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19,493 results for “Populism”
Modeling Viability of Avian Populations in the Southern Appalachians: Potential impacts of Climate Change from 2002 to 2004
There is a general consensus that the global climate has slowly warmed (0.6 degrees C) over the past 100 years and that this trend will continue at an accelerated rate over the next 100 years (1 degree to 6 degrees C) (Kattenburg et al. 1996). Aside from the mean annual increase in temperature, the frequency of weather extremes, such as heat waves, drought, and tropical storms are projected to increase across North America over the next century (Easterling et al. 2000). Past changes in temperature and precipitation have been accompanied by changes in insect and vertebrate distributions from both tropical and temperate environments (Parmesan 1996, Pounds et. Al 1999). We have developed bird-habitat models that allow us to predict the occurrences of species in specific forest types within and across national forests within the Blue Ridge physiographic province with a high degree of accuracy (Linder et al. submitted). These models categorize habitat as unsuitable, marginal or high quality as determined by the rate of occupancy over five years of point count data. We will validate our occurrence models with reproductive data. We hypothesize that reproductive success will correspond to predicted habitat quality. While stochastic events may obscure patterns in the short-term, long-term reproductive trends should reflect site quality.
Mesoscale variation in fish populations in two small Appalachian streams (fish population data) at the Coweeta Hydrologic Laboratory in 1996
We examined the reach-scale distributions of three fish species to determine which biotic and abiotic factors are influential in the fishes distributions.
Mesoscale variation in fish populations in two small Appalachian streams (light data) at the Coweeta Hydrologic Laboratory in 1996
We examined the reach-scale distribution of macroinvertebrates to determine if photosynthetically active radiation (PAR) is influential in the distribution of the macroinvertebrates and macroinvertebrate functional feeding groups.
MCR LTER: Coral Reef: Population Dynamics: Adult threespot dascyllus and their host anemones, ongoing since 1992
These data describe the abundance of adult-stage three-spot dascyllus (Dascyllus trimaculatus), a planktivorous damselfish, and their juvenile microhabitat, the sea anemone Heteractis magnifica. Surveys were begun in 1992 and have been conducted two to four times annually by the same observer in the lagoons of the north shore of the island of Moorea in French Polynesia.
Coyote Population Densities at the Sevilleta National Wildlife Refuge, New Mexico (1992-2004)
This study measured the population dynamics of coyotes in the grasslands and creosote shrublands of McKenzie Flats, Sevilleta National Wildlife Refuge. The study was begun in January, 1992, and continued quarterly each year. Coyotes were sampled via scat counts along the roads of McKenzie Flats during winter, spring, summer, and fall of each year. The entire road transect was 21.5 miles in length. Scat counts over a week period (number of scats/mile/day) in each season along the roads were used to calculate the densities of coyotes (number of coyotes per square kilometer). Results from 1992 to 2002 indicated that autumn was the peak density period of the year, with generally steady declines through the year until the following autumn. Coyote populations appeared to fluctuate seasonally, but remained relatively stable at 0.27 +/- 0.03 (SE) coyotes per km2 during summer periods (this likely represents the "breeding pair" density, during which coyote pairs have set up territories and are raising young, but the pups have not as yet joined the parents in foraging activities).
Rabbit Population Densities at the Sevilleta National Wildlife Refuge, New Mexico (1992-2004)
This study measured the population dynamics of black-tail jackrabbits (Lepus californicus) and desert cottontail rabbits (Sylvilagus auduboni) in the grasslands and creosote shrublands of McKenzie Flats, Sevilleta National Wildlife Refuge. The study was begun in January, 1992, and continued quarterly each year. Rabbits were sampled via night-time spotlight transect sampling along the roads of McKenzie Flats during winter, spring, summer, and fall of each year. The entire road transect was 21.5 miles in length. Measurements of perpendicular distance of each rabbit from the center of the road were used to estimate densities (number of rabbits per square kilometer) via Program DISTANCE. Results from 1992 to 2002 indicated that spring was the peak density period of the year, with generally steady declines through the year until the following spring. Evidence of a long-term "cycle" (e.g., the 11 year cycle reported for rabbits in the Great Basin Desert) did not appear in the Sevilleta rabbit populations.
Burn Exclosure Rodent Population Study at the Sevilleta National Wildlife Refuge, New Mexico (1991-1993)
Small mammal densities were estimated from small mammal recapture data in burned and unburned grassland.
