Microbiomic Analysis of Bacteria Associated with Rock Tripe Lichens from Alpine Areas in Eastern Alps and Equatorial Africa
Zichen He, Takeshi Naganuma, Ryosuke Nakai, Jun Uetake, Martin W. Hahn
Current Microbiology, 81, 5, Springer Science and Business Media LLC, 14 Mar. 2024
Scientific journal, Abstract

The diversity of bacteria associated with alpine lichens was profiled. Lichen samples belonging to the Umbilicariaceae family, commonly known as rock tripe lichens, were gathered from two distinct alpine fellfields: one situated on Mt. Brennkogel located in the Eastern European Alps (Austria), and the other on Mt. Stanley located in the Rwenzori mountains of equatorial Africa (Uganda). The primary aim of this research was to undertake a comparative investigation into the bacterial compositions, and diversities, identifying potential indicators and exploring their potential metabolisms, of these lichen samples. Bulk genomic DNA was extracted from the lichen samples, which was used to amplify the 18S rRNA gene by Sanger sequencing and the V3-V4 region of the 16S rRNA gene by Illumina Miseq sequencing. Examination of the fungal partner was carried out through the analysis of 18S rRNA gene sequences, belonging to the genus Umbilicaria (Ascomycota), and the algal partner affiliated with the lineage Trebouxia (Chlorophyta), constituted the symbiotic components. Analyzing the MiSeq datasets by using bioinformatics methods, operational taxonomic units (OTUs) were established based on a predetermined similarity threshold for the V3-V4 sequences, which were assigned to a total of 26 bacterial phyla that were found in both areas. Eight of the 26 phyla, i.e. Acidobacteriota, Actinomycota, Armatimonadota, Bacteroidota, Chloroflexota, Deinococcota, Planctomycetota, and Pseudomonadota, were consistently present in all samples, each accounting for more than 1% of the total read count. Distinct differences in bacterial composition emerged between lichen samples from Austria and Uganda, with the OTU frequency-based regional indicator phyla, Pseudomonadota and Armatimonadota, respectively. Despite the considerable geographic separation of approximately 5430 km between the two regions, the prediction of potential metabolic pathways based on OTU analysis revealed similar relative abundances. This similarity is possibly influenced by comparable alpine climatic conditions prevailing in both areas.

Dense spatial variation of the eukaryotic and prokaryotic communities on the Gulkana Glacier, Alaska
Jun Uetake, Masato Ono, Suzunosuke Usuba, Akane Tsushima, Nozomu Takeuchi
15 May 2023

Spatiotemporal changes in communities of snow-ice microbes living on Gulkana Glacier, Alaska
Masato Ono, Nozomu Takeuchi, Akane Tsushima, Yukihiko Onuma, Kino Kobayashi, Daiki Seto, Suzunosuke Usuba, Fuki Konishi, Jun Uetake
15 May 2023

Modeling seasonal growth of phototrophs on bare ice on the Qaanaaq Ice Cap, northwestern Greenland
Onuma, Y, Takeuchi, N, Uetake, J, Niwano, M, Tanaka, S, Nagatsuka, N, Aoki, T
Journal of Glaciology, Sep. 2022, [Peer-reviewed]
English, Scientific journal

Spatial Distribution of Unique Biological Communities and Their Control Over Surface Reflectivity of the Stanley Glacier, Uganda
Jun Uetake, Denis Samyn, Simon Anguma, Nozomu Takeuchi
Frontiers in Earth Science, 10, Frontiers Media SA, 17 Feb. 2022, [Peer-reviewed], [Lead author]
Scientific journal, Diverse microbes have been revealed to live in glaciers worldwide, but only a few biological studies were dedicated to glaciers in tropical Africa. These glaciers are shrinking rapidly and are expected to disappear shortly. In this study, we carried out biological and glaciological field observations on Stanley Glacier, the largest remaining glacier in the Rwenzori Mountains, Uganda, Africa. Microbial aggregates ranging from micrometer to centimeter in size were found on the glacier surface and contained moss and various types of Chlorophyta, among which a new endemic species of green alga. Concentrations of total impurities on the glacier surface, including microbial aggregates, varied spatially and decreased as altitude increased. The large microbial aggregates (larger than 4 cm in diameter) were found only at the glacier surface near the terminus and side margins, where the surface was less frequently covered with snow. It is also shown that the total organic matter on the glacier surface is determined by the timing of snow cover, which affects the quantity of solar radiation reaching the glacier ice surface. Furthermore, the total impurity content was negatively correlated with surface reflectivity, revealing their potential role in albedo reduction at the glacier surface through positive feedback between enhanced meltwater and increased biological growth.

Cryoconite - From minerals and organic matter to bioengineered sediments on glacier's surfaces.
Piotr Rozwalak, Paweł Podkowa, Jakub Buda, Przemysław Niedzielski, Szymon Kawecki, Roberto Ambrosini, Roberto S Azzoni, Giovanni Baccolo, Jorge L Ceballos, Joseph Cook, Biagio Di Mauro, Gentile Francesco Ficetola, Andrea Franzetti, Dariusz Ignatiuk, Piotr Klimaszyk, Edyta Łokas, Masato Ono, Ivan Parnikoza, Mirosława Pietryka, Francesca Pittino, Ewa Poniecka, Dorota L Porazinska, Dorota Richter, Steven K Schmidt, Pacifica Sommers, Juliana Souza-Kasprzyk, Marek Stibal, Witold Szczuciński, Jun Uetake, Łukasz Wejnerowski, Jacob Yde, Nozomu Takeuchi, Krzysztof Zawierucha
The Science of the total environment, 150874, 150874, 07 Oct. 2021, [Peer-reviewed], [International Magazine]
English, Scientific journal, Cryoconite is a mixture of mineral and organic material covering glacial ice, playing important roles in biogeochemical cycles and lowering the albedo of a glacier's surface. Understanding the differences in structure of cryoconite across the globe can be important in recognizing past and future changes in supraglacial environments and ice-organisms-dust interactions. Despite the worldwide distribution and over a century of studies, the basic characteristics of cryoconite, including its forms and geochemistry, remain poorly studied. The major purpose of our study is the presentation and description of morphological diversity, chemical and photoautotrophs composition, and organic matter content of cryoconite sampled from 33 polar and mountain glaciers around the globe. Observations revealed that cryoconite included various morphologies including loose and granular forms. Granular cryoconite includes smooth, rounded, or irregularly shaped forms; with some having their surfaces covered by cyanobacteria filaments. The occurrence of granules increased with the organic matter content in cryoconite. Moreover, a major driver of cryoconite colouring was the concentration of organic matter and its interplay with minerals. The structure of cyanobacteria and algae communities in cryoconite differs between glaciers, but representatives of cyanobacteria families Pseudanabaenaceae and Phormidiaceae, and algae families Mesotaeniaceae and Ulotrichaceae were the most common. The most of detected cyanobacterial taxa are known to produce polymeric substances (EPS) that may cementing matter and form granules. Organic matter content in cryoconite varied between glaciers, ranging from 1% to >40%. The geochemistry of all the investigated samples reflected local sediment sources, except of highly concentrated Pb and Hg in cryoconite collected from European glaciers near industrialized regions, corroborating cryoconite as element-specific collectors and potential environmental indicator of anthropogenic activity. Our work supports a notion that cryoconite may be more than just simple sediment and instead exhibits complex structure with relevance for biodiversity and the functioning of glacial ecosystems.

Spatial and Temporal Variations in Pigment and Species Compositions of Snow Algae on Mt. Tateyama in Toyama Prefecture, Japan
Tomomi Nakashima, Jun Uetake, Takahiro Segawa, Lenka Procházková, Akane Tsushima, Nozomu Takeuchi
Frontiers in Plant Science, 12, Frontiers Media SA, 05 Jul. 2021, [Peer-reviewed]
Scientific journal, Snow algae are photosynthetic microbes that inhabit the melting snow surface in alpine and polar regions. We analyzed the pigment and species composition of colored snow collected on Mt. Tateyama in Japan during the melting seasons of 2015 and 2016. High-performance liquid chromatographic analyses of the pigments extracted from the colored snow showed that their composition varied within the study area and were classified into four types: Type A (astaxanthin-monoester dominant), Type B (medium astaxanthin-monoester content), Type C (abundant primary carotenoids and free-astaxanthin), and Type D (abundant primary carotenoids and astaxanthin diesters). Types A and B were most commonly observed in the study area, whereas Types C and D appeared only at specific sites. Analysis of the 18S ribosomal RNA (18S rRNA) gene revealed six major amplicon sequence variants (ASVs) of snow algae, belonging to the Sanguina, Chloromonas, and Chlainomonas groups. The relative abundance of the algal ASVs showed that Sanguina was dominant (>48%) in both Types A and B, suggesting that the difference in astaxanthin abundance between the two types was caused by the production of pigments in the algal cells. The algal community structures of Types C and D differed from those of Types A and B, indicating that the primary carotenoids and astaxanthin diesters were derived from certain algal species in these types. Therefore, astaxanthin-rich Sanguina algae mostly induced the red snow that appeared widely in this alpine area; however, they were partially dominated by Chloromonas or Chlainomonas algae, causing different pigment compositions.

