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2,281 results for “laboratories”
Water Level, Water Temperature, and Flow Measurements from the Ball Creek weir house #9, Coweeta Hydrologic Laboratory, Otto, NC.
This data set contains water level, water temperature, and calculated discharge values from the Ball Creek weir house #9, Coweeta Hydrologic Laboratory, Otto, NC. Using a pressure transducer, measurements are taken every 60 seconds with the average, minimum, and maximum values for water pressure and water temperature saved to the output data table hourly. Water level and discharge are calculated using the hourly average water pressure, and saved to the online data files.
Ecology and Evolutionary Biology Field Trip at the Coweeta Hydrologic Laboratory (Watershed 18) in 2004: Aquatic Invertebrates (Adult) data
As part of an educational project, we intend to conduct a short "bioblitz" that will focus on 4 major groups of organisms: (1) vertebrates, especially birds and salamanders; (2) the local flora, especially fungi, trees, and any herbaceous species present this early; (3) aquatic invertebrates; (4) terrestrial invertebrates. Data will be compared to available lists of taxa from Coweeta and Great Smoky Mountains National Park.
Nutrient effects on a detritus-based stream ecosystem at the Coweeta Hydrologic Laboratory from 1998 to 2003
To determine the effects of nutrient enrichment in a detritus-based stream, we have continuously enriched a headwater stream with N and P for 4.5 years and quantified the response at different scales of stream structure and function: microbial, metazoan, and ecosystem. The effects of enrichment in the treatment stream (Watershed 54, WS54) were compared to conditions in the reference stream (Watershed 53, WS53) and one year of comprehensive baseline sampling was conducted in both streams prior to enrichment. Our first objective was to assess the effects of nutrient enrichment on growth and production of organisms. Our second objective was to determine the effects of nutrients on the fate of carbon resources, which were altered via increased microbial metabolism and invertebrate consumption.
Changes in water temperature in streams with progressive hemlock mortality at 8 Coweeta Hydrologic Laboratory study sites from 2004 to 2013
The purpose of this study was to document changes in water temperature in 8 streams in areas affected by hemlock mortaity. Beginning in August 2004, one temperature logger was submerged at the downstream end of each of 8 small stream sites. Temperature was recorded a minimum of every 4 h. This study was conducted at Coweeta Hydrologic Laboratory, Otto, North Carolina. Stream sites were located on 1st and 2nd order streams reaches affected by hemlock death. Six sites were located in areas that have not been logged since the area became National Forest in the late 1920s and where streams passed through or were adjacent to permanent vegetation plots in which trees were measured in 1934-35, 1969-73 and 1988-93 (Elliott and Swank, 2008). Also included are data from two sites on WS 7 (Big Hurricane Branch), which was logged in 1977.
Salamander survival and growth cage experiment at the Coweeta Hydrologic Laboratory, Otto, NC
Climate change is predicted to alter biotic communities and, as a result, cause changes in ecosystem processes. Such predictions assume that future communities will lack species capable of compensating for the loss of other species. In southern Appalachian headwater streams, abundant larval Black-bellied Salamanders (Desmognathus quadramaculatus) represent a significant standing crop of nitrogen (N) and phosphorus (P). Desmognathus quadramaculatus are projected to be extirpated from the southern Appalachian highlands under most climate change scenarios, which would result in the loss of most salamander standing crop of limiting nutrients unless other species compensate for the loss of D. quadramaculatus biomass. Eurycea cirrigera, which has an abundant congener Eurycea wilderae already in the headwaters, and Gyrinophilus porphyriticus, which currently occurs in low densities in the headwaters, are projected to remain within southern Appalachian highlands. We used field cages to measure (1) the amount of compensatory survival and growth Eurycea would show in the absence of the larger, predatory D. quadramaculatus, and (2) whether replacement of D. quadramaculatus by G. porphyriticus, which is known to be a more efficient predator, would reduce Eurycea and total salamander biomass.
Desmognathus quadramaculatus excretion rate study at the Coweeta Hydrologic Laboratory, Otto, NC.