Post-Fire Responses of Perennial Grass Populations at McKenzie Flats, Sevilleta National WIldlife Refuge, New Mexico (1998 and 2001)
We evaluated the effects of a lightning-initiated fire on resprouting responses of perennial grasses at the population level. Following a fire in July 1998, 25 experimental plots were established on the eastern edge of MacKenzie Flats at the Sevilleta National Wildlife Refuge. Ten of these plots were located in a Bouteloua gracilis (blue grama)-dominated site, while 15 were established in an area dominated by Bouteloua eriopoda (black grama). We evaluated basal cover of perennial grasses in systematically positioned quadrats (subsamples) within plots immediately after the fire (last week of July 1998), and in September-October 2001.
Local Adaptation to Freezing in High and Low Latitude Populations of L. tridentata (Sevilleta National Wildlife Refuge, New Mexico; Higuerillas, Mexico) and L. divaricata (Bajada del Diablo and Chamical, Argentina) (2006-2009))
If freezing limits establishment of warm desert shrubs at high latitudes, shrubland distributions may be altered as a result of rising global temperatures. However, variation in plant physiology and morphology can be observed across climate gradients and may be acted on by selection to produce adaptation to local climate conditions, thereby ameliorating low temperature stress. Freezing damage in evergreens is closely linked to vessel size distribution because larger xylem conduits are more likely to become air-filled during freezing. In addition, plastic variation, rather than genetic, may be responsible for differences in freezing tolerance among populations. In order to determine if local adaptation to freezing is present in two species of the genus Larrea, L. tridentata and L. divaricata, we investigated xylem vessel size distributions in field grown L. tridentata adults and saplings grown in a common garden from high latitude (Sevilleta National Wildlife Refuge) and low latitude (Higuerillas, Mexico) sites in the Chihuahuan Desert in North America. High latitude (Bajada del Diablo, Argentina) and low latitude (Chamical, Argentina) populations of Larrea divaricata were selected for investigation from the Monte Desert in South America.
Population Ecology of Banner-Tailed Kangaroo Rats (Dipodomys spectabilis) in a Chihuahuan Desert Grassland at the Sevilleta National Wildlife Refuge, New Mexico (2005-2009)
From March 2005-Februaury 2009, a population of banner-tailed kangaroo rats was monitored using mark-recapture methods. All active kangaroo rat mounds on the 18-ha Nunn Flats site were trapped monthly. All captured individuals were marked and reproductive status and mass were recorded. From February to July 2008 a subset of adult females received supplemental food. This dataset was collected to observe the survivorship, reproduction, and dispersal of banner-tailed kangaroo rats in response to changes in resources and density. Both observational and experimental methods were used to observe how ecological constraints affected juvenile dispersal.
Rabbit Population Dynamics in Chihuahuan Desert Grasslands and Shrublands at the Sevilleta National Wildlife Refuge, New Mexico (1992-present)
This study explores the population dynamics of black-tail jackrabbits (Lepus californicus) and desert cottontail rabbits (Sylvilagus auduboni) in the grasslands and creosote shrublands of McKenzie Flats, Sevilleta National Wildlife Refuge. The study was initiated in January 1992, and continues quarterly each year. Rabbits are sampled via night-time spotlight transect sampling along the roads of McKenzie Flats once during winter, spring, summer, and fall. The route is 21.5 miles long. Measurements of perpendicular distance of each rabbit from the center of the road are used to estimate densities (number of rabbits per square kilometer) via Program DISTANCE. Results from January 1992 to May 2004 indicated that spring was the period of peak density period, with generally steady declines through the rest of the year until the following spring. Evidence of a long-term "cycle" (e.g., the 11-year-cycle reported for rabbits in the Great Basin Desert) does not appear in the Sevilleta rabbit populations.
