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22 results for “drawdown”
Dataset: Cabana Target Drawdown 10 ETF (TDSC) Stock Performance
This dataset provides historical stock market performance data for specific companies. It enables users to analyze and understand the past trends and fluctuations in stock prices over time. This information can be utilized for various purposes such as investment analysis, financial research, and market trend forecasting.
Fig. 1 in Induced reproduction in a migratory teleost species by water level drawdown
Fig. 1. Photomicrographs of gonads of Astyanax altiparanae over the sampling times (stained with hematoxylin-eosin). (A) Ovary in spawning capable phase from -4h to 4h; (B) Ovary in the same phase but with post-ovulatory complexes presents in 8h and 12h; (C) Ovary in the advanced actively spawning subphase of the spawning capable phase at 16h; (D) Ovary during regressing phase from 20h to 28h; (E) Testis in spawning capable phase from -4h to 8h; (F) Testis in the advanced actively spawning subphase of the spawning capable phase at 12h; (G) Testis returning the primary spawning capable phase from 16h to 28h. In - initial oocytes; Pvt - pre-vitellogenic oocytes; Vt - vitellogenic oocytes; POC - post-ovulatory complexes; GVBD - mature oocytes (oocytes with germinal vesicle breakdown); Atr - atresias; Sc1 - primary spermatocyte; Sc2 - secondary spermatocyte; St - spermatids; Sz - spermatozoids.
Fig. 2 in Induced reproduction in a migratory teleost species by water level drawdown
Fig. 2. Quantitative analyses of the gonads. (A) Plot of female germ cells proportion though sampling times; (B) Variation in female gonadosomatic index (GSI) over the sampling times (H=16.388, p=0.037); (C) Plot of male germ cells proportion though sampling times; (D) Variation in male gonadosomatic index (GSI) over the sampling times (F=1.806, p=0.120).
Data from: Reduced productivity and carbon drawdown of tropical forests from ground-level ozone exposure
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Data from: Soil phosphorus drawdown by perennial bioenergy cropping systems in the Midwestern US
<p>Without fertilization, harvest of perennial bioenergy cropping systems diminishes soil nutrient stocks, yet the time course of nutrient drawdown has not often been investigated. We analyzed phosphorus (P) inputs (fertilization and atmospheric deposition) and outputs (harvest and leaching losses) over seven years in three representative biomass crops—switchgrass (<em>Panicum</em> <em>virgatum</em> L.), miscanthus (<em>Miscanthus</em> X <em>giganteus</em>) and hybrid poplar trees (<em>Populus</em> <em>nigra</em> X <em>P</em>. <em>maximowiczii</em>) – as well as in no-till corn (maize; <em>Zea</em> <em>mays</em> L.) for comparison, all planted on former cropland in SW Michigan, USA. Only corn received P fertilizer. Corn (grain and stover), switchgrass, and miscanthus were harvested annually, while poplar was harvested after six years. Soil test P (STP; Bray-1 method) was measured in the upper 25 cm of soil annually. Harvest P removal was calculated from tissue P concentration and harvest yield (or annual woody biomass accrual in poplar). Leaching was estimated as total dissolved P concentration in soil solutions sampled beneath the rooting depth (1.25 m), combined with hydrological modeling. Fertilization and harvest were by far the dominant P budget terms for corn, and harvest P removal dominated the P budgets in switchgrass, miscanthus, and poplar, while atmospheric deposition and leaching losses were comparatively insignificant. Because of significant P removal by harvest, the P balances of switchgrass, miscanthus, and poplar were negative and corresponded with decreasing STP, whereas P fertilization compensated for the harvest P removal in corn, resulting in a positive P balance. Results indicate that perennial crop harvest without P fertilization removed legacy P from soils, and continued harvest will soon draw P down to limiting levels, even in soils once heavily P-fertilized. Widespread cultivation of bioenergy crops may therefore alter P balances in agricultural landscapes, eventually requiring P fertilization, which could be supplied by P recovery from harvested biomass.</p>
Slow drawdown, fast recovery: Stream macroinvertebrate communities improve quickly after large dam decommissioning