We examined the excretion rate of 18 Desmognathus quadramaculatus collected from W34 at Coweeta. Salamanders were collected and immediately placed in filtered stream water. They remained in the water for 24 hrs. Following excretion trials, animals were sacrificed, remaining water was filtered, and each was analyzed for levels of nitrogen and phosphorus.
Concentration of calcium in stream-dwelling Plethodontid salamanders across six streams located with the Coweeta Hydrologic Laboratory, Otto, NC
We examined the concentration of calcium in several species of stream-dwelling plethodontid salamanders captured across six streams located within the Coweeta LTER site. %Ca was measured for 15 Eurycea wilderae, 15 Desmognathus ocoee, and 20 Desmognathus quadramaculatus. Because D. quadramaculatus larvae represent animals across a 3-4 year larval lifespan, for %Ca analysis we randomly sampled 6-8 D. quadramaculatus from each of three size classes: 18-25 mm SVL, 26-33 mm SVL, and 33-40 mm SVL.
Plethodon hybrid zone capture-mark-recapture survey plots at the Coweeta Hyrdologic Laboratory, Otto, NC.
A major goal of the Coweeta LTER is to understand the interactions between climate and land use on the ecology of southern Appalachia biota. Southern Appalachia is the global hotspot for salamander diversity, with most of that diversity situated at mid and upper elevations of mountains where species are functionally trapped by their dependence of a narrow, cool climatic zone. The ranges of the two terrestrial salamander species, Plethodon teyahalee (southern Appalachian salamander) and Plethodon shermani (red-legged salamander) meet at a unique hybrid zone at the Coweeta LTER in Macon County, NC. The hybrid zone is unique because it appears to be shifting up in elevation, possibly due to climate change. This research will be situated in the hybrid zone of these two species to assess the differential effects of climate change and land use on both species. To evaluate the effects of climate on the local ecology of salamanders, we will conduct an intensive mark-recapture study to measure surface activity on 6 plots distributed in pairs at 3 elevations that provide a range of warmer to cooler climates. Every two weeks, each plot is searched for 30 min by two investigators using head lamps. Animals are hand captured, identified to species, scored for color and patterning, measured, and marked using a unique combination of visible implant elastomers (VIE). This will enable us to estimate individual capture probabilities and rates of temporary surface emigration (an indication of avoidance of climatically unsuitable conditions).
Riparian disturbance restricts connectivity of Appalachian stream salamander populations at the Coweeta Hydrologic Laboratory
Human populations are rapidly expanding and encroaching on previously undisturbed habitats. Stream salamanders in the southern Appalachian Mountains are a diverse and abundant group threatened by rapid exurban development in high-elevation watersheds. Previous research has demonstrated the sensitivity of salamanders to urbanization, but little research exists describing the mechanisms behind population declines and extirpations. Appalachian stream salamanders are adapted to forested streams with dense overstory and little light, yet following urbanization, light gaps associated with land clearing emerge. Light avoidance behaviors may alter movement behaviors of salamanders, fragmenting populations on opposite sides of light gaps. To study the effects on riparian disturbance on salamanders we established 6 experimental sites with canopy gaps ranging from 13m to 85m in stream length and 2 control sites lacking canopy gaps in May of 2010. Animals were collected within these plots, marked, and translocated to the plot on the opposite side of the gap. To establish detection probabilities in the absence of translocation, we established an additional 10m plot in the forest at each site where individuals were captured, marked, and re-released within this area. Recaptured individuals were measured and in some cases re-marked if those individuals had returned to their capture location.
Joyce Kilmer Memorial Forest - microclimate station - midslope plot at the Coweeta Hydrologic Laboratory from 1996 to 2008
Tree stem temperature is currently being collected to determine both diurnal and seasonal variation in tree stem temperatures for all species and sizes present at the Joyce Kilmer Memorial Forest mid-slope plot. The purpose of the data is to characterize the tree stem temperature regimes as they relate to tree stem respiration. Data will continue to be collected indefinitely. Data will be subsequently summarized and published. This study supports project 4006: Southern Appalachian tree stem respiration. Resources for students about terms used in this study: Joyce Kilmer Memorial Forest - Source: University of North Carolina-Asheville, National Forests Forest Carbon Cycling - Source: Coweeta Schoolyard LTER
Stem temperature at watershed 18, cove 218 gradient plot at the Coweeta Hydrologic Laboratory from 1996 to 1999
Tree stem temperature is currently being collected to determine both diurnal and seasonal variation in tree stem temperatures for all species and sizes present at the Coweeta Watershed 18 Cove 218 Gradient Plot. The purpose of the data is to characterize the tree stem temperature regimes as they relate to tree stem respiration. Data will continue to be collected until approximately December 1997. Data will then be subsequently summarized and published.
