cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6073/pasta/d93ddafe0eacd6b475a4f21894f2a61a
title: Ecosystem-scale rainfall manipulation in a Pinon-Juniper Woodland: Volumetric Water Content (VWC) Profile Data (2009-2013 )

description: Climate models predict that water limited regions around the world will become drier and warmer in the near future, including southwestern North America. We developed a large-scale experimental system that allows testing of the ecosystem impacts of precipitation changes. Four treatments were applied to 1600 m2 plots (40 m × 40 m), each with three replicates in a piñon pine (Pinus edulis) and juniper (Juniper monosperma) ecosystem. These species have extensive root systems, requiring large-scale manipulation to effectively alter soil water availability. Treatments consisted of: 1) irrigation plots that receive supplemental water additions, 2) drought plots that receive 55% of ambient rainfall, 3) cover-control plots that receive ambient precipitation, but allow determination of treatment infrastructure artifacts, and 4) ambient control plots. Our drought structures effectively reduced soil water potential and volumetric water content compared to the ambient, cover-control, and water addition plots. Drought and cover control plots experienced an average increase in maximum soil and air temperature at ground level of 1-4° C during the growing season compared to ambient plots, and concurrent short-term diurnal increases in maximum air temperature were also observed directly above and below plastic structures. Our drought and irrigation treatments significantly influenced tree predawn water potential, sap-flow, and net photosynthesis, with drought treatment trees exhibiting significant decreases in physiological function compared to ambient and irrigated trees. Supplemental irrigation resulted in a significant increase in both plant water potential and xylem sap-flow compared to trees in the other treatments. This experimental design effectively allows manipulation of plant water stress at the ecosystem scale, permits a wide range of drought conditions, and provides prolonged drought conditions comparable to historical droughts in the past – drought events for which wide-spread mortality in both these species was observed.
DOI: 10.6073/pasta/f4fbe653cd0a2b7bf645675fdc2294fa
title: Ecosystem-scale rainfall manipulation in a Pinon-Juniper woodland: Tree Sapwood and Leaf Area Data (2011)

description: Climate models predict that water limited regions around the world will become drier and warmer in the near future, including southwestern North America. We developed a large-scale experimental system that allows testing of the ecosystem impacts of precipitation changes. Four treatments were applied to 1600 m2 plots (40 m × 40 m), each with three replicates in a piñon pine (Pinus edulis) and juniper (Juniper monosperma) ecosystem. These species have extensive root systems, requiring large-scale manipulation to effectively alter soil water availability. Treatments consisted of: 1) irrigation plots that receive supplemental water additions, 2) drought plots that receive 55% of ambient rainfall, 3) cover-control plots that receive ambient precipitation, but allow determination of treatment infrastructure artifacts, and 4) ambient control plots. Our drought structures effectively reduced soil water potential and volumetric water content compared to the ambient, cover-control, and water addition plots. Drought and cover control plots experienced an average increase in maximum soil and air temperature at ground level of 1-4° C during the growing season compared to ambient plots, and concurrent short-term diurnal increases in maximum air temperature were also observed directly above and below plastic structures. Our drought and irrigation treatments significantly influenced tree predawn water potential, sap-flow, and net photosynthesis, with drought treatment trees exhibiting significant decreases in physiological function compared to ambient and irrigated trees. Supplemental irrigation resulted in a significant increase in both plant water potential and xylem sap-flow compared to trees in the other treatments. This experimental design effectively allows manipulation of plant water stress at the ecosystem scale, permits a wide range of drought conditions, and provides prolonged drought conditions comparable to historical droughts in the past – drought events for which wide-spread mortality in both these species was observed. The focus of this study was to determine the effects of rainfall manipulation on our two target tree species. Therefore, the analysis of the water relations of these trees was an essential component of the project. Sap-flow within each individual target tree was monitored through the use of Granier probes. These monitoring efforts provided a window on processes such as transpiration and the night-time re-filling of the xylem tissue. Drought tolerance and adaptation strategies were also explored by comparing differences in sap-flow rates across treatment types and between species.
DOI: 10.6073/pasta/72e87ec43be131a9be28c2dbfddae29c
title: Ecosystem-Scale Rainfall Manipulation in a Piñon-Juniper Forest at the Sevilleta National Wildlife Refuge, New Mexico: Meteorological Data (2006-2013 )