Visualization of the seasonal shift of a variety of airborne pollens in western Tokyo
Jun Uetake, Yutaka Tobo, Satoshi Kobayashi, Keisuke Tanaka, Satoru Watanabe, Paul J. DeMott, Sonia M. Kreidenweis
Science of The Total Environment, 788, 147623, 147623, Elsevier BV, May 2021, [Peer-reviewed], [Lead author, Corresponding author]
Scientific journal

A hole in the nematosphere: tardigrades and rotifers dominate the cryoconite hole environment, whereas nematodes are missing
K. Zawierucha, D. L. Porazinska, G. F. Ficetola, R. Ambrosini, G. Baccolo, J. Buda, J. L. Ceballos, M. Devetter, R. Dial, A. Franzetti, U. Fuglewicz, L. Gielly, E. Łokas, K. Janko, T. Novotna Jaromerska, A. Kościński, A. Kozłowska, M. Ono, I. Parnikoza, F. Pittino, E. Poniecka, P. Sommers, S. K. Schmidt, D. Shain, S. Sikorska, J. Uetake, N. Takeuchi
Journal of Zoology, 313, 1, 18, 36, Jan. 2021, [Peer-reviewed]
Scientific journal

Seasonal Trends of Atmospheric Ice Nucleating Particles Over Tokyo
Yutaka Tobo, Jun Uetake, Hitoshi Matsui, Nobuhiro Moteki, Yasushi Uji, Yoko Iwamoto, Kazuhiko Miura, Ryohei Misumi
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 125, 23, Dec. 2020, [Peer-reviewed]
English, Scientific journal

Thawing permafrost: an overlooked source of seeds for Arctic cloud formation
Jessie M Creamean, Thomas C J Hill, Paul J DeMott, Jun Uetake, Sonia Kreidenweis, Thomas A Douglas
Environmental Research Letters, 15, 8, 084022, 084022, IOP Publishing, 05 Aug. 2020, [Peer-reviewed]
Scientific journal

Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer
Jun Uetake, Thomas C. J. Hill, Kathryn A. Moore, Paul J. DeMott, Alain Protat, Sonia M. Kreidenweis
Proceedings of the National Academy of Sciences, 117, 24, 13275, 13282, Proceedings of the National Academy of Sciences, 16 Jun. 2020, [Peer-reviewed]
Scientific journal, Microorganisms are ubiquitous and highly diverse in the atmosphere. Despite the potential impacts of airborne bacteria found in the lower atmosphere over the Southern Ocean (SO) on the ecology of Antarctica and on marine cloud phase, no previous region-wide assessment of bioaerosols over the SO has been reported. We conducted bacterial profiling of boundary layer shipboard aerosol samples obtained during an Austral summer research voyage, spanning 42.8 to 66.5°S. Contrary to findings over global subtropical regions and the Northern Hemisphere, where transport of microorganisms from continents often controls airborne communities, the great majority of the bacteria detected in our samples were marine, based on taxonomy, back trajectories, and source tracking analysis. Further, the beta diversity of airborne bacterial communities varied with latitude and temperature, but not with other meteorological variables. Limited meridional airborne transport restricts southward community dispersal, isolating Antarctica and inhibiting microorganism and nutrient deposition from lower latitudes to these same regions. A consequence and implication for this region’s marine boundary layer and the clouds that overtop it is that it is truly pristine, free from continental and anthropogenic influences, with the ocean as the dominant source controlling low-level concentrations of cloud condensation nuclei and ice nucleating particles.

Glacially sourced dust as a potentially significant source of ice nucleating particles
Yutaka Tobo, Kouji Adachi, Paul J. DeMott, Thomas C. J. Hill, Douglas S. Hamilton, Natalie M. Mahowald, Naoko Nagatsuka, Sho Ohata, Jun Uetake, Yutaka Kondo, Makoto Koike
Nature Geoscience, 12, 4, 253, 258, Springer Science and Business Media LLC, Apr. 2019, [Peer-reviewed]
English, Scientific journal

Bacterial community changes with cryoconite granule size and their susceptibility to exogenous nutrients on 10 glaciers in northwestern Greenland [preprint]
Jun Uetake, Naoko Nagatsuka, Yukihiko Onuma, Nozomu Takeuchi, Hideaki Motoyama, Teruo Aoki
Cold Spring Harbor Laboratory, 08 Jan. 2019
Cryoconite granules, which are dark-colored biological aggregates on glaciers, effectively accelerate the melting of glacier ice. Bacterial community varies with granule size, however, community change in space and their susceptibility to environmental factors has not been described yet. Therefore, we focused on bacterial community from 4 different granule sizes (30-249 μm, 250-750 μm, 750-1599 μm, more than 1600 μm diameter) in 10 glaciers in northwestern Greenland and their susceptibility for exogenous nutrients in cryoconite hole. A filamentous cyanobacterium Phormidesmis priestleyi, which has been frequently reported from glaciers in Arctic was abundant (10-26%) across any size of granules on most of glaciers. Bacterial community across glaciers became similar with size increase, and whence smallest size fractions contain more unique genera in each glacier. Multivariate analysis suggests that phosphate, which is significantly higher in one glacier (Scarlet Heart Glacier), is primary associated with bacterial beta diversity. Correlation coefficients between abundance of major genera and nutrients largely changed with granule size, suggesting that nutrients susceptibility to genera changes with growth process of granule (e.g. P. priestleyi was affected by nitrate in early growth stage).

Seasonal Changes of Airborne Bacterial Communities Over Tokyo and Influence of Local Meteorology.
Jun Uetake, Yutaka Tobo, Yasushi Uji, Thomas C J Hill, Paul J DeMott, Sonia M Kreidenweis, Ryohei Misumi
Frontiers in microbiology, 10, 1572, 1572, 2019, [Peer-reviewed], [Lead author], [International Magazine]
English, Scientific journal

Bacterial community changes with granule size in cryoconite and their susceptibility to exogenous nutrients on NW Greenland glaciers
Uetake, J., Nagatsuka, N., Onuma, Y., Takeuchi, N., Motoyama, H., Aoki, T.
FEMS microbiology ecology, 95, 7, fiz075, 2019, [Peer-reviewed], [Lead author]
Scientific journal

Temporal variations of cryoconite holes and cryoconite coverage on the ablation ice surface of Qaanaaq Glacier in northwest Greenland
Nozomu Takeuchi, Ryutaro Sakaki, Jun Uetake, Naoko Nagatsuka, Rigen Shimada, Masashi Niwano, Teruo Aoki
Annals of Glaciology, 59, 77, 21, 30, Cambridge University Press (CUP), Dec. 2018, [Peer-reviewed]
English, Scientific journal

Development and decay of cryoconite holes on Qaanaaq Glacier in northwest Greenland
Takeuchi, N, R. Sakaki, J. Uetake, N. Nagatsuka, R. Shimada, M. Niwano, T. Aoki
Ann. Glaciol., 59, 1, 10, 2018, [Peer-reviewed]

Biogeography of cryoconite forming cyanobacteria on polar and Asian glaciers
Takahiro Segawa, Takahiro Yonezawa, Arwyn Edwards, Ayumi Akiyoshi, Sota Tanaka, Jun Uetake, Tristram Irvine-Fynn, Kotaro Fukui, Zhongqin Li, Nozomu Takeuchi
JOURNAL OF BIOGEOGRAPHY, 44, 12, 2849, 2861, Dec. 2017, [Peer-reviewed]
English, Scientific journal

Changes in the fungal community of Austre Broggerbreen deglaciation area, Ny-Alesund, Svalbard, High Arctic
Masaharu Tsuji, Jun Uetake, Yukiko Tanabe
MYCOSCIENCE, 57, 6, 448, 451, Nov. 2016, [Peer-reviewed]
English, Scientific journal

Microbial community variation in cryoconite granules on Qaanaaq Glacier, NW Greenland
Uetake, J, S. Tanaka, T. Segawa, N. Takeuchi, N. Nagatsuka, H. Motoyama, T. Aoki
FEMS Microbiology Ecology, 92, 9, Jun. 2016, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal, Cryoconite granules are aggregations of microorganisms with mineral particles that form on glacier surfaces. To understand the processes by which the granules develop, this study focused on the altitudinal distribution of the granules and photosynthetic microorganisms on the glacier, bacterial community variation with granules size and environmental factors affecting the growth of the granules. Size-sorted cryoconite granules collected from five different sites on Qaanaaq Glacier were analyzed. C and N contents were significantly higher in large (diameter greater than 250 μm) granules than in smaller (diameter 30-249 μm) granules. Bacterial community structures, based on 16S rRNA gene amplicon sequencing, were different between the smaller and larger granules. The filamentous cyanobacterium Phormidesmis priestleyi was the dominant bacterial species in larger granules. Multivariate analysis suggests that the abundance of mineral particles on the glacier surface is the main factor controlling growth of these cyanobacteria. These results show that the supply of mineral particles on the glacier enhances granule development, that P. priestleyi is likely the key species for primary production and the formation of the granules and that the bacterial community in the granules changes over the course of the granule development.

