cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.15468/wzudei
title: Two new species of the genus Reticuluma Cheng & Li (Hemiptera: Cicadellidae Deltocephalinae: Penthimiini) from China

description: This dataset contains the digitized treatments in Plazi based on the original journal article Wang, Dongming, Zhang, Yalin (2019): Two new species of the genus Reticuluma Cheng & Li (Hemiptera: Cicadellidae Deltocephalinae: Penthimiini) from China. Zootaxa 4668 (2): 289-295, DOI: https://doi.org/10.11646/zootaxa.4668.2.10
DOI: 10.18739/a20g3gz2f
title: Nordenskioldland, Svalbard Reindeer Carbon and Nitrogen Isotope Data

description: Whether carbon and nitrogen stable isotope analysis (δ13C and δ15N) can resolve herbivore diets across fine spatial scales is particularly unclear in the rapidly changing Arctic. Here, we used stable isotope analysis to assess fine-scale summer dietary differences of Rangifer tarandus platyrhynchus (non-migratory reindeer) in Nordenskioldland, Svalbard. We sampled reindeer hair from Colesdalen and Sassendalen systems between 1994 and 2006 and again in 2012. In linear regression models, current and last years July temperature significantly and positively correlated with δ13C and δ15N of Svalbard reindeer, with July precipitation also being positively correlated to reindeer δ15N. δ13C and δ15N analyses could record annual changes in herbivore diet among valleys separated by less than 50 km. Reindeer from inner valleys within a system were enriched in 13C and depleted in 15N compared to outer valleys. Bayesian mixing model results indicated 10% greater consumption of graminoids in Colesdalen than in Sassendalen. Such spatial variation in diet suggest high site fidelity and localized differences in forage availability. These results probably reflect the earlier growing season onset in Colesdalen and outer valleys than in Sassendalen and inner valleys. Isotopic and MODIS remote sensing data suggested an early-season switch from moss to graminoid dependence in these valleys. Our results illustrated the importance of collecting food sources concurrently with herbivore tissue growth and emphasized the value of using local, time-overlapping source data when modeling diets in the Arctic. Additionally, our analyses quantified an increase in 13C discrimination with rising atmospheric pCO2 and falling atmospheric δ13CO2 and quantified how hair C:N and reindeer age class (e.g. calf versus adult) influence δ13C and δ15N patterns. These data illustrate the ability of δ13C and δ15N to detect subtle temporal and spatial dietary differences and provide evidence that isotopic studies can monitor dietary shifts in the changing Arctic.
DOI: 10.18739/a24746r6k
title: Sediment core data related to the extinction of Mammuthus primigenius, St. Paul Island, Alaska, 2014

description: This project will provide new data on the paleoclimates, paleoenviroments and the biodiversity impacts of sea level rise on the southern edge of the Bering Land Bridge (BLB), and is intended to facilitate a better understanding of why woolly mammoths survived late into the mid-Holocene only in the environments of Arctic islands of this area. Furthermore, this research will attempt to establish the actual time of extinction of the Holocene mammoth population on St. Paul Island, Pribilof Islands, Alaska, and apply this information to test various proposed causal hypotheses for the extinction. Relict woolly mammoth (Mammuthus primigenius) populations survived on several small Beringian islands for thousands of years after mainland populations went extinct. Here, we present new multi-proxy paleoenvironmental records to investigate the timing, causes, and consequences of mammoth disappearance from St. Paul Island, Alaska, USA. These proxies include pollen, spores, cladocerans, diatoms, oxygen isotopes, C:N, MS, 14C data, tephra, LOI and aDNA.
DOI: 10.18739/a2cn6z02z
title: Climate and Flux Data from Alaska Sites, 1998-2000

description: This data set contains climate, flux, and bulk density data from Ivotuk and Council (Seward Peninsula), Alaska, collected from 1998 through 2000. Surface energy and trace gas exchange measurements were made at each of the four Ivotuk sites using the eddy covariance technique. Three flux and climate towers operated at Council, Seward Peninsula, during 1999 and 2000. Two towers were located at the tundra and forest sites. The third tower was a mobile tower and during 1999 covered four different surface types: lowshrub, shrub, woodland, and burned tundra. During 2000, the mobile tower covered tall shrub, tundra ISS2, burned tundra, heath and shallow thaw lake. The data have been divided by surface type or site and by data type (flux or climate). The data set also includes mean bulk density measurements for soil layers, collected in 1999. Measurements were taken as part of the Land-Atmosphere-Ice Interactions Arctic Transitions in the Land-Atmosphere System (LAII-ATLAS) program. The research project was funded by the Arctic System Sciences (ARCSS) Program, grant number OPP-9818066.
DOI: 10.18739/a2hd7ns6p
title: Dissolved organic carbon and fluorescent dissolved organic matter in the Arctic Ocean (August-October 2015)

