Decreasing diversity of rare bacterial subcommunities relates to dissolved organic matter along permafrost thawing gradients

Lei Zhou; Yongqiang Zhou; Xiaolong Yao; Jian Cai; Xin Liu; Xiangming Tang; Yunlin Zhang; Kyoung Soon Jang; Erik Jeppesen

doi:10.1016/j.envint.2019.105330

Decreasing diversity of rare bacterial subcommunities relates to dissolved organic matter along permafrost thawing gradients

Lei Zhou, Yongqiang Zhou, Xiaolong Yao, Jian Cai, Xin Liu, Xiangming Tang, Yunlin Zhang^*, Kyoung Soon Jang, Erik Jeppesen

^*Corresponding author for this work

Arctic Research Centre - Arctic Research Center, ECOS Water

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

56 Citations (Scopus)

Abstract

Dissolved organic matter (DOM) released from permafrost thaw greatly influences the biogeochemical cycles of, among others, downstream carbon, nitrogen and phosphorus cycles; yet, knowledge of the linkages between bacterial communities with permafrost DOM heterogeneity is limited. Here, we aim at unravelling the responses of bacterial diversities and metabolic profiles to DOM quantity and composition across permafrost thawing gradients by coupling an extensive field investigation with bio-incubation experiments. Richness, evenness and dissimilarities of the whole and rare communities decreased from thermokarst pits to headstreams and to downstream rivers. The assemblages of the abundant subcommunities were mainly determined by ecological drift-driven stochastic processes. Both the optical and the molecular composition of DOM were significantly related to the changes of the whole (rare) bacterial communities (Mantel's correlation > 0.5, p < 0.01). Diversity indices of the whole and rare communities decreased with decreasing relative abundance of tannins, condensed aromatics and more aromatic and oxidized lignins as well as with decreased dissolved organic carbon and intensities of all fluorescence components. Laboratory DOM bio-incubation experiments further confirmed microbial consumption of more aromatic and oxidized compounds as well as decreasing metabolic diversities in terms of microbial degradation and production along permafrost thawing gradients. Our findings suggest that changes in the sources of permafrost-derived DOM induced by global warming can have different influences on the diversity and metabolism of bacterial communities and thus on permafrost carbon climate feedbacks along permafrost thawing gradients.

Original language	English
Article number	105330
Journal	Environment International
Volume	134
ISSN	0160-4120
DOIs	https://doi.org/10.1016/j.envint.2019.105330
Publication status	Published - 1 Jan 2020

Keywords

Bacterial diversity
Co-occurrence networks
Dissolved organic matter
Microbial metabolism
Permafrost thawing
Ultrahigh-resolution mass spectrometry

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10.1016/j.envint.2019.105330Licence: CC BY-NC-ND

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title = "Decreasing diversity of rare bacterial subcommunities relates to dissolved organic matter along permafrost thawing gradients",

abstract = "Dissolved organic matter (DOM) released from permafrost thaw greatly influences the biogeochemical cycles of, among others, downstream carbon, nitrogen and phosphorus cycles; yet, knowledge of the linkages between bacterial communities with permafrost DOM heterogeneity is limited. Here, we aim at unravelling the responses of bacterial diversities and metabolic profiles to DOM quantity and composition across permafrost thawing gradients by coupling an extensive field investigation with bio-incubation experiments. Richness, evenness and dissimilarities of the whole and rare communities decreased from thermokarst pits to headstreams and to downstream rivers. The assemblages of the abundant subcommunities were mainly determined by ecological drift-driven stochastic processes. Both the optical and the molecular composition of DOM were significantly related to the changes of the whole (rare) bacterial communities (Mantel's correlation > 0.5, p < 0.01). Diversity indices of the whole and rare communities decreased with decreasing relative abundance of tannins, condensed aromatics and more aromatic and oxidized lignins as well as with decreased dissolved organic carbon and intensities of all fluorescence components. Laboratory DOM bio-incubation experiments further confirmed microbial consumption of more aromatic and oxidized compounds as well as decreasing metabolic diversities in terms of microbial degradation and production along permafrost thawing gradients. Our findings suggest that changes in the sources of permafrost-derived DOM induced by global warming can have different influences on the diversity and metabolism of bacterial communities and thus on permafrost carbon climate feedbacks along permafrost thawing gradients.",

keywords = "Bacterial diversity, Co-occurrence networks, Dissolved organic matter, Microbial metabolism, Permafrost thawing, Ultrahigh-resolution mass spectrometry",

author = "Lei Zhou and Yongqiang Zhou and Xiaolong Yao and Jian Cai and Xin Liu and Xiangming Tang and Yunlin Zhang and Jang, {Kyoung Soon} and Erik Jeppesen",

year = "2020",

month = jan,

day = "1",

doi = "10.1016/j.envint.2019.105330",

language = "English",

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journal = "Environment International",