Variations in Sr and Nd isotopic ratios of mineral particles in cryoconite in western Greenland
Nagatsuka, N., Takeuchi, N., Uetake, J., Shimada, R., Onuma, Y., Tanaka, S., Nakano, T.
Frontiers in Earth Science, 4, 93, 2016, [Peer-reviewed]
English, Scientific journal

Geographical variations in cryoconite on Greenland Icesheet
Takeuchi Nozomu, Nagatsuka Naoko, Uetake Jun, Tanaka Sota, Onuma Yukihiko, Shimada Rigen
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 71, 71, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2015
Japanese

Spatial variations in abundance and composition of snow algal pigments in Mt. Tateyama in Toyama prefecture, Japan in melting season of 2015
Nakashima Tomomi, Takeuchi Nozomu, Uetake Jun, Segawa Takahiro, Tanabe Yukiko, Watanabe Kenichi, Tsuji Masaharu, Miyauchi Kenshiro, Okamoto Chika, Hori Yoichiro
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 181, 181, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2015
Japanese

A snow community on a mountain glacier (Condpriri glacier) in Bolivia
Tanaka Sota, Takeuchi Nozomu, Asaoka Yoshihiro, Uetake Jun
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 2, 2, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2015
Japanese

Impurities and snow algal communities of Conejeras Glacier in the Andes Mountains in Colombia, South America
Konno Yudai, Takeuchi Nozomu, Uetake Jun, Hara Kousuke
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2015, 1, 1, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2015
Japanese

Novel Biogenic Aggregation of Moss Gemmae on a Disappearing African Glacier
Jun Uetake, Sota Tanaka, Kosuke Hara, Yukiko Tanabe, Denis Samyn, Hideaki Motoyama, Satoshi Imura, Shiro Kohshima
PLOS ONE, 9, 11, Nov. 2014, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012
Aoki, T, S. Matoba, S. Yamaguchi, T. Tanikawa, M. Niwano, K. Kuchiki, K. Adachi, J. Uetake, H. Motoyama, M. Hori
Bulletin of Glaciological Research, 32, 0, 21, 31, Japanese Society of Snow and Ice, Mar. 2014, [Peer-reviewed]
English, Scientific journal

Spatial variations in impurities (cryoconite) on glaciers in northwest Greenland
Nozomu Takeuchi, Naoko Nagatsuka, Jun Uetake, Rigen Shimada
Bulletin of Glaciological Research, 32, 1, 85, 94, Japanese Society of Snow and Ice, 2014, [Peer-reviewed]
English, Scientific journal

Mineralogical composition of cryoconite on glaciers in northwest Greenland
Naoko NAGATSUKA, Nozomu TAKEUCHI, Jun UETAKE, Rigen SHIMADA
Bulletin of Glaciological Research, 32, 107, 114, Japanese Society of Snow and Ice, 2014
Scientific journal

Field activities of “Snow Impurities and Glacial Microbe effects on abrupt warming in the Arctic” (SIGMA) Project in Greenland in 2011-2013
Aoki, T, S. Matoba, J. Uetake, N. Takeuchi, H. Motoyama
Bulletin of Glaciological Research, 32, 3, 20, The Japanese Society of Snow and Ice = 日本雪氷学会, 2014, [Peer-reviewed]
English, Scientific journal, Field activities of the "Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic" (SIGMA) Project in Greenland in the summer season of 2011-2013 are reported; this consists of (1) glaciological and meteorological observations and (2) biological observations. In 2011, we conducted a field reconnaissance in the Qaanaaq, Ilulissat and Kangerlussuaq areas to enable continuous meteorological observations with automatic weather stations (AWS), campaign observations for glaciology, meteorology and Biology and shallow ice core drilling, which were planned for 2012-2014. Based on the results, we chose the Qaanaaq area in northwest Greenland as our main activity area and the Kangerlussuaq area in mid-west Greenland partly for biological observations. In 2012, we conducted field observations for (1) and (2) mentioned above together with installations of two AWSs at site SIGMA-A on The Greenland ice sheet (GrIS) and at site SIGMA-B on the Qaanaaq ice cap (QIC) from June to August. Surface snow and ice over all of the QIC melted in July and August 2012, and most of the Glacier surface appeared to be dark-colored, probably due to mineral dust and glacial microbial products. In 2013, we carried out similar observations in the Qaanaaq area. However, the weather and Glacier surface conditions were considerably different from those in 2012. Snow cover over the summer of 2013 remained over large areas with elevations higher than about 700 m on QIC. Biological activity on the Glacier surface appears to be substantially lower as compared to that in 2012. ? Japanese Society of Snow and Ice.

Numerical simulation of spectral albedos of glacier surfaces covered with glacial microbes in Northwestern Greenland
Teruo Aoki, Katsuyuki Kuchiki, Masashi Niwano, Sumito Matoba, Jun Uetake, Kazuhiko Masuda, Hiroshi Ishimoto
AIP, 2013
International conference proceedings

DNA analysis for section identification of individual Pinus pollen grains from Belukha glacier, Altai Mountains, Russia
Fumio Nakazawa, Jun Uetake, Yoshihisa Suyama, Ryo Kaneko, Nozomu Takeuchi, Koji Fujita, Hideki Motoyama, Satoshi Imura, Hiroshi Kanda
Environmental Research Letters, 8, 1, 014032, Jan. 2013, [Peer-reviewed]
English, Scientific journal

Isolation of oligotrophic yeasts from supraglacial environments of different altitude on the Gulkana Glacier (Alaska)
Jun Uetake, Yoshitaka Yoshimura, Naoko Nagatsuka, Hiroshi Kanda
FEMS MICROBIOLOGY ECOLOGY, 82, 2, 279, 286, Nov. 2012, [Peer-reviewed]
English, Scientific journal

Chemical properties of snow cover at the northwestern Greenland Ice Sheet
Matoba Sumito, Uetake Jun, Aoki Teruo
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 151, 151, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012
Japanese

Glacial Biological Research on Ruwenzori mountains, Tropical Africa
HARA KOSUKE, TANAKA SOTA, UETAKE JUN, KOHSHIMA SHIRO
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 216, 216, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012
Japanese

Microbial composition changes in cryoconite formation process in Northwestern Greenland
Uetake Jun, Motoyama Hideaki, Aoki Teruo
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 155, 155, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012
Japanese

Seasonal variation of bacteria from surface snow pit at NEEM, Greenland
Uetake Jun, Azuma Kumiko, Kuramoto Takayuki, Hirabayashi Motohiro, Miyake Takayuki, Motoyama Hideaki
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 219, 219, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012
Japanese

Aggregation of bryophyte (Moss) on glacier surface in Rwenzori Mts., Uganda
Uetake Jun, Tanabe Yukiko, Hara Kosuke, Tanaka Sota, Motoyama Hideaki, Kohshima Shiro
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 54, 54, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012
Japanese

Variations in spectral reflectance of snow surface in thawing season in Tateyama, Mountains,Japan
Tanaka Monami, Takeuchi Nozomu, Onua yukihiko, Uetake Jun
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012, 201, 201, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012
Japanese

Establishing the Timing of Chemical Deposition Events on Belukha Glacier, Altai Mountains, Russia, Using Pollen Analysis
Fumio Nakazawa, Takayuki Miyake, Koji Fujita, Nozomu Takeuchi, Jun Uetake, Toshiyuki Fujiki, Vladimir Aizen, Masayoshi Nakawo
ARCTIC ANTARCTIC AND ALPINE RESEARCH, 43, 1, 66, 72, Feb. 2011, [Peer-reviewed]
English, Scientific journal