description: The samples and data presented were collected aboard the United States Coast Guard Cutter (USCGC) Healy and the Research Vessel (RV) Polarstern in the summer-fall of 2015 during the Arctic GEOTRACES program. The USCGC Healy sailed from Dutch Harbor through Bering Strait along a western leg (~180 W) across the Makarov Basin to the North Pole returning south along an eastern leg (~150 W) during August 9–October 12. The RV Polarstern sailed across the Barents Sea, over the Gakkel Ridge and into the Makarov Basin and back (August 17-October 14). She rendezvoused with the USCGC Healy at the North Pole on September 7, and the two ships conducted an inter-calibration at the North Pole. Water samples were collected from CTD/rosette bottle casts for the characterization of dissolved organic matter presented in this report.
DOI: 10.18739/a2n58ck9b
title: Aerosol and chemical measurements from ice cores, Summit, Greenland, 1446-1763

description: The main research goal of this project was to provide the first reliable record of pre-industrial carbon monoxide concentration ([CO]) and stable isotopes (δ13CO and δ18CO) in the Arctic atmosphere which is representative of a large part of the Northern Hemisphere (NH). Two large diameter ice cores were collected near Summit, Greenland. The deeper core drilled near the old EUROCORE site provides ice from 80 to 170 m depth (air age from ~1960 to ~1640 AD). A second, shallower core drilled near Summit Station provides ice from 80 to 98 m depth (air age from ~1890 to ~1960). Continuous analyses of trace chemistry were used to establish the ice core chronology and improve understanding of mechanisms of in situ CO production in ice.
DOI: 10.15468/vngbs8
title: Redescription of Astyanax gymnogenys Eigenmann, 1911 (Characiformes Characidae), a senior synonym of Astyanax longirhinus Garavello & Sampaio 2010

description: This dataset contains the digitized treatments in Plazi based on the original journal article Oliveira, Carlos Alexandre Miranda, Bertaco, Vinícius Araújo, Graça, Weferson Júnio Da, Pavanelli, Carla Simone (2019): Redescription of Astyanax gymnogenys Eigenmann, 1911 (Characiformes Characidae), a senior synonym of Astyanax longirhinus Garavello & Sampaio 2010. Zootaxa 4668 (2): 229-244, DOI: https://doi.org/10.11646/zootaxa.4668.2.4
DOI: 10.18739/a2qz22h33
title: Sediment cores from Younger Dryas cold epoch, United States Coast Guard Cutter (USCGC) Healy cruise, Eastern Beaufort Sea, Arctic Ocean, 2013

description: This NSF funded project was dedicated to testing the idea that the Younger Dryas cold epoch (~13,000 to ~12700 years Before Present) was caused by a massive flood of fresh water via Mackenzie River to the eastern Beaufort Sea. It was noted in a 1975 paper in Science by Kennett and Shackleton that the flood of fresh water down Mississippi River was interrupted at about 13 kilo annums (ka), even though there was no reason to suspect a pause in glacial ice melt. The Kennett and Shackleton hypothesis led to the expectation that as glacial ice continued to melt and retreat northward, at some point eastern outlets for meltwater must have opened to the St. Lawrence system around the time the Mississippi flood ended. However, researchers looked for decades for the signal of low δ18O in planktonic foraminifera off eastern Canada, to no avail. The only other logical direction for meltwater would have been to the north through Mackenzie River. Two piston cores recovered during USCGC Healy Cruise 2013 near Mackenzie River have the low δ18O signal of the flood beginning at 12.9 ka according to radiocarbon dating. Those flood waters most likely reduced the surface ocean salinity in the Nordic Seas, reducing the production of deep water, and thereby reducing the northward the flux of warm salty waters that account for the temperate climate in northern Europe today. This flood was most likely the trigger for the younger Dryas cooling. Analytical data associated with this project, and especially those data published in Keigwin et al. (2018, "Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling," Nature Geoscience, dos/10.1038/s41561-018-0169-6), can be found in the NOAA WDS paleoclimatology database (https://www.ncdc.noaa.gov/paleo/study/24790). Those data are mostly the metadata, the chronology, and the stable isotope results. The metadata are repeated here. Supplementary information to Keigwin et al. 2018 may be found at the Nature Geoscience url shown above. Underway geophysical data can be found here: doi.org/10.18739/A2FB4WK7X.
DOI: 10.18739/a2vq2s97v
title: Chukchi and Bering Sea surface water particulate organic matter distributions (summer/fall 2012, 2015, 2016, 2017)