description: Climate models predict that water limited regions around the world will become drier and warmer in the near future, including southwestern North America. We developed a large-scale experimental system that allows testing of the ecosystem impacts of precipitation changes. Four treatments were applied to 1600 m2 plots (40 m × 40 m), each with three replicates in a piñon pine (Pinus edulis) and juniper (Juniper monosperma) ecosystem. These species have extensive root systems, requiring large-scale manipulation to effectively alter soil water availability. Treatments consisted of: 1) irrigation plots that receive supplemental water additions, 2) drought plots that receive 55% of ambient rainfall, 3) cover-control plots that receive ambient precipitation, but allow determination of treatment infrastructure artifacts, and 4) ambient control plots. Our drought structures effectively reduced soil water potential and volumetric water content compared to the ambient, cover-control, and water addition plots. Drought and cover control plots experienced an average increase in maximum soil and air temperature at ground level of 1-4° C during the growing season compared to ambient plots, and concurrent short-term diurnal increases in maximum air temperature were also observed directly above and below plastic structures. Our drought and irrigation treatments significantly influenced tree predawn water potential, sap-flow, and net photosynthesis, with drought treatment trees exhibiting significant decreases in physiological function compared to ambient and irrigated trees. Supplemental irrigation resulted in a significant increase in both plant water potential and xylem sap-flow compared to trees in the other treatments. This experimental design effectively allows manipulation of plant water stress at the ecosystem scale, permits a wide range of drought conditions, and provides prolonged drought conditions comparable to historical droughts in the past – drought events for which wide-spread mortality in both these species was observed.A micrometeorological station was used to document the climatic conditions at the study site. Monitoring the ambient environment in this way allowed us to more easily determine which tree growth responses were driven by changes in the native climate as opposed to those resulting from the rainfall manipulation treatments. Environmental factors such as temperature, relative humidity, and photosynthetically active radiation (PAR) have a huge impact on the physiological processes that are being explored in this project. The data collected by the station created a local climatic record which was needed to provide the context in which the treatment effects can be examined and sensor readings can be interpreted.
DOI: 10.6073/pasta/9c98a14a492c23f32685fb56f13acc0a
title: MCR LTER: Coral Reef: Long-term Population and Community Dynamics: Fishes

description: These data describe the species abundance and size distributions of fishes surveyed as part of MCR LTER's annual reef fish monitoring program. This study began in 2005 and the dataset is updated annually. The abundances of all mobile taxa of fishes (Scarids, Labrids, Acanthurids, Serranids, etc.) observed on a five by fifty meter transect which extends from the bottom to the surface of the water column are recorded by a diver using SCUBA. The diver then swims back along a one by fifty meter section of the original transect line and records the abundances of all non-mobile or cryptic taxa of fishes (Pomacentids, Gobiids, Cirrhitids, Holocentrids etc). Surveys are conducted between 0900 and 1600 hours (Moorea time) during late July or early August each year. In 2006, divers also began to estimate the size (length) of each fish observed to the nearest half cm. Four replicate transects are surveyed in each of six locations on the forereef (two on each of Moorea's three sides), six locations on the backreef (two on each of Moorea's three sides) and on six locations on the fringing reef (two on each of Moorea's three sides) for a total of 72 individual transects. Transects are permanently marked using a series of small, stainless steel posts affixed to the reef. Transects on the forereef are located at a depth of approximately 12m, those on the backreef are located at a depth of approximately 1.5m and those on the fringing reef are located at a depth of approximately 10m. In addition to the biotic data collected, divers also record data on the date and time each transect was surveyed, wind speed and sea state, swell height in m, amount of cloud cover in % and horizontal visability in m. This monitoring program is consistent with the protocols adopted by the Global Coral Reef Monitoring Network and the Australian Institute of Marine Science for use with the Great Barrier Reef Long-term Monitoring Program.
DOI: 10.6073/pasta/63721efeb3db2bfc4dbf6a72cf564d46
title: MCR LTER: Coral Reef: Long-term Population Dynamics of Acanthaster planci, ongoing since 2005

