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1,740 results for “long-term study”
SGS-LTER Ecosystem Stress Area - long-term point-frame (percent basal cover) dataset following nutrient enrichment stress on the Central Plains Experimental Range in Nunn, Colorado, USA 1982-2011, ARS Study Number 3
This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. Water, nitrogen, and water-plus-nitrogen at levels beyond the range normally experience by shortgrass steppe communities were applied from 1971 through 1975, plant densities were sampled through 1977, and then sampling resumed in 1982, with sampling frequencies changing from annually to every other year. The initial sampling from 1970 to 1974 showed that the water and water plus nitrogen treatments had the strongest effect on plant community structure, both treatments increased biomass, and exotic weed species were noted on the water plus nitrogen treatment. Later sampling from 1982 to 1991 showed a ten-fold increase in exotic weed species on the water plus nitrogen plots as compared to the controls (Milchunas and Lauenroth 1995), a community change that has persisted on this site due to a chronic elevation of soil nitrogen caused by a plant tissue/soil organic matter feedback mechanism (Vinton and Burke 1995). In 1998, Six new treatments were superimposed on the historic study site. The six new treatments were: control, sugar, lignin, sawdust, lignin and sugar, and sawdust and sugar.In 2010, plots will be sampled every 5 years. Our objective in this study is to examine how plant communities change through time and explore implications of these changes for monitoring
Data from: Avian ecological succession in the Amazon: a long-term case study following experimental deforestation
<p>Approximately 20% of the Brazilian Amazon has now been deforested, and the Amazon is currently experiencing the highest rates of deforestation in a decade, leading to large-scale land-use changes. Roads have consistently been implicated as drivers of ongoing Amazon deforestation and may act as corridors to facilitate species invasions. <span>Long-term data, however, are necessary to determine how ecological succession alters avian communities following deforestation and whether established roads lead to a constant influx of new species. </span> </p> <p>We used data across nearly 40 years from a large-scale deforestation experiment in the central Amazon to examine the avian colonization process in a spatial and temporal framework, considering the role that roads may play in facilitating colonization.</p> <p>Since 1979, 139 species that are not part of the original forest avifauna have been recorded, including more secondary forest species than expected based on the regional species pool. Among the 35 species considered to have colonized and become established, a disproportionate number were secondary forest birds (63%), almost all of which first appeared during the 1980s. These new residents comprise about 13% of the current community of permanent residents.</p> <p><span>Widespread generalists associated with secondary forest colonized quickly following deforestation, with few new species added after the first decade, despite a stable road connection. Few species associated with riverine forest or specialized habitats colonized, despite road connection to their preferred source habitat. </span>Colonizing species remained restricted to anthropogenic habitats and did not infiltrate old-growth forests nor displace forest birds.</p> <p>Deforestation and expansion of road networks into <i>terra firme </i>rainforest will continue to create degraded anthropogenic habitat. Even so, the initial pulse of colonization by non-primary forest bird species was not the beginning of a protracted series of invasions in this study, and the process appears to be reversible by forest succession. </p>
Data from: Plant demographic and functional responses to management intensification: a long-term study in a Mediterranean rangeland
1. Understanding how functional traits, which are key for plant functioning, relate to demographic parameters of populations is central to tackle pending issues in plant ecology such as the forecast of the fate of populations and communities in a changing world, the quantification of community assembly processes or the improvement of species distribution models. We addressed this question in the case of species from a Mediterranean rangeland of southern France. 2. Changes in species abundance in response to management intensification (fertilization and increased grazing pressure) were followed over a 28-year period. Probabilities of presence, and elasticities of the changes in the probability of space occupancy to colonization and survival, which are analogues of demographic parameters, were calculated for 53 species from the time series of abundance data using a space occupancy model. Nine quantitative traits pertaining to resource use, plant morphology, regeneration and phenology were measured on these species and related to demographic parameters. 3. The long-term dynamics of species in response to management intensification was associated with major changes in functional traits and strategies. Changes in the probability of occurrence – analogous to population growth rate - were correlated with traits describing the fast-slow continuum of leaf functioning. The elasticity of population growth rate to colonization was significantly related to reproductive plant height and seed mass, and to a lower extent, to leaf carbon isotopic ratio. 4. Synthesis. The functional response of species to management intensification corresponds to a shift along the second axis of a recently identified global spectrum of plant form and function, which maps, to some extent, onto the fast-slow continuum of life-history strategies. By contrast, the elasticity of colonization relates to the global spectrum axis capturing the size of organs. Seed mass contributes to this axis and is assumed to relate to one of the important traits structuring the reproductive strategy axis of life histories as well, namely net reproductive rate. While this mapping between functional and life-history traits is appealing, further tests in contrasting types of communities are required to assess its degree of generality.
