cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18739/a2rf5kg72
title: Weekly measurements of branch extension growth made on high and low branches of trees growing at the terrace, forest and treeline sites, Alaska, 2011

description: Weekly measurements of branch extension growth made on high and low branches of trees growing at the terrace, forest and treeline sites. Measurements are for branches that grew.
DOI: 10.18739/a2mp4vp2f
title: Ring widths measured on increment cores collected from generally large trees growing at the terrace, forest and treeline sites in Alaska, 1814-2012

description: Ring widths measured on increment cores collected from generally large trees growing at the terrace, forest and treeline sites. Sample size is approximately 25 cores/site.
DOI: 10.34740/kaggle/dsv/9981405
title: BBC Burmese News rss
DOI: 10.18739/a2gx44v82
title: Air temperature, relative humidity, photosynthetically active radiation, soil temperature and soil water content of three contrasting white spruce habitats near the Arctic treeline, Alaska, 2010-2012

description: Hourly measurements of air temperature, relative humidity, photosynthetically active radiation, soil temperature and soil water content of three contrasting white spruce habitats near the Arctic treeline: riverside terrace, forest and treeline. Rainfall data are also included for the terrace.
DOI: 10.18712/nsd-nsd3206-v1
title: Students’ Engagement and Study Habits in Student-Active Early Childhood Teacher Education

description: This study explores the interplay between students’ perceived competence, engagement, study habits, and academic outcomes among early childhood student teachers in a flipped classroom mathematics course in Norway. A quantitative longitudinal study was conducted with 350 early childhood education students who completed questionnaires at the beginning and end of the academic year. Structural equation modelling (SEM) was used to analyse the data. The following model was evaluated with the dataset: High perceived competence enhances students’ emotional engagement, leading to positive feelings of interest and enjoyment in learning activities. Students with high perceived competence are more likely to develop effective study habits, such as consistent reading and proactive learning. Conversely, low perceived competence can lead to behavioural withdrawal and poor academic performance. Emotional engagement energises behavioural and agentic engagement. When emotionally engaged, students are more likely to pay attention, participate actively, and contribute constructively to the learning process. Good study habits often result from high perceived competence and are reinforced by consistent behavioural and agentic engagement. Effective study habits should directly improve academic outcomes by ensuring students are well-prepared and actively engaged in the learning process inside and outside the classroom.
DOI: 10.18739/a2c53f254
title: Estimates of soil nitrogen availability in three contrasting white spruce habitats near the Arctic treeline: riverside terrace, forest and treeline, Alaska, June to August 2011

description: Estimates of soil nitrogen availability between June 28 and August 9, 2011 in three contrasting white spruce habitats near the Arctic treeline: riverside terrace, forest and treeline.
DOI: 10.18739/a27d2q82g
title: Estimates of fine root production made using minirhizotrons on weekly intervals at the terrace, forest and treeline sites, Alaska, 2011

description: Estimates of fine root production made using minirhizotrons on weekly intervals during the 2011 growing season beneath trees growing at the terrace, forest and treeline sites. Units are mm2 of projected fine root area per minirhizotron. The minirhizotrons were installed in September of 2009 and the understory vegetation growing above them was removed by hand on weekly intervals in 2010 and 2011.
DOI: 10.18739/a23r0pv1n
title: Measurements of annual branch extension growth on high and low branches of trees growing at the terrace, forest and treeline sites, Alaska, 2010-2012

description: Measurements of annual branch extension growth during 2010-2012 on high and low branches of trees growing at the terrace, forest and treeline sites. Data are for branches that grew.
DOI: 10.18739/a2000016h
title: Hourly estimates of sap flow during the snow-free seasons of 2010-2012 for trees growing at the terrace, forest and treeline sites in Alaska

description: Hourly estimates of sap flow during the snow-free seasons of 2010-2012 for trees growing at the terrace, forest and treeline sites. Units are L dm-2 sapwood area hr-1. Measurements were made using Dynamax thermal dissipation probes (TDP 30). Probes were installed such that the heater was at a depth of 2.5 cm and the thermocouples were 1.0 cm beneath the bark.
DOI: 10.18739/a2v698d03
title: Canopy gas exchange and growth of white spruce near the Arctic treeline: confronting measurements with models along natural and experimental resource gradients, 2009-2012

