气候变化领域集成服务门户(CCPortal): Seasonality in land-ocean connectivity and local processes control sediment bacterial community structure and function in a High Arctic tidal flat

CCPortal

DOI	10.1093/femsec/fiad162
	Seasonality in land-ocean connectivity and local processes control sediment bacterial community structure and function in a High Arctic tidal flat
	Handler, Eleanor R.; Andersen, Sebastian D. J.; Gradinger, Rolf; McGovern, Maeve; Vader, Anna; Poste, Amanda E.
发表日期	2024
ISSN	0168-6496
EISSN	1574-6941
起始页码	100
结束页码	1
卷号	100 期号:1
英文摘要	Climate change is altering patterns of precipitation, cryosphere thaw, and land-ocean influxes, affecting understudied Arctic estuarine tidal flats. These transitional zones between terrestrial and marine systems are hotspots for biogeochemical cycling, often driven by microbial processes. We investigated surface sediment bacterial community composition and function from May to September along a river-intertidal-subtidal-fjord gradient. We paired metabarcoding of in situ communities with in vitro carbon-source utilization assays. Bacterial communities differed in space and time, alongside varying environmental conditions driven by local seasonal processes and riverine inputs, with salinity emerging as the dominant structuring factor. Terrestrial and riverine taxa were found throughout the system, likely transported with runoff. In vitro assays revealed sediment bacteria utilized a broader range of organic matter substrates when incubated in fresh and brackish water compared to marine water. These results highlight the importance of salinity for ecosystem processes in these dynamic tidal flats, with the highest potential for utilization of terrestrially derived organic matter likely limited to tidal flat areas (and times) where sediments are permeated by freshwater. Our results demonstrate that intertidal flats must be included in future studies on impacts of increased riverine discharge and transport of terrestrial organic matter on coastal carbon cycling in a warming Arctic. The gradient from High Arctic freshwater rivers to marine fjord systems was reflected in distinct bacterial diversity and substrate utilization patterns, highlighting the significance of land-ocean interactions for microbial community structure and function in such systems.
英文关键词	Arctic; bacterial community; functional diversity; land-ocean interactions; seasonal dynamics; tidal flat
语种	英语
WOS研究方向	Microbiology
WOS类目	Microbiology
WOS记录号	WOS:001146416500003
来源期刊	FEMS MICROBIOLOGY ECOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301044
作者单位	UiT The Arctic University of Tromso; University Centre Svalbard (UNIS); Norwegian Institute Nature Research; Northeastern University
推荐引用方式 GB/T 7714	Handler, Eleanor R.,Andersen, Sebastian D. J.,Gradinger, Rolf,et al. Seasonality in land-ocean connectivity and local processes control sediment bacterial community structure and function in a High Arctic tidal flat[J],2024,100(1).
APA	Handler, Eleanor R.,Andersen, Sebastian D. J.,Gradinger, Rolf,McGovern, Maeve,Vader, Anna,&Poste, Amanda E..(2024).Seasonality in land-ocean connectivity and local processes control sediment bacterial community structure and function in a High Arctic tidal flat.FEMS MICROBIOLOGY ECOLOGY,100(1).
MLA	Handler, Eleanor R.,et al."Seasonality in land-ocean connectivity and local processes control sediment bacterial community structure and function in a High Arctic tidal flat".FEMS MICROBIOLOGY ECOLOGY 100.1(2024).