description: These data describe the abundance of Acanthaster planci, Crown of Thorns Sea stars, surveyed as part of MCR LTER's annual reef fish monitoring program. This study began in 2005 and the dataset is updated annually. The abundances of A. planci observed on a five by fifty meter transect are recorded by a diver using SCUBA. Surveys are conducted between 0900 and 1600 hours (Moorea time) during late July or early August each year. Four replicate transects are surveyed in each of three habitats (forereef, backreef and fringing reef) at six locations, two on each of Moorea's three sides, on the forereef, six locations on the backreef (two on each of Moorea's three sides for a total of 72 individual transects. Transects are permanently marked using a series of small, stainless steel posts affixed to the reef. Transects on the forereef are located at a depth of approximately 12m, those on the backreef are located at a depth of approximately 1.5m and those on the fringing reef are located at a depth of approximately 10m. This monitoring program is consistent with the protocols adopted by the Global Coral Reef Monitoring Network and the Australian Institute of Marine Science for use with the Great Barrier Reef Long-term Monitoring Program. These data from years 2005-2010 were published in: Adam, T.C., R.J. Schmitt, S.J. Holbrook, A.J. Brooks, P.J. Edmunds, R.C. Carpenter and G. Bernardi. 2011. Herbivory, connectivity and ecosystem resilience: response of a coral reef to a large-scale perturbation. PLoS One 6(8): e23717 DOI: 10.1371/journal.pone.0023717
DOI: 10.6073/pasta/a015f5d003134ca6e688091e4082e81e
title: MCR LTER: Coral Reef: Long-term Community Dynamics: Backreef (Lagoon) Corals Annual Survey, ongoing since 2005

description: This dataset contains the percentage cover of all stony corals (Scleractinia, pooled among genera) and other major groups analyzed from 0.5 x 0.5 m photographic quadrats at the Backreef habitat at the Moorea Coral Reef LTER, French Polynesia. This survey time series began in 2005 and is repeated each year in April. Functional groups counted are: Scleractinian corals, Macroalgae, Crustose Coralline Algae / Bare Space, Soft Corals, Hydrocorals (Millepora), Algal Turf and Sand. The coral community was sampled photographically in all represented habitats surrounding the island: Fringing Reef, Lagoon, and Outer Reef. This dataset contains only Lagoon (Backreef) data (see knb-lter-mcr.4 for the other habitats) and is structured in a repeated-measures protocol to allow a statistical contrast of sites, shores and times. Community structure was determined through a coarse analysis of the benthic community, initially completed in situ (2005), but using photoquadrats from 2006. There are quadrats analyzed at each of five areas within each site, and the areas are revisited (but not the quadrats) each year to support the repeated measures design. There are two tables available, providing different views of the same data: a long table having all values in one column and a wide table having a separate column for each observed object. Detailed methods are available in the protocols section.
DOI: 10.6073/pasta/ef745c1a7e83a746e39a05346731e407
title: Effects of permafrost thaw on nitrogen availability and plant-soil interactions in a boreal Alaskan lowland: II - Nitrogen Data 2013

description: This dataset examines shifts in extractable soil pore water chemistry along a lowland boreal permafrost thaw chronosequence. Data was collected in 2013 at the APEX Beta and forested study plots, located adjacent to the BNZ experimental forest. Measured parameters include: dissolved inorganic N (DIN), dissolved organic N (DON), free amino acids, total dissolved N (TDN), soil temp. at 10 cm, seasonal ice depth, and volumetric soil moisture at 10 cm. Soil pore water samples and environmental variables were collected every three to four weeks from late June to late September, 2013 for a total of five sampling events.
DOI: 10.6073/pasta/55a2b554347fdf76cb8be82d31bf7c72
title: Effects of permafrost thaw on nitrogen availability and plant-soil interactions in a boreal Alaskan lowland: III - Root Abundance 2013

description: This dataset examines shifts in rooting along a lowland boreal permafrost thaw chronosequence. Data was collected in 2013 at the APEX Beta and forested study plots, located adjacent to the BNZ experimental forest.
DOI: 10.6073/pasta/aed4e22fc766b9dda5bec6b3f7c97b2b
title: Effects of permafrost thaw on nitrogen availability and plant-soil interactions in a boreal Alaskan lowland: IV - Plant vs Nitrogen Data 2013

description: This dataset examines shifts in soil and plant characteristics, and extractable soil pore water chemistry along a lowland boreal permafrost thaw chronosequence. Data was collected in 2013 at the APEX Beta and forested study plots, located adjacent to the BNZ experimental forest. Data includes mean DIN, DON, free amino acids, and TDN from seasonal pore water measurements as well as aboveground vegetation C and N concentrations, and summertime, litterfall % N, and resorption efficiency for C. calyculata.
DOI: 10.6073/pasta/318543ce17386618a69d869084c14677
title: Effects of permafrost thaw on nitrogen availability and plant-soil interactions in a boreal Alaskan lowland: V - Isotape Data 2013