description: The position of the arctic treeline has important implications for surface energy budgets and carbon cycling in a changing climate. Modeling efforts suggest these effects are relevant on regional and global scales. Our understanding of the controls on tree growth at the arctic treeline has been developed using tree ring studies, which are necessarily correlative and not mechanistic in nature. These tree ring studies have identified both positive and negative radial growth responses to warming in the later half of the 20th century. Investigators have speculated that negative growth trends reflect an increasing importance of temperature-induced drought stress and that treeline advance may be expected in mesic and wet areas, but not in dry areas, with future climate warming. Recent work has revealed several important complexities that clearly show we have oversimplified the relationships between climate and tree growth at the arctic treeline. Detailed measurements of seasonal changes in tree physiology and growth in response to changes in resource availability are now required to take our understanding to the next level. This work will coordinate continuous measurements of white spruce canopy gas exchange with weekly measurements of branch gas exchange and leader, branch, radial and fine root growth in trees receiving factorial nutrient and water supplements along a gradient of parent material depth. Results of the study will, for the first time: resolve the seasonality of C uptake and water loss in treeline white spruce; compare the seasonality and magnitudes of growth in all major organs; articulate the consequences of changes in resource availability for white spruce gas exchange physiology and growth along a gradient where resource availability varies naturally; and identify a process-based model that accurately describes the relationships between climate and tree growth at the arctic treeline. NSF Program: Arctic Natural Sciences (ANS) Sponsor: University of Alaska Anchorage Campus, 3211 Providence Drive, Anchorage, AK 99508-4614
DOI: 10.18739/a2kp7ts26
title: Soil water samples from the drained thaw lake basin near Barrow, Alaska, used for the Biocomplexity Experiment, 2009

description: In 2009, soil water samples were collected from the drained thaw lake basin used for the Biocomplexity Experiment, near Barrow, Alaska (AK). The northern section of the basin was experimentally flooded. Samples were collected from 0-5 and 5-15 cm depths using Rhizon soil moisture samplers and analyzed for dissolved iron-Fe, organic carbon-C, ultraviolet-UV absorbance at 280nm, ammonium, nitrate, amino N, and phosphate. See Lipson et al. (2012) Biogeosciences 9:1-15.
DOI: 10.18739/a2fx73z99
title: Extractable iron (Fe) at various drained thaw lake basins near Barrow, Alaska, 2009-2011

description: Soils from various drained thaw lake basins near Barrow, Alaska (AK) were extracted with various solvents reflecting different iron (Fe) pools. Values are presented in micromoles per gram (g) and micromoles per cubic centimeter (cm^3) (the latter being more appropriate for comparing light organic and dense mineral layers). See Lipson et al. (2013) Global Biogeochemical Cycles 27:1-11, doi:10.1002/gbc.20038, and Lipson et al. (2010) J Geophys Res-Biogeosci (G) 115, G00I06, doi:10.1029/2009JG001147. The mineral types generally associated with each solvent are indicated.
DOI: 10.18739/a2b56d56c
title: Cation exchange capacity for soils of drained thaw lake basins near Barrow, Alaska, 2010

description: Cation exchange capacity (CEC) and porosity-weighted CEC (Qv) for soils of drained thaw lake basins near Barrow, Alaska (AK) representing young, medium, old and ancient age classes. See Lipson et al. (2013) GBC 27:1-11.
DOI: 10.18739/a26h4cr42
title: Soil electrochemistry data from various drained thaw lake basins near Barrow, Alaska, 2009-2011

description: These data were collected from various drained thaw lake basins near Barrow, Alaska (AK) from 2009-2011, and include pH, oxidation-reduction potential (ORP), electrical conductivity (EC) and dissolved oxygen (DO). At some points thaw depth and water table depth were also measured. The 2009 data set is from the Biocomplexity experiment (Lipson et al. 2012. Biogeosciences 9:1-15); the north section was experimentally flooded, the south and central were not. The 2010 data was from four basins representing young, medium, old and ancient age classes (Lipson 2013. Global Biogeochemical Cycles 27:1-11, doi:10.1002/gbc.20038). The 2011 data includes replicate basins of each age class.
DOI: 10.18739/a22r3nz0x
title: Ground penetrating radar of drained thaw lake basins near Barrow, Alaska, 2010

description: Ground Penetrating Radar (GPR) surveys were conducted using a Pulse Ekko Pro system, manufactured by Sensors and Software, with 500 megahertz (MHz) antennae. Surface common-offset measurements were collected using a trace spacing of 0.05 meter (m) and 16 stacks per trace. Transects were run over frozen soil in early June, 2010. Snow was removed to improve signal penetration. Based on common midpoint soundings, the velocity was 0.12 meters per nanosecond (m/ns) for the Old transects and 0.10 to 0.05 m/ns for the Young transects.
DOI: 10.18739/a2z02z945
title: Iron (Fe) dissolved in soil pore water measured at various locations within the drained thaw lake basin near Barrow, Alaska, 2012

description: In 2012, iron (Fe) dissolved in soil pore water was measured at various locations within the drained thaw lake basin previously used for the Biocomplexity Experiment (BE), near Barrow, Alaska (AK). Collars were arranged in three clusters within the central region of the BE, referred to as A, B and C. Soil water was sampled with Rhizon water samplers, preserved with hydrochloric acid (HCl) and analyzed colorimetrically with 1,10-phenanthroline.
DOI: 10.18739/a2t727h0d
title: Methane and carbon fluxes measured at various locations within the drained thaw lake basin near Barrow, Alaska, 2012