Evidence for propagation of cold-adapted yeast in an ice core from a Siberian Altai glacier
Jun Uetake, Shiro Kohshima, Fumio Nakazawa, Nozomu Takeuchi, Koji Fujita, Takayuki Miyake, Hideki Narita, Vladimir Aizen, Masayoshi Nakawo
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 116, 1, Feb. 2011, [Peer-reviewed]
English, Scientific journal

Reevaluation of the reconstruction of summer temperatures from melt features in Belukha ice cores, Siberian Altai
Sachiko Okamoto, Koji Fujita, Hideki Narita, Jun Uetake, Nozomu Takeuchi, Takayuki Miyake, Fumio Nakazawa, Vladimir B. Aizen, Stanislav A. Nikitin, Masayoshi Nakawo
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 116, 2, D02110, Jan. 2011, [Peer-reviewed]
English, Scientific journal

Microorganisms variation in snow fall on mountainside of Mt. Tokachi
Jun Uetake, Hideaki Motoyama, Takayuki Miyake, Teruya Maki, Atsushi Matsuki, Tomoya Baba
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 104, 2011, [Peer-reviewed]
English, Scientific journal

Seasonal variations of snow chemistry at NEEM, Greenland
Takayuki Kuramoto, Kumiko Goto-Azuma, Motohiro Hirabayashi, Takayuki Miyake, Hideaki Motoyama, Jun Uetake
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 86, 2010, [Peer-reviewed]
English, Scientific journal

Preliminary study of microorganisms analysis in North Greenland Eemian Ice Driling site
Jun Uetake, Jun Uetake, Kumiko Azuma, Takayuki Kuramoto, Hideaki Motoyama, Hiroshi Kanda
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 148, 2010, [Peer-reviewed]
English, Scientific journal

Psychrophilic yeast communities on the Gulkana glacier, Alaska
UETAKE JUN, Nagatsuka Naoko, Yoshimura Yoshitaka
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 136, 136, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2009
Japanese

Stratigraphy analysis focused on air bubbles in Belukha ice core, Russian Altai
Okamoto Sachiko, Fujita Koji, Narita Hideki, Uetake Jun, Takeuchi Nozomu, Miyake Takayuki, Nakazawa Fumio, Aizen Vladimir, Nikitin Stanislav, Nakawo Masayoshi
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 134, 134, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2009
Japanese

Distribution of surface dust in the bare ice area of the Greenland Ice Sheet derived from Landsat ETM images.:Presumption of surface condition from spectral characteristics
Ito Hiroki, Takeuchi Nozomu, Kohshima Shiro, Uetake Jun
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 25, 25, The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2009
Japanese

DNA analysis of a single Pinus pollen grain in a glacier
Fumio Nakazawa, Jun Uetake, Hiroshi Kanda, Yoshihisa Suyama, Nozomu Takeuchi, Koji Fujita
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 127, 2009, [Peer-reviewed]
English, Scientific journal

Pollen analysis of snow samples from Antarctica
Fumio Nakazawa, Jun Uetake, Hiroshi Kanda
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2008, 78, 2008, [Peer-reviewed]
English, Scientific journal

Microorganisms density changes during glacial-interglacial cycle in Dome Fuji ice core
Jun Uetake, Hideaki Motoyama, Hiroshi Kanda
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2008, 146, 2008, [Peer-reviewed]
English, Scientific journal

Estimation of net accumulation rate at a Patagonian glacier by ice core analyses using snow algae
Shiro Kohshima, Nozomu Takeuchi, Jun Uetake, Takayuki Shiraiwa, Ryu Uemura, Naohiro Yoshida, Sumito Matoba, Maria Angelica Godoi
Global and Planetary Change, 59, 1-4, 236, 244, Oct. 2007, [Peer-reviewed]
English, Scientific journal

Reconstruction of summer temperature by using melt features in an ice core at Belukha Glacier, Russian Altai Mountains
Okamoto Sachiko, Fujita Koji, Narita Hideki, Uetake Jun, Takeuchi Nozomu, Miyake Takayuki, Nakazawa Fumio
Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2007, 7, 7, THE JAPANESE SOCIETY OF SNOW AND ICE, 2007
Japanese

Spatial distribution and abundance of red snow algae on the Harding Icefield, Alaska derived from a satellite image
Nozomu Takeuchi, Roman Dial, Shiro Kohshima, Takahiro Segawa, Jun Uetake
GEOPHYSICAL RESEARCH LETTERS, 33, 21, Nov. 2006, [Peer-reviewed]
English, Scientific journal

A snow algal community on Akkem glacier in the Russian Altai mountains
Nozomu Takeuchi, Jun Uetake, Koji Fujita, Vladimir B. Aizen, Stanislav D. Nikitin
ANNALS OF GLACIOLOGY, VOL 43, 2006, 43, 378, +, 2006
English, International conference proceedings

Chemical composition of surface ice at July 1st Glacier, Qilian Mountains, China
Miyake Takayuki, Uetake Jun, Matoba Sumito, Sakai Akiko, Fujita Koji, Fujii Yoshiyuki, Yao Tandong, Nakawo Masayoshi
Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 202, 202, THE JAPANESE SOCIETY OF SNOW AND ICE, 2006
Japanese

Glacio-biological ice cores analyses from Belukha Glacier.
Uetake Jun, Kohshima Shiro, Nakazawa Fumio, Segawa Takahiro, Miyake Takayuki, Yoshimura Yoshitaka, Narita Hideki, Fujita Koji, Takeuchi Nozomu, Nakao Masayoshi
Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 206, 206, THE JAPANESE SOCIETY OF SNOW AND ICE, 2006
Japanese

A snow algal community and pH on Qiyi Glacier in the Qilian Mountains, China
Takeuchi Nozomu, Uetake Jun, Segawa Takahiro
Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 205, 205, THE JAPANESE SOCIETY OF SNOW AND ICE, 2006
Japanese

Dating of seasonal snow/firn accumulation layers using pollen analysis
Fumio Nakazawa, Koji Fujita, Nozomu Takeuchi, Toshiyuki Fujiki, Jun Uetake, Vladimir Aizen, Masayoshi Nakawo
JOURNAL OF GLACIOLOGY, 51, 174, 483, 490, 2005
English, Scientific journal

Studies on Atmosphere, Snow/Ice, and Glacial Microbes on Greenland Ice Sheet by SIGMA and relevant projects: ─A linkage to the ArCS II Project─
AOKI Teruo, MATOBA Sumito, NIWANO Masashi, KUCHIKI Katsuyuki, TANIKAWA Tomonori, TAKEUCHI Nozomu, YAMAGUCHI Satoru, MOTOYAMA Hideaki, FUJITA Koji, YAMASAKI Tetsuhide, IIZUKA Yoshinori, HORI Masahiro, SHIMADA Rigen, UETAKE Jun, NAGATSUKA Naoko, ONUMA Yukihiko, HASHIMOTO Akihiro, ISHIMOTO Hiroshi, TANAKA Taichu Yasumich, OSHIMA Naga, KAJINO Mizuo, ADACHI Kouji, KUROSAKI Yutaka, SUGIYAMA Shin, TSUTAKI Shun, GOTO-AZUMA Kumiko, HACHIKUBO Akihiro, KAWAKAMI Kaoru, KINASE Takeshi, Journal of the Japanese Society of Snow and Ice, 83, 2, 169, 191, Mar. 2021
Currently occurring rapid warming in the Arctic could affect global environmental changes through sea level rise and remote atmospheric effect. The surface melting of the Greenland Ice Sheet (GrIS) involves various uncertainties, which are issues to be elucidated for accurate climate projections. To clarify how the atmosphere, snow/ice, and glacial microbes in the GrIS affect the ice sheet change under global warming, the SIGMA and SIGMA-II projects were conducted from FY2011 to FY2019. In parallel, big Arctic research projects such as GRENE and ArCS were also done, which accelerated the Japanese Greenland researches. This paper describes the research results of the SIGMA and SIGMA-II projects as well as the related research projects in the categories of (1) in-situ observations of the atmosphere, snow/ice, and glacial microbes, (2) ice core drilling, (3) satellite observation, and (4) numerical modeling. Furthermore, we discuss current issues in these studies, a linkage to the Cryosphere subject of recently launched ArCS II Project, and the importance of capacity building., The Japanese Society of Snow and Ice, Japanese

