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120 results for “resource limitation”
Resources for The Fundamental Limit of Jet Tagging
<p>Resources related to The Fundamental Limit of Jet Tagging (arxiv:2411.02628)</p> <p>Includes:</p> <p>-In total 11,200,0000 qcd and 11,200,0000 top jets generated from corresponding transformer-based models (Tmodels) trained using the JetClass Dataset.</p> <p>-The trained Tmodels.</p> <p>-The LLR predictions from the Tmodels, for different number of constituents.</p> <p>-The predictions corresponding to the classifier-based jet taggers.</p>
Data from: Bees go up, flowers go down: Increased resource limitation from late spring to summer in agricultural landscapes
<p>Data underlying the publication "Bees go up, flowers go down: Increased resource limitation from late spring to summer in agricultural landscapes". Site coordinates are excluded from this dataset for data protection.</p>
Data from: Mast fruiting in a large tropical African legume tree provides evidence for the nutrient resource limitation hypothesis
<p>The large grove-forming tropical tree <em>Microberlinia bisulcata</em> (Fabaceae subfamily Detarioideae) at Korup, Cameroon, shows strong mast fruiting. Reproductive allocation is considerable. The site has very nutrient-poor soil. To test the nutrient resource limitation hypothesis, phenological recordings between 1989 and 2017 were matched with climate variables and analyzed using logistic time-series regression. Masting happened mostly on 2- or 3-year cycles. A strong predictor was mean daily rainfall in the dry season: low in the current year of masting and high in the year prior. Less strongly predictive was the increase in dry season radiation between prior and mast years. Masting events showed no relationship to annual stem increment, nor with local plantation yields. Later, the normally heavy mastings became moderate after two attacks by caterpillars. Collated studies of fallen leaf nutrient concentrations showed that P increased markedly, K rose and fell, but N and Mg changed little, in the inter-mast interval. P and K were likely being accumulated and stored and then triggered masting events when internal thresholds were crossed. The drier season prior to masting enabled a rise in C, and the wetter season the year before, with higher soil moisture, enabled better acquisition and uptake of nutrients by roots and mycorrhizas. The main storage of P may be in bark and branches, that for K on soil organic-colloids. A rooting-fruiting trade-off in C allocated over a minimal 2-year cycle is implied. The hypothesis is that synchrony among masting trees may be achieved, in part, by equilibration of P across the mycorrhizal network. The long-term driver appears to be the inherent year-to-year stochasticity of dry-season rainfall, the realization of which leads to an important refinement of the hypothesis. Life history strategy linked to nutrient resource dynamics provides a plausible explanation and more advanced hypothesis for the masting events observed.</p>
Data and R code from: Resource quantity and quality co-limit consumer production in forest streams
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Data from: Eco–enzymatic stoichiometry unveils resource limitations in soil microorganisms during subtropical vegetation restoration
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Data from: Mast fruiting in a large tropical African legume tree provides evidence for the nutrient resource limitation hypothesis
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Data from: Life-history theory provides a framework for detecting resource limitation: a test of the Nutritional Buffer Hypothesis
<p>For ungulates and other long-lived species, life-history theory predicts that nutritional reserves are allocated to reproduction in a state-dependent manner because survival is highly conserved. Further, as per-capita food abundance and nutritional reserves decline (i.e., density-dependence intensifies), reproduction and recruitment become increasingly sensitive to weather. Thus, the degree to which weather influences vital rates should be associated with proximity to nutritional carrying capacity—a notion that we refer to as the Nutritional Buffer Hypothesis. We tested the Nutritional Buffer Hypothesis using six moose (<i>Alces alces</i>) populations that varied in calf recruitment (33-69 calves/ 100 cows). We predicted that populations with high calf recruitment were nutritionally buffered against the effects of unfavorable weather, and thus were below nutritional carrying capacity. We applied a suite of tools to quantify habitat and nutritional condition of each population and found that increased browse condition, forage quality, and body fat were associated with increased pregnancy and calf recruitment, thereby providing multiple lines of evidence that declines in calf recruitment were underpinned by resource limitation. From 2001 to 2015, recruitment was more sensitive to interannual variation in weather (e.g., winter severity, drought) and plant phenology (e.g., duration of spring) for populations with reduced browse condition, forage quality, and body fat, suggesting these populations lacked the nutritional reserves necessary to buffer demographic performance against the effects of unfavorable weather. Further, average within-population calf recruitment was determined by regional climatic variation, suggesting that the pattern of reduced recruitment near the southern range boundary of moose stems from an interaction between climate and resource limitation. When coupled with information on habitat, nutrition, weather, and climate, life-history theory provides a framework to estimate nutritional limitation, proximity to nutritional carrying capacity, and impacts of climate change for ungulates.</p>
Data from: Diet variability among insular populations of Podarcis lizards reveals diverse strategies to face resource-limited environments
Access to resources is a dynamic and multi-causal process that determines the success and survival of a population. It is therefore often challenging to disentangle the factors affecting ecological traits like diet. Insular habitats provide a good opportunity to study how variation in diet originates, in particular in populations of mesopredators such as lizards. Indeed, high levels of population density associated with low food abundance and low predation are selection pressures typically observed on islands. In the present study, the diet of eighteen insular populations of two closely related species of lacertid lizards (Podarcis sicula and Podarcis melisellensis) was assessed. Our results reveal that despite dietary variability among populations, diet taxonomic diversity is not impacted by island area. In contrast, however, diet disparity metrics, based on the variability in the physical (hardness) and behavioral (evasiveness) properties of ingested food items, are correlated with island size. These findings suggest that an increase in intraspecific competition for access to resources may induce shifts in functional components of the diet. Additionally, the two species differed in the relation between diet disparity and island area suggesting that different strategies exist to deal with low food abundance in these two species. Finally, sexual dimorphism in diet and head dimensions is not greater on smaller islands, in contrast to our predictions.
