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.
74
datasets available to search
ShareScore release 0.9.0
Dataset results
74 results for “DIRT”
Autumnal Litter Input in DIRT Litter Manipulation Experiment at Harvard Forest 2008
Climate change will alter forest ecosystem productivity, changing the quantity and quality of detrital inputs to soil and altering rates of soil organic matter (SOM) accumulation and stabilization. To examine changes in forest soil SOM pools, we have used the Detritus Input and Removal Treatments (DIRT) Project to alter organic matter input rates and sources (roots, leaves) to soils, allowing us to measure contributions of organic matter sources to long-term SOM storage at five temperate forests (Harvard Forest, HJ Andrews, Bousson (PA) Experimental Forest (BEF), U. Michigan Biological Station (UMBS), Síkfokut ILTER, Hungary). Organic matter inputs are altered by excluding or adding leaf inputs, or by excluding roots from forested plots. Soil respiration partitioning at HF, BEF, and UMBS shows that soil fertility controls the allocation of C to above- and belowground tissue. At UMBS, glacial outwash sandy soils are extremely low in N, and C released from root respiration plus root litter decomposition is 87% of total soil respiration. Conversely, at the N-rich BEF site, total belowground sources of CO2 are only 61% of soil respiration, with 47% attributed to root litter. These data suggest that at BEF, leaf litter, comprising only 39% of soil respiration, would be a more important source of long-term SOM than root litter. However, soil chemistry and radiocarbon data have shown us that long-term soil C storage is complex. The year 2010 represents the 20-year anniversary of the initiation of DIRT treatments at the Harvard Forest (2010), and we are therefore planning to conduct systematic sampling campaigns for a comprehensive study of changes in SOM quality after long-term manipulation of inputs. One objective is to quantify how 20 years of litter input alterations have affected SOM quantity and quality at the surface (0-20 cm) and deeper in the soil profile (20-100 cm). To uderstand these changes, we need to quantify the quantity and quality of aboveground litter inp
DIRT Litter Manipulation Experiment at Harvard Forest since 1990
The DIRT Experiment (Detritus Input and Removal Treatments) is a long-term study of controls on soil organic matter formation. Our goal is to assess how rates and sources of plant litter inputs control the accumulation and dynamics of organic matter and nutrients in forest soils over decadal time scales. Results from 11 years of field and laboratory studies demonstrate the relative importance of above- and belowground sources on soil organic matter (SOM) dynamics and show emerging long-term non-linear changes in soil carbon release and storage. Treatments established in a mixed hardwood stand in 1990 are: doubling annual aboveground litter (DL), exclusion of aboveground litter (NL), exclusion of root inputs by trenching (NR), and exclusion of aboveground litter and root inputs (NI), on replicated 3m x 3m plots (n=3 for treatments, 6 for controls). The O/A-less treatment, implemented in 1991, tracks the recovery of impoverished soil by replacing O and A horizon soil with B horizon material and allowing normal litter inputs thereafter. Comparison of data among treatments (soil respiration, soil solution chemistry, soil physical and chemical properties, and microfaunal and microbial community structure) allows us to determine the contributions of live roots, above-ground litter, and belowground detritus to SOM and nutrient dynamics in this forest soil. Similar experiments in Pennsylvania, Wisconsin, Oregon, and Hungarian forests provide information on these processes across climate and soil texture gradients. First-year soil respiration results from the Harvard Forest DIRT plots showed that live root respiration, production of aboveground litter (leaf, twig, other fine litter) and fine root detritus each constitute about one-third of C inputs to soil. Soil respiration is influenced more by root inputs than aboveground litter in this forest. CO2 efflux from root-excluded soils (NR, NI) declined to 32% of controls over the first 11 years of treatments as soil C became mo
Stem maps in 4 1-hectare plots in the FASET and DIRT experiments at the University of Michigan Biological Station, Pellston, MI (2006-07)