description: In 2012, gas fluxes were measured at various locations within the drained thaw lake basin previously used for the Biocomplexity Experiment (BE), near Barrow, Alaska (AK). In two separate experiments collars were arranged in three ice wedge polygons within the central region of the BE, referred to as A, B and C. Carbon dioxide-CO2 and methane-CH4 fluxes were measured using a Los Gatos Research portable trace gas analyzer.
DOI: 10.15468/dl.u7u7at
title: Occurrence Download

description: A dataset containing 3 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ledermanniella kamerunensis (Engl.) C.Cusset"
 ]
}

 The dataset includes 3 records from 3 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027844-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2pg1hp6n
title: Iron (Fe) dissolved in soil pore water collected from 16 drained thaw lake basins near Barrow, Alaska, 2011

description: Soil pore water was collected from 16 drained thaw lake basins near Barrow, Alaska (AK) and analyzed colorimetrically for Fe(II) and Fe(III). Three to five basins of each age class (as determined by Hinkel and others) were chosen. Transects were established in each basin (most were 30 meter (m) long, except the plots established in 2010, which were up to 72 m long). Samples (generally five per transect) were collected into vacutainers from Rhizon soil water samplers, preserved with a drop of hydrochloric acid (HCl), and analyzed using 1,10-phenanthroline, with and without ascorbate for total Fe and Fe(II), respectively. Fe(III) was determined by difference.
DOI: 10.15468/dl.t53u5m
title: Occurrence Download

description: A dataset containing 75 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Sri Lanka",
 "TaxonKey is Moschiola Gray, 1852"
 ]
}

 The dataset includes 75 records from 23 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027842-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2jq0sw30
title: Dissolved carbon dioxide and methane in soil pore water collected from various drained thaw lake basins near Barrow, Alaska, 2011

description: Soil pore water collected from various drained thaw lake basins near Barrow, Alaska (AK) was analyzed for dissolved carbon dioxide and methane. Soil water samples (0-10 centimeter (cm) depth) were collected using Rhizon soil moisture samplers and dissolved gases were measured by gas chromatography (GC) analysis of the headspace.
DOI: 10.15468/dl.6rx2z2
title: Occurrence Download

description: A dataset containing 238485 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Continent is Europe",
 "OccurrenceStatus is Present",
 "TaxonKey is Castor fiber Linnaeus, 1758",
 "Year 2001-2024"
 ]
}

 The dataset includes 238485 records from 497 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027826-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2f18sg2b
title: X-ray fluorescence spectroscopy data on soil samples from Barrow, Alaska, 2013

description: Data is from Barrow soils, sampled at discrete depth-intervals, and subjected to energy-dispersive X-ray fluorescence spectroscopy, using an XEPOS spectrometer. Samples were fine, flour-consistency powders, suspended over a thin membrane of Prolene X-ray film. Data represents means of 4 determinations per sample, with X-ray tube voltage ~ 39 Kilovolts potential.
DOI: 10.18739/a29882n9f
title: X-ray fluorescence spectroscopy data on soil samples from Barrow, Alaska, 2013

description: Data is from Barrow soils, sampled at discrete depth-intervals, and subjected to energy-dispersive X-ray fluorescence spectroscopy, using an XEPOS spectrometer. Samples were fine, flour-consistency powders, suspended over a thin membrane of Prolene X-ray film. Data represents means of 4 determinations per sample, with X-ray tube voltage ~ 39 Kilovolts potential.
DOI: 10.18739/a25h7bv59
title: Soil water samples analyzed for dissolved iron (Fe) and other chemical compounds from several drained thaw lake basins near Barrow, Alaska, 2010

description: Soil water was collected from several drained thaw lake basins near Barrow, Alaska (AK) in 2010. Samples were collected from 0-10 centimeter (cm) depth using Rhizon soil moisture samplers and analyzed for dissolved iron (Fe), organic carbon, siderophores, carbon dioxide and methane (Lipson et al. (2013) Global Biogeochemical Cycles 27:1-11, doi:10.1002/gbc.20038).
DOI: 10.15468/dl.4sqbb5
title: Occurrence Download

description: A dataset containing 543 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is one of (Human Observation, Specimen)",
 "TaxonKey is Humulus lupulus var. cordifolius (Miq.) Maxim."
 ]
}

