Organic matter from melting Arctic sea ice triggers bacterioplankton activity and diversity ...
As Arctic multiyear ice is being replaced with first-year sea ice, a key question pertains to the cycling and fate of the increasingly dominant first-year ice carbon upon its release into the water column during melt. In this study, we experimentally tested the hypothesis that changes in sea ice dis...
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| Format: | Dataset |
| Language: | English |
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MGnify
2019
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| Online Access: | https://dx.doi.org/10.15468/apu8kr https://www.gbif.org/dataset/7b1bbce6-6a69-4f7d-b611-79f070d7964e |
| Summary: | As Arctic multiyear ice is being replaced with first-year sea ice, a key question pertains to the cycling and fate of the increasingly dominant first-year ice carbon upon its release into the water column during melt. In this study, we experimentally tested the hypothesis that changes in sea ice dissolved organic matter (DOM) fractions affect the response of under-ice microbial communities and, as a corollary, the cycling of sea ice carbon in surface waters.Size-fractionated DOM fractions were isolated from first-year ice, producing three pools of dissolved organic carbon comprising the full DOM spectrum, large exopolymeric substances (EPS > 100 KDa molecular weight), and small EPS (< 100 KDa and > 10 KDa molecular weight). Enrichment experiments with these fractions revealed, over a 216 h period, significant and contrasting changes in prokaryotic abundance and production, substrate utilization rates, and microbial diversity between enrichments. The different DOM fractions differed in terms of ... |
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