Data for: "Above and below ground trait coordination in tree seedlings depend on the most limiting resource: A test comparing a wet and a dry tropical forest in Mexico" by L. Sanaphre-Villanueva, F. Pineda-Garcia, W. Dattilo, L. F. Pinzon-Perez, A. Ricaño Rocha, H. Paz.
<p>These data represent those published in “Above and below ground trait coordination in tree seedlings depend on the most limiting resource: A test comparing a wet and a dry tropical forest in Mexico” by L. Sanaphre-Villanueva, F. Pineda-Garcia, W. Dattilo, L. F. Pinzon-Perez, A. Ricaño Rocha, H. Paz. PeerJ. 2022.</p>
Data from: Implementation of a pediatric telemedicine and medication delivery service in a resource-limited setting: A pilot study for clinical safety and feasibility
<p>Objective: Determine the clinical safety and feasibility of implementing a telemedicine and medication delivery service (TMDS) to address gaps in nighttime healthcare access for children in low-resource settings.</p> <p>Results: A total of 391 cases were enrolled from September 9th, 2019 to January 19th, 2021; 89% (347) received a household visit. Most cases were triaged as mild or moderate (92%; 361). Among the severe cases, 83% (20) sought subsequent referred care. The most common complaint was a respiratory problem (63%; 246). At 10-days, 95% (329) of parents reported their child's condition as "improved" or "recovered". Ninety-nine percent (344) rated the TMDS as "good" or "great". The median phone consultation was 20 minutes, time to arrival at the household was 73 minutes and total workflow per case was 114 minutes.</p> <p>Conclusion: The TMDS was a feasible healthcare delivery model with high rates of improved clinical status at 10-days.</p>
Effect of resource limitation on host post-infection survival and systemic pathogenic growth
<p>In the experiments presented here, we explore the effect of resource limitation, in form of starvation (which leads to decrease in accessible resources and depletion of reserves) and sexual activity (which leads to reallocation of resources from somatic defence towards reproduction), on immune function of female <em>Drosophila melanogaster</em> flies. We infected females with five bacterial pathogens and measured their post-infection survival when subjected to either starvation or sexual activity (mating). Additionally, we measured within host pathogen levels in case of three of these pathogens. Based on previous literature, we predicted that both modes of resource limitation will increase post-infection mortality, but only sexual activity will lead to increase of pathogen load (because of compromised immune function), while starvation will either not affect or reduce pathogen loads (because of reduced availability of resources for the pathogen to proliferate within the host). Our results indicate that both starvation and sexual activity can lead to increased within-host pathogen levels, in addition to increased post-infection mortality, but in a pathogen-specific manner.</p>
Energetic constraints on body-size niches in a resource-limited marine environment
<p><span>Body size of life on Earth spans many orders of magnitude, and with it scales the energetic requirements of organisms. Thus, changes in environmental energy should impact community body-size distributions in predictable ways by reshaping ecological and niche dynamics. We examine how carbon, oxygen, and temperature, three energetic drivers, impact community size-based assembly in deep-sea bivalves. We demonstrate that body-size distributions are influenced by multiple energetic constraints. Relaxation in these constraints leads to an expansion of body-size niche space through the addition of novel large size classes, increasing the standard deviation and mean of the body-size distribution. With continued Anthropogenic increases in temperature and reductions in carbon availability and oxygen in most ocean basins, our results point to possible radical shifts in invertebrate body size with the potential to impact ecosystem function.</span></p>
Fig. 2 in Impacts of resource limitations on the reproduction behaviour in the Agile Frog (Rana dalmatina) on the territory of Natura park "Shumensko plato"
Fig. 2. Male and female Rana dalmatina in an artificial basin in amplexus for 12 days.
