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831 results for “Partition”
Resources for publication "Meteorologically normalised long-term trends of atmospheric ammonia (NH3) in Switzerland/Liechtenstein and the explanatory role of gas-aerosol partitioning"
<p>Resources for publication "Meteorologically normalised long-term trends of atmospheric ammonia (NH3) in Switzerland/Liechtenstein and the explanatory role of gas-aerosol partitioning".</p>
Dataset: Variation in leaf reflectance spectra across the California flora partitioned by evolutionary history, geographic origin, and deep time
<p>We collected leaf reflectance data from plants in a common garden where plants from across California are grown. We focused on 10 regions of the California Floristic Province represented at the Regional Parks Botanic Garden (RPBG). During the summer of 2020 and the early-fall of 2021, we visited RPBG with a back-pack spectroradiometer (ASD Fieldspec 4 and Fieldspec Pro) with an attached leaf clip and plant probe with its own light source (part number A122327). From each accessible plant we collected leaf-level reflectance spectra (380 to 2500 nm, 3 nm in the VNIR, 10 nm in the SWIR) from ~3 representative leaves). This dataset includes 631 region-by-species mean leaf-level reflectance spectra, both in raw reflectance as well as subjected to Continuum Removal. </p>
Can diet niche partitioning enhance sexual dimorphism?
<ol> <li class="MsoNormal"> <span>Classic evolutionary theory suggests that sexual dimorphism evolves primarily via sexual and fecundity selection. However, theory and evidence is beginning to accumulate suggesting that resource competition can drive the evolution of sexual dimorphism, </span>via<span> ecological character displacement between sexes. A key prediction of </span>this<span> hypothesis is that the extent of ecological divergence between sexes will be associated with the extent of sexual dimorphism. </span> </li> <li class="MsoNormal"> <span>As the stable isotope ratios of animal tissues provide a quantitative measure of various aspects of ecology, we carried out a meta-analysis examining associations between the extent of isotopic divergence between sexes and the extent of body size dimorphism. </span>Our <span>models demonstrat</span>e<span> that large amounts of between-study variation in isotopic (ecological) divergence between sexes is non-random and may be associated with the traits of study subjects. We therefore completed meta-regressions to examine whether the extent of isotopic divergence between sexes is associated with the extent of sexual size dimorphism. </span> </li> <li class="MsoNormal"><span>We found modest but significantly positive associations across species between size dimorphism and ecological differences between sexes, that increased in strength when the ecological opportunity for dietary divergence between sexes was greatest.</span></li> <li class="MsoNormal"><span>Our results therefore provide further evidence that ecologically mediated selection, not directly related to reproduction, can contribute to the evolution of sexual dimorphism.</span></li> </ol>
Validation of an Idealized Aorta Model Analysed through Fluid-Structure Interaction Simulation with Robin-Neumann Partitioned Approach
<p>The aorta is multiphysics system where hemodynamics and wall structural mechanic are mutually influenced. A fluid-structure interaction approach is appropriate to describe the mechanical alterations suffered by the aortic wall in response to altered hemodynamic patterns. This work demonstrates the validation of the simulated idealized aorta model with a fluid-structure interaction (FSI) model through modified PIMPLE solver to use Robin-Neumann partitioned approach for the strongly-coupled algorithm using solids4foam v2. The validation involves the comparison of streamlines, pressure, and displacements with in vivo measurements. The geometry is reconstructed from the healthy aorta presented in 10.5281/zenodo.5801938. Our analysis shows that the streamlines and pressure pattern are comparable with the literature data acquired using rich medical imaging data. The maximum diameter deformation at the level of abdominal aorta is comparable with measured data and the diameter deformation profile along the cardiac cycle correctly follow the velocity profile. According to this results, our work shows a high-performance simulation suitable for several future works.</p>
Data from: Partitioning variance in population growth for models with environmental and demographic stochasticity