 The dataset includes 543 records from 45 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027845-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a21r6n203
title: Electrical current measurements from poised electrodes of microbial three-electrode systems from drained thaw lake basins near Barrow, Alaska, 2011-2012

description: 2011: Electrical current measurements from poised electrodes of microbial three-electrode systems from a young, medium, old, and ancient aged drained-thaw lake basins. At each basin there are duplicate measurements at shallow (7 centimeter (cm)), medium (10 cm), and deep (14 cm) depths below the soil surface. All current values are in micro-amperes. 2012: Electrical current measurements from poised electrodes of microbial three-electrode systems from three ice-wedge polygons within a medium aged drained-thaw lake basin. Within each polygon there are duplicate measurements at shallow (6 cm) and deep (10 cm) below the soil surface. All current values are in micro-amperes. See Friedman et al. (2012) Biosensors and Bioelectronics 32: 309-313.
DOI: 10.18739/a2x05xd5d
title: Soil pore water samples analyzed by ion chromatography near Barrow, Alaska, 2011

description: Soil-pore water collected using Rhizon soil water samplers on several replicated transects for each Basin-age class, plus Cornell electrochemistry plots. Samples were refrigerated until analysis, and analyzed by single-column ion chromatography using a DIONEX system, and AS-14 anion-exchange column/pre-column.
DOI: 10.18739/a2s756m1n
title: Reduction of iron and humic substances as a dominant respiratory process in Arctic peat soils, 2008-2012

description: Investigators from San Diego State University, Washington University, and Stanford University will collaborate to study the role of iron and humic substances as electron acceptors in anaerobic respiration in peat soils of drained thaw lake basins in the Arctic. The role of microbial physiology in carbon flux from Arctic soils has substantial implications of climate change, and the PIs will apply novel methods that promise new insights. The study will further our understanding of controls over and seasonal and spatial variability in of carbon fluxes from Arctic soils. The goals are to: (1) determine the specific mechanisms of exocellular electron transfer in Alaskan peat soils, and the microorganisms that mediate these processes, (2) quantify the importance of exocellular electron transfer to soil respiration in Arctic drained thaw lake basins, (3) determine the effects of polygon-induced microtopography on exocellular electron transfer, and (4) determine how age and complexity of soil humic materials along a soil age gradient affect rates of exo-electron transfer, and the conditions under which it occurs. Award number: OPP 0808604 Sponsor: San Diego State University Foundation, 5250 Campanile Drive, San Diego, CA 92182-2190 Award Program: Arctic Natural Sciences (ANS)
DOI: 10.18739/a2ht2gc6g
title: Modeled Bathymetry Maps of 17 Lakes on the Arctic Coastal Plain of Alaska, 2017

description: The goal of this project was to test the application of spectral depth models 
to quantify lake water volumes on the Inner Arctic Coastal Plain of Alaska. Lakes in this area tend to be deeper than those 
nearby and store a significant amount of the region’s water, making them important in terms of energy balance, as ecological 
habitat, and as water sources for infrastructure (e.g. ice roads). Due in part to their depth, these lakes have often been 
neglected by the limited number of prior studies that also focus on lakes in northern Alaska. Techniques employed by these 
studies limit the magnitude, precision, and/or scale at which depths can be assessed. By analyzing remotely sensed lake color 
using a method typically reserved for coastal bathymetry mapping, we are able to predict deeper depths and thus more accurately 
evaluate deep Arctic lake water volumes. This dataset includes 30 meter resolution bathymetry rasters for 17 lakes on the 
Alaskan Arctic Coastal Plain. These depth maps were created using linear and exponential models tuned with sonar depth measurements 
(depth dataset: doi:10.18739/A2SN01440) and applied to a Landsat-8 image (image ID: LC08_L1TP_077011_20160805_20170222_01_TI). 
The 12 model variants we tested were each distinguished by the two Red-Green-Blue (RGB) bands used, linear or exponential growth 
pattern, and simple or transform ratio. We were able to successfully tune models at the scale of an individual lake, predicting 
depth with an average model uncertainty (based on root mean squared error) of 1.44 meters. Volumes derived from the provided 
bathymetry rasters may be useful for understanding the distribution of water across northern Alaska and providing context for 
future changes in the landscape. Models were derived in part from: Stumpf, R. P., Holderied, K., and Sinclair, M. (2003). 
Determination of water depth with high-resolution satellite imagery over variable bottom types. Limnology and Oceanography, 
48(1), 547-606. Sonar depth points provided by: Simpson, C. and Arp, C. (2018). Sonar Depth Measurements at Lakes on the Inner 
Arctic Coastal Plain of Alaska, July 2017. Arctic Data Center. doi:10.18739/A2SN01440 [https://doi.org/10.18739/A2SN01440]
DOI: 10.15468/dl.pcc2bd
title: Occurrence Download

description: A dataset containing 13174081 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Netherlands",
 "OccurrenceStatus is Present",
 "TaxonKey is Tracheophyta",
 "Year 2010-2024"
 ]
}

 The dataset includes 13174081 records from 77 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027828-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15156/bio/sh0201593.10fu
title: SH0201593.10FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.