining urban wetland management...
In vegetated wetland ecosystems, plants can be a dominant pathway in the atmospheric flux of methane, a potent greenhouse gas. Although the roles of herbaceous vegetation and live woody vegetation in this flux have been established, the role of dead woody vegetation is not yet known. In a restored wetland of North Carolina’s coastal plain, static flux chambers were deployed at two heights on standing...
Estimates of rates of wetland loss are important for understanding whether wetland policies meet their objectives. In Alberta, a no-net-area loss interim wetland policy was introduced in 1993. We tested the effectiveness of this interim wetland policy. A historical wetland inventory was established by generating a wetland inventory using digital topographic analysis and calculating a wetland-area...
This study main goal was to characterize biodiversity in tropical pristine wetlands of two protected areas from central Brazil under a multi-taxonomic approach, with special interest on the distribution and identity of those taxa that most represent these reference conditions. Samplings were conducted during dry and rainy seasons (2009), in nine wetlands. We reported 114 herbaceous macrophytes, 334...
Tussocks in sedge meadows may be able to support biodiversity because of their structural complexity. We studied Carex meyeriana tussocks to look at their role in creating micro-heterogeneity and supporting biodiversity in northeastern China. We investigated vegetation in paired plots on and between tussocks of C. meyeriana, and measured water depth, soil water content, soil temperature, soil organic...
Groundwater connections from upland-embedded wetlands to downstream waterbodies remain poorly understood. In principle, water from upland-embedded wetlands situated high in a landscape should flow via groundwater to waterbodies situated lower in the landscape. However, the degree of groundwater connectivity varies across systems due to factors such as geologic setting, hydrologic conditions, and topography...
We evaluated growth and physiology of three wetland graminoids (Distichlis spicata, Leymus triticoides, and Juncus arcticus) as affected by surface and subsurface water. These species are common in western USA and were collected from two areas: Bishop, California and Burns, Oregon. Our hypotheses were: 1) the use of surface water by plants is higher than the use of subsurface water and 2) there are...
Rich fens are groundwater dependent, mineral-rich wetlands that support diverse plant assemblages and high densities of rare species. Despite their conservation importance, fens are threatened by habitat loss, altered nutrient regimes, invasive species, and groundwater extraction. Fen conservation is hindered by limited inventory efforts. We used maximum entropy modeling (maxent) to estimate fen distribution...
Zooplankton are an essential component of healthy functioning lake and wetland ecosystems. Despite this, zooplankton communities within constructed treatment wetlands (CTWs) in agricultural landscapes remain unstudied. Taxa richness, total abundances and community composition were evaluated for zooplankton assemblages from three habitat types (lakes, CTWs and drainage ditches) within five intensive...
Large expanses of land across midcontinental North America have been heavily modified by installation of artificial drainage to convert prairie pothole wetlands into tillable areas. Drained potholes are observed as sheetwater wetlands in agricultural fields, are valued by migratory waterbirds, and have only been studied in limited contexts. We evaluated the use of agricultural sheetwater to migratory...
Tidal marshes are important sources of atmospheric methane; however, the processes and mechanisms of diurnal methane flux variations in tidal marshes remain unclear. In this study, we modified the Walter model to simulate diurnal variations of methane fluxes in the Cyperus malaccensis tidal marsh in the Minjiang River Estuary. The sediment environmental variables, relative humidity (RH), and the tide...
We evaluated the forest structure, pore water salinity, geochemical characteristics, grain-size distribution and sediment accumulation rates (SAR) in 15 mangrove sites along the San Pedro Mezquital River, one of the major sources of fresh water supply to the Marismas Nacionales System. Sediments were sandy-silty with high organic matter content (5.8 ± 1.5% to 23.6 ± 1.7%). The marine (Na, Cl and Br)...
The prairie pothole region covers 700,000 km2 of North America and once contained millions of pothole wetlands but agricultural drainage was used to convert many these wetlands to agriculture. Termed “drained wetlands” in this study, groundwater hydrology and quality beneath these pothole depressions is poorly understood. In this study we characterized water table levels and nutrient concentrations...
Approximately 95 % of nearly 4 million acres of wetlands located in Iowa’s portion of the Prairie Pothole Region (Des Moines Landform Region) are currently drained and farmed for row-crop agriculture. Many of these wetland basins are too wet to produce consistent crop yields and too dry to function as ecologically intact wetlands. Little information currently exists that documents what, if any value,...
The vast majority of prairie-pothole wetlands in a region that extends from northcentral Alberta in Canada to central Iowa in the United States have been drained to facilitate agricultural crop production. However, many of these drained wetlands continue to pond surface water immediately following snowmelt or heavy rains, making them too wet to provide a consistent crop and yet too dry to function...
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