Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
54
datasets available to search
ShareScore release 0.9.0
Dataset results
54 results for “stress gradient”
Soil bacterial diversity inventories along small-scale stress gradients in the Arctic, Antarctic, and Chihuahuan Deserts (2022-2023)
Bacteria form the foundation of soil ecosystems in desert ecosystems, driving soil function, diversity, and ecology. Soil physicochemistry is largely dictated by larger topographical variations and can directly drive bacterial community composition and the relationships within. Bacteria may form complex networks of interactions with other bacteria and other soil taxa that have implications for emergent properties such as diversity and stability, but the way these interactions are impacted by environmental stressors remains poorly understood. Here, we sampled soil bacterial communities of three desert ecosystems at different latitudes: the McMurdo Dry Valleys, Antarctica; the northern Chihuahuan Desert, Jornada Experimental Range (JER), New Mexico, USA; and the Arctic tundra at the Canadian High Arctic Research Research Station (CHARS), Victoria Island, Nunavut, Canada. In each system, a holistic stress-gradient was sampled based on local topographical variation, vegetation cover, and water availability. Sampling along the stress-gradient was conducted at four distinct stress levels, namely lower elevation with vegetation cover, lower elevation without vegetation cover, higher elevation with vegetation cover, and higher elevation without vegetation cover. To allow robust biodiversity inference and co-occurrence network construction, 30 replicates were collected at each stress level, and this was done at two independent stress gradients for the Chihuahuan Desert and Arctic sites. The Antarctic samples consisted of two independent stress gradients, one ranging from low, middle to high elevation without vegetation cover, and one consisting of two levels with and without vegetation cover. For each site, soil pH and gravimetric water content was also measured. Each replicate was then sequenced on an Illumina MiSeq for 2x250 paired-end sequencing of the 16S rRNA marker. Sequences were archived in NCBI under BioProject PRJNA1098956, with accession numbers included herein.
Phylogenetic analyses of hub genes accompanying the study "Environmental gradients reveal stress hubs predating plant terrestrialization"
<p>135 ML phylogenies of hub genes identified in the study "Environmental gradients reveal stress hubs predating plant terrestrialization"</p>
Data from: Optimizing Coastal Restoration with the Stress Gradient Hypothesis
Restoration efforts have been escalating worldwide in response to widespread habitat degradation. However, coastal restoration attempts notoriously vary in their ability to establish resilient, high-functioning ecosystems. Conventional restoration attempts disperse transplants in competition-minimizing arrays, yet recent studies suggest that clumping transplants to maximize facilitative, intraspecific interactions improves restoration success. Here, we modify the Stress Gradient Hypothesis to generate predictions about where each restoration design will perform best across environmental stress gradients. We then test the model by combining measurements of physical stress with a field experiment manipulating transplant density and configuration across coastal dune elevational zones and latitudes. In hurricane-damaged Georgia (USA) dunes, grass transplanted in competition-minimizing (low-density, dispersed) arrays exhibited the highest growth, resilience to disturbance, and dune formation in low stress conditions. In contrast, facilitation-maximizing (high-density, clumped) arrays exhibited the highest survivorship in high stress conditions. Transplant survival was significantly lower on Massachusetts compared to Georgia dunes, suggesting there are thresholds above which intraspecific facilitation cannot overcome local stressors. Thus, switching from competition-minimizing to facilitation-maximizing transplant designs with increasing environmental stress can improve multiple metrics of restoration success, suggesting our modified Stress Gradient Hypothesis offers a roadmap for how to rebuild resilient, high-functioning coastal ecosystems.
Data and code for: Pneumococcus co-colonization and the stress-gradient-hypothesis
<p>Pneumococcus serotype co-colonization, caused by the polymorphic bacteria <em>Streptococcus pneumoniae</em>, has been increasingly investigated and reported in recent years. Yet, there is limited information on how co-colonization patterns vary globally, critical for understanding the evolution and transmission dynamics of these bacteria. Here we report on a rich dataset of cross-sectional pneumococcal colonization studies collected from the literature, where we quantified patterns of transmission intensity and co-colonization variation in children populations across different epidemiological settings. Fitting these data to an SIS model with co-colonization under the assumption of quasi-neutrality among multiple interacting strains, our analysis reveals strong patterns of negative co-variation between transmission intensity R<sub>0</sub> and susceptibility to co-colonization <em>k</em>, in support of the stress-gradient-hypothesis (SGH) in ecology. According to this hypothesis, ecological interactions between organisms shift positively as environmental stress increases. In our model higher environmental stress is represented via lower values of the basic reproduction number R<sub>0</sub>, and a shift towards positive interactions is represented via higher vulnerability to co-colonization (higher <em>k</em>) between pneumococcus serotypes.</p>
Data from: Optimizing Coastal Restoration with the Stress Gradient Hypothesis
Open the record for dataset details and reuse information.