Our primary objective is to provide an improved understanding of the biological and climatic controls over carbon (C) and energy cycles during and after a successional shift from a mature aspen to a young mixed confer/deciduous forest ecosystem that will be widely distributed across the upper Great Lakes region in coming decades. In Spring 2008, we implemented the Forest Accelerated Succession ExperimenT (FASET) by stem girdling all aspen and birch (gt;6,700 trees, ~35% canopy LAI) within a 39 ha area. A suite of ongoing ecological and meteorological measurements conducted in treatment and control stands before (2007) and after (2008 onwards) the succession treatment are used to quantify effects of climate, species composition, and canopy structure on the forest C cycle. We have established paired treatment and control plots, and surveyed a 25 m grid system within our treatment plots, begun operation of a eddy-covariance tower within the 33 ha treatment plot, conducted intercomparisons of carbon exchange and N allocation between treatment and control plots, remote sensed forest canopy structure, and begun or continued collaborative projects with investigators utilizing this project as a platform for further studies. Our overarching hypothesis is that forest NEP across much of the upper Great Lakes region will increase following transition from aspen dominated ecosystems to those of later-successional species with biologically and structurally more complex canopies. Specific hypotheses: a) Tree mortality will prompt a short-term reduction in NEP. A rapid recovery and stabilization of NEP above that of the control forest will be linked to the magnitude of N leaching losses and the pattern of redistribution of available N. Stands with more species and structurally diverse canopies and greater allocation of N to photosynthetic tissues will have higher NEP. b) Successional change will increase spatial variation in microclimate and nutrient distribution, both of which con
Detrital Inputs and Removal Treatments (DIRT) Experiment at the University of Michigan Biological Station, Pellston, MI (2004-2019)
Ecological research networks functioning across climatic and edaphic gradients are critical for improving predictive understanding of biogeochemical cycles at local through global scales. One international network, the Detrital Input and Removal Treatment (DIRT) Project, was established to assess how rates and sources of plant litter inputs influence accumulations or losses of organic matter in forest soils. DIRT employs chronic additions and exclusions of aboveground litter inputs and exclusion of root ingrowth to permanent plots at eight forested and two shrub/grass sites to investigate how soil organic matter (SOM) dynamics are influenced by plant detrital inputs across ecosystem and soil types. Across the DIRT network described here, SOM pools responded only slightly, or not at all, to chronic doubling of aboveground litter inputs. Explanations for the slow or even negative response of SOM to litter additions include increased decomposition of new inputs and priming of old SOM. Evidence of priming includes increased soil respiration in litter addition plots, decreased dissolved organic carbon (DOC) output from increased microbial activity, and biochemical markers in soil indicating enhanced SOM degradation. SOM pools decreased in response to chronic exclusion of aboveground litter, which had a greater effect on soil C than did excluding roots, providing evidence that root-derived C is not more critical than aboveground litter C to soil C sequestration. Partitioning of belowground contributions to total soil respiration were predictable based on site-level soil C and N as estimates of site fertility; contributions to soil respiration from root respiration were negatively related to soil fertility and inversely, contributions from decomposing aboveground litter in soil were positively related to site fertility. The commonality of approaches and manipulations across the DIRT network has provided greater insights into soil C cycling than could have been revealed at
РИС. 5. Живые особи Arion vulgaris на грунтовой тропинке (фото И.Н. Субботиной) FIG. 5. Live specimens of Arion vulgaris on a dirt trail (photo by I.N. Subbotina) in Новые находки синантропных слиЗней Limacus maculatus и Arion vulgaris (Mollusca, Gastropoda, Stylommatophora) в Беларуси
РИС. 5. Живые особи Arion vulgaris на грунтовой тропинке (фото И.Н. Субботиной) FIG. 5. Live specimens of Arion vulgaris on a dirt trail (photo by I.N. Subbotina)
Data from: Treated like dirt: Robust forensic and ecological inferences from soil eDNA after challenging sample storage
<p>We investigated the effect of storage duration and conditions on the assessment of the soil biota with eDNA metabarcoding. We extracted eDNA from freshly collected soil samples and again from the same samples after storage under contrasting temperature conditions and contrasting exposure (open/closed tubes). We used four different primer sets targeting bacteria, fungi, protists (cercozoans), and general eukaryotes. <span>W</span>e quantified differences in richness, evenness, and community composition. Subsequently, we tested whether we could correctly infer habitat type and original sample identity after storage using a large reference dataset.</p> <p>This repository contains the un-demultiplexed fastq sequences.</p>
Linked collectors and determiners for: Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia.
