Environment dependent microbial co‐occurrences across a cyanobacterial bloom in a freshwater lake

Abstract

Summary Microbial taxon–taxon co‐occurrences may directly or indirectly reflect the potential relationships between the members within a microbial community. However, to what extent and the specificity by which these co‐occurrences are influenced by environmental factors remains unclear. In this report, we evaluated how the dynamics of microbial taxon–taxon co‐occurrence is associated with the changes of environmental factors in Nan Lake at Wuhan city, China with a Modified Liquid Association method. We were able to detect more than 1000 taxon–taxon co‐occurrences highly correlated with one or more environmental factors across a phytoplankton bloom using 16S rRNA gene amplicon community profiles. These co‐occurrences, referred to as environment dependent co‐occurrences (ED_co‐occurrences), delineate a unique network in which a taxon–taxon pair exhibits specific, and potentially dynamic correlations with an environmental parameter, while the individual relative abundance of each may not. Microcystis involved ED_co‐occurrences are in important topological positions in the network, suggesting relationships between the bloom dominant species and other taxa could play a role in the interplay of microbial community and environment across various bloom stages. Our results may broaden our understanding of the response of a microbial community to the environment, particularly at the level of microbe–microbe associations.

Abundance and diversity of eukaryotic rather than bacterial community relate closely to the trophic level of urban lakes

“…Species replacement rather than richness difference displayed stronger effects on β-diversities of bacterial and eukaryotic communities, which is similar to prior findings for diatom community in Paran a River (Ruwer & Rodrigues, 2022) and microorganisms (i.e., bacteria and fungi) in a mountain system (Shen et al, 2020). Temperature affected network complexities of bacterial and eukaryotic communities, which is similar to an earlier study describing that co-occurrence network of planktonic bacteria is temperaturedependent in Lake Nanhu (Wu et al, 2021). We estimated environmental breadths and phylogenetic signals of planktonic bacteria and eukaryotes responding to 14 physicochemical factors, which is unlike studies reporting environmental breadths and phylogenetic signals are mainly used for specific environmental factor and microbial sub-communities (e.g., rare vs. abundant and specialist vs. generalist) (LeBrun et al, 2018;Yan et al, 2022).…”

Isolation and characterization of algicidal bacteria from freshwater aquatic environments in China

“…First, bacterial survival can be greatly affected by environmental growth conditions ( Ramos et al, 2001 ), such as nutrient and temperature, which can lead to insufficient cell concentrations for inhibiting algal growth. Second, the interactions between microorganisms within a microbial community may be highly complex and the native microorganisms may form negative interactions with the introduced algicidal bacteria, which may significantly attenuate the algal-lysing abilities ( Soda et al, 1998 ; Abreu and Taga, 2016 ; Wu et al, 2021 ). In addition, water bloom often consists of multiple phytoplankton species whose abundances may change seasonally ( Hedberg et al, 2020 ), their control may not be easily accomplished by the use of only one type of algicidal bacterial strain.…”

Algicidal interaction between Paenibacillus polymyxa MEZ6 and microalgae

“…Their relationships may change or shift from one type to the opposite type (e.g. from mutualistic to pathogenic) when growth stages or environmental conditions change (Mayers et al, 2016; Seyedsayamdost et al, 2011; Wu et al, 2021).…”