Greenland records of aerosol source and atmospheric lifetime changes from the Eemian to the Holocene
S. Schüpbach, H. Fischer, M. Bigler, T. Erhardt, G. Gfeller, D. Leuenberger, O. Mini, R. Mulvaney, N. J. Abram, N. J. Abram, L. Fleet, M. M. Frey, E. Thomas, A. Svensson, D. Dahl-Jensen, E. Kettner, H. Kjaer, I. Seierstad, J. P. Steffensen, S. O. Rasmussen, P. Vallelonga, M. Winstrup, A. Wegner, B. Twarloh, K. Wolff, K. Schmidt, K. Goto-Azuma, T. Kuramoto, T. Kuramoto, M. Hirabayashi, J. Uetake, J. Uetake, J. Zheng, J. Bourgeois, D. Fisher, D. Zhiheng, C. Xiao, M. Legrand, A. Spolaor, J. Gabrieli, C. Barbante, J. H. Kang, S. D. Hur, S. B. Hong, H. J. Hwang, S. Hong, M. Hansson, Y. Iizuka, I. Oyabu, R. Muscheler, F. Adolphi, F. Adolphi, O. Maselli, J. McConnell, E. W. Wolff, Nature Communications, 9, 1, 01 Dec. 2018
Springer Science and Business Media LLC, English

Characteristics of droplet size distributions in low-level stratiform clouds observed from Tokyo skytree
Ryohei Misumi, Yasushi Uji, Yutaka Tobo, Kazuhiko Miura, Jun Uetake, Yoko Iwamoto, Takeshi Maesaka, Koyuru Iwanami, Journal of the Meteorological Society of Japan, 96, 4, 405, 413, 2018
Meteorological Society of Japan, English, Report scientific journal

Biological studies on the Greenland ice sheet
永塚 尚子, 竹内 望, 植竹 淳, 月刊地球, 37, 3, 72, 82, Mar. 2015
海洋出版, Japanese

2011年及び2012年に北西グリーンランド氷床上で観測された光吸収性積雪不純物濃度
AOKI Teruo, MATOBA Sumito, YAMAGUCHI Satoru, TANIKAWA Tomonori, NIWANO Masashi, KUCHIKI Katsuyuki, ADACHI Kouji, UETAKE Jun, MOTOYAMA Hideaki, HORI Masahiro, Bulletin of Glaciological Research, 32, 21, 31, Aug. 2014
日本雪氷学会, English

Chemical composition of surface snow and ice, and precipitation on Qiyi Glacier, Qilian Mountains, western China
三宅 隆之, 植竹 淳, 的場 澄人, 雪氷, 76, 1, 3, 17, Jan. 2014
日本雪氷学会, Japanese

O34-06 グリーンランド、カナック氷河上のクリオコナイト粒の形成プロセスと分布(口頭発表)
植竹 淳, 瀬川 高弘, 永塚 尚子, 田中 聡太, 竹内 望, 本山 秀明, 青木 輝夫, 日本微生物生態学会講演要旨集, 2014, 125, 125, 2014
日本微生物生態学会, Japanese

Eemian interglacial reconstructed from a Greenland folded ice core
D. Dahl-Jensen, M. R. Albert, A. Aldahan, N. Azuma, D. Balslev-Clausen, M. Baumgartner, A. M. Berggren, M. Bigler, T. Binder, T. Blunier, J. C. Bourgeois, E. J. Brook, S. L. Buchardt, C. Buizert, E. Capron, J. Chappellaz, J. Chung, H. B. Clausen, I. Cvijanovic, S. M. Davies, P. Ditlevsen, O. Eicher, H. Fischer, D. A. Fisher, L. G. Fleet, G. Gfeller, V. Gkinis, S. Gogineni, K. Goto-Azuma, A. Grinsted, H. Gudlaugsdottir, M. Guillevic, S. B. Hansen, M. Hansson, M. Hirabayashi, S. Hong, S. D. Hur, P. Huybrechts, C. S. Hvidberg, Y. Iizuka, T. Jenk, S. J. Johnsen, T. R. Jones, J. Jouzel, N. B. Karlsson, K. Kawamura, K. Keegan, E. Kettner, S. Kipfstuhl, H. A. Kjær, M. Koutnik, T. Kuramoto, P. Köhler, T. Laepple, A. Landais, P. L. Langen, L. B. Larsen, D. Leuenberger, M. Leuenberger, C. Leuschen, J. Li, V. Lipenkov, P. Martinerie, O. J. Maselli, V. Masson-Delmotte, J. R. McConnell, H. Miller, O. Mini, A. Miyamoto, M. Montagnat-Rentier, R. Mulvaney, R. Muscheler, A. J. Orsi, J. Paden, C. Panton, F. Pattyn, J. R. Petit, K. Pol, T. Popp, G. Possnert, F. Prié, M. Prokopiou, A. Quiquet, S. O. Rasmussen, D. Raynaud, J. Ren, C. Reutenauer, C. Ritz, T. Röckmann, J. L. Rosen, M. Rubino, O. Rybak, D. Samyn, C. J. Sapart, A. Schilt, A. M.Z. Schmidt, J. Schwander, S. Schüpbach, I. Seierstad, J. P. Severinghaus, S. Sheldon, S. B. Simonsen, J. Sjolte, A. M. Solgaard, T. Sowers, P. Sperlich, H. C. Steen-Larsen, K. Steffen, J. P. Steffensen, D. Steinhage, T. F. Stocker, C. Stowasser, A. S. Sturevik, W. T. Sturges, A. Sveinbjörnsdottir, A. Svensson, J. L. Tison, J. Uetake, P. Vallelonga, R. S.W. Van De Wal, G. Van Der Wel, B. H. Vaughn, B. Vinther, E. Waddington, A. Wegner, I. Weikusat, J. W.C. White, F. Wilhelms, M. Winstrup, E. Witrant, E. W. Wolff, C. Xiao, J. Zheng, Nature, 493, 7433, 489, 494, 24 Jan. 2013
English

Improved direct-count method by fluorescence microscope for low-biomass ice core (in Japanese)
Jun Uetake, Kumiko Goto-Azuma, Hideaki Motoyama, Antarctic record, 56, 1, 57, 67, 30 Mar. 2012
Ice cores recovered from ice sheets contain microorganisms that were transported to the surface of the ice sheet along with airborne dust. The abundance of microorganisms in ice cores, as measured by direct cell count under a fluorescence microscope, is generally lower than that in other aquatic environments. It is possible that the abundance of microorganisms in ice cores is underestimated due to the degradation of fluorescent dye or because non-specific fluorescence from mineral particles inhibits the fluorescence signal from microorganisms. To investigate this possibility, we tested 4 ty..., National Institute of Polar Research, Japanese

「北極域における積雪汚染及び雪氷微生物が急激な温暖化に及ぼす影響評価に関する研究」(SIGMAプロジェクト)の紹介
青木輝夫, 朽木勝幸, 庭野匡思, 田中泰宙, 保坂征宏, 橋本明弘, 本山秀明, 兒玉裕二, 植竹淳, 竹内望, 的場澄人, 杉山慎, 山口悟, 本吉弘岐, 岩田幸良, 杉浦幸之助, 八久保晶弘, 堀雅裕, 谷川朋範, 本谷研, 山崎哲秀, 日本気象学会大会講演予稿集, 102, 2012

Depth distribution of microorganisms in the surface pit from accumulation area in McCall Glacier, Alaska
Jun Uetake, Jun Uetake, Hideaki Motoyama, Fujii Yoshiyuki, Kazuhide Satow, Matt Nolan, Shuhei Takahashi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 0, 199, 199, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, English

グリーンランドNEEMにおける観測報告
東久美子, 青木周司, 東信彦, 飯塚芳徳, 植竹淳, 川村賢二, 神田啓史, 倉元隆之, 小端拓郎, 笹公和, 佐藤基之, 瀬川高弘, 高村近子, 中澤高清, 平林幹啓, 藤井理行, 藤田秀二, 堀彰, 堀内一穂, 三宅隆之, 三宅隆之, 宮本淳, 本山秀明, 極域科学・宙空圏・気水圏・生物・地学シンポジウム講演予稿集(CD-ROM), 2011, 2011

Measurement of crystal size in Belukha ice core, Siberian Altai
Sachiko Okamoto, Koji Fujita, Hideki Narita, Jun Uetake, Fumio Nakazawa, Nozomu Takeuchi, Takayuki Miyake, V. B. Aizen, S. A. Nikitin, Masayoshi Nakawo, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 0, 207, 207, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, English

The use of DNA analysis in sectional identification of a Pinus pollen grain found in Belukha Glacier, Altain Mountains, Russia
Nakazawa Fumio, Uetake Jun, Suyama Yoshihisa, Kaneko Ryou, Takeuchi Nozomu, Fujita Koji, Motoyama Hideaki, Kanda Hiroshi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 0, 55, 55, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

