cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.15468/dl.xfp6tj
title: Occurrence Download

description: A dataset containing 45 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ledermanniella linearifolia Engl."
 ]
}

 The dataset includes 45 records from 11 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027737-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2jh3d336
title: Photogrammetric scans of aerial photographs of North American glaciers

description: Introduction: 
 
 Between 1958 and 1999, Austin Post led the USGS collection of aerial imagery of North American glaciers. These images are primarily vertical stereo black and white images, although single oblique images, as well as color images have been collected. The glaciers of North America were the subjects, and the digital products made available here serve to document the changes that have occurred to the glaciers over the past 5 decades. The purpose of this project is to preserve the data contained within these film images in a digital format for future analysis of North American glacier change.
 
 File Layout: 
 
 The first level (this level) contains an overall data set of image metadata from 1964 - 1997 (nagapData.csv), an R script (searchData.R) to subset and download images from this data package, and a README file with instructions for using searchData.R. fileLayout.pdf shows the file structure and folder contents visually. There are also three kml files with flight path information by decade. 
 The second level is the year in which the pictures were taken. There are 32 years with images from 1964 – 1997. The majority of these folders are jpegs with notes provided by Austin Post. They also contain a year-specific csv (YYYY.csv) that contains image metadata for the entire year (date, roll numbers, location name, longitude, latitude, altitude, media, and comments). The overall data set (nagapData.csv) is the aggregate of each individual “YYYY.csv” file. 
 The glacier photos are located at the third level. The folders at this level are distinguished by camera roll number (1, 2, etc.), and image type (thumbnail, jpeg, or tif); some also contain fiducial and oblique image folders. This level primarily contains image files of aerial photos as either thumbnails, jpegs, or tifs. It also includes a csv with image metadata specific to each roll (date, roll numbers, location name, longitude, latitude, altitude, media, and comments), a text file (info.txt) with camera specifications unique to each image, and a text file (histo.txt or matchReport.txt) with color information and scanner specifications unique to each image.
DOI: 10.18739/a2dv1cp2c
title: Concordance of genetic and subfossil evidence for the Holocene radiation of the Holarctic Eubosmina, 1998-2006

description: We investigated the evolutionary radiation of a freshwater zooplankter that possesses a mixed breeding system and a detailed, dated, subfossil record. We estimated the phylogenetic relationships among the proposed species with complete nicotinamide adenine dinucleotide dehydrogenase subunit 2 mitochondrial gene sequence variation. We sequenced 374 Eubosmina specimens representing 10 out of 11 distinct morphospecies from 86 water bodies in three separate Holarctic regions. As expected for a Holocene radiation, there was a lack of monophyly for the proposed species and rare sharing of derived haplotypes among some species. Nevertheless, the proposed species exhibited little or no sharing of mitochondrial deoxyribonucleic acid haplotypes. Moreover, the phylogenetic and haplotype network results revealed a radiation pattern that is concordant with the subfossil record‐with an older Bosmina (E.) longispina radiating into several new forms. Our results bolster the subfossil, morphometric, experimental, and within-population genetic evidence that the common arctic B. (E.) longispina has radiated into several incipient species during the Holocene.
DOI: 10.18739/a2930nv9d
title: Paleoviral maintenance in a Holarctic Daphnia species complex, 2010-2012

description: Daphniids are critical members of Holarctic freshwater ecosystems. However, little is known of their interactions with RNA viruses. These data represent sequence information supporting the hypothesis that a viral gene from a Phelobvirus-like RNA virus has been transferred into the genomes of common species of Arctic Daphnia. The gene is similar to the RNA-Dependent RNA polymerase (RDRP) gene of phleboviruses (Phenuiviridae). The data also contain mitochondrial sequence from the host to classify the lineage of Daphnia that contains each "fossil" virus. These data indicate, for the first time, that common species of Daphnia in the Arctic have been infected with RNA viruses. Moreover, the evidence indicates that viral genes may be maintained for a presently unknown host function. Because the paleoviruses represent a "captured" viral gene (RDRP) that is often used for the classification of RNA viruses, these data also provide a means of identifying and studying novel viruses and their present interactions in Arctic freshwater.
DOI: 10.18739/a2599z254
title: Recent expansion of Daphnia across Beringia, 2001-2011