Figure 3 in Ilha Grande, one of the locations with the most records of bat species (Mammalia, Chiroptera) in Rio de Janeiro state: results of a long-term ecological study
Figure 3. Relationship between number of species in the Phyllostomidae family (A) and number of captures in the Phyllostomidae family, (B) and capture effort (h.m²) in bat inventories in Rio de Janeiro state. Numbers correspond to locations listed in Table IV. Dots: cross = study 1 on Ilha Grande; square = study 2 on Ilha Grande; star = study 3 on Ilha Grande; triangle = study 4 on Ilha Grande; black circle = study 5 on Ilha Grande; grey circle = other studies in Rio de Janeiro state.
Figure 1 in Ilha Grande, one of the locations with the most records of bat species (Mammalia, Chiroptera) in Rio de Janeiro state: results of a long-term ecological study
Figure 1. Map of Ilha Grande with sampling points of the five studies described in this paper, conducted between 1998 and 2018 on Ilha Grande, Angra dos Reis, Rio de Janeiro state, Brazil. A map of South America is shown, detailing the location of the state of Rio de Janeiro, in southeastern Brazil, while in the enlargement is shown the state of Rio de Janeiro detailing the location of Ilha Grande.
Figure 2 in Ilha Grande, one of the locations with the most records of bat species (Mammalia, Chiroptera) in Rio de Janeiro state: results of a long-term ecological study
Figure 2. Locations in Rio de Janeiro state where bat inventories have been conducted. Numbers correspond to locations in Table 4. A map of South America is shown, detailing the location of the state of Rio de Janeiro in southeastern Brazil.
A long-term study of size variation in Northern Goshawk Accipiter gentilis across Scandinavia, with a focus on Norway
<p><span>Changing climate and growing human impacts are resulting in globally rising temperatures and the widespread loss of habitats. How species will adapt to these changes is not well understood. The Northern Goshawk (<em>Accipiter</em> <em>gentilis</em>) can be found across the Holarctic but is coming under more intense pressure in many places. Studies of recent populations in Finland and Denmark have shown a marked decline in body size of Northern Goshawks over the past century. Here we investigate long-term changes to Norwegian populations of Northern Goshawk by including material from the Middle Ages. We measured 240 skeletons of modern Northern Goshawks from Norway, Sweden, Denmark and Finland, and 89 Medieval Goshawk bones. Our results show that Norwegian and Swedish female Goshawks have decreased in size over the past century, whilst males showed little decline. Medieval female Goshawks were larger than contemporary females. A decline in forest habitats and a concomitant shift towards smaller prey likely drove a shift to smaller body size in Northern Goshawks. Our study shows that significant body size changes in birds can occur over relatively short time spans in response to environmental factors, and that these effects can sometimes differ between sexes. </span></p>
Dataset: Lodgepole pine Pinus contorta Douglas ex Loudon invasion in subarctic Iceland: evidence from a long-term study.