Natural history specimen data linked to collectors and determiners held within, "Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/8c531d6d-9d32-49fd-8449-12126dac1d5c">https://bionomia.net/dataset/8c531d6d-9d32-49fd-8449-12126dac1d5c</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/8c531d6d-9d32-49fd-8449-12126dac1d5c">https://gbif.org/dataset/8c531d6d-9d32-49fd-8449-12126dac1d5c</a>. Formatted as a Frictionless Data package.
Dirt cheap: An experimental test of controls on resource exchange in an ectomycorrhizal symbiosis
<p>1. To distinguish among hypotheses on the importance of resource-exchange ratios in outcomes of mutualisms, we measured resource (carbon (C), nitrogen (N), and phosphorus (P)) transfers, and their ratios, between Pinus taeda seedlings and two ectomycorrhizal (EM) fungal species, Rhizopogon roseolus and Pisolithus arhizus in a laboratory experiment.</p> <p>2. We evaluated how ambient light affected those resource fluxes and ratios over 3 time periods (10, 20, and 30 weeks), and the consequences for plant and fungal biomass accrual, in environmental chambers.</p> <p>3. Our results suggest that light availability is an important factor driving absolute fluxes of N, P, and C, but not exchange ratios, although its effects vary among EM fungal species. Declines in N:C and P:C exchange ratios over time, as soil nutrient availability likely declined, were consistent with predictions of biological market models. Absolute transfer of P was an important predictor of both plant and fungal biomass, consistent with the excess resource exchange hypothesis, and N transfer to plants was positively associated with fungal biomass.</p> <p>4. Altogether, light effects on resource fluxes indicated mixed support for various theoretical frameworks, while results on biomass accrual better supported the excess resource exchange hypothesis, although among-species variability is in need of further characterization.</p>
A fossil-informed pattern of body size increase and local extinction in Basiceros dirt ants (Hymenoptera: Formicidae)
Open the record for dataset details and reuse information.
Data from: Treated like dirt: Robust forensic and ecological inferences from soil eDNA after challenging sample storage
Open the record for dataset details and reuse information.
Dirt cheap: An experimental test of controls on resource exchange in an ectomycorrhizal symbiosis
Open the record for dataset details and reuse information.
Medieval round shield (dirt, moss, blood stains)
Old round wooden shield with dirt, moss and blood stains. * [**Low poly medieval round shield (optimized)**](https://sketchfab.com/3d-models/low-poly-medieval-round-shield-optimized-532a2fe0c32948f89a49d3e790c65e6d) * [**Low poly medieval round shield (wood & metal)**](https://sketchfab.com/3d-models/low-poly-medieval-round-shield-wood-metal-c25ead50f21b4d7584b3a60af82a65f0) * [**Medieval round shield (red & blue paint)**](https://sketchfab.com/3d-models/medieval-round-shield-red-blue-paint-3fba69e80b7b4ef98792a219db262377) *Blender (2.93), Substance Painter (2020.2.2)* Source: Objaverse 1.0 / Sketchfab
Data from: A phylogenetic analysis of the dirt ants, Basiceros Schulz (Formicidae: Myrmicinae): inferring life histories through morphological convergence
Ants of the genus Basiceros (Hymenoptera: Formicidae: Myrmicinae) are elusive species known only from Neotropical rainforests. Little information is available regarding their natural history, and nothing is known about the phylogenetic relationships among species within the genus. The genus has been the subject of some controversy regarding generic delimitation but is currently a member of the "Basiceros-genus group" following recent classification changes. For mouthparts, labral and mandibular morphologies present considerable variation in the Basiceros-genus group, likely a result of adaptive evolution. In Basiceros, those differences can be observed in the labrum shape and the various degrees of development of the labral cleft and the clypeomandibular space. Here, in an attempt to illuminate the evolution of the group, species boundaries are tested for Basiceros. The evolutionary relationships of its species are investigated using molecular and morphological data. Bayesian inference (BI) and maximum likelihood (ML) analyses of a molecular dataset consisting of up to nine genes (three mitochondrial, six nuclear) and including samples from multiple populations of all known Basiceros taxa recovered the monophyly of the genus and of its species, with two well resolved internal clades: the singularis clade and the disciger clade. Focusing on the female castes of Basiceros, an ancestral state reconstruction is presented for mandibles and labrum morphology. The results suggest that the labrum and clypeomandibular morphologies are highly labile, although phylogenetically important characters in the genus. Mouthpart traits indicate a strong correlated evolutionary history potentially associated with specialized feeding habits.