Communities of algae and cyanobacteria on glaciers in west Greenland
Uetake Jun, Naganuma Takeshi, Hebsgaard Martin Bay, Kanda Hiroshi, Kohshima Shiro, Polar science, 4, 1, 71, 80, May 2010
Communities of algae and cyanobacteria on two glaciers in west Greenland (the Qaanaaq and Russel glaciers) were analyzed and compared with the aim of explaining why the Qaanaaq Glacier (in northwestern Greenland) has a dark-colored surface in satellite images whereas the Russel Glacier (in western central Greenland) has a light-colored surface. We found that algal andcyanobacterial communities differed between the glaciers and that the amount of biomass was higher on the colder glacier (Qaanaaq Glacier). The community on the Qaanaaq Glacier was composed mainly of green algae, whereas that on the Russel Glacier was dominated by cyanobacteria. Despite the shorter melting period (due to colder air temperature) for the QaanaaqGlacier, the biovolume of algae and cyanobacteria was 2.35 times higher than that on the Russel Glacier at a similar altitude, suggesting greater primary production on the Qaanaaq Glacier. We discuss the possible effects of temperature, nutrient concentrations, and cryoconite holes (melt-holes in the glacier) on the community structure and productivity of algae and cyanobacteria on each glacier, and consider the influence of the identified differences in algal and cyanobacterial communities on the amount of surface melt., National Institute of Polar Research, English

グリーンランド深層氷床コア掘削計画(NEEM計画)における微生物解析の検討
植竹淳, 植竹淳, 東久美子, 倉元隆之, 本山秀明, 神田啓史, 雪氷研究大会講演要旨集, 2010, 2010

グリーンランド・NEEMにおける積雪中の化学成分の季節変化
倉元隆之, 植竹淳, 植竹淳, 東久美子, 平林幹啓, 三宅隆之, 本山秀明, 雪氷研究大会講演要旨集, 2010, 2010

グリーンランド深層氷床コア掘削計画(NEEM計画)の展望
東久美子, 青木周司, 東信彦, 飯塚芳徳, 植竹淳, 川村賢二, 神田啓史, 倉元隆之, 小端拓郎, 笹公和, 佐藤基之, 瀬川高弘, 高村近子, 中澤高清, 平林幹啓, 藤井理行, 藤田秀二, 堀彰, 堀内一穂, 三宅隆之, 宮本淳, 本山秀明, 極域科学・宙空圏・気水圏・生物・地学シンポジウム講演予稿集(CD-ROM), 2010, 2010

Distribution of surface albedo in the Western bare ice area of the Greenland Ice Sheet derived from MODIS images
Hiroki Ito, Nozomu Takeuchi, Shiro Kohshima, Jun Uetake, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 0, 95, 95, 2010
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, English

Reconstructed summer temperature in Belukha ice core and neighbor glacier changes
Sachiko Okamoto, Koji Fujita, Hideki Narita, Jun Uetake, Takayuki Miyake, Fumio Nakazawa, Nozomu Takeuchi, Vladimir B. Aizen, Stanislav A. Nikitin, Masayoshi Nakowo, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 0, 94, 94, 2010
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, English

P-68 Diversity of eukaryotes in cryoconite on Greenland Ice sheet(Poster Session)
UETAKE JUN, KANEKO RYO, MOTOYAMA HIDEAKI, 日本微生物生態学会講演要旨集, 26, 128, 128, 2010
日本微生物生態学会, Japanese

DNA analysis of a single Pinus pollen grain in a glacier (Part 2)
Nakazawa Fumio, Uetake Jun, Suyama Yoshihisa, Kaneko Ryou, Takeuchi Nozomu, Fujita Koji, Motoyama Hideaki, Kanda Hiroshi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 0, 93, 93, 2010
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

North Greenland Eemian Ice Driling
Kumiko Goto-Azuma, Jun Uetake, Kenji Kawamura, Hiroshi Kanda, Takayuki Kuramoto, Takuro Kobashi, Takahiro Segawa, Chiikako Takamura, Motohiro Hirabayashi, Yoshiyuki Fujii, Shuji Fujita, Takayuki Miyake, Hideaki Motoyama, Shuji Aoki, Takakiyo Nakazawa, Nobuhiko Azuma, Motoyuki Sato, Yoshinori Iizuka, Atsushi Miyamoto, Kimikazu Sasa, Akira Hori, Kazuho Horiuchi, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 4, 01 Jan. 2010
English

Spore-forming halophilic bacteria isolated from Arctic terrains: Implications for long-range transportation of microorganisms
Yukimura Kise, Nakai Ryosuke, Kohshima Shiro, Uetake Jun, Kanda Hiroshi, Naganuma Takeshi, Polar science, 3, 3, 163, 169, Nov. 2009
Organisms living in the Arctic terrains such as Greenland have to deal with low temperature conditions. The mechanisms by which bacteria resist to low temperature are largely unknown; however, a well-known survival strategy of the microorganisms inhabiting the Arctic is spore forming. Moreover, halophilic bacteria are often resistant to various stresses. We have attempted isolation of spore-forming halophilic bacteria from Arctic terrains. We isolated 10 strains of spore-forming halophilic bacteria from the samples collected from a glacial moraine in Qaanaaq, Greenland in July 2007. Identification based on 16S rRNA gene sequence similarities showed that the isolates were closely related to the Oceanobacillus, Ornithinibacillus, Virgibacillus, Gracilibacillus, and Bacillus genera. In addition, the 16S rRNA sequences of some isolates were extremely similar to those of strains from the desert sand in China (100% identity, near full length), the source of the so-called "yellow dust." Previous research indicated that yellow dust had been transported to Greenland by the wind. Our research implies the long-range transportation of these microorganisms to locations such as the Arctic., National Institute of Polar Research, English

P-54 アラスカ、グルカナ氷河における好冷性酵母群集について(ポスター発表)
植竹 淳, 永塚 尚子, 吉村 義隆, 日本微生物生態学会講演要旨集, 25, 76, 76, 2009
日本微生物生態学会, Japanese

日本地球惑星科学連合2008年大会参加報告
中澤 文男, 三宅 隆之, 紺屋 恵子, 田中 基樹, 五十嵐 誠, 植竹 淳, 雪氷 : 日本雪氷協會雜誌, 70, 5, 507, 509, 15 Sep. 2008
日本雪氷学会, Japanese

04-062 Snow algal communities on the glaciers in West Greenland(Extremophiles)
Uetake Jun, Naganuma Takeshi, Kanda Hiroshi, Kohshima Shiro, 日本微生物生態学会講演要旨集, 24, 89, 89, 2008
日本微生物生態学会, Japanese

Stratigraphical studies in accumulation area of McCall glacier, Alaska, 2004
SATOW Kazuhide, Uetake Jun, Takahashi Shuhei, Sato Kengo, Yamazaki Tetsuhide, Takahashi Akiyoshi, Nolan Matt, Igarashi Makoto, Fujii Yoshiyuki, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2006, 0, 105, 105, 2006
THE JAPANESE SOCIETY OF SNOW AND ICE, Japanese

Meteorological observation at July 1st Glacier in northwest China from 2002 to 2005
SAKAI Akiko, MATSUDA Yoshihiro, FUJITA Koji, MATOBA Sumito, UETAKE Jun, SATOW Kazuhide, DUAN Keqin, PU Jianchen, NAKAWO Masayoshi, YAO Tandong, Bull. Glaciological Res., 23, 23, 32, 01 Jan. 2006
English

Preliminary observations of sub-surface and shallow ice core at July 1st Glacier, China in 2002-2004
UETAKE Jun, SAKAI Akiko, MATSUDA Yoshihiro, FUJITA Koji, NARITA Hideki, MATOBA Sumito, DUAN Keqin, NAKAWO Masayoshi, YAO Tandong, Bulletin of glaciological research, 23, 85, 93, 01 Jan. 2006
English

Biological ice-core analysis of Sofiyskiy glacier in the Russian Altai
UETAKE J., Ann. Glaciol., 43, 70, 78, 2006

Concentrations, deposition rates and source variations of n-alkanes in Sofiyskiy Glacier, Russian Altai Mountains
MIYAKE Takayuki, NAKAZAWA Fumio, KOHNO Mika, UETAKE Jun, SUZUKI Keisuke, KAMEDA Takao, FUJII Yoshiyuki, NAKAWO Masayoshi, OHTA Keiichi, Bulletin of glaciological research, 22, 81, 87, 01 Mar. 2005
English

