Dynamic social interactions and keystone species shape the diversity and stability of mixed-species biofilms – an example from dairy isolates

Author:

Sadiq Faizan Ahmed1ORCID,De Reu Koen1,Steenackers Hans2ORCID,Van de Walle Ann1,Burmølle Mette3ORCID,Heyndrickx Marc14ORCID

Affiliation:

1. Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit , Brusselsesteenweg 370, 9090 Melle, Belgium

2. Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven , Kasteelpark Arenberg 20, 3001 Leuven, Belgium

3. Section of Microbiology, Department of Biology, University of Copenhagen , Universitetsparken 15, 2100 Copenhagen, Denmark

4. Ghent University, Department of Pathobiology, Pharmacology and Zoological Medicine , Salisburylaan 133, B-9820 Merelbeke, Belgium

Abstract

Abstract Identifying interspecies interactions in mixed-species biofilms is a key challenge in microbial ecology and is of paramount importance given that interactions govern community functionality and stability. We previously reported a bacterial four-species biofilm model comprising Stenotrophomonas rhizophila, Bacillus licheniformis, Microbacterium lacticum, and Calidifontibacter indicus that were isolated from the surface of a dairy pasteuriser after cleaning and disinfection. These bacteria produced 3.13-fold more biofilm mass compared to the sum of biofilm masses in monoculture. The present study confirms that the observed community synergy results from dynamic social interactions, encompassing commensalism, exploitation, and amensalism. M. lacticum appears to be the keystone species as it increased the growth of all other species that led to the synergy in biofilm mass. Interactions among the other three species (in the absence of M. lacticum) also contributed towards the synergy in biofilm mass. Biofilm inducing effects of bacterial cell-free-supernatants were observed for some combinations, revealing the nature of the observed synergy, and addition of additional species to dual-species combinations confirmed the presence of higher-order interactions within the biofilm community. Our findings provide understanding of bacterial interactions in biofilms which can be used as an interaction–mediated approach for cultivating, engineering, and designing synthetic bacterial communities.

Publisher

Oxford University Press (OUP)

Subject

General Medicine

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