<p>This dataset supports the paper <em>Lodgepole Pine (Pinus contorta Douglas ex Loudon) Invasion in Subarctic Iceland: Evidence from a Long-Term Study</em>, published in <em>NeoBiota</em>. It includes the following files:</p> <ol> <li><strong>Point_data_distribution.csv</strong>: Contains distribution point data for <em>Pinus contorta</em> in Steinadalur, using the WGS 84 coordinate reference system (EPSG:4326).</li> <li><strong>Plot_data_pinus.csv</strong>: provides data on plant species richness within study plots.</li> <li><strong>Transects_data.csv</strong>: Includes information on the density of <em>P. contorta</em> along transects.</li> </ol>
Long-term study shows that increasing body size in response to warmer summers is associated with a higher mortality risk in a long-lived bat species
<p>Change in body size is one of the universal responses to global warming, with most species becoming smaller. While small size in most species corresponds to low individual fitness, small species typically show high population growth rates in cross-species comparisons. It is unclear, there- fore, how climate-induced changes in body size ultimately affect population persistence. Unravelling the relationship between body size, ambient temperature and individual survival is especially important for the conservation of endangered long-lived mammals such as bats. Using an individual-based 24-year dataset from four free-ranging Bechstein'sbat colonies (Myotis bechsteinii), we show for the first time a link between warmer summer temperatures, larger body sizes and increased mortality risk. Our data reveal a crucial time window in June–July, when juveniles grow to larger body sizes in warmer conditions. Body size is also affected by colony size, with larger colonies raising larger offspring. At the same time, larger bats have higher mortality risks throughout their lives. Our results highlight the importance of understanding the link between warmer weather and body size as a fitness-relevant trait for predicting species-specific extinction risks as consequences of global warming.</p>
Evolution repeats itself in replicate long-term studies in the wild
<p>The extent to which evolution is repeatable remains debated. Here we study changes over time in the frequency of cryptic color-pattern morphs in 10 replicate long-term field studies of a stick-insect, each spanning at least a decade (across 30 years of total data). We find predictable 'up-and-down' fluctuations in stripe frequency in all populations, representing repeatable evolutionary dynamics based on standing genetic variation. A field experiment demonstrates that these fluctuations involve negative frequency-dependent natural selection (NFDS). These fluctuations rely on demographic and selective variability that pushes populations away from equilibrium, such that they can reliably move back towards it via NFDS. Finally, we show that the origin of new cryptic forms is associated with multiple structural genomic variants such that which mutations arise affects evolution at larger temporal scales. Thus, evolution from existing variation is predictable and repeatable, but mutation adds complexity even for traits evolving deterministically under natural selection.</p>
Long-term ecological studies' practices and goals for trainees
<p>We created a survey for the other authors in the 2024 <em>Ecology Letters</em> special issue on very long-term ecological studies about their practices and goals for trainees. We received 27 responses from researchers around the world studying a broad range of organisms across ecosystems. In more than half of the responding programs, undergraduate students collect, curate, and analyze data, as well as develop research questions, present at conferences, and contribute to writing scientific papers. Unlike our program, which primarily recruits from one university, other long-term studies often target a variety of institutions (79% of respondents). About half reported targeted recruitment of students from marginalized identities and a similar proportion paid students for their work. Students were slightly more likely to collaborate with a cohort of other students (3.8 in 1-5 Likert scale) and have peer cohort building activities (3.6 in 1-5 Likert scale). When asked to rank the helpful characteristics of long-term studies to undergraduate students, top choices included "links between research, internship, classes", "extensive professional networks", "rich data", and "robust logistics". The rank of "paid salaries" was split, with about a third of the programs ranking it least helpful to students but the other third of programs ranking it either as the first or second most helpful attribute of long-term programs. Based on comments related to funding, the low salary ranking might be associated with student funding opportunities available through university grants or independent fellowships. Overall, this suggests the most impactful transformation long-term studies can make is to advocate for paying trainees in future grant proposals.</p>