Gunnison's Prairie Dog Restoration Experiment (GPDREx): Small Mammal Mark-Recapture Population Assessment within Grasslands at the Sevilleta National Widlife Refuge, New Mexico (2013-2014)
Prairie dogs (Cynomys spp.) are burrowing rodents considered to be ecosystem engineers and keystone species of the central grasslands of North America. Yet, prairie dog populations have declined by an estimated 98% throughout their historic range. This dramatic decline has resulted in the widespread loss of their important ecological role throughout this grassland system. The 92,060 ha Sevilleta NWR in central New Mexico includes more than 54,000 ha of native grassland. Gunnison’s prairie dogs (C. gunnisoni) were reported to occupy ~15,000 ha of what is now the SNWR during the 1960’s, prior to their systematic eradication. In 2010, we collaborated with local agencies and conservation organizations to restore the functional role of prairie dogs to the grassland system. Gunnison’s prairie dogs were reintroduced to a site that was occupied by prairie dogs 40 years ago.  This work is part of a larger, long-term study where we are studying the ecological effects of prairie dogs as they re-colonize the grassland ecosystem. With this project, we would like to further investigate the impact that Gunnison’s prairie dogs have on the landscape. Gunnison’s prairie dog monitoring data has been collected from the beginning of the reintroduction project, but little information has been collected on how grassland species respond to the sudden presence of prairie dogs on the refuge. This project will help determine if the prairie dog reintroduction has had positive impacts on the grassland ecosystem. Prairie dogs benefit grasslands in many ways, but their role as ecosystem engineers directly impacts other species by creating new habitat that would not be present without prairie dogs. We have documented physical landscape changes, but we have not specifically documented benefits to other grassland species. This work will help determine if the reintroduced prairie dog populations on Sevilleta NWR are now acting as a keystone species in a grassland ecosystem by monitor
Gunnison's Prairie Dog Relocation Project: Population Dynamics within Grasslands at the Sevilleta National Widlife Refuge, New Mexico (2005-2014)
The Sevilleta Gunnison’s Prairie Dog (Cynomys gunnisoni) Restoration project examines keystone consumer (herbivore) effects on grassland in concert with ecological restoration of a “species of greatest conservation need in New Mexico” (NMGandF Comprehensive Wildlife Conservation Strategy, 2007). SevLTER partners directly with Sevilleta National Wildlife Refuge, New Mexico Game and Fish, USFS Rocky Mountain Research Station and non-profit Prairie Dog Pals on this ambitious effort to re-establish Gunnison’s prairie dogs to blue grama dominated (Bouteloua gracilis) Great Plains grassland at the foothills of the Los Pinos Mountains on Sevilleta. While engaged in wildlife management aimed at translocation of approximately 3000 individual prairie dogs, ultimately establishing 5-6 colonies over a 500 ha area, SevLTER is focusing resources on monitoring population dynamics of reintroduced prairie dogs and their effects on vegetation production and diversity, soil disturbance and grasshopper community composition. In this experiment, prairie dogs act as the treatment on a grassland site where the species was extirpated 40 years ago. The long term nature of the project lies in the course of re-establishing prairie dogs combined with the ultimate research goal of describing the functional role of Gunnison’s prairie dogs in an arid grassland ecosystem: first we are challenged to develop and document an economical and efficient management strategy which maximizes reintroduction success and colony survival; second we are tasked with monitoring prairie dog dynamics and their effects on the grassland throughout re-establishment and into a future state, when presumably management intervention will have subsided and we characterize the ecosystem as ‘restored’ – both in the face of highly variable abiotic inputs such as precipitation and temperature and biotic impacts such as predation.
Reptile Populations at the Sevilleta National Wildlife Refuge, New Mexico (1989-1990)
Reptile populations were sampled in spring and summer in various habitats: grassland, creosote shrubland, pinyon-juniper woodland, cottonwood forest, subalpine forest, and subalpine meadow. On 18 sites mark-release methods were used; on 12 sites, all animals were kept for museum specimens. Museum specimen preparations included skulls, whole skeletons, and alcohol preservations; all specimens had tissue samples (liver, heart) taken for ultra-cold preservations for genetic analyses; some were karyotyped. All museum specimens were checked for internal parasites.
