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Effects of multiple dimensions of bacterial diversity on functioning, stability and multifunctionality

Journal article
Authors Fabian Roger
S. Bertilsson
S. Langenheder
O. A. Osman
Lars Gamfeldt
Published in Ecology
Volume 97
Issue 10
Pages 2716-2728
ISSN 0012-9658
Publication year 2016
Published at Department of marine sciences
Pages 2716-2728
Language en
Links dx.doi.org/10.1002/ecy.1518
https://gup.ub.gu.se/file/206712
Keywords biodiversity and ecosystem functioning, biodiversity loss, biodiversity metrics, freshwater, functional, MICROBIAL COMMUNITY STRUCTURE, RARE SOIL MICROBES, PHYLOGENETIC, DIVERSITY, SPECIES RICHNESS, BIODIVERSITY, PRODUCTIVITY, POPULATIONS, BIOSPHERE, DEPLETION, DILUTION
Subject categories Marine ecology

Abstract

Bacteria are essential for many ecosystem services but our understanding of factors controlling their functioning is incomplete. While biodiversity has been identified as an important driver of ecosystem processes in macrobiotic communities, we know much less about bacterial communities. Due to the high diversity of bacterial communities, high functional redundancy is commonly proposed as explanation for a lack of clear effects of diversity. The generality of this claim has, however, been questioned. We present the results of an outdoor dilution-to-extinction experiment with four lake bacterial communities. The consequences of changes in bacterial diversity in terms of effective number of species, phylogenetic diversity, and functional diversity were studied for (1) bacterial abundance, (2) temporal stability of abundance, (3) nitrogen concentration, and (4) multifunctionality. We observed a richness gradient ranging from 15 to 280 operational taxonomic units (OTUs). Individual relationships between diversity and functioning ranged from negative to positive depending on lake, diversity dimension, and aspect of functioning. Only between phylogenetic diversity and abundance did we find a statistically consistent positive relationship across lakes. A literature review of 24 peer-reviewed studies that used dilution-to-extinction to manipulate bacterial diversity corroborated our findings: about 25% found positive relationships. Combined, these results suggest that bacteria-driven community functioning is relatively resistant to reductions in diversity.

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