<ol> <li>How demographic factors lead to variation or change in growth rates can be investigated using life table response experiments (LTRE) based on structured population models. Traditionally, LTREs focused on decomposing the asymptotic growth rate, but more recently decompositions of annual 'realized' growth rates have gained in popularity.</li> <li>Realized LTREs have been used particularly to understand how variation in vital rates translates into variation in growth for populations under long-term study. For these, complete population models may be constructed by combining data in an integrated population model (IPM). IPMs are also used to investigate how temporal variation in environmental drivers affect vital rates. Such investigations have usually come down to estimating covariate coefficients for the effects of environmental variables on vital rates, but formal ways of assessing how they lead to variation in growth rates have been lacking. </li> <li>We extend realized LTREs in two ways. First, we further partition the contributions from vital rates into contributions from temporally varying factors that affect them. The decomposition allows us to compare the resultant effect on the growth rate of different environmental factors that may each act via multiple vital rates. Second, we show how realized growth rates can be decomposed into separate components from environmental and demographic stochasticity. The latter is typically omitted in LTRE analyses.</li> <li>We illustrate how to use the approach in an IPM for data from a 26-year study on northern wheatears (Oenanthe oenanthe), a migratory passerine bird breeding in an agricultural landscape. For this population, consisting of around 50–120 breeding pairs per year, we partition variation in realized growth rates into environmental contributions from temperature, rainfall, population density, and unexplained random variation via multiple vital rates, and from demographic stochasticity.</li> <li>The case study suggests that variation in first-year survival via the random component, and adult survival via temperature are two main factors behind environmental variation in growth rates. More than half of the variation in growth rates is suggested to come from demographic stochasticity, demonstrating the importance of this factor for populations of moderate size.</li> </ol>
FIGURE 5 in Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities
FIGURE 5 | Comparison of observed and expected number of pairs of species with overlapping vocalization frequencies in each location (significance "**"α = 0.01). The null distributions were generated using 500 randomizations of species distribution across locations (keeping species richness per location unchanged).
FIGURE 4 in Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities
FIGURE 4 | Comparison of observed and expected number of heterospecific pairs of vocalizations with overlapping vocalization times and frequencies in each location (significance "***"α = 0.001, "**"α = 0.01). The null distributions were generated using 500 randomizations of the beginning of vocalizations (keeping number, length and spectral characteristics unchanged).
FIGURE 3 in Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities
FIGURE 3 | Comparison of species vocalization characteristics (A,B), the number of vocalizations per 5-min record (C), and number of species recorded per location (D) between Costa Rica (CR) and Hawai'i (HI) (P-value indicates the significance of Wilcoxon's rank sum test).
FIGURE 2 in Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities
FIGURE 2 | List of detected species with their vocalization ranges (left figures) and their locations of occurrence (right figures) in Costa Rica and Hawai'i. On the left figures, gray background represents potential overlapping in a given frequency, the darker the background, the higher the number of species using this frequency.
FIGURE 1 in Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities
FIGURE 1 | Species accumulation curves (mean of 500 iterations) for each of six recording locations in Costa Rica and Hawai'i.
Performance of akaike information criterion and bayesian information criterion in selecting partition models and mixture models
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Data from: Partitioning variance in population growth for models with environmental and demographic stochasticity
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Isotopic niche partitioning and individual specialization in an Arctic raptor guild
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Life history strategies complement niche partitioning to support the coexistence of closely related Gilliamella species in the bee gut
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Dataset and codes for: Partitioning the apparent temperature sensitivity between autotrophic and heterotrophic protists
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Data and code from: The overlooked link between different resource partitioning strategies and plant species richness in tropical alpine ecosystems
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Widespread temporal niche partitioning in an adaptive radiation of cichlid fishes
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Can diet niche partitioning enhance sexual dimorphism?
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Data from: Pop‐off data storage tags reveal niche partitioning between native and non‐native predators in a novel ecosystem
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Microscopic images and schematics illustrating processes of microenvironment sensing and cortical actomyosin partitioning in T cells
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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)
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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.