Fig. 1 in Impacts of resource limitations on the reproduction behaviour in the Agile Frog (Rana dalmatina) on the territory of Natura park "Shumensko plato"
Fig. 1. Registered egg-clutches out of the water near the ponds.
Resources do not limit compensatory response of a tallgrass prairie plant community to the loss of a dominant species
<p>The effect of species loss on ecosystem productivity is determined by both the functional contribution of the species lost, and the response of the remaining species in the community. According to the mass-ratio hypothesis, the loss of a dominant plant species, which has a larger proportionate contribution to productivity, is expected to exert an overwhelming effect on this important ecosystem function. However, via competitive release, loss of a dominant species can provide the opportunity for other plant species to establish, thrive and become abundant in the community, potentially compensating for the function lost. Furthermore, if resource limitation is removed, then compensatory response of function to the loss of a dominant species should be greater and more rapid than if resources are more limiting.</p> <p>To evaluate how resources may limit compensation of aboveground productivity to the loss of a dominant plant species, we experimentally removed the C<sub>4</sub> perennial tallgrass, <em>Andropogon gerardii</em>, from intact plant communities. We added water for four years, as well as nitrogen in the fourth year, to test the effect of resource limitation on the compensatory response.</p> <p>Overall, aboveground biomass production increased in the remaining community with both water and nitrogen addition. However, this increase in biomass production was not sufficient to fully compensate for the loss of A. gerardii, indicating water and nitrogen were not limiting short-term compensation in this community.</p> <p>Following the removal of the dominant species, there was a reordering of species abundances in the community, rather than changes in species richness. The C<sub>4</sub> grass <em>Bouteloua curtipendula</em> was the most responsive species, increasing by 57.9% in abundance with water addition and 91.0% with both water and nitrogen addition. Despite this dramatic increase in abundance, its short stature and lower per capita biomass production prevented this species from compensating for the loss of <em>A. gerardii</em>.</p> <p>Our results suggest that short-term compensation after the loss of a dominant plant species can be hastened by increased resource availability, but ultimately full compensation appears to be limited by the presence and abundance of species in the remaining community that possess traits that allow them compensate for the species lost.</p>
Resource limitation, intragroup aggression, and brain neuropeptide expression in a social wasp
<p>1. Nourishment can have profound effects on social behavior, including aggressive interactions between individuals. However, how nutritional resource availability and limitation affects intraspecific aggression remains somewhat contested. The prevailing theoretical and empirical understanding is that when nutritional resources are limited, inter-individual competition and aggression will increase. However, findings from several social animals suggest that limited nutrition can lead to increased cooperation, including by a reduction in inter-individual aggression.</p> <p>2. We suggest that in social insect colonies, where nourishment is often important in determining differences between the reproductive and non-reproductive worker behavioral castes, the link between an individual's nourishment and their future reproductive potential may be a key missing element of models that predict how nutritional resource availability affects inter-individual aggression.</p> <p>3. We investigated how nourishment influenced intra-colony aggression and its molecular correlates in colonies of the social paper wasp <i>Polistes fuscatus</i>, which workers that maintain flexible reproductive potential as adults. We subjected colonies to either a high or low feeding treatment, and examined subsequent effects on behavior, physiology, and brain gene expression.</p> <p>4. We found that nutritional restriction reduced aggressive interactions, suggesting increased social cohesion when resources are limiting. Thus, individual worker paper wasps appear to have the capacity to adjust their behavior (e.g., reduced aggression) in response to nutritional stress, investing nutritional resources in the colony when resources are limiting, and in the self when resources are abundant.</p> <p>5. Differential brain gene expression results implicate two well-known neuropeptides associated with aggression and/or nutrient signaling across taxa, <i>Tachykinin </i>and <i>Neuropeptide-F</i>, as possible mediators of nutritionally-dependent intra-colony aggression. This adds to a growing understanding that deeply conserved genes associated with core, conserved behaviors such as feeding and aggression in solitary insects can play a role in the regulation of social plasticity in more highly social species.</p>
Data from: Temporal change in floral availability leads to periods of resource limitation and affects diet specificity in a generalist pollinator
