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

Research output: Contribution to journalArticle

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 func-tional 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, diversi-ty 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.

Details

Authors
  • Fabian Roger
  • Stefan Bertilsson
  • Silke Langenheder
  • Omneya Ahmed Osman
  • Lars Gamfeldt
External organisations
  • University of Gothenburg
Research areas and keywords

Keywords

  • biodiversity and ecosystem functioning, biodiversity loss, biodiversity metrics, freshwater, functional redundancy, microbial diversity, microcosm, rare biosphere
Original languageEnglish
Pages (from-to)2716-2728
JournalEcology
Volume97
Issue number10
Publication statusPublished - 2016 Oct 1
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes