Keystone predatory protists are associated closely with ammonia‐oxidizing microorganisms in an acidic Ultisol

Author:

Lin Yongxin12ORCID,Ye Guiping3,Hu Hang‐Wei4,Ding Weixin2,Fan Jianbo2,He Zi‐Yang4,He Ji‐Zheng14ORCID

Affiliation:

1. Fujian Provincial Key Laboratory for Subtropical Resources and Environment Fujian Normal University Fuzhou China

2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science Chinese Academy of Sciences Nanjing China

3. Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography Minjiang University Fuzhou China

4. School of Agriculture and Food, Faculty of Science The University of Melbourne Victoria Australia

Abstract

AbstractPredatory protists are widely recognized as critical biotic forces driving soil microbial communities, but their top‐down controls on ammonia‐oxidizing microorganisms (AOMs), the major players in nitrification, are largely unresolved. Here, we investigated the communities of predatory protists and their associations with AOMs using high‐throughput sequencing and network analysis in soil aggregates following various long‐term organic substitutions. We found that organic substitutions increased while soil aggregation decreased the alpha diversity of predatory protists. Predatory protistan communities were significantly associated with AOMs. Variosea, an important group of Amoebozoa, were the keystone predatory protists associated with the AOMs. Collectively, our findings highlight the importance of predatory protists, especially Variosea, in regulating the communities of AOMs in an acidic Ultsisol, with implications for managing nitrification by predatory protists in agricultural soils.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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