description: Daphnia pulex is quickly becoming an attractive model species in the field of ecological genomics due to the recent release of its complete genome sequence, a wide variety of new genomic resources, and a rich history of ecological data. Sequences of the mitochondrial NADH dehydrogenase subunit 5 and cytochrome c oxidase subunit 1 genes were used to assess the global phylogeography of this species, and to further elucidate its phylogenetic relationship to other members of the Daphnia pulex species complex. Using both newly acquired and previously published data, we analyzed 398 individuals from collections spanning five continents. Eleven strongly supported lineages were found within the D. pulex complex, and one lineage in particular, panarctic D. pulex, has very little phylogeographical structure and a near worldwide distribution. Mismatch distribution, haplotype network, and population genetic analyses are compatible with a North American origin for this lineage and subsequent spatial expansion in the Late Pleistocene. In addition, our analyses suggest that dispersal between North and South America of this and other species in the D. pulex complex has occurred multiple times, and is predominantly from north to south. Our results provide additional support for the evolutionary relationships of the eleven main mitochondrial lineages of the D. pulex complex. We found that the well-studied panarctic D. pulex is present on every continent except Australia and Antarctica. Despite being geographically very widespread, there is a lack of strong regionalism in the mitochondrial genomes of panarctic D. pulex ‐ a pattern that differs from that of most studied cladocerans. Moreover, our analyses suggest recent expansion of the panarctic D. pulex lineage across continents with some continents sharing identical haplotypes. The hypothesis that hybrid asexuality has contributed to the recent and unusual geographic expansion of the panarctic D. pulex lineage warrants further study.
DOI: 10.18739/a21j9781c
title: Forage quality and community composition of a slightly brackish wet sedge meadow, Yukon-Kuskokwim, Delta, Alaska, 2015-2016

description: This dataset contains cover change data on a sedge and a shrub species in coastal region of the Yukon Kuskokwim Delta. Cover was measured as part of a factorial warming and herbivory experiment with a response surface vegetation removal design. These data were collected as a complementary study to an NSF funded project (PI: Beard) to determine the effects of a phenological mismatch between goose grazing and the initiation of the growing season. The study is a collaboration of researchers at University of Alaska Anchorage and Utah State University. The goal of this complementary project was to determine the effects of warming on a brackish moist meadow vegetation community, determine whether goose herbivory can mediate community shifts caused by warming, and quantify the importance of direct versus indirect effects of warming. These data contain information about vegetation forage quality and productivity, community composition, and soil nutrient availability.
DOI: 10.18739/a2ws8hm5w
title: Partial Support for the Eleventh Conference on Hunting and Gathering Societies, 2015

description: The study of hunter-gatherer societies around the world, and in the Arctic and Alaska in particular, became a major field within the social and human sciences five decades ago. The goal of the Eleventh Conference on Hunting and Gathering Societies (CHAGS XI) is to continue the development of a unified field of hunter-gatherer studies. The general question of CHAGS XI therefore is how the results of the last 50 years and new research agendas can be utilized for the present and future. While many hunter-gatherers are forced to give up their ways of life and subsistence practices, they figure prominently in public discourses on ecological and ideological alternatives to industrial society. CHAGS XI will attract a variety of stakeholders in these debates, including indigenous representatives, NGOs, scholars, etc., from the U.S. and other countries. Based on fieldwork and research from the full spectrum of hunter-gatherer ways of life and from all perspectives scientific disciplines have to offer, the purpose of CHAGS XI is to bring hunter-gatherer studies back to the center of the human and social sciences. The conference will encourage discussions that will provide the social sciences and other research areas with in-depth understanding of hunter-gatherer societies in the United States, Arctic and globally. Through publication of the keynote addresses, results will be widely disseminated to local, national and international groups concerned with hunter-gatherer societies.
DOI: 10.18739/a2s17st0k
title: Effect of grazing, trampling, and fecal deposition on vegetation and soil nutrients, Yukon Kuskokwim Delta Alaska, 2016