Population
<p>This data set contains a sample of population of hares, lynxes and carrots in a 20-year period.</p>
Population weighted CDD data of Turkey
<p>The Population Weighted Cooling Degree Days Data of Turkey</p> <p>Time Period: 1980-2018</p> <p>Data providers: NASA (2015) and TurkStat (2019) </p> <p> </p> <p>-NASA (National Aeronautics and Space Administration). 2015. NASA Earth Exchange Global Daily Downscaled Projections (NEX-GDDP). http://dx.doi.org/10.7292/W0MW2F2G.</p> <p>-TurkStat (Turkish Statistical Institute). 2019. Population of provinces by years report. Accessed August 11, 2019. http://www.tuik.gov.tr/PreIstatistikTablo.do?istab_id=1590.</p>
Population assessment and foraging ecology of the rare solitary bee Anthophora retusa at Seaford Head Nature reserve
<p><em>Anthophora retusa</em> is a rare solitary bee which has declined throughout Britain and other European countries since the 1990s. It is thought to be restricted to five sites in Britain. However, information on these remaining populations is limited. Knowledge on population size, dispersal distance, habitat and forage requirements are important for successful conservation of species. The population of <em>A. retusa</em> at the Seaford Head Nature reserve in East Sussex was surveyed. Using mark recapture the population was estimated in 2018 and 2019 to be fewer than 200 individuals, with the male population increasing from 47 in 2018 to 167 in 2019. The female population was 44 in 2018 but due to zero recaptures in 2019, no population estimate was possible. Bees seem to be geographically restricted to a 25ha area within the reserve. The most visited flower species by females was <em>Glechoma hederacea </em>(66% of visits) but flower preference changed throughout the flight season, shifting to Fabaceae species and <em>Iris foetidissima</em> with 16 plant groups identified in pollen samples. Although the exact location of nesting sites was not determined with certainty it’s thought they are nesting in the loess deposits at the top of the inaccessible sea cliff face. The average distance between recaptures was 122m, perhaps indicating low dispersal. This project suggests the presence of appropriate nesting sites, potentially soft exposed soil, may be limiting <em>A. retusa</em> distribution as they appear to forage on common plant species. More research is needed on the exact nesting requirements of the species.</p>
Supplementary data for Ün et. al. 2020 "Cytoplasmic incompatibility between New and Old World populations of a tramp ant"
<p>Supplementary annotation and phylogenetic data. See included README file for details.</p>
Data Set to 'Sodium-induced population shift drives activation of thrombin'
<p>The data set 10.5281/zenodo.3688506 contains the raw data used for the preparation of the manuscript 'Sodium-induced population shift drives activation of thrombin' (doi:10.1038/s41598-020-57822-0). To limit the required storage space, the trajectories are deposited only as coordinates of the analysed loop. The data set is separated into following parts:</p> <ul> <li>X-ray: Data used in the analysis of the PDB structures of thrombin, including a list of the PDB IDs, results of the PCA and values of the introduced features in the structures.</li> <li>cMD: Input parameters, topologies and starting coordinates of classical MD simulation based on different PDB structures (3bei, 3lu9 – with Na<sup>+</sup> ions and without Na<sup>+</sup> ions), resulting trajectories, projection on X-ray PCA and values of the introduced features during the simulations.</li> <li>TMD: Input parameters, topologies and starting coordinates of the targeted MD simulations, resulting trajectories, projection on X-ray PCA and RMSD values.</li> <li>Seeded-Simulations: Input parameters, topologies and starting coordinates of classical MD simulations that are started from cluster representatives of the TMD simulations and resulting trajectories (3*100 simulations, each lasting 200 ns), separated into simulations with Na+ and without Na+, additionally values of the introduced features during the simulations.</li> <li>MSM: For both systems (with and without Na<sup>+</sup>), files are provided that can be loaded with pyemma (TICA objects, kmeans clusterings, calculated implied timescales and MSMs); additionally TICs of the seeded simulations, psi-dihedrals of the seeded simulations, RMSD values of the E and E<sup>*</sup> states and representative structures of the E and E<sup>*</sup> states</li> </ul> <p>A more detailed description of the included files can be found in the README files in each folder.</p>
Data of "Investigating the potential for genetic improvement of nitrogen and phosphorus efficiency of in a Swiss Large White pigs population using chemical analysis"
<p>Data for article 'Investigating the Potential for Genetic Improvement of Nitrogen and Phosphorus Efficiency in a Swiss Large White Pig Population using Chemical Analysis' (DOI: 10.1111/JBG.12472). Dataset of 294 Swiss Large White pigs for which phenotypes of nitrogen efficiency, phosphorus efficiency (both determined by chemical analysis of N and P content of empty body and carcass as well as the feed ingested over the experiment phase), average daily gain and gain:feed ratio are available. We also provide the pedigree that was used to estimate genetic parameters in animal models and a description of the variables (metadata).</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.