<p>Dam removal is increasingly considered as a river restoration tool for impoundments that harm the environment or have exceeded their lifespan. However, few studies report the ecological consequences of large dam removal. We performed a multiple Before-After/Control-Impact (mBACI) study to investigate the consequences of the decommissioning of a large dam (42 m high) on instream habitat and invertebrate communities in a temperate, forested catchment of northern Spain. Before decommissioning, a lack of fine sediments and high concentrations of manganese and iron occurred below the dam but decreased downstream. Invertebrate taxa richness and diversity were reduced, and pollution-sensitive taxa were missing just below the dam. The drawdown of the reservoir, the first step towards its decommissioning, mobilized stored sediments causing frequent turbidity peaks downstream, which nevertheless, caused no detrimental effects on macroinvertebrate communities. One year after the drawdown, the communities downstream from the dam, as well as those in the newly formed stream in the area formerly impounded by the reservoir, became very similar to those in control reaches, showing a successful restoration project.</p> <p><em>Synthesis and applications: </em>Dam decommissioning helps restore instream habitats and facilitates the recovery of invertebrate communities in a very short time frame if there are nearby sources of potential colonizers. Slow drawdown reduces the transport of the sediments accumulated in the reservoir and their potential downstream impacts, even more if before drawdown the reservoir is kept full for years to promote the retention of sediments in marginal areas that will later be readily colonized by trees.</p>
Data from: Functional traits underlying performance variations in the overwintering of the cosmopolitan invasive plant water hyacinth (Eichhornia crassipes) under climate warming and water drawdown
<p><span>Reports of the Intergovernmental Panel on Climate Change (IPCC) indicate that temperature rise is still the general trend of the global climate in the 21st century. Invasive species may benefit from the increase in temperature, as climate can be viewed as a resource, and the increase in the available resources favors the invasibility of invasive species. This study aimed to assess the overwintering growth of the cosmopolitan invasive plant water hyacinth (<em>Eichhornia crassipes</em>) at its northern boundary. Using <em>E. crassipes</em> as a model plant, a cross-year mesocosm experiment was conducted to determine 17 plant functional traits, including growth, morphological, root topological, photosynthetic and stoichiometric traits, under climate warming (ambient, temperature rises of 1.5°C and 3.0°C) and water drawdown or water withdrawal (water depths of 1 cm, 10 cm and 20 cm) treatments. The overwintering growth of <em>E. crassipes</em> was facilitated by climate warming and proper water drawdown, and climate warming played a leading role. A temperature rises of 3.0°C and a water depth of 10 cm were the most suitable conditions for the overwintering and rooting behavior of the plant. Controlling the temperature to within 1.5°C, an ambitious goal for China, still facilitated the overwintering of <em>E. crassipes</em>. With climate warming, the plant can overwinter successfully, which possibly assists it in producing and spreading new ramets in the vernal flood season. The new rooting behavior induced by ambient low temperature may be viewed as a unique growth adaptation strategy for a niche change, as it helps these plants invade empty niches left by dead free-floating plants on the water surface following winter freezes. With continued global warming, the distribution of the plant may expand northward, and eradication of the plant during the winter water drawdown period may be a more effective strategy.</span></p>
PLAINE ship wave drawdowns from XBeach model
<p>Processed model output with runup and drawdown from running different ship types. The first set of files are for Lac St-Pierre.</p> <ul> <li>294m x 32.2m container ship (Runup_drawdown_parametric_MtlExpress)</li> <li>229m x 32m tanker (Runup_drawdown_parametric_Tanker.nc)</li> <li>187m x 32.2m bulk carrier (Runup_drawdown_parametric_BulkCarrier.nc)</li> </ul> <p>Eventually, additional files will be uploaded for the other sites as they become available. </p>
Data from: Water level drawdown induces a legacy effect on the seed bank and retains sediment chemistry in a eutrophic clay wetland
