期刊
MOLECULAR ECOLOGY
卷 25, 期 15, 页码 3752-3767出版社
WILEY
DOI: 10.1111/mec.13715
关键词
bacteria; biogeography; cryoconite; ecosystem engineering; keystone species; Svalbard
资金
- AU University Research Fund
- Welsh Livery Guild scholarship
- South African National Research Foundation Fellowship
- Great Britain Sasakawa Foundation
- [NERC NE/K000942/1]
- [NERC NE/G006253/1]
- Grants-in-Aid for Scientific Research [26241020, 26247078, 16H01772] Funding Source: KAKEN
- NERC [NE/K000942/1, NE/G006253/1] Funding Source: UKRI
- Natural Environment Research Council [NE/G006253/1, NE/K000942/1] Funding Source: researchfish
Microbial colonization of glacial ice surfaces incurs feedbacks which affect the melting rate of the ice surface. Ecosystems formed as microbe-mineral aggregates termed cryoconite locally reduce ice surface albedo and represent foci of biodiversity and biogeochemical cycling. Consequently, greater understanding the ecological processes in the formation of functional cryoconite ecosystems upon glacier surfaces is sought. Here, we present the first bacterial biogeography of an ice cap, evaluating the respective roles of dispersal, environmental and biotic filtration occurring at local scales in the assembly of cryoconite microbiota. 16S rRNA gene amplicon semiconductor sequencing of cryoconite colonizing a Svalbard ice cap coupled with digital elevation modelling of physical parameters reveals the bacterial community is dominated by a ubiquitous core of generalist taxa, with evidence for a moderate pairwise distance-decay relationship. While geographic position and melt season duration are prominent among environmental predictors of community structure, the core population of taxa appears highly influential in structuring the bacterial community. Taxon co-occurrence network analysis reveals a highly modular community structured by positive interactions with bottleneck taxa, predominantly Actinobacteria affiliated to isolates from soil humus. In contrast, the filamentous cyanobacterial taxon (assigned to Leptolyngbya/Phormidesmis pristleyi) which dominates the community and binds together granular cryoconite are poorly connected to other taxa. While our study targeted one ice cap, the prominent role of generalist core taxa with close environmental relatives across the global cryosphere indicate discrete roles for cosmopolitan Actinobacteria and Cyanobacteria as respective keystone taxa and ecosystem engineers of cryoconite ecosystems colonizing ice caps.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据