Aboveground biomass and nitrogen allocation of ten deciduous southern Appalachian tree species at the Coweeta Hydrologic Laboratory in 1997
Allometric equations were developed for mature trees of 10 deciduous species at the Coweeta Hydrologic Laboratory in western North Carolina, U.S.A. These equations included the following dependent variables: stem wood mass, stem bark mass, branch mass, total wood mass, foliage mass, total biomass, foliage area, stem surface area, sapwood volume, and total tree volume. High correlation coefficients (R2) were observed for all variables versus stem diameter, with the highest being for total tree biomass, which ranged from 0.981 for Oxdendrum arboreum to 0.999 for Quercus coccinea. Foliage area had the lowest R2 values, ranging from 0.555 for Quercus alba to 0.962 for Betula lenta. When all species were combined, correlation coefficients ranged from 0.822 for foliage area to 0.986 for total wood mass, total tree biomass, and total tree volume. Species with ring versus diffuse/semiring porous wood anatomy exhibited higher leaf area with a given cross-sectional sapwood area as well as lower total sapwood volume. Liriodendron tulipifera contained one of the highest foliar nitrogen concentrations and had consistently low branch, bark, sapwood, and heartwood nitrogen contents. For a tree diameter of 50 cm, Carya spp. exhibited the highest total nitrogen content whereas Liriodendron tulipifera exhibited the lowest.
Climate Change Across Seasons Experiment (CCASE) at the Hubbard Brook Experimental Forest: growth and enzyme activity traits of soil fungi isolated from CCASE in July 2017, grown under a common garden experiment in the laboratory that mimicked CCASE soil temperature treatments
Projections for the northeastern U.S. indicate that mean air temperatures will rise and snowfall will become less frequent, causing more frequent soil freezing. To test fungal responses to these combined chronic and extreme soil temperature changes, we conducted a laboratory-based common garden experiment with soil fungi that had been subjected to different combinations of growing season soil warming, winter soil freeze/thaw cycles, and ambient conditions for four years in the field. We found that fungi originating from field plots experiencing a combination of growing season warming and winter freeze/thaw cycles had inherently lower activity of acid phosphatase, but higher cellulase activity, that could not be reversed in the lab. In addition, fungi quickly adjusted their physiology to freeze/thaw cycles in the laboratory, reducing growth rate and potentially reducing their carbon use efficiency. Our findings suggest that less than four years of new soil temperature conditions in the field can lead to physiological shifts by some soil fungi, as well as irreversible loss or acquisition of extracellular enzyme activity traits by other fungi. These findings could explain field observations of shifting soil carbon and nutrient cycling under simulated climate change. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Laboratory reflectance spectra and pigments from giant kelp blades
This dataset contains the whole blade reflectance and photosynthetic pigment concentrations from 1700 recently matured blades of giant kelp (Macrocystis pyrifera). The blades were collected at five sites along the California coast from 2012 to 2015.