description: Herbivores play a key role in the turnover, gains and losses of nutrients in ecosystems. Because nutrients are often limiting, herbivores influence plant growth and chemistry, and their own resource supply. Herbivores typically affect their environment in three ways: they consume aboveground biomass, they trample soil, and they return nutrients to soil via waste materials. The relative importance of these pathways is often unexplored because it requires conducting experiments that isolate these effects. Millions of geese migrate in the spring to sub-arctic coastal wetlands where they play a key role in determining the amount and quality of forage in this habitat. We conducted two field experiments on Carex subspathacea grazing lawns in western Alaska to investigate how these individual processes (grazing, trampling, and fecal addition) influence foliage quality (C:N) and soil nutrients. We isolated goose herbivory effects with five treatments: grazing only, trampling only, fecal addition only, all three treatments combined (full herbivory), and no herbivory.
DOI: 10.18739/a2n873073
title: Toward a predictive model of Arctic coastal retreat in a warming climate, Beaufort Sea, Alaska

description: The team proposes a three-year project to develop predictive models of coastal erosion and sediment transport along the Alaskan Beaufort Sea coast. This project has three distinct but complementary goals that include monitoring and modeling: 1) to quantify the rates and drivers of shoreline retreat through the past ~50 years using retrospective analyses of remotely sensed imagery, sea surface temperatures, ground temperatures, and meteorological records; 2) to characterize the processes driving coastal change in the Arctic via comprehensive monitoring of wave and thermal energy inputs, substrate properties, and inputs of water and sediment from fluvial systems; 3) to develop both descriptive and predictive models for coastal erosion in Alaska using both simplified physical models of individual processes, and models of suites of interrelated physical processes and hydrodynamics using DELFT3D.
DOI: 10.34740/kaggle/dsv/9980955
title: World Stock Prices ( Daily Updating )
DOI: 10.18739/a2hm52k5s
title: Nearshore oceanographic observations at Drew Point, Alaska, Summers 2009 and 2010

description: The Arctic climate is changing, inducing accelerating retreat of ice-rich permafrost coastal bluffs. Along Alaska’s Beaufort Sea coast, erosion rates have increased roughly threefold from 6.8 to 19 m per yr since 1955 while the sea ice-free season has increased roughly twofold from 45 to 100 days since
1979. We develop a numerical model of bluff retreat to assess the relative roles of the length of sea ice-free
season, sea level, water temperature, nearshore wavefield, and permafrost temperature in controlling
erosion rates in this setting. The model captures the processes of erosion observed in short-term
monitoring experiments along the Beaufort Sea coast, including evolution of melt notches, topple of ice
wedge-bounded blocks, and degradation of these blocks. Model results agree with time-lapse imagery
of bluff evolution and time series of ocean-based instrumentation. Erosion is highly episodic with 40% of
erosion is accomplished during less than 5% of the sea ice-free season. Among the formulations of the
submarine erosion rate we assessed, we advocate those that employ both water temperature and nearshore
wavefield. As high water levels are a prerequisite for erosion, any future changes that increase the frequency
with which water levels exceed the base of the bluffs will increase rates of coastal erosion. The certain
increases in sea level and potential changes in storminess will both contribute to this effect. As water
temperature also influences erosion rates, any further expansion of the sea ice-free season into the
midsummer period of greatest insolation is likely to result in an additional increase in coastal retreat rates.
 This dataset includes observations of water level, water temperature, and wave field collected in 2009 and 2010 near Drew Point, AK by investigators Anderson, Overeem, and Wobus, with help from Adam LeWinter. This data was used in a publication published in 2014 by Barnhart et al. Barnhart, K. R., R. S. Anderson, I. Overeem, C. Wobus, G. D. Clow, and F. E. Urban (2014), Modeling erosion of ice-rich permafrost bluffs along the Alaskan Beaufort Sea coast, Journal of Geophysical Research Earth Surface, 119, doi:10.1002/2013JF002845. Platform/Station/Site/Ship Information: A map of the sites can be found in Figure 2 of Barnhart et al. (2014). Exact latitude/longitude locations and temporal durations for each instrument is provided in the attached README.
DOI: 10.15468/dl.7y25xb
title: Occurrence Download

