Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau

Understanding the relationship between historical vegetation and bacteria is critical for disentangling spatiotemporal variations in microbial communities. However, the utility of historical vegetation as indicated by the reconstruction proxies like n-alkanes to explain microbial succession has been...

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Autores principales:	Haijun Yuan, Fanfan Meng, Masanobu Yamamoto, Xingqi Liu, Hailiang Dong, Ji Shen, Huaqun Yin, Jianjun Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Historical vegetation Lake sediment Microbial diversity Bacterial succession Tibetan Plateau n-Alkanes Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/5632ec88381544e19c1efbbb8736f025
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spelling	oai:doaj.org-article:5632ec88381544e19c1efbbb8736f0252021-12-01T04:49:45ZLinking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau1470-160X10.1016/j.ecolind.2021.107625https://doaj.org/article/5632ec88381544e19c1efbbb8736f0252021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21002909https://doaj.org/toc/1470-160XUnderstanding the relationship between historical vegetation and bacteria is critical for disentangling spatiotemporal variations in microbial communities. However, the utility of historical vegetation as indicated by the reconstruction proxies like n-alkanes to explain microbial succession has been understudied, especially regarding aquatic microbes living under contrasting climates. Here, we studied bacterial and n-alkane succession in sediment cores from Kusai Lake and Lugu Lake under contrasting climates, that is, the drier and colder climates and the warmer and wetter conditions, respectively, and further explored how bacterial communities are affected by historical vegetation. In both lakes, the Shannon diversity of bacteria and n-alkanes consistently and significantly (P < 0.05) decreased towards deep-depth sediments, and their compositional dissimilarity Bray-Curtis increased with depth changes, with slopes of 0.00048 and 0.00027 in Kusai and Lugu lakes, respectively. Furthermore, there was strong synchrony between bacteria and historical vegetation, which was underpinned by similar ecological processes such as environmental selection (e.g., climatic perturbations). Compared to Lugu Lake, however, both the Shannon diversity and compositions of bacteria or n-alkanes changed faster in Kusai Lake, which was influenced by abiotic factors such as the sediment Na and loss-on-ignition. Except for abiotic variables, we found that bacterial diversity and composition were also affected by n-alkane attributes such as the C27/C31, carbon preference index, Shannon diversity and composition in both lakes. In particular, n-alkane attributes generally exerted stronger effects on bacterial characteristics than abiotic variables. For example, n-alkane attributes showed strong direct effects on bacterial community composition, with path coefficients of 0.485 and 0.976 (P < 0.001) in Kusai and Lugu lakes, respectively, while abiotic variables had no direct effect. Thus, our findings provide new evidence that historical vegetation could substantially explain variations in bacterial communities across temporal scales.Haijun YuanFanfan MengMasanobu YamamotoXingqi LiuHailiang DongJi ShenHuaqun YinJianjun WangElsevierarticleHistorical vegetationLake sedimentMicrobial diversityBacterial successionTibetan Plateaun-AlkanesEcologyQH540-549.5ENEcological Indicators, Vol 126, Iss , Pp 107625- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Historical vegetation Lake sediment Microbial diversity Bacterial succession Tibetan Plateau n-Alkanes Ecology QH540-549.5
spellingShingle	Historical vegetation Lake sediment Microbial diversity Bacterial succession Tibetan Plateau n-Alkanes Ecology QH540-549.5 Haijun Yuan Fanfan Meng Masanobu Yamamoto Xingqi Liu Hailiang Dong Ji Shen Huaqun Yin Jianjun Wang Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau
description	Understanding the relationship between historical vegetation and bacteria is critical for disentangling spatiotemporal variations in microbial communities. However, the utility of historical vegetation as indicated by the reconstruction proxies like n-alkanes to explain microbial succession has been understudied, especially regarding aquatic microbes living under contrasting climates. Here, we studied bacterial and n-alkane succession in sediment cores from Kusai Lake and Lugu Lake under contrasting climates, that is, the drier and colder climates and the warmer and wetter conditions, respectively, and further explored how bacterial communities are affected by historical vegetation. In both lakes, the Shannon diversity of bacteria and n-alkanes consistently and significantly (P < 0.05) decreased towards deep-depth sediments, and their compositional dissimilarity Bray-Curtis increased with depth changes, with slopes of 0.00048 and 0.00027 in Kusai and Lugu lakes, respectively. Furthermore, there was strong synchrony between bacteria and historical vegetation, which was underpinned by similar ecological processes such as environmental selection (e.g., climatic perturbations). Compared to Lugu Lake, however, both the Shannon diversity and compositions of bacteria or n-alkanes changed faster in Kusai Lake, which was influenced by abiotic factors such as the sediment Na and loss-on-ignition. Except for abiotic variables, we found that bacterial diversity and composition were also affected by n-alkane attributes such as the C27/C31, carbon preference index, Shannon diversity and composition in both lakes. In particular, n-alkane attributes generally exerted stronger effects on bacterial characteristics than abiotic variables. For example, n-alkane attributes showed strong direct effects on bacterial community composition, with path coefficients of 0.485 and 0.976 (P < 0.001) in Kusai and Lugu lakes, respectively, while abiotic variables had no direct effect. Thus, our findings provide new evidence that historical vegetation could substantially explain variations in bacterial communities across temporal scales.
format	article
author	Haijun Yuan Fanfan Meng Masanobu Yamamoto Xingqi Liu Hailiang Dong Ji Shen Huaqun Yin Jianjun Wang
author_facet	Haijun Yuan Fanfan Meng Masanobu Yamamoto Xingqi Liu Hailiang Dong Ji Shen Huaqun Yin Jianjun Wang
author_sort	Haijun Yuan
title	Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau
title_short	Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau
title_full	Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau
title_fullStr	Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau
title_full_unstemmed	Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau
title_sort	linking historical vegetation to bacterial succession under the contrasting climates of the tibetan plateau
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/5632ec88381544e19c1efbbb8736f025
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Linking historical vegetation to bacterial succession under the contrasting climates of the Tibetan Plateau

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