Size distribution and deposition rate of dust in an ice core at Belukha Glacier, Russian Altai Mountains
Miyake Takayuki, Fujii Yoshiyuki, Nakazawa Fumio, Uetake Jun, Takeuchi Nozomu, Fujita Koji, Nakawo Masayoshi, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2005, 0, 147, 147, 2005
THE JAPANESE SOCIETY OF SNOW AND ICE

Glacio-biological ice cores analyses from Belukha Glacier
Uetake Jun, Kohshima Shiro, Nalazawa Fumio, Takeuchi Nozomu, Miyake Takayuki, Fujita Koji, Nakawo Masayoshi, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2005, 0, 148, 148, 2005
THE JAPANESE SOCIETY OF SNOW AND ICE

Distribution of red snow on the Harding Icefield in Alaska, derived from a satellite image
Takeuchi Nozomu, DIal Roman, Kohshima Shiro, Segawa Takahiro, Uetake Jun, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2005, 0, 37, 37, 2005
THE JAPANESE SOCIETY OF SNOW AND ICE

A report on ice core drilling on the western plateau of Mt. Belukha in the Russian Altai Mountains in 2003
Takeuchi Nozomu, Takahashi Akiyoshi, Uetake Jun, Yamazaki Tetsuya, Aizen Vladimir B., Joswiak Daniel, Surazakov Arzhan, Nikitin Stanislav, Polar meteorology and glaciology, 18, 121, 133, Nov. 2004
A 171m deep ice core from the surface to the bottom has been successfully drilled on the West Belukha snow-firn Plateau in the Russian Altai Mountains in the summer of 2003. The drill system used in this project was an electro-mechanical drill with a barrel 135cm long and 9.5cm in inner diameter manufactured by Geo Tecs Co., Japan. The maximum core length for a drilling run is 55cm. It took 87.5 hours in actual working time of 7 working days to drill the core down to the bottom of the glacier. The total number of drilling runs was 325. The mean length of the drilled core was 48.6cm. Most of the cores were not brittle and had a good cylindrical shape. High air temperature above the melting point in the drilling shelter caused some trouble in drilling. One of the major troubles was slip of cutters due to adhesion of cutting tips to the cutters and shoes., National Institute of Polar Research, English

ロシア・アルタイ山脈ベルーハ氷河でのアイスコア掘削
植竹 淳, 雪氷, 66, 1, 89, 93, 15 Jan. 2004
日本雪氷学会, Japanese

Glacio-biological research on Qiyi Glacier, Qi-lian Mountains, China
Uetake Jun, Khoshima Shiro, Takeuchi Nozomu, sakai akiko, Matsuda Yoshihiro, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2004, 0, 103, 103, 2004
THE JAPANESE SOCIETY OF SNOW AND ICE

Application of pollen analysis to dating of ice cores from lower-latitude glaciers
Nakazawa Fumio, Fujita Koji, Uetake Jun, Kohno Mika, Fujiki Toshiyuki, Serguei M. Arkhipov, Kameda Takao, Suzuki Keisuke, Fujii Yoshiyuki, Journal of Geophysical Research, 109, 4, F04001, 2004
English

Stratigraphy and ice grains of a 25.3m ice core from Sofiyskiy Glacier, Russian Altai Mountains, in 2001
KAMEDA Takao, FUJII Yoshiyuki, SUZUKI Keisuke, KOHNO Mika, NAKAZAWA Fumio, UETAKE Jun, SAVATYUGIN Lev M., ARKHIPOV Serguei M., PONOMAREV Ivan A., MIKHAILOV Nikolay N., Bulletin of glaciological research, 21, 65, 69, 01 Jan. 2004
日本雪氷学会, English

Meteorological observations on Sofiyskiy Glacier, Russian Altai Mountains
Suzuki Keisuke, Kameda Takao, Kohno Mika, Nakazawa Fumio, Uetake Jun, Fujii Yoshiyuki, Polar meteorology and glaciology, 16, 140, 148, Nov. 2002
Meteorological observations were carried out on Sofiyskiy Glacier from July 7 to 17, 2001. Air temperature, relative humidity, wind direction, wind speed, atmospheric pressure and global radiation were measured with automatic instruments every ten minutes. Snow surface height was measured using a stake installed in the surface snow several times a day. The net gain of snow surface during the observation period was 268 mm. In the first half of the observation period, air temperature exceeded 3°C during the daytime, but air temperature never became positive during the latter half of the observation period. The heat balance was examined from the meteorological data. The values of estimated snowmelt and observed snowmelt correspond almost exactly., National Institute of Polar Research, English

Outline of Japan-Russia joint Glaciological Research on Sofiyskiy Glacier, Russian Altai Mountains in 2000 and 2001
FUJII Yoshiyuki, KAMEDA Takao, NISHIO Fumihiko, SUZUKI Keisuke, KOHNO Mika, NAKAZAWA Fumio, UETAKE Jun, SAVATYUGIN Lev M., ARKHIPOV Serguei M., PONOMAREV lvan A., MIKHAILOV Nikolay N., Bulletin of glaciological research, 19, 53, 58, 01 Feb. 2002
日本雪氷学会, English

High net accumulation rates at Campo de Hielo Patagonico Sur, South America, revealed by analysis of a 45.97 m long ice core
T Shiraiwa, S Kohshima, R Uemura, N Yoshida, S Matoba, J Uetake, MA Godoi, ANNALS OF GLACIOLOGY, VOL 35, 35, 84, 90, 2002
English

International joint research on Arctic natural aerosols under warm conditions in Southern Greenland
Grants-in-Aid for Scientific Research
08 Sep. 2023 - 31 Mar. 2026
當房 豊, 吉田 淳, 植竹 淳, 大畑 祥, 足立 光司
Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (International Collaborative Research), National Institute of Polar Research, 23KK0067

氷河・積雪生態系における雪氷藻類へのツボカビ感染症の動態解明
科学研究費助成事業
01 Apr. 2022 - 31 Mar. 2026
鏡味 麻衣子, 三木 健, 竹内 望, 植竹 淳, 村上 正志, 瀬川 高弘
極地や高山に分布する氷河・積雪生態系には，低温でも繁殖可能な特殊な藻類である雪氷藻類が生息している。雪氷藻類が増えると雪氷面が暗色化し雪氷の融解を加速する効果があるため，その動態は世界的な注目を集めている。この雪氷藻類にツボカビという菌類が寄生すると大量死を引き起こしうる。さらに地球温暖化に伴い雪氷藻類へのツボカビ感染は蔓延拡大する可能性がある。そこで，本研究では世界で初めてツボカビと雪氷藻類の宿主寄生者関係を解明し，ツボカビが雪氷藻類に与える影響を評価し，温暖化によるツボカビ感染症動態の変化を予測するために，以下のことを行った。
1）雪氷藻類とツボカビの宿主寄生者関係の把握
試料は月山や八甲田など日本国内の積雪生態系から試料を採取し、解析に用いた。顕微鏡観察により各調査地の雪氷藻類へのツボカビ感染を確認すし、観察できた雪氷藻類寄生性ツボカビを1ペアずつ拾いDNA解析を行い(シングルセル解析)，ツボカビと雪氷藻類との対応関係(宿主寄生者ネットワーク)を把握した。その結果、それぞれの地域に固有のツボカビが出現することが明らかとなった。
2）感染症動態に及ぼす環境要因の解明
アラスカ・グルカナ氷河において，標高や氷表面形態など環境条件の異なる複数の地点で同時期に集中的に試料採取を行った。ツボカビの感染度合(寄生率・多重感染度)を計数し、環境条件による違いを調べたところ、標高による差は顕著ではなかったが、同じ標高でも水たまり（クリオコナイトホール）で寄生率が高くなることが判明した。
日本学術振興会, 基盤研究(B), 横浜国立大学, 23K24985

氷河・積雪生態系における雪氷藻類へのツボカビ感染症の動態解明
科学研究費助成事業
01 Apr. 2022 - 31 Mar. 2026
鏡味 麻衣子, 三木 健, 竹内 望, 植竹 淳, 村上 正志, 瀬川 高弘
日本学術振興会, 基盤研究(B), 横浜国立大学, 22H03731

Seasonal change and the origins of bioaerosol in the forest.
Grants-in-Aid for Scientific Research
01 Apr. 2022 - 31 Mar. 2025
植竹 淳
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 22K06382