Individual datasets investigating combined toxicity of binary mixtures in bees from laboratory tests
<p>This excel file (DOI: https://doi.org/10.5281/zenodo.3383713) provides the individual datasets on binary mixture toxicity (mortality) in bees classified according to route and exposure patterns (i.e. oral, contact, acute and chronic) and mortality endpoints (e.g.LD<sub>50</sub>, LC<sub>50</sub>) for the honeybee (<em>Apis mellifera</em>) and wild bee species (<em>Osmia bicornis</em>, <em>Bombus terrestris</em>). 218 individual binary mixtures were collected and included in the statistical analyses with the majority of toxicological endpoints reported as lethal doses or concentrations (e.g. LD<sub>50</sub>, LC<sub>50</sub>,) for pesticides or pesticides and veterinary drugs combinations with 133, 44 and 41 mixtures reporting acute contact toxicity (i.e. topical application), chronic oral toxicity and acute oral toxicity, respectively. Combined toxicity data for binary mixtures were available as dose response data in honeybees for acute contact toxicity (n=92) and acute oral toxicity.</p> <p>The full data collection and analysis of binary mixtures are described in Carnesecchi et al., 2019 (DOI: 10.1016/j.envint.2019.105256)</p>
Dataset related to the article "Laboratory-scale hydraulic fracturing dataset for benchmarking of Enhanced Geothermal System simulation tools"
<p>Experimental results from hydraulic fracturing experiments performed in granite and marble samples of size 30 cm × 30 cm × 45 cm under well-defined boundary conditions.</p> <p>Datasets include:</p> <ul> <li>pressure versus flow-rate response</li> <li>acoustic emission data from a dense network of 32 seismic sensors</li> <li>detailed description of the experimental set-up and adopted test protocol</li> <li>mechanical and petrophysical properties of the samples</li> <li>python code for seismic data processing</li> </ul> <p>This complete collection of data, obtained within the framework of European Union’s Horizon 2020 project GEMex, is rare in its kind and indispensable for verification of model assumptions and constitutive relationships of numerical codes used for designing field-scale hydraulic fracturing experiments.</p>
National Severe Storms Laboratory Mobile Soundings during Lapse-Rate (CLAMPS trailer)
<p>This dataset includes files from the National Severe Storms Laboraory mobile sounding units operated during the LAPSE-RATE field campaign. The files contained here are for each individual sounding launched from the CLAMPS trailer owned and operated by the University of Oklahoma, along with a readme file explaining the data format and processing.</p>
National Severe Storms Laboratory Mobile Mesonet data files from Lapse-Rate
<p>This dataset includes files from the National Severe Storms Laboratory mobile mesonets operated during the LAPSE-RATE field campaign. Daily files from each operation day are uploaded, along with a readme file explaining the format and processing.</p> <p>Version 2 Notes: The original version of this upload contained files with incorrect QC flags. While the core data is correct, the QC flags can be useful for determining specific areas of interest or problems. After identifying this issue, the files were reprocessed to include the correct QC flags and were uploaded to the archive as Version 2. Any questions should be directed to sean.waugh@noaa.gov.</p>
Data Set - Laboratory measurement of the wave–induced plastic particles motion: The influence of wave period, plastic size and plastic density
<p><strong>Data set - Laboratory measurement of the wave–induced plastic particles motion: The influence of wave period, plastic size and plastic density</strong></p> <p>This data set describes the wave flume experimental data on the wave-induced plastic particles motion induced by different wave conditions and different plastic particles density and size. A manuscript is currently under review describing the analysis of the data.</p> <p>The data set is divided in two parts:</p> <p>- <strong>Wave flume hydrodynamics</strong>. With measured water surface elevation at different locations within the wave flume. These data are stored in txt files with headings describing the type of measurement, i.e. wave paddle motion, water surface elevation at different sensors, synchronization signal for the video-cameras.</p> <p>- <strong>Lagrangian trajectories. </strong>hdf5 files with information of the particles position, velocity and time (with respect to the synchronization signal in the respective hydrodynamic file) for each experiment. Two tar.gx files have been uploaded with trajectories information:</p> <p> - TOPIOS_Trajectories_FloatingParticles.tar.xz, with information of floating plastic particles and,</p> <p> - TOPIOS_Trajectories_NonfloatingParticles.tar.xz, with information of non-floating plastc particles.</p> <p>An excel file with information of filenames, cross-shore locations of sensors, plastic particles and wave conditions is also uploaded (TOPIOS_Control_exp.xlsx).</p> <p>Any question regarding the data can be addressed at jose.alsina@upc.edu</p>
Figure 2 in Economically Beneficial Ground Beetles. The specialized predators Pheropsophus aequinoctialis (L.) and Stenaptinus jessoensis (Morawitz): Their laboratory behavior and descriptions of immature stages (Coleoptera: Carabidae: Brachininae)
Figure 2. Frequency of numbers of eggs laid daily by S. jessoensis females in February 1987 (Σ observations = 145 excluding records of zero).
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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.