description: A dataset containing 3784 species occurrences available in GBIF matching the query:
{
 "and" : [
 "GadmGid is FRA.11.8_1",
 "OccurrenceStatus is Present",
 "TaxonKey is Pelodytes punctatus (Daudin, 1802)"
 ]
}

 The dataset includes 3784 records from 67 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0027738-241107131044228/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.18739/a2cv4bs24
title: Population genetics of a climate-indicating predator across the forest-tundra ecotone

description: Subarctic freshwater lakes and ponds in Alaska are important oases for polar biodiversity and resources for arctic peoples. However, this habitat is also among the most sensitive to disturbances such as heavy metal pollution, eutrophication, and drainage or desiccation from climate warming. Environmental indicator species in freshwater have both acted as sentinels for ongoing change and as proxies for historical change. Phantom midges (Chaoborus), for example, are among the most important freshwater dipterans for aquatic toxicology and for indicating a boreal zone climate. In some cases, Chaoborus is believed to be a better sentinel of boreal forest-tundra boundary changes than the tree line because trees can have a growth lag that is negligible in midges. The larvae of Chaoborus are also voracious predators of microcrustaceans and, as such, can strongly affect the species compositions of freshwater habitats. The PI has recently found that two species of Chaoborus are common well beyond the tree line in roadside ponds of the Seward Peninsula of northwestern Alaska. This finding provides an opportunity to improve understanding of how tundra lakes and ponds may change as they encounter a keystone predator of the boreal zone. Moreover, the effect of direct human disturbances such as road construction on the freshwaters of the boreal zone ? tundra boundary can be assessed.

Several aspects of the biology of Chaoborus in subarctic North America are poorly known. Because there are slight morphological differences between tundra species and well-studied temperate species, the geographic source and even the species name of the tundra populations are unclear. One objective of this research is to test hypotheses about the genetic affinities of Chaoborus that are presently found on the tundra. This involves phylogenetic comparisons of tundra specimens with those from eastern Asia, and with boreal Alaska. Another goal is to test the hypothesis that road construction has facilitated the expansion of boreal zone Chaoborus deep into the tundra. Testing this hypothesis involves testing for the erosion of genetic diversity on tundra ponds compared to forest ponds with high-resolution genetic markers. This project will also carry out paleoecological assessments of the rate and mode of colonization of tundra ponds. This research will inform environmental biologists, fisheries managers, engineers and planners about the role of human disturbance on the freshwater ecosystems across the tundra-boreal forest boundary at a critical time. The project will enhance or even enable comparative studies of environment-indicating chaoborids and promote a deeper understanding of recent and ongoing anthropogenic change in subarctic freshwaters. The speed and mode of colonization of tundra ponds by Chaoborus midges is important to paleoecology but unknown.
DOI: 10.6084/m9.figshare.27888720.v1
title: <b>Appendices to IAWA 2298</b>

description: <b>Appendix A.</b> Explanation of Appendix B.<b>Appendix B.</b> Dataset of the native woody species of Southern Africa extracted from the Botanical Database of Southern Africa (BODATSA, Le Roux et al. 2017).<b>Appendix C.</b> Block dimensions and weight ante and post combustion of the specimen samples of BRS. W: weight, L: radial length and D: diameter. The sample set labelled BRS18-2-xx_1 (in green) is stored at the ESI and the sample set labelled BRS18-2-xx_2 (in white) at CEPAM.
DOI: 10.18739/a2833mz8p
title: Collaborative Research: Year-round autonomous sampling of methane in Arctic lakes, Northwest Territories, Canada, 2011-2017

