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Trophic complexity in aqueous systems: bacterial species richness and protistan predation regulate dissolved organic carbon and dissolved total nitrogen removal
Stockholm University, Faculty of Science, Stockholm Resilience Centre. Helmholtz Centre for Environmental Research - UFZ, Germany.ORCID iD: 0000-0001-7335-5679
Number of Authors: 42016 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 283, no 1825, article id 20152724Article in journal (Refereed) Published
Abstract [en]

Loading of water bodies with dissolved organic carbon (DOC) and dissolved total nitrogen (DTN) affects their integrity and functioning. Microbial interactions mitigate the negative effects of high nutrient loads in these ecosystems. Despite numerous studies on how biodiversity mediates ecosystem functions, whether and how diversity and complexity of microbial food webs (horizontal, vertical) and the underlying ecological mechanisms influence nutrient removal has barely been investigated. Using microbial microcosms accommodating systematic combinations of prey (bacteria) and predator (protists) species, we showed that increasing bacterial richness improved the extent and reliability of DOC and DTN removal. Bacterial diversity drove nutrient removal either due to species foraging physiology or functional redundancy, whereas protistan diversity affected nutrient removal through bacterial prey resource partitioning and changing nutrient balance in the system. Our results demonstrate that prey predator diversity and trophic interactions interactively determine nutrient contents, thus implying the vital role of microbial trophic complexity as a biological buffer against DOC and DTN.

Place, publisher, year, edition, pages
2016. Vol. 283, no 1825, article id 20152724
Keywords [en]
biodiversity and ecosystem functioning, predator - prey interactions, nutrient removal, microbial model systems, trophic complexity and stability
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-168096DOI: 10.1098/rspb.2015.2724ISI: 000374207800014PubMedID: 26888033OAI: oai:DiVA.org:su-168096DiVA, id: diva2:1305647
Available from: 2019-04-17 Created: 2019-04-17 Last updated: 2019-04-17Bibliographically approved

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Fetzer, IngoHarms, HaukeChatzinotas, Antonis
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