干旱区生态环境知识资源中心(Arid): Biotic Interactions in Experimental Antarctic Soil Microcosms Vary with Abiotic Stress

Arid

DOI	10.3390/soilsystems3030057
	Biotic Interactions in Experimental Antarctic Soil Microcosms Vary with Abiotic Stress
	Shaw, E. Ashley; Wall, Diana H.
通讯作者	Shaw, EA
来源期刊	SOIL SYSTEMS
EISSN	2571-8789
出版年	2019
卷号	3 期号:3
英文摘要	Biotic interactions structure ecological communities but abiotic factors affect the strength of these relationships. These interactions are difficult to study in soils due to their vast biodiversity and the many environmental factors that affect soil species. The McMurdo Dry Valleys (MDV), Antarctica, are relatively simple soil ecosystems compared to temperate soils, making them an excellent study system for the trophic relationships of soil. Soil microbes and relatively few species of nematodes, rotifers, tardigrades, springtails, and mites are patchily distributed across the cold, dry landscape, which lacks vascular plants and terrestrial vertebrates. However, glacier and permafrost melt are expected to cause shifts in soil moisture and solutes across this ecosystem. To test how increased moisture and salinity affect soil invertebrates and their biotic interactions, we established a laboratory microcosm experiment (4 community x 2 moisture x 2 salinity treatments). Community treatments were: (1) Bacteria only (control), (2) Scottnema (S. lindsayae + bacteria), (3) Eudorylaimus (E. antarcticus + bacteria), and (4) Mixed (S. lindsayae + E. antarcticus + bacteria). Salinity and moisture treatments were control and high. High moisture reduced S. lindsayae adults, while high salinity reduced the total S. lindsayae population. We found that S. lindsayae exerted top-down control over soil bacteria populations, but this effect was dependent on salinity treatment. In the high salinity treatment, bacteria were released from top-down pressure as S. lindsayae declined. Ours was the first study to empirically demonstrate, although in lab microcosm conditions, top-down control in the MDV soil food web.
英文关键词	nematode bacteria soil communities trophic interactions biological interactions polar desert top-down effects
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000492988900005
WOS关键词	MCMURDO DRY VALLEYS ; NEMATODE SCOTTNEMA-LINDSAYAE ; FREEZE-THAW CYCLES ; TAYLOR VALLEY ; POLAR DESERT ; TROPHIC INTERACTIONS ; NUTRIENT DYNAMICS ; AFFECT ENERGY ; ECOSYSTEM ; BIODIVERSITY
WOS类目	Soil Science
WOS研究方向	Agriculture
来源机构	Colorado State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333881
作者单位	[Shaw, E. Ashley; Wall, Diana H.] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA; [Wall, Diana H.] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA
推荐引用方式 GB/T 7714	Shaw, E. Ashley,Wall, Diana H.. Biotic Interactions in Experimental Antarctic Soil Microcosms Vary with Abiotic Stress[J]. Colorado State University,2019,3(3).
APA	Shaw, E. Ashley,&Wall, Diana H..(2019).Biotic Interactions in Experimental Antarctic Soil Microcosms Vary with Abiotic Stress.SOIL SYSTEMS,3(3).
MLA	Shaw, E. Ashley,et al."Biotic Interactions in Experimental Antarctic Soil Microcosms Vary with Abiotic Stress".SOIL SYSTEMS 3.3(2019).