<p>The lack of extreme water level fluctuations in managed, non-peat forming wetland ecosystems can result in decreased productivity through the loss of heterogeneity of these ecosystems. Stochastic disruption, such as a water level drawdown, can effectively reverse this effect and return the wetland to a more productive state, associated with higher biodiversity through new vegetation development. Yet, aside from the effect on vegetation dynamics, little is known about longer-term effects (30 years) of a water level drawdown, hereafter referred to as legacy effects, and how this may impact future water level drawdowns.</p> <p>Here, we aim to unravel the legacy effects of a water level drawdown, stand alone and along a water level gradient, on seed bank properties and nutrient availability in a eutrophic clay wetland. To identify these, we studied the hydrologically managed nature reserve Oostvaardersplassen in the Netherlands. Here, one section was subjected to a multi-year water level drawdown and another section was kept inundated. We determined seed bank properties in both areas, spatially and along a soil elevation gradient (20 cm). Nutrient availability was measured by taking sediment samples along the water level gradient and through experimental manipulation of the water level in an indoor mesocosm experiment.</p> <p>Germination was higher in locations with a water level drawdown history, especially at relatively high elevations. Additionally, the proportion of pioneer species in the seed bank was higher in the water level drawdown area. Overall, nutrient concentrations were higher compared to other systems. Nutrient availability was higher in the inundated area and did not respond to the water level gradient. We conclude that 30 years after an induced water level drawdown there is no depletion of nutrients, while we still observe a legacy effect in the number of viable seeds in the seed bank.</p>
Data from: Functional traits underlying performance variations in the overwintering of the cosmopolitan invasive plant water hyacinth (Eichhornia crassipes) under climate warming and water drawdown
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Water level drawdown and perennial vegetation impact litter decomposition in the sediment of a eutrophic wetland in the Netherlands
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Data from: Soil phosphorus drawdown by perennial bioenergy cropping systems in the Midwestern US
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Data for: Water level drawdown makes boreal peatland vegetation more responsive to weather conditions
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Data from: Multi-year water level drawdown and wildlife grazing drive wetland vegetation succession
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Slow drawdown, fast recovery: Stream macroinvertebrate communities improve quickly after large dam decommissioning
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Data from: Water level drawdown induces a legacy effect on the seed bank and retains sediment chemistry in a eutrophic clay wetland
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Supplementary materials to "Brakenhoff et al., Application of time series analysis to estimate drawdown from multiple well fields."
<p>This repository contains the supplementary material that allow to reproduce all the results from the study submitted to Frontiers journal.</p> <p> </p>
Model data for: Drawdown of atmospheric pCO2 via dynamic particle export stoichiometry in the ocean twilight zone
<p>Understanding the global carbon cycle is key to understanding the climate system. One of the large unknowns is the processes happening in the twilight zone of the ocean. Here, we focus on how elemental stoichiometry of particulate organic matter in the twilight zone affects the strength of the biological pump and atmospheric CO2. We show through modeling that atmospheric CO2 is very sensitive to the change in C:P ratio in the twilight zone. Numerous model studies study the link between the carbon cycle and flexible elemental stoichiometry of organic matter in the surface ocean. However, our model study is unique. It investigates the effects of stoichiometric changes both at the surface and in the subsurface ocean that also involve stoichiometric interaction between phytoplankton and zooplankton.<br> <br> We use a 3D numerical model to illustrate how C:P variability in the twilight zone can significantly modulate the strength of carbon sequestration and atmospheric CO2. We used the biogeochemical model MOPS (Kriest and Oschlies, Geosci. Model Dev., 8, 2929–2957, 2015) coupled to ECCO Transport Matrices.</p> <p>This repository contains model input and output files for each sensitivity run outlined in the paper. The run ID corresponds to different sensitivity run. See README for more details. </p>
Data from: Waterbird response to variable-timing of drawdown in rice fields after winter-flooding
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Model data for: Drawdown of atmospheric pCO2 via dynamic particle export stoichiometry in the ocean twilight zone
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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
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