description: The samples and data presented were collected during four separate cruises aboard three different research vessels, including United States Coast Guard Cutter (USCGC) Healy, National Oceanographic and Atmospheric Administration (NOAA) Research Vessel Ronald H. Brown and University-National Oceanographic Laboratory System (UNOLS) Research Vessel Sikuliaq, operated by University of Alaska-Fairbanks. The USCGC Healy cruise (HLY1203) sailed from Dutch Harbor to Dutch Harbor (AK) from October 5 to 25, 2012. The Ronald H. Brown cruise (RB1505) sailed from Kodiak (AK) to Dutch Harbor (AK) from August 6 to September 4, 2015. The RV Sikuliaq cruise in 2016 included a transit leg (SKQ201611T) from Seward (AK) to Nome (AK) from August 26 to 31, 2016 and a science leg (SKQ201612S) from Nome to Nome from September 3 to 25, 2016. In 2017, the RV Sikuliaq cruise included a transit leg (SKQ201711T) that sailed from Seward to Nome from August 1 to August 5, 2017 and a science leg (SQK201712S) from August 7 to 21, 2017. For the two Sikuliaq cruises, we have combined the data from each transit and science legs and will refer to those data sets as SKQ2016 and SQK2017, respectively. All surface underway data (date and time, latitude, longitude, salinity, temperature, POC and PN concentrations) are presented.
DOI: 10.15468/6sexnx
title: Paraschistura makranensis, a new loach from the Jegin River drainage in southern Iran with comments on P. ilamensis and P. pasatigris (Teleostei: Nemacheilidae)

description: This dataset contains the digitized treatments in Plazi based on the original journal article Eagderi, Soheil, Mousavi-Sabet, Hamed, Freyhof, Jörg (2019): Paraschistura makranensis, a new loach from the Jegin River drainage in southern Iran with comments on P. ilamensis and P. pasatigris (Teleostei: Nemacheilidae). Zootaxa 4668 (2): 258-270, DOI: https://doi.org/10.11646/zootaxa.4668.2.6
DOI: 10.15468/j2q32a
title: Systematic position of Ascopus Marshall, Oreosecus Marshall, Perarogula Hoffmann and Rhadinocopes Hustache (Coleoptera: Curculionidae: Entiminae) with description of a new species of Ascopus from Guinea

description: This dataset contains the digitized treatments in Plazi based on the original journal article Borovec, Roman, Perrin, Hélène (2019): Systematic position of Ascopus Marshall, Oreosecus Marshall, Perarogula Hoffmann and Rhadinocopes Hustache (Coleoptera: Curculionidae: Entiminae) with description of a new species of Ascopus from Guinea. Zootaxa 4668 (2): 245-257, DOI: https://doi.org/10.11646/zootaxa.4668.2.5
DOI: 10.15468/mmkpew
title: Eustra yinggelingensis sp. nov., a new flanged bombardier beetle from Yinggeling Nature Reserve, Hainan, China with contribution to the knowledge of Chinese Eustra species (Coleoptera, Carabidae, Paussinae)

description: This dataset contains the digitized treatments in Plazi based on the original journal article Jiang, Ri-Xin, Wang, Cheng-Bin, Mi, Hong-Xu, Wang, Shuo (2019): Eustra yinggelingensis sp. nov., a new flanged bombardier beetle from Yinggeling Nature Reserve, Hainan, China with contribution to the knowledge of Chinese Eustra species (Coleoptera, Carabidae, Paussinae). Zootaxa 4668 (2): 271-276, DOI: https://doi.org/10.11646/zootaxa.4668.2.7
DOI: 10.25345/c5vm1v
title: MassIVE MSV000084349 - GNPS_GC_beer_aging_test_dataset
title: A time course series of samples was prepared by artificially accelerating aging with storage at elevated temperature for various lengths of time. The samples were analyzed using headspace solid-phase micro-extraction (HS-SPME).
DOI: 10.18739/a23775v6b
title: Niagara Creek Stream Discharge Data, Alaska, 1999-2002

description: This dataset contains stream flow data from Niagara Creek on the Seward Peninsula in Alaska. The stream discharge was monitored several times a day during snowmelt and periodically after snowmelt until late summer by taking individual measurements using a Flowmate current meter and a wading rod. Data are provided in comma delimited ASCII text files separated by year and Excel spreadsheets.
DOI: 10.18739/a2707wp0q
title: Pollen and spore counts, Lake Villaluenga, Alaska, 2016