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Decreasing diversity of rare bacterial subcommunities relates to dissolved organic matter along permafrost thawing gradients. / Zhou, Lei; Zhou, Yongqiang; Yao, Xiaolong et al.
In: Environment International, Vol. 134, 105330, 01.01.2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Decreasing diversity of rare bacterial subcommunities relates to dissolved organic matter along permafrost thawing gradients

AU - Zhou, Lei

AU - Zhou, Yongqiang

AU - Yao, Xiaolong

AU - Cai, Jian

AU - Liu, Xin

AU - Tang, Xiangming

AU - Zhang, Yunlin

AU - Jang, Kyoung Soon

AU - Jeppesen, Erik

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Dissolved organic matter (DOM) released from permafrost thaw greatly influences the biogeochemical cycles of, among others, downstream carbon, nitrogen and phosphorus cycles; yet, knowledge of the linkages between bacterial communities with permafrost DOM heterogeneity is limited. Here, we aim at unravelling the responses of bacterial diversities and metabolic profiles to DOM quantity and composition across permafrost thawing gradients by coupling an extensive field investigation with bio-incubation experiments. Richness, evenness and dissimilarities of the whole and rare communities decreased from thermokarst pits to headstreams and to downstream rivers. The assemblages of the abundant subcommunities were mainly determined by ecological drift-driven stochastic processes. Both the optical and the molecular composition of DOM were significantly related to the changes of the whole (rare) bacterial communities (Mantel's correlation > 0.5, p < 0.01). Diversity indices of the whole and rare communities decreased with decreasing relative abundance of tannins, condensed aromatics and more aromatic and oxidized lignins as well as with decreased dissolved organic carbon and intensities of all fluorescence components. Laboratory DOM bio-incubation experiments further confirmed microbial consumption of more aromatic and oxidized compounds as well as decreasing metabolic diversities in terms of microbial degradation and production along permafrost thawing gradients. Our findings suggest that changes in the sources of permafrost-derived DOM induced by global warming can have different influences on the diversity and metabolism of bacterial communities and thus on permafrost carbon climate feedbacks along permafrost thawing gradients.

AB - Dissolved organic matter (DOM) released from permafrost thaw greatly influences the biogeochemical cycles of, among others, downstream carbon, nitrogen and phosphorus cycles; yet, knowledge of the linkages between bacterial communities with permafrost DOM heterogeneity is limited. Here, we aim at unravelling the responses of bacterial diversities and metabolic profiles to DOM quantity and composition across permafrost thawing gradients by coupling an extensive field investigation with bio-incubation experiments. Richness, evenness and dissimilarities of the whole and rare communities decreased from thermokarst pits to headstreams and to downstream rivers. The assemblages of the abundant subcommunities were mainly determined by ecological drift-driven stochastic processes. Both the optical and the molecular composition of DOM were significantly related to the changes of the whole (rare) bacterial communities (Mantel's correlation > 0.5, p < 0.01). Diversity indices of the whole and rare communities decreased with decreasing relative abundance of tannins, condensed aromatics and more aromatic and oxidized lignins as well as with decreased dissolved organic carbon and intensities of all fluorescence components. Laboratory DOM bio-incubation experiments further confirmed microbial consumption of more aromatic and oxidized compounds as well as decreasing metabolic diversities in terms of microbial degradation and production along permafrost thawing gradients. Our findings suggest that changes in the sources of permafrost-derived DOM induced by global warming can have different influences on the diversity and metabolism of bacterial communities and thus on permafrost carbon climate feedbacks along permafrost thawing gradients.

KW - Bacterial diversity

KW - Co-occurrence networks

KW - Dissolved organic matter

KW - Microbial metabolism

KW - Permafrost thawing

KW - Ultrahigh-resolution mass spectrometry

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U2 - 10.1016/j.envint.2019.105330

DO - 10.1016/j.envint.2019.105330

M3 - Journal article

C2 - 31759274

AN - SCOPUS:85075040623

SN - 0160-4120

VL - 134

JO - Environment International

JF - Environment International

M1 - 105330

ER -

Decreasing diversity of rare bacterial subcommunities relates to dissolved organic matter along permafrost thawing gradients

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