气候变化领域集成服务门户(CCPortal): Trophic positions of soil microarthropods in forests increase with elevation, but energy channels remain unchanged

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DOI	10.1002/ecs2.4747
	Trophic positions of soil microarthropods in forests increase with elevation, but energy channels remain unchanged
	Lux, Johannes; Xie, Zhijing; Sun, Xin; Wu, Donghui; Pollierer, Melanie M.; Scheu, Stefan
发表日期	2024
ISSN	2150-8925
起始页码	15
结束页码	1
卷号	15 期号:1
英文摘要	Mountain forests are at risk as the consequences of climate change will likely lead to altered tree species boundaries. Characterizing food webs along elevation gradients in primary forests may help to predict the potential consequences of such changes, for example with regard to the decomposition of dead organic matter. Here, for the first time, we studied trophic variations in two species-rich microarthropod taxa, Collembola and Oribatida, along an elevation gradient of primary forest at Changbai Mountain, China. Samples were taken at seven elevations of 150-m elevational difference between 800 and 1700 m. At each elevation, Collembola and Oribatida were extracted from litter samples of eight subplots. We applied three state-of-the-art methods to elucidate trophic positions and basal resource use at community level: Bulk stable isotope analysis of nitrogen (Delta 15Nbulk) and carbon (Delta 13Cbulk), compound-specific stable isotope analysis of amino acids (CSIA-AA), and dietary routing of neutral lipid fatty acids (NLFAs). Trophic positions calculated using Delta 15Nbulk and CSIA-AA (TPCSIA) in both taxa increased similarly with elevation by about half and one third of a trophic position, respectively. Stable isotope mixing models and linear discriminant analysis bootstrapping using delta 13C of essential amino acids indicated fungi as the most important resource at all elevations for both taxa. Also, proportions of marker NLFAs changed little across elevations in both taxa; overall high proportions of linoleic acid indicated high fungal contributions, but in Collembola the contribution of bacterial markers was generally higher than in Oribatida. Delta 13Cbulk did not respond linearly to the elevation gradient; however, changes in elevation differed between Collembola and Oribatida. A strong linear relationship between delta 15N of phenylalanine and delta 15N of litter indicated litter as the basis of energy channels in both taxa. Overall, food web functioning likely changes with changing forest types along elevation gradients, with microarthropods switching from feeding closer to the base of the food web at lower elevations to feeding at higher trophic levels at higher elevations, potentially compromising their role in litter decomposition and nutrient cycling.
英文关键词	amino acids; Collembola; decomposition; elevation; NLFA; Oribatida; soil food web; stable isotopes
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001145927700001
来源期刊	ECOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305370
作者单位	University of Gottingen; Chinese Academy of Sciences; Northeast Institute of Geography & Agroecology, CAS; Northeast Normal University - China; Chinese Academy of Sciences; Institute of Urban Environment, CAS; Northeast Normal University - China; University of Gottingen
推荐引用方式 GB/T 7714	Lux, Johannes,Xie, Zhijing,Sun, Xin,et al. Trophic positions of soil microarthropods in forests increase with elevation, but energy channels remain unchanged[J],2024,15(1).
APA	Lux, Johannes,Xie, Zhijing,Sun, Xin,Wu, Donghui,Pollierer, Melanie M.,&Scheu, Stefan.(2024).Trophic positions of soil microarthropods in forests increase with elevation, but energy channels remain unchanged.ECOSPHERE,15(1).
MLA	Lux, Johannes,et al."Trophic positions of soil microarthropods in forests increase with elevation, but energy channels remain unchanged".ECOSPHERE 15.1(2024).