<p class="Default"><span>Generalist species are core components of ecological networks and crucial for the maintenance of biodiversity. Generalised species and networks are expected to be more resilient, therefore understanding the dynamics of specialisation and generalisation in ecological networks is a key focus in a time of rapid global climate change. Whilst diet generalisation is frequently studied, our understanding of how it changes over time is limited. We explore temporal variation in diet specificity in the honeybee (<em>Apis mellifera</em>), using pollen DNA metabarcoding of honey samples, through the foraging season, over two years. We find that overall, honeybees are generalists that visit a wide range of plants, but there is temporal variation in the degree of specialisation. Temporal specialisation of honeybee colonies corresponds to periods of resource limitation, identified as a lack of honey stores. Honeybees experience a lack of preferred resources in June when switching from flowering trees in spring to shrubs and herbs in summer. Investigating temporal patterns in specialisation can identify periods of resource limitation that may lead to species and network vulnerability. Diet specificity must therefore be explored at different temporal scales in order to fully understand species and network stability in the face of ecological change.</span></p>
Soil microbial relative resource limitation exhibited contrasting seasonal patterns along an elevational gradient in Yulong snow mountain
<p>1. Microbial relative resource limitations represented by enzyme stoichiometry reflect the relationship between microbial nutrient requirements and nutrient status in soil, but the issue on whether alterations in environments along elevational gradients affect the magnitude of microbial relative resource limitations remains unresolved.</p> <p>2. Here, we examined seasonal patterns in microbial relative carbon (C) and phosphorus (P) limitations indicated by vector lengths and angles using relative proportional enzymatic activities and key controlling factors along an elevational gradient in the Yulong Snow Mountain. We also analyzed the relationships between microbial metabolic processes and microclimates (i.e., soil moisture and temperature), soil properties (i.e., pH and soil texture), and microbial attributes (i.e., microbial biomass and fungal: bacterial ratio).</p> <p>3. We found that soil microbial relative C limitation decreased with increasing elevations, with lower levels observed in the dry season than in the wet season. In contrast, soil microbial relative P limitation varied significantly with elevations, with linearly increasing trends in wet seasons but unimodal trends in dry seasons. Meanwhile, we found higher relative C limitation in the coniferous forest but higher relative P limitation in the broad-leaved forest. Notably, soil microbial relative C limitation was primarily affected by the soil microenvironment (i.e., soil temperature) and substrate quantity (i.e., the ratio of soil dissolved organic C to available P), whereas soil microbial relative P limitation could be alleviated by increasing microbial relative C limitation combined with increasing soil pH. Additionally, the significant linear pattern of the C use efficacy with elevations was only observed in the wet seasons, which was directly influenced by soil microclimates and microbial relative C limitation.</p> <p>4. Overall, our results provided important information for better understanding the essential role of microbial processes in the regulation of C and P cycling in vulnerable subtropical mountain ecosystems.</p>
Data from: Parasites, depredators, and limited resources as potential drivers of winter mortality of feral honeybee colonies in German forests
<p>Wild honeybees (<em>Apis mellifera</em>) are considered extinct in most parts of Europe. The likely causes of their decline include increased parasite burden, lack of high-quality nesting sites and associated depredation pressure, and food scarcity. In Germany, feral honeybees still colonize managed forests, but their survival rate is too low to maintain viable populations. Based on colony observations collected during a monitoring study, data on parasite prevalence, experiments on nest depredation, and analyses of land cover maps, we explored whether parasite pressure, depredation or expected landscape-level food availability explain feral colony winter mortality. Considering the colony-level occurrence of 18 microparasites in the previous summer, colonies that died did not have a higher parasite burden than colonies that survived. Camera traps installed at cavity trees revealed that four woodpecker species, great tits, and pine martens act as nest depredators. In a depredator exclusion experiment, the winter survival rate of colonies in cavities with protected entrances was 50% higher than that of colonies with unmanipulated entrances. Landscapes surrounding surviving colonies contained on average 6.4 percentage points more cropland than landscapes surrounding dying colonies, with cropland being known to disproportionately provide forage for bees in our study system. We conclude that the lack of spacious but well-protected nesting cavities and the shortage of food are currently more important than parasites in limiting populations of wild-living honeybees in German forests. Increasing the density and diversity of large tree cavities and promoting bee forage plants in forests will probably promote wild-living honeybees despite parasite pressure.</p>
Prospective Evaluation of Anti-retroviral Combinations for Treatment Naive, HIV Infected Persons in Resource-limited Settings
ClinicalTrials.gov study NCT00084136. IPD Sharing: Not stated. Countries: 9. Publications: 11.
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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.