Analysis results for association study of long-term kidney transplant rejection using whole-exome sequencing
<p>Association study results for long-term kidney transplant rejection. Single-variant association results are provided as Plink output files. Meta-analysis results are provided as METAL output files. FDR results are sorted lists of the top association result from random sample label permutations and are included with the plink and meta-analysis results. SKAT and GSEA results are provided for gene and pathway level analyses, respectively.</p>
Long-term data from field erosion plot studies in eastern Austria
<p>Long-term runoff plot experiments were conducted at three sites in eastern Austria to evaluate the impact of conservation tillage. Following soil tillage treatments were investigated: 1) conventional tillage with ploughing in fall (CT), 2) mulch tillage with cover crops during winter period (MT), and 3) no tillage with cover crops during winter period (NT). Soil textures range from silt loam to loam.</p> <p>Datasets include for each site and each year the period of operation of the plots, the planted crop, the annual precipitation, surface runoff, soil loss, surface losses of nitrogen, phopshorus and soil organic carbon as well as absolute and relative crop yields.</p>
Long-term data from field erosion plot studies in eastern Austria
<p>Long-term runoff plot experiments were conducted at three sites in eastern Austria to evaluate the impact of conservation tillage. Following soil tillage treatments were investigated: 1) conventional tillage with ploughing in fall (CT), 2) mulch tillage with cover crops during winter period (MT), and 3) no tillage with cover crops during winter period (NT). Soil textures range from silt loam to loam.</p> <p>Datasets include for each site and each year the period of operation of the plots, the planted crop, the annual precipitation, surface runoff, soil loss, surface losses of nitrogen, phopshorus and soil organic carbon as well as absolute and relative crop yields.</p>
Database on chemotherapy-induced cognitive impairment and its long-term development in patients with breast cancer - results from the observational CICARO Study
<p>Raw data and edited data on the observational CICARO-study on chemotherapy-induced cognitive impairment and its long-term development in patients with breast cancer</p>
Data for: Grazing effects of wintering geese on grassland yield: A long-term study from NW-Germany
<p>Conflicts between grassland farming and wintering geese stimulated a long-term study on goose-dependent yield losses. In the period 1996-2018 the loss of dry biomass of the first harvest increased from ca. 15 % to 50 % which corresponds with changes in the number and migratory behaviour of the barnacle goose. In contrast we found no decline in grassland yields with increasing number of greater white-fronted geese. The second harvest was not affected by wintering geese. The present study forms the basis for a fair and comprehensible system of compensation payments fo affected farmers.</p>
Tailored machine learning for evaluating the long-term diabetes risk in older individuals: Findings from The Irish Longitudinal Study on Ageing (TILDA)
<p>The original data for "Tailored machine learning for evaluating the long-term diabetes risk in older individuals: Findings from The Irish Longitudinal Study on Ageing (TILDA)" that published in BMJ Open.</p>
Dataset for study Long-term changes in urban bird populations: correspondence of the trends between urban and rural areas
<p>Dataset used for a study "Long-term changes in urban bird populations: correspondence of the trends between urban and rural areas"</p> <p>Data structure:</p> <p>Type = type of environment (R - rural, U - urban)<br> POID = unique identifier of each census point across all transects<br> Transect = unique identifier of a transect (each contains 20 census points)<br> Point = unique identifier of a point within one transect<br> Year = year of the count<br> Species = scientific name of bird species<br> Count = number of birds counted</p> <p>Each species has its own datafile.</p>
A Long-Term Study To Evaluate Safety And Efficacy Of Pregabalin For Pain Associated With Diabetic Peripheral Neuropathy
ClinicalTrials.gov study NCT00553280. IPD Sharing: Not stated. Countries: 1. Publications: 1.
An Extension of Study Fx-005 Evaluating Long-Term Safety And Clinical Outcomes Of Fx-1006A In Patients With Transthyretin Amyloid Polyneuropathy
ClinicalTrials.gov study NCT00791492. IPD Sharing: Not stated. Countries: 6. Publications: 5.
ScienceDex guides
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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.