Expansion of microbial blooming on glaciers induced by abrupt environmental changes
Grants-in-Aid for Scientific Research
01 Apr. 2019 - 31 Mar. 2024
竹内 望, 植竹 淳, 瀬川 高弘, 米澤 隆弘, 幸島 司郎, 服部 祥平
当初2020年度に予定していたアラスカ氷河の野外調査は，2021年度に予算繰り越しを行い実施する計画を立てていた．しかしながら，新型コロナ感染症の流行は収まることはなく，2021年度も海外野外調査を実施することはできなかった．その代わり，国内の積雪表面を対象に野外調査を実施し，さらに過去に採取された試料の分析をすすめた．国内の積雪では，雪氷藻類の繁殖が進んだ表面には，藻類お捕食者となるクマムシやワムシも多く存在することを発見し，論文で発表した（Ono et al., 2021）．またアラスカの赤雪の分析を進めたところ，赤雪細胞の表面に大量の多糖類が分泌されていることが明らかになり，この多糖類が細胞の凝集効果を持っていることが明らかになり，論文に発表した（Folika et al., 2020）．氷河表面の暗色化の原因物質の一つ，クリオコナイトについても過去に採取したサンプルの分析を進めた．クリオコナイトの粒構造分析を行なった結果，内部では嫌気条件となっており，そこに繁殖する嫌気的細菌類が特に窒素循環に重要な役割を果たしていることが明らかになった（Segawa et al., 2020）．中央アジアの氷河ではアルベドの時空間変動が，クリオコナイトの表面量の変動で説明できることが明らかになった（Yue et al., 2020）． さらに，クリオコナイトには放射性元素が特異的に濃縮していることも明らかになった（Baccolo et al., 2020）．2021年度に繰り越した予算は，研究遂行に必須である雪氷試料の化学成分を分析するイオンクロマトグラフィーが故障したため，一部を新しく購入するために利用した．
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Chiba University, 19H01143

Elucidation of Changes in the fungal communities in seasonal variations using by next generation sequence
Grants-in-Aid for Scientific Research
01 Apr. 2016 - 31 Mar. 2018
Tsuji Masaharu
In this study, we investigated the changes of fungal community in soil collected from different season at the same sampling point of East Ongul Island, East Antarctica using by next generation sequencer.
As a result of next generation sequence analysis, the fungal sequence data were classified to 128 OTU. By detailed analysis of the OTU about changes of the fungal community by different seasons (Spring and Autumn), the fungal community was dramatically changed by seasons. This is a first report about changes of the fungal community by seasons in Antarctica.
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, National Institute of Polar Research, 16K12643

Effects of global environmental changes on glacier ecosystems
Grants-in-Aid for Scientific Research
01 Apr. 2014 - 31 Mar. 2018
Kohshima Shiro
We genetically analyzed microorganisms collected from the glaciers in various part of the world and found regional difference in species composition of bacteria and cyanobacteria in cryoconites, biogenic dark granules on the glacier that accelerate glacier melting. We could also identify symbiotic bacteria of glacier animals. We developed mathematical model simulating changes in cryoconite holes, melt holes on the glacier formed by cryoconite, to establish the mass valance model of the glacier including biological albedo reducing process.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Kyoto University, 26241020

消え行く熱帯氷河の微生物多様性の解明
科学研究費助成事業
01 Apr. 2015 - 31 Mar. 2017
植竹 淳
昨年度に行ったケニア山の氷河に生息している微生物の多様性に関する予備調査を踏まえ、氷河上での不均一性や同一地点での経年変化、また氷河周辺土壌に与える影響を評価するために、ルイス氷河において観測機器の回収、観測、サンプルの採取を行った。現地に設置したインターバルカメラの結果から、本氷河の融解による表面低下が非常に大きいことがわかり、設置期間中の２０１７年２月に氷河中流部の岩が露出し、ルイス氷河が上下に分断する様子を記録することができた。
DNA分析の結果、同氷河が隣国のウガンダ、ルウェンゾリ山の氷河よりも中国、天山山脈や北極、スバールバードの氷河に生息している微生物の群集構造に近いことがわかり、氷河上の微生物が全球的な粒子の移動と循環の影響を受けている可能性を示した。
日本学術振興会, 基盤研究(C), 15K07234

Effects of snow impurities and glacial microbes on abrupt warming in the Arctic
Grants-in-Aid for Scientific Research
01 Apr. 2011 - 31 Mar. 2016
Aoki Teruo, MOTOYAMA Hideaki, TAKEUCHI Nozomu, MATOBA Sumito, HORI Masahiro, HACHIKUBO Akihiro, YAMAGUCHI Satoru, TANAKA Yasumichi, IWATA Yukiyoshi, SUGIURA Konosuke, KODAMA Yuji, FUJITA Koji, KUCHIKI Katsuyuki, NIWANO Masashi, HOSAKA Masahiro, HASHIMOTO Akihiro, TANIKAWA Tomonori, TANAKA Yasumichi, UETAKE Jun, NAGATSUKA Naoko, SUGIYAMA Shin, MOTOYOSHI Hiroki, SHIMODA Seiji, MOTOYA Ken
From field observations on Greenland ice sheet, it was found that the contribution to albedo reduction in accumulation area by snow impurities such as black carbon (BC) is smaller than that by snow grain growth. Drastic surface melting event in July 2012 was accelerated by downward longwave radiation from low cloud. In ablation area, glacial microbes were contained in surface impurities and could contribute to the albedo reduction remarkably. Satellite remote sensing confirmed that the cause of darkening of ice sheet surface after 2000 is snow grain growth in accumulation area and the expansions of bare ice and dark area including glacial microbes in ablation area. We drilled a 223 m ice core in northwest Greenland ice sheet and analyzed the BC concentrations since 1660, which has a peak around 1920-1930 several times higher than the present value.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), Japan, Meteorological Research Institute, 23221004

Warming events and their impacts during the past 150,000 years viewed from Greenland ice
Grants-in-Aid for Scientific Research
01 Apr. 2010 - 31 Mar. 2016
Azuma Kumiko, KAWAMURA Kenji, FUJITA Shuji, UETAKE Jun, MOTOYAMA Hideaki, HIRABAYASHI Motohiro, KOBASHI Takuro, TAKAMURA Chikako, KURAMOTO Takayuki, SEGAWA Takahiro, AOKI Shuji, AZUMA Nobuhiko, IIZUKA Yoshinori
We analyzed the ice core drilled under the international project North Greenland Eemian Ice Drilling. The air temperature during the warmest period of Eemian interglacial was warmer than the present by 8℃±４℃, which caused extensive surface melt in north Greenland. The thickness of the northwest Greenland ice sheet decreased by 400±250ｍ during 6000 years, which was much smaller than that had been expected. Mass loss of Antarctic ice sheet should have played a role in sea-level rise during the Eemian. Variations of methane, nitrous oxide, noble gases in the air extracted from the ice core, and those of ionic species and bacterial cell concentrations in ice provided us with valuable information on changes in atmospheric circulation, vegetation, microbial activities, mean ocean temperature etc during the warm periods and abrupt warming events.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), National Institute of Polar Research, 22221002

Accelerate the melting of tropical glacier by glacier organisms
Grants-in-Aid for Scientific Research
01 Apr. 2013 - 31 Mar. 2015
UETAKE Jun
Tropical regions are not well represented in glacier biology, yet many tropical glaciers are under threat of disappearance due to climate change. Here we report a novel biogenic aggregation at the terminus of a glacier in the Rwenzori Mountains, Uganda. The material was formed by uniseriate protonemal moss gemmae and protonema. Molecular analysis of five genetic markers determined the taxon as Ceratodon purpureus, a cosmopolitan species that is widespread in tropical to polar region. Given optimal growing temperatures of isolate is 20–30℃, the cold glacier surface might seem unsuitable for this species. However, the cluster of protonema growth reached approximately 10℃ in daytime, suggesting that diurnal increase in temperature may contribute to the moss’s ability to inhabit the glacier surface. The aggregation is also a habitat for microorganisms, and the disappearance of this glacier will lead to the loss of this unique ecosystem.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), 大学共同利用機関法人情報・システム研究機構(新領域融合研究センター及びライフサイ, 25740012

Biological analysis of ice core from Antarctica and reconstruction of past environment
Grants-in-Aid for Scientific Research
2008 - 2010
UETAKE Jun
In Dome Fuji ice core, filamentous bacteria-like particle, had not been observed in the surface, were found in some layers. As concentration of coccoid bacteria is high in the end of glacial age when dust particle concentration is high, these match suggest coccoid bacteria are transported by wind with other particles like dust. This result indicate similar tendency as previous study in Vostok, and support them. Otherwise, concentration of filamentous bacteria-like particle is high in mid-last glacial age and early-Holocene, and these have no relationship with dust particle.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Transdisciplinary Research Integration Center, 20710020