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100 results for “Altitude effect”
Dataset: Effects of high altitude reservoirs on the structure and function of lotic ecosystems: a case study in Italy
<p>Supporting data for "Effects of high altitude reservoirs on the structure and function of lotic ecosystems: a case study in Italy"</p> <p>Macroinvertebrate community composition</p> <p>Water chemical characteristics</p> <p>Daily mean water temperature and daily temperature variations</p> <p>Results of the leaf bags experiments</p>
Data from: Effect of altitude on volatile organic and phenolic compounds of artemisia brevifolia wall ex Dc. from the Western Himalayas
<p>Adaptation to changing environmental conditions is a driver of plant diversification. Elevational gradients offer a unique opportunity for investigating adaptation to a range of climatic conditions. The use of specialized metabolites as volatile and phenolic compounds is a major adaptation in plants, affecting their reproductive success and survival by attracting pollinators and protecting themselves from herbivores and other stressors. The wormseed <em>Artemisia brevifolia</em> can be found across multiple elevations in the Western Himalayas, a region that is considered a biodiversity hotspot and is highly impacted by climate change. This study aims at understanding the volatile and phenolic compounds produced by <em>A. brevifolia </em>in the high elevation cold deserts of the Western Himalayas with the view to understanding the survival strategies employed by plants under harsh conditions. Across four sampling sites with different elevations, polydimethylsiloxane (PDMS) sampling and subsequent GCMS analyses showed that the total number of volatile compounds in the plant headspace increased with elevation and that this trend was largely driven by an increase in compounds with low volatility, which might improve the plant's resilience to abiotic stress. HPLC analyses showed no effect of elevation on the total number of phenolic compounds detected in both young and mature leaves. However, the concentration of the majority of phenolic compounds decreased with elevation. As the production of phenolic defense compounds is a costly trait, plants at higher elevations might face a trade-off between energy expenditure and protecting themselves from herbivores. This study can therefore help us understand how plants adjust secondary metabolite production to cope with harsh environments and reveal the climate adaptability of such species in highly threatened regions of our planet such as the Himalayas.</p>
Data from: Effect of altitude on volatile organic and phenolic compounds of artemisia brevifolia wall ex Dc. from the Western Himalayas
Open the record for dataset details and reuse information.
Efficacy Study of Riociguat and Its Effects on Exercise Performance and Pulmonary Artery Pressure at High Altitude
ClinicalTrials.gov study NCT02024386. IPD Sharing: Not stated. Countries: 1. Publications: 31.
Effects of Nebivolol Versus Carvedilol on Cardiopulmonary Function at High Altitude in Healthy Subjects.
ClinicalTrials.gov study NCT00924833. IPD Sharing: Not stated. Countries: 1. Publications: 8.
The Psychophysiological Effect of Simulated and Terrestrial Altitude
ClinicalTrials.gov study NCT04075565. IPD Sharing: NO. Countries: 1. Publications: 0.
Data from: Effects of UVB radiation on grazing of two cladocerans from high-altitude Andean lakes
Climate change and water extraction may result in increased exposition of the biota to ultraviolet-B radiation (UVB) in high-altitude Andean lakes. Although exposition to lethal doses in these lakes is unlikely, sub-lethal UVB doses may have strong impacts in key compartments such as zooplankton. Here, we aimed at determining the effect of sub-lethal UVB doses on filtration rates of two cladoceran species (Daphnia pulicaria and Ceriodaphnia dubia). We firstly estimated the Incipient Limiting Concentration (ILC) and the Gut Passage Time (GPT) for both species. Thereafter we exposed clones of each species to four increasing UVB doses (treatments): i) DUV-0 (Control), ii) DUV-1 (0.02 MJ m2), iii) DUV-2 (0.03 MJ m2) and iv) DUV-3 (0.15 MJ m2); and estimated their filtration rates using fluorescent micro-spheres. Our results suggest that increasing sub-lethal doses of UVB radiation may strongly disturb the structure and functioning of high-altitude Andean lakes. Filtration rates of D. pulicaria were not affected by the lowest dose applied (DUV-1), but decreased by 50% in treatments DUV-2 and DUV-3. Filtration rates for C. dubia were reduced by more than 80% in treatments DUV-1 and DUV-2 and 100 % of mortality occurred at the highest UVB dose applied (DUV-3).
