干旱区生态环境知识资源中心(Arid): Cryoconite Hole Location in East-Antarctic Untersee Oasis Shapes Physical and Biological Diversity

Arid

DOI	10.3389/fmicb.2020.01165
	Cryoconite Hole Location in East-Antarctic Untersee Oasis Shapes Physical and Biological Diversity
	Weisleitner, Klemens 1,2; Perras, Alexandra Kristin 3; Unterberger, Seraphin Hubert 4; Moissl-Eichinger, Christine 3; Andersen, Dale T.5; Sattler, Birgit 1,2
通讯作者	Sattler, Birgit
来源期刊	FRONTIERS IN MICROBIOLOGY
ISSN	1664-302X
出版年	2020
卷号	11
英文摘要	Antarctic cryoconite holes (CHs) are mostly perennially ice-lidded and sediment-filled depressions that constitute important features on glaciers and ice sheets. Once being hydrologically connected, these microbially dominated mini-ecosystems provide nutrients and biota for downstream environments. For example, the East Antarctic Anuchin Glacier gradually melts into the adjacent perennially ice-covered Lake Untersee, and CH biota from this glacier contribute up to one third of the community composition in benthic microbial mats within the lake. However, biogeochemical features of these CHs and associated spatial patterns across the glacier are still unknown. Here we hypothesized about the CH minerogenic composition between the different sources such as the medial moraine and other zones. Further, we intended to investigate if the depth of the CH mirrors the CH community composition, organic matter (OM) content and would support productivity. In this study we show that both microbial communities and biogeochemical parameters in CHs were significantly different between the zones medial moraine and the glacier terminus. Variations in microbial community composition are the result of factors such as depth, diameter, organic matter, total carbon, particle size, and mineral diversity. More than 90% of all ribosomal sequence variants (RSV) reads were classified as Proteobacteria, Cyanobacteria, Bacteroidetes, Actinobacteria, and Acidobacteria. Archaea were detected in 85% of all samples and exclusively belonged to the classes Halobacteria, Methanomicrobia, and Thermoplasmata. The most abundant genus wasHalorubrum(Halobacteria) and was identified in nine RSVs. The core microbiome for bacteria comprised 30 RSVs that were affiliated with Cyanobacteria, Bacteroidetes, Actinobacteria, and Proteobacteria. The archaeal fraction of the core microbiome consisted of three RSVs belonging to unknown genera of Methanomicrobiales and Thermoplasmatales and the genusRice_Cluster_I(Methanocellales). Further, mean bacterial carbon production in cryoconite was exceptionally low and similar rates have not been reported elsewhere. However, bacterial carbon production insignificantly trended toward higher rates in shallow CHs and did not seem to be supported by accumulation of OM and nutrients, respectively, in deeper holes. OM fractions were significantly different between shallower CHs along the medial moraine and deeper CHs at the glacier terminus. Overall, our findings suggest that wind-blown material originating south and southeast of the Anuchin Glacier and deposits from a nunatak are assumed to be local inoculation sources. High sequence similarities between samples from the Untersee Oasis and other Antarctic sites further indicate long-range atmospheric transport mechanisms that complement local inoculation sources.
英文关键词	Anuchin Glacier 16S rRNA cryoconite holes mineralogy archaea bacterial activity biogeochemistry
类型	Article
语种	英语
国家	Austria ; USA
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000543830100001
WOS关键词	MCMURDO DRY VALLEYS ; COVERED LAKE UNTERSEE ; PERENNIAL ICE COVER ; DRONNING MAUD LAND ; BACTERIAL DIVERSITY ; CANADA GLACIER ; BIOGEOCHEMISTRY ; COMMUNITIES ; BIODIVERSITY ; ECOSYSTEMS
WOS类目	Microbiology
WOS研究方向	Microbiology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319544
作者单位	1.Univ Innsbruck, Inst Ecol, Innsbruck, Austria; 2.Austrian Polar Res Inst, Vienna, Austria; 3.Med Univ Graz, Med Res Ctr, Graz, Austria; 4.Univ Innsbruck, Unit Mat Technol, Innsbruck, Austria; 5.SETI Inst, Mountain View, CA USA
推荐引用方式 GB/T 7714	Weisleitner, Klemens,Perras, Alexandra Kristin,Unterberger, Seraphin Hubert,et al. Cryoconite Hole Location in East-Antarctic Untersee Oasis Shapes Physical and Biological Diversity[J],2020,11.
APA	Weisleitner, Klemens,Perras, Alexandra Kristin,Unterberger, Seraphin Hubert,Moissl-Eichinger, Christine,Andersen, Dale T.,&Sattler, Birgit.(2020).Cryoconite Hole Location in East-Antarctic Untersee Oasis Shapes Physical and Biological Diversity.FRONTIERS IN MICROBIOLOGY,11.
MLA	Weisleitner, Klemens,et al."Cryoconite Hole Location in East-Antarctic Untersee Oasis Shapes Physical and Biological Diversity".FRONTIERS IN MICROBIOLOGY 11(2020).