Filters: Tags: VARIABILITY (X)
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The rates and styles of channel adjustments following an abrupt and voluminous sediment pulse are investigated in the context of site and valley characteristics and time-varying sediment transport regimes. Approximately 10.5 x 106m3 of stored gravel and sand was exposed when Barlin Dam failed during Typhoon WeiPa in 2007. The dam was located on the Dahan River, Taiwan, a system characterized by steep river gradients, typhoon- and monsoon-driven hydrology, high, episodic sediment supply, and highly variable hydraulic conditions. Topography, bulk sediment samples, aerial photos, and simulated hydraulic conditions are analyzed to investigate temporal and spatial patterns in morphology and likely sediment transport...
Categories: Publication;
Types: Citation;
Tags: Barlin Dam,
CALIFORNIA,
CHANNEL RESPONSE,
CREEK,
DEPOSITION,
Coefficient of variation (in percent) of modeled monthly discharge for the period 1993-2002 for major rivers. This dataset is based on a reconstruction of terrestrial discharge for the last century using a macro-scale hydrological model forced with observed global climate data.
Note:  The contents of this map are still under development and are being made available for illustration purposes only.  These data are not to be used without permission by the map author.Risk of altered ecologically significant components of the flow regime due to human impacts. The SARP Flow Alteration Assessment provides a regional characterization of the distribution and risk of altered flow regimes at the NHD+ segment scale. The human impacts include runoff from impervious surfaces, evaporative losses from artificial water bodies, and surface water use. Impacts of these activities on selected ecologically significant components of the flow regime are given in the attached document. These flow components...
Observed Annual Average Temperature, 1961 to 1990. Data from the Bias-Corrected Spatial Disaggregation (BCSD) gridded observational database, BCSD downscaling, 12 km (7.5 mi) resolution. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated...
Observed Annual Average Temperature, 1961 to 1990. Data from the Bias-Corrected Spatial Disaggregation (BCSD) gridded observational database, BCSD downscaling, 12 km (7.5 mi) resolution. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated...
Data were collected from an experimental greenhouse study in which Lepidium draba plants were grown from root cuttings to create plants at different ontogenic stages. Plants were arranged in mixed-age and single-age stands and exposed to the Lepidopteran herbivore, diamondback moth caterpillars. The success (biomass gain and surivival) of herbivores, the amount of feeding, and the growth of plants were recorded as responses to ontogenic stage. In addition, glucosinolates (a group of secondary metabolites known to act as defenses against herbivores) were quantified on plants of differing ontogenic stage.
Categories: Data;
Tags: Colorado,
Ecology,
USGS Science Data Catalog (SDC),
biota,
diamondback moth,
Data were collected from two laboratory rearing experiments conducted in 2018 of Trichoplusia ni caterpillars that had been parasitized by Copidosoma floridanum parasitoids. In the first experiment, parasitized caterpillars were fed artificial diets spiked with increasing concentrations of the phytochemical xanthotoxin in order to assess the effect of xanthotoxin on parasitoid success. In the second experiment, parasitized caterpillars were switched between diets with differing xanthotoxin concentration, such that all caterpillars experienced the same mean xanthotoxin concentration over their lives, but different treatments experienced different variability in xanthotoxin concentration. Data were recorded on caterpillar...
Categories: Data;
Tags: USGS Science Data Catalog (SDC),
biota,
chemical ecology,
herbivory,
parasitoid,
For each pixel, the geodesic distance and the vertical distance to the closest weather station for precip and for temp were calculated. These three dimensions were combined into a single one for precip and one for temp based on the Euclidean distance. The less distance there is these 3 dimensions (x,y,z), the less uncertainty there is. Higher values mean more uncertainty.
River classification by months of high and low flow and range of variability.  The flow season classes are based on a multivariate clustering analysis of monthly flows for reference USGS gages in the 14 states of the SARP region.For more information about the hydrologic classes and how this attribute was developed for the Southern Instream Flow Network (SIFN), go to http://www.southeastaquatics.net/sarps-programs/sifn/instream-flow-resources.Your comments about this data layer are welcome.  Please send comments to the map author using the Comment tab below
This dataset is based on the time series data for the NCDC and the FAOCLIM2 combined datasets stations measuring at least 30 years or more. For each month the coefficient of variation for precipitation was calculated. For each month the standard deviation for temperature was calculated. These values were interpolated using spline for each month, a total of 24 layers. The 12 coefficient of variation interpolated layers derived from precip, were combined using the standard Euclidean distance. The 12 standard deviation interpolated layers derived from temp, were combined using the standard euclidean distance. Higher values indicate more variability (higher uncertainty).
This dataset is based on the time series data for the NCDC and the FAOCLIM2 combined datasets stations measuring at least 30 years or more. For each month the coefficient of variation for precipitation was calculated. For each month the standard deviation for temperature was calculated. These values were interpolated using spline for each month, a total of 24 layers. The 12 coefficient of variation interpolated layers derived from precip, were combined using the standard Euclidean distance. The 12 standard deviation interpolated layers derived from temp, were combined using the standard euclidean distance. Higher values indicate more variability (higher uncertainty).
Longterm (45 years) temporal data were used to assess the influence of spatial scale on temporal patterns of a semi-arid west Texas grassland. Temporal basal area dynamics of common curlymesquite (Hilaria belangeri (Steud.) Nash) collected from permanent plots within two areas that were released from disturbance (longterm overgrazing and drought), were evaluated at two spatial scales (quadrat, site). Wiens (1989) proposed hypotheses to characterize the influence of scale on variability, predictability, and equilibrium. These hypotheses were tested for this grassland and temporal patterns observed were different for each spatial scale. The large scale (site) was characterized by low variation between units, high...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Landscape Ecology,
Springer Netherlands,
chaos,
ecological scale,
equilibrium,
For each pixel, the geodesic distance and the vertical distance to the closest weather station for precip and for temp were calculated. These three dimensions were combined into a single one for precip and one for temp based on the Euclidean distance. The less distance there is these 3 dimensions (x,y,z), the less uncertainty there is. Higher values mean more uncertainty.
Improving the quality of habitat for western big-game species, such as elk and mule deer, was identified as a priority by the Department of the Interior in 2018. Maintaining healthy herds not only supports the ecosystems where these species are found, but also the hunting and wildlife watching communities. For example, in Wyoming, big game hunting contributed over $300 million to the state’s economy in 2015. Yet as climate conditions change, the quantity, quality, and timing of vegetation available to mule deer, elk, and other ungulates, known as forage, could shift. It’s possible that these changes could have cascading impacts on the behavior and population sizes of many species. A key strategy used by managers...
Categories: Project;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 2018,
CASC,
Completed,
EVI,
IRG,
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