description: The investigators propose to measure methane concentrations in frozen lakes continuously throughout the Arctic winter using autonomous sampling devices, to more thoroughly address the variability in the methane flux from Arctic lakes to the atmosphere. Methane is a potent greenhouse gas, the release of which from Arctic sources is poised to increase with climate warming. This project will expand upon a successful pilot study that included the initial testing of autonomous continuous fluid sampler and sensor systems. The proposed expansion will involve additional capabilities and the deployment of a sampling unit in each of six small lakes along a north-south gradient in the Mackenzie River delta in the Canadian Arctic for a nine-month period, spanning the winter season. With these data the investigators aim to characterize the physical, chemical, and microbial conditions in the water column to elucidate hydrologic, microbial, and weathering processes during the winter season, when methane builds in lake water under the ice cover. The investigators hypothesize that sudden (week, days, or even hours) releases of methane, following spring flooding and ice cover breakup, produce a distinct atmospheric flux from Arctic lakes that would otherwise be missed, since most logistically reasonable sampling occurs in the summer months when methane concentrations in these lakes are low or below detection.
 The majority of methane flux to the Arctic atmosphere is estimated to come from soils and small lakes, although these estimates are based on few direct observations with large uncertainties. This proposed study, using in situ samplers and sensors, will allow an extensive microbial, gas and ion analytical program coupled with a network of physical and chemical sensor data to assess temporal conditions during winter months; to confirm fundamental processes and rates; to determine the interplay among microbial, geochemical and physical processes; and to develop a plan for a more inclusive study that takes advantage of low cost proxies for significant processes that best characterize temporal aspects of lake conditions. The project will enhance infrastructure for future research in the Arctic through the development of novel in situ sampling. The project will support several undergraduate and graduate students, providing valuable lab-based experience for students from non-research-intensive institutions. The investigators also will conduct two informal outreach activities to communicate the importance of Arctic climate change to primary school students while also teaching them about design and engineering. They also intend to work closely with Aurora College and Aurora Research Institute based in Inuvik, Canada, to engage First Nations youth.
DOI: 10.18739/a24b2x54z
title: Report for methane monitoring in Arctic Lakes in Northwest Territories, Canada, March 2016

description: The primary goal of fieldwork in spring 2016 was the deployment of OsmoSampler units in two of the project study lakes near Inuvik (region 3 in Figure 1, specifically Lakes 129 and 520), to
capture the ice-out period in higher temporal resolution. A secondary goal was the collection of
under-ice water samples for calibrating the OsmoSampler methane, ion, and microbiology data.
 The goal of the annual OsmoSampler deployments from August 2015 is to capture of a
continuous annual record of lake biogeochemistry, including under ice cover, to determine the
source, cycling, and fate of methane in these Canadian Arctic lakes. To this end, each
OsmoSampler system contains three different samplers, as well as a suite of sensors. The three
samplers are for methane ("CH4"), major/minor/trace elements ("Acid"), and microbial
community composition ("BOSS"). The sensor suite includes one sensor for dissolved oxygen
and temperature, one sensor for pressure, and one sensor for light penetration.
 The purpose of the higher resolution OsmoSamplers for deployment during this fieldwork is to
collect a second record of methane and dynamics during the critical ice-out period, with a higher
sampling resolution to permit ~daily intervals.These OsmoSamplers also contain CH4 and Acid
samplers, with pumps that pull water into the samplers at a faster speed (i.e. 20-membrane
OsmoPumps instead of 8-10 membrane pumps in the annual deployments). Sensors were also
included in the deployments to collect additional records of dissolved oxygen, temperature,
conductivity, light penetration, and water level, with multiple temperature sensors to understand
under-ice temperature stratification. BOSS samplers were not included in these OsmoSampler
deployments, as the volume required for samples was not amenable to scaling up.
 To calibrate the OsmoSampler data, under-ice water samples were also collected immediately
after opening a hole in the ice, to determine dissolve methane and ion concentrations as well as
lake microbial community composition.