description: The eastern coastline of the Gulf of Alaska may have been part of the Northwest Coast Route for human dispersal into lower latitude North America at the end of the last ice age. As part of a study aimed at describing the paleoenvironments of the Northwest Coast Route, we retrieved several sediment cores from a small lake near Cape Spencer that we informally call Laguna Villaluenga. The lake lies 3-4 m above present high tide line and is dammed behind a bedrock, glacially-scoured threshold. The remains of marine shells in the lower parts of the core indicate that marine waters filled the basin until ca. 14 cal ka BP (14,000 calendar years before AD 1950). Rapid accumulation of glaciogenic sediment ceased after the basin became isolated from the sea. The pollen data included here spans the period between ca. 14 cal ka BP and 6 cal ka BP.
DOI: 10.18739/a2br8mg4j
title: Radiocarbon dates, nitrogen, and carbon stable isotope data for various Equid bones collected in Alaska, 2015-2019

description: This data package is associated with the NSF Award # 1417036. Collaborative Research: Land Bridges, Ice-Free Corridors, and Biome Shifts: Impacts on the Evolution and Extinction of Horses in Ice-Age Beringia. This study asks: How important was connectivity among populations of large arctic mammal species for maintaining genetic diversity, influencing evolutionary change, and mitigating extinction risk? What types of barriers affected this connectivity, and how permeable were these barriers to gene flow? This study looks into how caballine horses, that inhabited ice-age Beringia (the biogeographic connector between Asia and North America), were affected by changes involving three different biogeographic barriers/corridors (1. the Bering Strait/Bering Land Bridge, which controlled dispersal and gene flow between Eurasia and Alaska; 2. the Ice-Free Corridor, which controlled gene flow between the Yukon and the Lower 48 States; and 3. biome shifts that periodically disrupted the spatial continuity of the Mammoth-Steppe, the unique ecosystem that stretched from France to the Yukon during the ice ages) during the last 30,000 years of the ice age. The specimens are currently in the Earth Sciences Collection at the University of Alaska Fairbanks Museum and are being curated by Pamela Groves and Daniel H. Mann. Each bone was sub-sampled for ancient DNA extraction, and sub-samples are currently in the collection of Paleogenomics lab UC Santa Cruz, curated by Alisa Vershinina.
DOI: 10.18739/a2m61bq0r
title: Ivotuk Flux Data - MNT Site (ASCII) [Beringer, J.]

description: This dataset includes flux data from the MNT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was operated continuously over the growing season whilst the remaining sites were characterized by a single tower that was moved from site to site. The MAT site is therefore used as a reference. This dataset is available in both ASCII and EXCEL formats - For data browsing, we suggest ordering the EXCEL version and using EXCEL to plot the data. NOTE: This dataset contains the data in ASCII format.
DOI: 10.18739/a2fj29c9g
title: Beaufort Sea methane data, 2015

description: Seawater samples were collected in the US Beaufort Sea aboard the R/V Ukpik from 30 August to 5 September, 2015. These measurements were used to help constrain the source of methane to these waters, and by extension, the atmosphere. These seawater samples were prepared and analyzed for the dissolved concentration of methane [CH4], the stable carbon isotopes of methane (δ13C-CH4), and the natural radiocarbon content of methane (14C-CH4). New techniques were used to prepare the samples for the stable and radiocarbon isotopes of methane (Sparrow and Kessler, Limnology & Oceanography: Methods, 2017) and previously published techniques were used to determine dissolved methane concentration (Weinstein et al., Geochem. Geophys. Geosyst., 2016). The 14C-CH4 content and conventional 14C age uncertainty incorporates the collection, preparation, and measurement uncertainties. The δ13C-CH4 uncertainty is the measurement uncertainty associated with isotope ratio mass spectrometer or the cavity-ringdown spectrometer. The [CH4] uncertainty is 5.2% of the measurement.
DOI: 10.18739/a2pz51m4b
title: Meteorology, soil temperature and moisture of Jarvis Creek watershed, Interior Alaska, 2011-2016