Data and code for: Pneumococcus co-colonization and the stress-gradient-hypothesis
Open the record for dataset details and reuse information.
Overyielding in young tree communities does not support the stress-gradient hypothesis and is favoured by functional diversity and higher water availability
<p class="CxSpFirst"><strong>Summary:</strong></p> <ol> <li class="CxSpMiddle">Biodiversity effects on productivity and other ecosystem functions are strongly dependent on climate and resource availability. Based on the stress-gradient hypothesis, under conditions of greater abiotic stress, diversity effects on plant performance are intensified due to the increased relative importance of positive plant interactions. However, whether this hypothesis is consistently applicable in forest systems remains unclear. A field trial was established to test the stress-gradient hypothesis and examine diversity effects on aboveground biomass production of young trees in mixtures exposed to different water availability.</li> <li class="CxSpMiddle">Six native tree species of northern temperate forests (<i>Acer saccharum</i>,<i> Betula papyrifera</i>,<i> Larix laricina</i>,<i> Picea glauca, Pinus strobus</i>,<i> and Quercus rubra</i>) were planted as monocultures and as mixtures of two, four, and six species. For five growing seasons, four replicates of each community were exposed to conditions of either low- or high-water availability created by rainfall exclusion and weekly irrigation, respectively. Growth-years 4 and 5 were significantly different when the climatic water balance of the growing seasons were compared. We tested the effects of functional diversity on: (1) total growth of mixtures under low- and high-water availability, and (2) annual growth in years 4 (higher water availability, 2017) and 5 (lower water availability, 2018).</li> <li class="CxSpMiddle">Annual growth of most species in both years was greater under high- vs. low-water availability. Functional diversity had a significant positive effect on total biomass production and annual growth, and this effect was more strongly expressed under high-water availability. Functional diversity effects on annual growth did not differ between years 4 and 5 regardless of their climatic water balance. Functional and species identity were key to understanding productivity responses to mixture and treatment effects.</li> <li class="CxSpMiddle"> <i>Synthesis</i>: Contrary to the stress-gradient hypothesis, the positive effects of functional diversity on productivity were enhanced by high-water availability and were independent of seasonal water balance.</li> </ol>
Data from: High environmental stress and productivity increase functional diversity along a deep-sea hydrothermal vent gradient
<p>Productivity and environmental stress are major drivers of multiple biodiversity facets and faunal community structure. Little is known on their interacting effects on early community assembly processes in the deep sea (>200 m), the largest environment on Earth. However, at hydrothermal vents productivity correlates, at least partially, with environmental stress. Here, we studied the colonization of rock substrata deployed along a deep-sea hydrothermal vent gradient at four sites with and without direct influence of vent fluids at 1700 m depth in the Lucky Strike vent field (Mid-Atlantic Ridge, MAR). We examined in detail the composition of faunal communities (>20 m) established after two years and evaluated species and functional patterns. We expected the stressful hydrothermal activity to (1) limit functional diversity and (2) filter for traits clustering functionally similar species. However, our observations did not support our hypotheses. On the contrary, our results show that hydrothermal activity enhanced functional diversity. Moreover, despite high species diversity, environmental conditions at surrounding sites appear to filter for specific traits, thereby reducing functional richness. In fact, diversity in ecological functions may relax the effect of competition allowing several species to coexist in high densities in the reduced space of the highly-productive vent habitats under direct fluid emissions. We suggest that the high productivity at fluid-influenced sites supports higher functional diversity and traits that are more energetically expensive. The presence of exclusive species and functional entities led to a high turnover between surrounding sites. As a result, some of these sites contributed more than expected to the total species and functional β-diversities. The observed faunal overlap and energy links (exported productivity) suggest that rather than operating as separate entities, habitats with and without influence of hydrothermal fluids may be considered as interconnected entities. Low functional richness and environmental filtering suggests that surrounding areas, with their very heterogeneous species and functional assemblages, may be especially vulnerable to environmental changes related to natural and anthropogenic impacts, including deep-sea mining.</p>
Data from "Artificial intelligence velocimetry reveals in vivo flow rates, pressure gradients, and shear stresses in murine perivascular flows"
<p>This is data from the paper "Artificial intelligence velocimetry reveals in vivo flow rates, pressure gradients, and shear stresses in murine perivascular flows" published in PNAS, 2023</p> <p>This is the raw imaging data from Mouse 1. The .raw file is the particle tracking video, and Geometry4.mat is a Matlab file containing the 3D z-stack and accompanying segmentation (pvs_smooth). Details regarding the subject and imaging can be found in the published paper.</p> <p>Additional codes and data used in the paper will be made available upon request.</p>
Ecological consequences of plant genotypic diversity within a foundation plant, Spartina alterniflora, are pervasive but not universal across multiple stress gradients
<ol> <li>Plant genotypic diversity can influence population- and community-level processes, yet we have a limited understanding of how these effects vary across environmental gradients that are ubiquitous in nature. </li> <li>We conducted a 2-year field experiment manipulating plant (<em>Spartina</em> <em>alterniflora</em>) genotypic diversity across a natural stress gradient in tidal elevation, both with and without the addition of nutrients. </li> <li> <em>Spartina</em> diversity increased stem production, but the magnitude of this effect was reduced at both the most stressful and most benign endpoints of the combined elevation and nutrient gradient, consistent with recent species diversity studies. Complementarity among individuals likely underpins the observed benefit of <em>Spartina</em> diversity. </li> <li> <em>Spartina</em> diversity also affected the associated marsh community, with higher consumer (<em>Littoraria</em> <em>irrorata</em>) abundance in more diverse plots, owing to both greater <em>Spartina</em> density and increased variation in <em>Spartina</em> traits.</li> <li> <em>Synthesis</em>: The positive effects of <em>Spartina</em> diversity on population- and community-level responses under most environmental conditions highlights the ecological importance of plant genotypic diversity for the maintenance of function across the marsh landscape. </li> </ol>
Overyielding in young tree communities does not support the stress-gradient hypothesis and is favoured by functional diversity and higher water availability
Open the record for dataset details and reuse information.