Data from: Altitude effects on spatial components of vascular plant diversity in a subarctic mountain tundra
Environmental gradients are caused by gradual changes in abiotic factors, which affect species abundances and distributions, and are important for the spatial distribution of biodiversity. One prominent environmental gradient is the altitude gradient. Understanding ecological processes associated with altitude gradients may help us to understand the possible effects climate change could have on species communities. We quantified vegetation cover, species richness, species evenness, beta diversity, and spatial patterns of community structure of vascular plants along altitude gradients in a subarctic mountain tundra in northern Sweden. Vascular plant cover and plant species richness showed unimodal relationships with altitude. However, species evenness did not change with altitude, suggesting that no individual species became dominant when species richness declined. Beta diversity also showed a unimodal relationship with altitude, but only for an intermediate spatial scale of 1 km. A lack of relationships with altitude for either patch or landscape scales suggests that any altitude effects on plant spatial heterogeneity occurred on scales larger than individual patches but were not effective across the whole landscape. We observed both nested and modular patterns of community structures, but only the modular patterns corresponded with altitude. Our observations point to biotic regulations of plant communities at high altitudes, but we found both scale dependencies and inconsistent magnitude of the effects of altitude on different diversity components. We urge for further studies evaluating how different factors influence plant communities in high altitude and high latitude environments, as well as studies identifying scale and context dependencies in any such influences.
Analysis of the effectiveness and safety of conventional anticoagulants in preventing deep vein thrombosis after total knee arthroplasty in patients undergoing total knee arthroplasty at high altitudes
<p><strong><span>Analysis of the effectiveness and safety of conventional anticoagulants in preventing deep vein thrombosis after total knee arthroplasty in patients undergoing total knee arthroplasty at high altitudes</span></strong></p>
Figure 4 in The effect of altitude on arid inselbergs along a bioclimatic gradient
Figure 4. Mean and standard deviation of percent of local species pool for plains and per inselberg habitats for four inselberg landscapes (Ete-Bar: n = 9; Spk: n = 8; NR: n = 3; Sperr: n = 4).
Figure 3 in The effect of altitude on arid inselbergs along a bioclimatic gradient
Figure 3. Mean and standard deviation of Bray–Curtis similarity indices between plains and inselbergs per inselberg landscape (Ete-Bar: n = 9; Spk: n = 8; NR: n = 3; Sperr: n = 4).
Figure 1 in The effect of altitude on arid inselbergs along a bioclimatic gradient
Figure 1. Position of inselberg landscapes in the Namib Desert included in this study (dark grey shading, Succulent Karoo; medium shading, Namib Desert; light shading, Nama Karoo Biome).
Figure 2 in The effect of altitude on arid inselbergs along a bioclimatic gradient
Figure 2. Bray–Curtis similarity indices between inselbergs and surrounding matrix along altitude gradients for four inselberg landscapes (ETE-BAR, Etendeka-Barab; SPK, Spitzkoppe; NR, Namibrand; Sperr, Sperrgebiet).
Data used in "Investigating effects of solar proton events and Forbush decreases on ground-level potential gradient recorded at middle and low latitudes and different altitudes"
<p>Potential gradient deviations at CASLEO and SWIDER stations used in the paper "Investigating effects of solar proton events and Forbush decreases on ground-level potential gradient recorded at middle and low latitudes and different altitudes"</p> <p>Additionally is provided CARPET data.</p>
Effect of Acetazolamide on Right Ventricular Function at Rest in Patients With Respiratory Disease at Altitude
ClinicalTrials.gov study NCT03173508. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
The Effect of Acute High Altitude Exposure on Rescuer Performance and Patient Care
ClinicalTrials.gov study NCT06446427. IPD Sharing: NO. Countries: 1. Publications: 36.
Effect of Oxygen Therapy for Patients With Precapillary Pulmonary Hypertension Who Experience an Altitude Related Adverse Health Effect (ARAHE) During 30h Exposure to 2500m
ClinicalTrials.gov study NCT05112172. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Effect of Acetazolamide on Right Heart Function at Rest in Lowlanders Older Than 40 Years at Altitude.
ClinicalTrials.gov study NCT03540914. IPD Sharing: Not stated. Countries: 1. Publications: 1.
The Effect of Altitude Difference on the Duration of Nerve Block; A Three-Center Study.
ClinicalTrials.gov study NCT06027918. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
Effect of Acetazolamide on Postural Control in Lowlanders Older Than 40 Years at Altitude
ClinicalTrials.gov study NCT03536429. IPD Sharing: Not stated. Countries: 1. Publications: 1.
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OpenNeuro
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