description: The overall project assessed the linkages and controls of a subarctic glacier-permafrost hydrological system from a watershed-scale perspective using field measurements, remote sensing and numerical modeling. Jarvis Creek (634km²), which feeds the Delta and Tanana River in Interior Alaska, was studied as a proxy of the observed mountain glacier melting and permafrost degradation that has been documented across the Arctic region in recent decades. The specific objectives were to 1) assess the hydrologic fluxes (including streamflow source components), stores, pathways and the role of glacier wastage on watershed hydrology, through hydrologic and geochemical field measurements as well as numerical and statistical modeling; 2) quantify the effect of glaciers and permafrost on recent historical (1960-present) hydrologic fluxes and storage by combining remote sensing, field measurements of glacier mass balance, and hydrology with a heat- and mass transfer model, and 3) project the future hydrologic regime using custom-derived downscaled climate projections. The purpose of this dataset was to quantify the spatial and temporal variability in meteorology and soils from the lowland (572 m.a.s.l.) to the mountains (1746 m.a.s.l.) across a 6 year time period. Hourly measurements include air temperature, relative humidity, wind speed, incoming solar radiation, rainfall and snow depth. Measurement depths of soil temperature and moisture were at &lt;1.5 and &lt;0.5 m depth, respectively. The meteorology, soil temperature and moisture dataset informed assessments of watershed hydrology.
DOI: 10.18739/a2tq5rd7m
title: Spatial extent of Greenland firn aquifer detected by airborne radars, 2010-2014

description: Mass loss of the Greenland ice sheet has been accelerating since the 1990s, and in recent years (2009‐2012), about 85% of its rate of increase were due to increased surface melt and subsequent runoff. The Greenland surface melt extent and duration have increased over the last decade, in response to increased advection of warm air from the south during summers. Surface melt is not only occurring in the lower elevation margins of the ice sheet but also migrating toward the ice sheet interior, causing a reduction of the dry-snow zone and an expansion of the percolation zone. Widespread firn aquifers have been detected in high-accumulation regions of the ice-sheet percolation zone. In these regions, firn aquifers retain water for at least several years, storing a substantial amount of water responsible of heating the firn and delaying meltwater runoff. Their impacts on the ice sheet are numerous, including firn densification, alteration of the ice thermal state, and water input from the aquifer into the englacial hydrology system, which has the potential to affect ice dynamics and Greenland's contribution to sea level rise. This dataset provides the locations of firn aquifers for the high snow-accumulation regions of the Greenland ice sheet. To achieve this goal, we use NASA Operation IceBridge Accumulation Radar data from five campaigns (2010-2014) and pick the brighter reflection horizons in the firn which are due to strong dielectric contrasts created by the presence of water. For estimating a total firn-aquifer extent, we delineate polygons around flightlines showing water-saturated firn for the 2010-2014 period combined. With this method, we find a 21,900 km2 total extent and an average depth to the water table of 22 m. In addition of providing the firn aquifer extents map by the mean of polygons, we also provide yearly files with firn-aquifer coordinates and depth to the water table. This way, the interannual variability can be investigated in places with repeat flightlines for the 2010-2014 time period.
DOI: 10.18739/a2zg6g71c
title: Benthic macroinfaunal samples collected from the Canadian Coast Guard Ship (CCGS) Sir Wilfrid Laurier, Northern Bering Sea to Chukchi Sea, 2014

description: The Pacific sector of the Arctic Ocean is experiencing major reductions in seasonal sea ice extent and increases in sea surface temperatures. One of the key uncertainties in this region is how the marine ecosystem will respond to seasonal shifts in the timing of spring sea ice retreat and/or delays in fall sea ice formation. Variations in upper ocean water hydrography, planktonic production, pelagic-benthic coupling and sediment carbon cycling are all influenced by sea ice and temperature change. To more systematically track the broad biological response to sea ice retreat and associated environmental change, an international consortium of scientists have developed a coordinated “Distributed Biological Observatory” (DBO) that includes selected biological measurements at multiple trophic levels, along with satellite and mooring measurements. The DBO currently focuses on five regional biological “hotspot” locations along a latitudinal gradient that allows for consistent sampling and monitoring at five biologically productive locations across a latitudinal gradient: DBO 1 (SLIP)-south of St. Lawrence Island (SLI), DBO2 (Chirikov)-north of SLI, DBO3 (southern Chukchi Sea), DBO4-NE Chukchi Sea,and DBO5-Barrow Canyon. This dataset contains benthic macroinfaunal population level from sediment samples collected at each station for the CCGS Sir Wilfrid Laurier cruise-Leg 1 in 2014, identified by station number (#), Station name (Stn. Name), Date (mm/dd/yy), latitude (°N), longitude (°W), and station depth (m). The following macroinfaunal parameters were determined: abundance, wet weight biomass (gww/m2), dry weight biomass (gC/m2), and taxon type.