description: This dataset examines shifts in foliar del N 15 concentations for three plant species found across a lowland boreal permafrost thaw chronosequence. Data was collected in 2013 at the APEX Beta and forested study plots, located adjacent to the BNZ experimental forest.
DOI: 10.5066/f7g73czm
title: Data for Use in poscrptR Post-fire Conifer Regeneration Prediction Model

description: These data support poscrptR (Wright et al. 2021). poscrptR is a shiny app that predicts the probability of post-fire conifer regeneration for fire data supplied by the user. The predictive model was fit using presence/absence data collected in 4.4m radius plots (60 square meters). Please refer to Stewart et al. (2020) for more details concerning field data collection, the model fitting process, and limitations. Learn more about shiny apps at https://shiny.rstudio.com. The app is designed to simplify the process of predicting post-fire conifer regeneration under different precipitation and seed production scenarios. The app requires the user to upload two input data sets: 1. a raster of Relativized differenced Normalized Burn Ratio (RdNBR), and 2. a .zip folder containing a fire perimeter shapefile. The app was designed to use Rapid Assessment of Vegetative Condition (RAVG) data inputs. The RAVG website (https://fsapps.nwcg.gov/ravg) has both RdNBR and fire perimeter data sets available for all fires with at least 1,000 acres of National Forest land from 2007 to the present. The fire perimeter must be a zipped shapefile (.zip file, include all shapefile components: .cpg, .dbf, .prj, .sbn, .sbx, .shp, and .shx). RdNBR must be 30m resolution, and both the RdNBR and fire perimeter must use the USA Contiguous Albers Equal Area Conic coordinate reference system (USGS version). RDNBR must be alligned (same origin) as RAVG raster data. References: Stewart, J., van Mantgem, P., Young, D., Shive, K., Preisler, H., Das, A., Stephenson, N., Keeley, J., Safford, H., Welch, K., Thorne, J., 2020. Effects of postfire climate and seed availability on postfire conifer regeneration. Ecological Applications. Wright, M.C., Stewart, J.E., van Mantgem, P.J., Young, D.J., Shive, K.L., Preisler, H.K., Das, A.J., Stephenson, N.L., Keeley, J.E., Safford, H.D., Welch, K.R., and Thorne, J.H. 2021. poscrptR. R package version 0.1.3.
DOI: 10.6073/pasta/52db341ca154d907e2a82a7ae84c9be2
title: Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER. Summer 1983 to 1989.

description: Decadal file describing the physical lake parameters recorded at various lakes near Toolik Research Station during summers from 1983 to 1989. Depth profiles at the sites of physical measures were collected in situ. Values measured included temperature, conductivity, pH, dissolved oxygen, Chlorophyll A, Secchi disk depth and PAR. Note that some sample depths also have additional parameters measured and available in separate files for water chemistry and primary production.
DOI: 10.6073/pasta/4d37166727c18052bc444ca5c7bb398c
title: Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER. Summer 1990 to 1999

description: Decadal file describing the physical/chemical values recorded at various lakes near Toolik Research Station during summers from 1990 to 1999. Sample site descriptors include site, date, time, depth. Depth profiles of physical measures collected in situ with Hydrolab Datasonde in the field include temperature, conductivity, pH, dissolved oxygen in both percent saturation and mg/l, SCUFA chlorophyll-a values in both volts and µg/l, and PAR.
DOI: 10.6073/pasta/dd1d7302ec6268bba52d1c76540932ec
title: Hourly weather data from the Arctic LTER Moist Acidic Tussock Experimental plots from 2000 to 2010, Toolik Filed Station, North Slope, Alaska.

description: Hourly weather and soil temperature data from the LTER Moist AcidicTussock Experimental plots. In 1990 a Campbell CR21x data logger was installed in block 2 of the Toolik LTER experimental moist acidic tussock plots. The plots are located on a hillside near Toolik Lake (68 38' N, 149 36'W). Sensors were placed in control, fertilized, greenhouse, greenhouse fertilized, shade house and shade house fertilized sites.
DOI: 10.6073/pasta/07b042676a052d5e6b52f50bbcc65849
title: Biomass, nitrogen and carbon of plants in the Arctic LTER experimental wet sedge tundra experimental sites, 2001, Toolik Lake, Alaska.

