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Responses of soil hexapod communities to warming are mediated by microbial carbon and nitrogen in a subarctic grassland
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International audience. Warming in subarctic ecosystems will be two-fold higher compared to lower latitudes under current climatechange projections. While the effects of warming in northern ecosystems on plants and microorganisms havebeen extensively studied, the responses of soil fauna have received much less attention, despite their importantrole in regulating key soil processes. We analyzed the response of soil hexapod communities in a subarcticgrassland exposed to a natural geothermal gradient in Iceland with increases of +3 and + 6 ◦C above ambienttemperature. We characterized hexapod communities using environmental DNA (eDNA) metabarcoding. Weanalyzed the amounts of microbial carbon (Cmic), microbial N (Nmic), dissolved organic C (DOC) and dissolvedorganic N (DON) and then assessed whether these variables could help to account for the compositionaldissimilarity of ground hexapod communities across temperatures. The increases in soil temperature did lead tochanges in the composition of hexapod communities. The compositional differences caused by +6 ◦C plots werecorrelated with a decrease in Cmic and Nmic, soil DOC and DON. Our results highlight the response of soilhexapods to warming, and their interaction with microbial biomass ultimately correlated with changes in theavailabilities of soil C and N.
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