Complex biotic interactions mediated by shrubs: revisiting the stress-gradient hypothesis and consequences for tree seedling survival
Open the record for dataset details and reuse information.
Data from: Escape from harmful soil biota at high elevations: Plant-soil feedbacks along stress gradients
Open the record for dataset details and reuse information.
Data from: intertidal mussels as ecosystem engineers: maintenance of invertebrate assemblages amid intertidal stress gradients
Open the record for dataset details and reuse information.
Data from: High environmental stress and productivity increase functional diversity along a deep-sea hydrothermal vent gradient
Open the record for dataset details and reuse information.
Ecological consequences of plant genotypic diversity within a foundation plant, Spartina alterniflora, are pervasive but not universal across multiple stress gradients
Open the record for dataset details and reuse information.
Optimizing Coastal Restoration with the Stress Gradient Hypothesis
Open the record for dataset details and reuse information.
Increased sediment load destabilize algal turf at two different fringing reefs; Evaluating responses across a stress gradient, Moorea, French Polynesia, 2016
Seven reefs in Moorea French Polynesia were examined for sediment and turf characteristics to establish a baseline for naturally occurring proportions of sediment within the turf matrix. At each of the seven sites turf filament heights and sediment depths within the turf matrix were measured using a galvanized mesh measuring device calibrated by 1mm increments. All surveys were conducted between 2-3m in depth between April-May of 2016. We then conducted a two-factor experiment where sediment depth was manipulated at two sites surveyed with strong differences in turf communities (Maharepa and Gump). Our experiment ran for 30 days, with sediment treatments maintained every four days.
Dataset related to publication "In silico evaluation of the thermal stress induced by MRI switched gradient fields in patients with metallic hip implant"
<p>The datasets reported in the figures of the article "In silico evaluation of the thermal stress induced by MRI switched gradient fields in patients with metallic hip implant", published on Phys. Med. Biol. 64 245006, 2019.</p> <p>This work focuses on the in silico evaluation of the energy deposed by MRI switched gradient fields<br> in bulk metallic implants and the consequent temperature increase in the surrounding tissues. The results show that the gradient coils can generate local increases of temperature up to some kelvin when acting without radiofrequency excitation. Hence, their contribution in general should not be disregarded when evaluating patients’ safety.</p>
Species diversity of fungal endophytes across a stress gradient for plants
<ul> <li>Foliar fungal endophytes are one of the most diverse guilds of symbiotic fungi found in the photosynthetic tissues of every plant lineage, but it is unclear how plant environments and leaf resource availability shape their diversity.</li> <li>We explored correlations between leaf nutrient availability and endophyte diversity among <i>Pinus muricata </i>and <i>Vaccinium ovatum </i>plants growing across a soil nutrient gradient spanning a series of coastal terraces in Mendocino, California.</li> <li>Endophyte richness decreased in plants with higher leaf nitrogen‐to‐phosphorus ratios for both host species, but increased with sodium, which may be toxic to fungi at high concentrations. Isolation frequency, a proxy of fungal biomass, was not significantly predicted by any of the same leaf constituents in the two plant species.</li> <li>We propose that stressed plants can exhibit both low foliar nutrients or high levels of toxic compounds, and that both of these stress responses predict endophyte species richness. Stressful conditions that limit growth of fungi may increase their diversity due to the suppression of otherwise dominating species. Differences between the host species in their endophyte communities may be explained by host specificity, leaf phenology, or microclimates.</li> </ul>
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.