description: Biomass, nitrogen and carbon of plants in the Arctic LTER experimental wet sedge tundra experimental sites, 2001, Toolik Lake, Alaska.. Treatments at each site included factorial NxP, greenhouse and shade house and were begun in 1985 (Sag site) or in 1988 (Toolik sites).
DOI: 10.6073/pasta/e7c2be020f700c6452554f56e23bcdb4
title: Late season thaw depth measured in the ARC LTER moist acidic tussock experimental plots at Toolik Field station, AK Arctci LTER 1993 to current year.

description: Late season thaw depth was measured in the ARC LTER experimental plots (Moist Acidic Tussock, Moist Non-acidicTussock, Moist Non-acidic Non-tussock, Wet Sedge) at Toolik Lake, AK using a thaw probe.
DOI: 10.6073/pasta/012de0cf7d1f00951b7289037a3a4c19
title: Chlorophyll and phaeopigments from water column samples, collected at selected depths at Palmer Station Antarctica, during Palmer LTER field seasons, 1991 - 2015.

description: Chlorophyll and phaeopigment from extracted fluorescence analysis of discrete bottle samples collected by zodiac. Each station 1-2 times per week although the schedule can be severely impacted by weather. One sample from each Go-Flo bottle at six depths. Water was taken from Go-Flo bottles deployed off a Zodiac. Chlorophyll analysis done at Palmer station.
DOI: 10.6073/pasta/a69864292c4499ee5587d53491796ff2
title: Average monthly sea ice coverage for the PAL LTER region West of the Antarctic Peninsula derived from passive microwave, 1978 - present.

description: Monthly sea ice coverage derived from passive microwave satellite measurements. Ice extent is defined as the area bounded by the 15% ice concentration contour which is determined by summing up all the pixel areas (nominally 25km by 25km) which have concentrations greater than 15%. Sea-ice extent refers to the total surface area inside the ice-edge. This area inside the ice-edge is not necessarily covered by 100%.
DOI: 10.6073/pasta/5038a45eba2f436f14e14dc5da15d090
title: Photosynthetic pigments of water column samples analyzed using High Performance Liquid Chromatography (HPLC), sampled during Palmer LTER field season at Palmer Station Antarctica, 1991 - 2009.

description: Samples were taken from Go-Flo bottles deployed from a zodiac in the Palmer LTER inshore grid region and analyzed with HPLC for pigments. Water is sampled at all stations, from Go-Flo bottles tripped at the surface, and bottles tripped at depths corresponding to 50, 25, 10, 5, and 0.5 percent of measured surface PAR. Water sampled from Go-Flo bottles, which corresponded to light levels used in primary productivity simulated in situ experiments.
DOI: 10.5281/zenodo.4771118
title: X-ray diffraction images for Clostridium difficile L-threonine dehydrogenase.

description: X-ray diffraction images collected from crystals of threonine dehydrogenase from C. difficile (delta 630) at a temperature of 100 K at Diamond Light Source (DLS) beamline I04-1 using a PILATUS 2M detector and a wavelength of 0.92 Å. A total of 190 degrees of data were collected using a rotation range of 1 degree and an exposure time of 4 seconds per image.
description: {"references": ["Eyram Adjogatse, Josh Bennett, Jingxu Guo, Peter T. Erskine, Steve P. Wood, Brendan W. Wren and Jonathan Bartholomew Cooper. (2021) The X-ray structure of L-threonine dehydrogenase from the common hospital pathogen Clostridium difficile. Acta Crystallographica F77, 269-274. DOI: 10.1107/S2053230X21007135"]}
DOI: 10.5281/zenodo.4771117
title: X-ray diffraction images for Clostridium difficile L-threonine dehydrogenase.

description: X-ray diffraction images collected from crystals of threonine dehydrogenase from C. difficile (delta 630) at a temperature of 100 K at Diamond Light Source (DLS) beamline I04-1 using a PILATUS 2M detector and a wavelength of 0.92 Å. A total of 190 degrees of data were collected using a rotation range of 1 degree and an exposure time of 4 seconds per image.
description: {"references": ["Eyram Adjogatse, Josh Bennett, Jingxu Guo, Peter T. Erskine, Steve P. Wood, Brendan W. Wren and Jonathan Bartholomew Cooper. (2021) The X-ray structure of L-threonine dehydrogenase from the common hospital pathogen Clostridium difficile. Acta Crystallographica F77, 269-274. DOI: 10.1107/S2053230X21007135"]}