FIGURE 6. Tholerosoma corrugatum n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 6. Tholerosoma corrugatum n. sp. (A) dorsal view of midbody ring, (C) spiracles on midbody ring, anterior to left (holotype, QM S73993). Tholerosoma monteithi n. gen., n. sp. (B) anterior spiracle on midbody ring, anterior to left (male paratype partly cleaned with ultrasound, QM S73975). Scale bar for (A) = 0.5 mm, for (B) and (C) = 0.1 mm.
FIGURE 2. Desmoxytoides hasenpuschorum n. gen., n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 2. Desmoxytoides hasenpuschorum n. gen., n. sp. (A) leg 6, (B) antenna, (C) anteromedial view of right gonopod telopodite (male paratypes, QM S73967). Setation not shown; dashed line in (C) indicates course of prostatic groove. Scale bar for (A) and (B) = 0.5 mm, for (C) = 0.1 mm.
FIGURE 1. Desmoxytoides hasenpuschorum n. gen., n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 1. Desmoxytoides hasenpuschorum n. gen., n. sp. (A) lateral view of midbody ring; (B) posteroventral view of gonopods in situ; (C) ventral view of telson; (D) dorsal view of midbody ring; (E) enlargement of (A) showing spiracles and metazonite microtubercles (males, QM S73968). Note: the ends of the gonopod telopodites shown in Fig. 1B have rotated during drying; in alcohol-preserved material the curve of the telopodite lies in a nearly transverse plane, as shown in Fig. 2C. Scale bar for (A) – (D) = 0.25 mm, for (E) = 0.1 mm.
FIGURE 5. Tholerosoma monteithi n. gen., n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 5. Tholerosoma monteithi n. gen., n. sp. (A) medial view of right gonopod, (D) antenna, (E) leg 6 (male paratype, QM S73974). Tholerosoma corrugatum n. sp. (B) medial view of right gonopod (holotype, QM S73993), (C) medial view of right gonopod (male paratype, QM S73994), (F) outline sketch of midbody metazonite, showing location of swellings on posterior edge (female paratype, QM S73995). Setation not shown; dashed lines in (A) – (C) indicate course of prostatic groove. Scale bars for (A) – (C) and for (D) and (E) = 0.25 mm.
FIGURE 3. Tholerosoma monteithi n. gen., n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 3. Tholerosoma monteithi n. gen., n. sp. (A) dorsal view of midbody ring (male, QM S73979); (B) dorsal and (C) lateral view of midbody ring (male paratype partly cleaned with ultrasound, QM S73975); (D) close-up of prozonite in (B), anterior at top; (E) close-up of left posterior section of metatergite in (B), anterior at top; (F) close-up of waist in (C), anterior to left. Scale bar for (A) – (C) = 0.5 mm, (D) = 0.05 mm, (E) = 0.02 mm, (F) = 0.01 mm.
FIGURE 7. Localities for Desmoxytoides hasenpuschorum n. gen., n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 7. Localities for Desmoxytoides hasenpuschorum n. gen., n. sp. (left, squares), Tholerosoma monteithi n. gen., n. sp. (centre, triangles) and T. corrugatum n. sp. (centre, stars). Rectangle in Australia map (right) shows boundary of main maps.
FIGURE 4. Tholerosoma monteithi n. gen., n in Dirt-encrusted and dragon millipedes (Diplopoda: Polydesmida: Paradoxosomatidae) from Queensland, Australia
FIGURE 4. Tholerosoma monteithi n. gen., n. sp. (A) gonopods in situ (male, QM S38942); (B) ventral view of telson (male paratype partly cleaned with ultrasound, QM S73975). Scale bars = 0.25 mm.
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.